Split up TinyProtocol and its built-in reflection system.
Dieser Commit ist enthalten in:
Kristian S. Stangeland
Ursprung
96cc518fb0
Commit
752807fa5f
@ -4,20 +4,20 @@ import org.bukkit.Location;
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import org.bukkit.entity.Player;
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import org.bukkit.entity.Player;
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import org.bukkit.plugin.java.JavaPlugin;
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import org.bukkit.plugin.java.JavaPlugin;
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import com.comphenix.tinyprotocol.TinyProtocol.FieldAccessor;
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import com.comphenix.tinyprotocol.Reflection.FieldAccessor;
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public class ExamplePlugin extends JavaPlugin {
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public class ExamplePlugin extends JavaPlugin {
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// Chat packets
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// Chat packets
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private FieldAccessor<String> CHAT_MESSAGE = TinyProtocol.getField(
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private FieldAccessor<String> CHAT_MESSAGE = Reflection.getField(
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"PacketPlayInChat", String.class, 0);
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"{nms}.PacketPlayInChat", String.class, 0);
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// Explosion packet
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// Explosion packet
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private Class<?> particleClass = TinyProtocol.getMinecraftClass("PacketPlayOutWorldParticles");
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private Class<?> particleClass = Reflection.getClass("{nms}.PacketPlayOutWorldParticles");
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private FieldAccessor<String> particleName = TinyProtocol.getField(particleClass, String.class, 0);
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private FieldAccessor<String> particleName = Reflection.getField(particleClass, String.class, 0);
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private FieldAccessor<Float> particleX = TinyProtocol.getField(particleClass, float.class, 0);
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private FieldAccessor<Float> particleX = Reflection.getField(particleClass, float.class, 0);
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private FieldAccessor<Float> particleY = TinyProtocol.getField(particleClass, float.class, 1);
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private FieldAccessor<Float> particleY = Reflection.getField(particleClass, float.class, 1);
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private FieldAccessor<Float> particleZ = TinyProtocol.getField(particleClass, float.class, 2);
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private FieldAccessor<Float> particleZ = Reflection.getField(particleClass, float.class, 2);
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private FieldAccessor<Integer> particleCount = TinyProtocol.getField(particleClass, int.class, 0);
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private FieldAccessor<Integer> particleCount = Reflection.getField(particleClass, int.class, 0);
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private TinyProtocol protocol;
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private TinyProtocol protocol;
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@ -0,0 +1,294 @@
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package com.comphenix.tinyprotocol;
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import java.lang.reflect.Field;
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import java.lang.reflect.Method;
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import java.util.Arrays;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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import org.bukkit.Bukkit;
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/**
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* An utility class that simplifies reflection in Bukkit plugins.
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* @author Kristian
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*/
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public final class Reflection {
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/**
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* An interface for invoking a specific method.
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*/
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public interface MethodInvoker {
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/**
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* Invoke a method on a specific target object.
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* @param target - the target object, or NULL for a static method.
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* @param arguments - the arguments to pass to the method.
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* @return The return value, or NULL if is void.
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*/
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public Object invoke(Object target, Object... arguments);
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}
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/**
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* An interface for retrieving the field content.
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* @param <T> - field type.
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*/
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public interface FieldAccessor<T> {
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/**
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* Retrieve the content of a field.
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* @param target - the target object, or NULL for a static field.
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* @return The value of the field.
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*/
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public T get(Object target);
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/**
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* Set the content of a field.
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* @param target - the target object, or NULL for a static field.
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* @param value - the new value of the field.
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*/
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public void set(Object target, Object value);
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/**
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* Determine if the given object has this field.
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* @param target - the object to test.
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* @return TRUE if it does, FALSE otherwise.
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*/
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public boolean hasField(Object target);
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}
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// Deduce the net.minecraft.server.v* package
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private static String OBC_PREFIX = Bukkit.getServer().getClass().getPackage().getName();
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private static String NMS_PREFIX = OBC_PREFIX.replace("org.bukkit.craftbukkit", "net.minecraft.server");
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private static String VERSION = OBC_PREFIX.replace("org.bukkit.craftbukkit", "").replace(".", "");
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// Variable replacement
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private static Pattern MATCH_VARIABLE = Pattern.compile("\\{([^\\}]+)\\}");
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private Reflection() {
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// Seal class
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}
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/**
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* Retrieve a field accessor for a specific field type and name.
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* @param target - the target type.
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* @param name - the name of the field, or NULL to ignore.
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* @param fieldType - a compatible field type.
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* @return The field accessor.
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*/
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public static <T> FieldAccessor<T> getField(Class<?> target, String name, Class<T> fieldType) {
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return getField(target, name, fieldType, 0);
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}
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/**
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* Retrieve a field accessor for a specific field type and name.
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* @param className - lookup name of the class, see {@link #getClass(String)}.
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* @param name - the name of the field, or NULL to ignore.
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* @param fieldType - a compatible field type.
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* @return The field accessor.
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*/
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public static <T> FieldAccessor<T> getField(String className, String name, Class<T> fieldType) {
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return getField(getClass(className), name, fieldType, 0);
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}
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/**
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* Retrieve a field accessor for a specific field type and name.
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* @param target - the target type.
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* @param fieldType - a compatible field type.
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* @param index - the number of compatible fields to skip.
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* @return The field accessor.
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*/
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public static <T> FieldAccessor<T> getField(Class<?> target, Class<T> fieldType, int index) {
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return getField(target, null, fieldType, index);
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}
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/**
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* Retrieve a field accessor for a specific field type and name.
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* @param className - lookup name of the class, see {@link #getClass(String)}.
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* @param fieldType - a compatible field type.
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* @param index - the number of compatible fields to skip.
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* @return The field accessor.
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*/
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public static <T> FieldAccessor<T> getField(String className, Class<T> fieldType, int index) {
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return getField(getClass(className), fieldType, index);
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}
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// Common method
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private static <T> FieldAccessor<T> getField(Class<?> target, String name, Class<T> fieldType, int index) {
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for (final Field field : target.getDeclaredFields()) {
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if ((name == null || field.getName().equals(name)) &&
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fieldType.isAssignableFrom(field.getType()) && index-- <= 0) {
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field.setAccessible(true);
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// A function for retrieving a specific field value
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return new FieldAccessor<T>() {
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@SuppressWarnings("unchecked")
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@Override
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public T get(Object target) {
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try {
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return (T) field.get(target);
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} catch (IllegalAccessException e) {
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throw new RuntimeException("Cannot access reflection.", e);
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}
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}
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@Override
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public void set(Object target, Object value) {
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try {
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field.set(target, value);
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} catch (IllegalAccessException e) {
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throw new RuntimeException("Cannot access reflection.", e);
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}
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}
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@Override
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public boolean hasField(Object target) {
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// target instanceof DeclaringClass
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return field.getDeclaringClass().isAssignableFrom(target.getClass());
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}
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};
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}
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}
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// Search in parent classes
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if (target.getSuperclass() != null)
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return getField(target.getSuperclass(), name, fieldType, index);
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throw new IllegalArgumentException("Cannot find field with type " + fieldType);
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}
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/**
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* Search for the first publically and privately defined method of the given name and parameter count.
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* @param className - lookup name of the class, see {@link #getClass(String)}.
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* @param methodName - the method name, or NULL to skip.
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* @param params - the expected parameters.
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* @return An object that invokes this specific method.
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* @throws IllegalStateException If we cannot find this method.
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*/
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public static MethodInvoker getMethod(String className, String methodName, Class<?>... params) {
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return getMethod(getClass(className), methodName, params);
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}
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/**
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* Search for the first publically and privately defined method of the given name and parameter count.
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* @param clazz - a class to start with.
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* @param methodName - the method name, or NULL to skip.
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* @param params - the expected parameters.
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* @return An object that invokes this specific method.
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* @throws IllegalStateException If we cannot find this method.
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*/
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public static MethodInvoker getMethod(Class<?> clazz, String methodName, Class<?>... params) {
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for (final Method method : clazz.getDeclaredMethods()) {
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if ((methodName == null || method.getName().equals(methodName)) &&
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Arrays.equals(method.getParameterTypes(), params)) {
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method.setAccessible(true);
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return new MethodInvoker() {
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@Override
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public Object invoke(Object target, Object... arguments) {
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try {
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return method.invoke(target, arguments);
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} catch (Exception e) {
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throw new RuntimeException("Cannot invoke method " + method, e);
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}
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}
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};
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}
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}
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// Search in every superclass
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if (clazz.getSuperclass() != null)
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return getMethod(clazz.getSuperclass(), methodName, params);
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throw new IllegalStateException(String.format(
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"Unable to find method %s (%s).", methodName, Arrays.asList(params)));
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}
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/**
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* Retrieve a class from its full name.
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* <p>
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* Strings enclosed with curly brackets - such as {TEXT} - will be replaced according
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* to the following table:
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* <p>
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* <table border="1">
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* <tr>
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* <th>Variable</th>
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* <th>Content</th>
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* </tr>
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* <tr>
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* <td>{nms}</td>
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* <td>Actual package name of net.minecraft.server.VERSION</td>
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* </tr>
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* <tr>
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* <td>{obc}</td>
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* <td>Actual pacakge name of org.bukkit.craftbukkit.VERSION</td>
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* </tr>
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* <tr>
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* <td>{version}</td>
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* <td>The current Minecraft package VERSION, if any.</td>
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* </tr>
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* </table>
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* @param lookupName - the class name with variables.
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* @return The looked up class.
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* @throws IllegalArgumentException If a variable or class could not be found.
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*/
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public static Class<?> getClass(String lookupName) {
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return getCanonicalClass(expandVariables(lookupName));
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}
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/**
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* Retrieve a class in the net.minecraft.server.VERSION.* package.
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* @param name - the name of the class, excluding the package.
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* @throws IllegalArgumentException If the class doesn't exist.
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*/
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public static Class<?> getMinecraftClass(String name) {
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return getCanonicalClass(NMS_PREFIX + "." + name);
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}
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/**
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* Retrieve a class in the org.bukkit.craftbukkit.VERSION.* package.
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* @param name - the name of the class, excluding the package.
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* @throws IllegalArgumentException If the class doesn't exist.
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*/
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public static Class<?> getCraftBukkitClass(String name) {
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return getCanonicalClass(OBC_PREFIX + "." + name);
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}
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/**
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* Retrieve a class by its canonical name.
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* @param canonicalName - the canonical name.
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* @return The class.
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*/
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private static Class<?> getCanonicalClass(String canonicalName) {
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try {
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return Class.forName(canonicalName);
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} catch (ClassNotFoundException e) {
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throw new IllegalArgumentException("Cannot find " + canonicalName, e);
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}
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}
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/**
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* Expand variables such as "{nms}" and "{obc}" to their corresponding packages.
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* @param name - the full name of the class.
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* @return The expanded string.
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*/
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private static String expandVariables(String name) {
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StringBuffer output = new StringBuffer();
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Matcher matcher = MATCH_VARIABLE.matcher(name);
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while (matcher.find()) {
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String variable = matcher.group(1);
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String replacement = "";
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// Expand all detected variables
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if ("nms".equalsIgnoreCase(variable))
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replacement = NMS_PREFIX;
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else if ("obc".equalsIgnoreCase(variable))
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replacement = OBC_PREFIX;
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else if ("version".equalsIgnoreCase(variable))
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replacement = VERSION;
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else
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throw new IllegalArgumentException("Unknown variable: " + variable);
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// Assume the expanded variables are all packages, and append a dot
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if (replacement.length() > 0 && matcher.end() < name.length() && name.charAt(matcher.end()) != '.')
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replacement += ".";
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matcher.appendReplacement(output, replacement);
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}
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matcher.appendTail(output);
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return output.toString();
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}
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}
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@ -1,8 +1,5 @@
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package com.comphenix.tinyprotocol;
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package com.comphenix.tinyprotocol;
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import java.lang.reflect.Field;
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import java.lang.reflect.Method;
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import java.util.Arrays;
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import java.util.Map;
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import java.util.Map;
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import java.util.logging.Level;
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import java.util.logging.Level;
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@ -12,44 +9,108 @@ import net.minecraft.util.io.netty.channel.ChannelDuplexHandler;
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import net.minecraft.util.io.netty.channel.ChannelHandlerContext;
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import net.minecraft.util.io.netty.channel.ChannelHandlerContext;
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import net.minecraft.util.io.netty.channel.ChannelPromise;
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import net.minecraft.util.io.netty.channel.ChannelPromise;
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import org.bukkit.Bukkit;
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import org.bukkit.entity.Player;
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import org.bukkit.entity.Player;
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import org.bukkit.event.EventHandler;
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import org.bukkit.event.EventHandler;
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import org.bukkit.event.EventPriority;
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import org.bukkit.event.EventPriority;
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import org.bukkit.event.HandlerList;
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import org.bukkit.event.Listener;
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import org.bukkit.event.Listener;
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import org.bukkit.event.player.PlayerJoinEvent;
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import org.bukkit.event.player.PlayerJoinEvent;
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import org.bukkit.event.server.PluginDisableEvent;
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import org.bukkit.event.server.PluginDisableEvent;
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import org.bukkit.plugin.Plugin;
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import org.bukkit.plugin.Plugin;
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|
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import com.comphenix.tinyprotocol.Reflection.FieldAccessor;
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import com.comphenix.tinyprotocol.Reflection.MethodInvoker;
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import com.google.common.collect.MapMaker;
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import com.google.common.collect.MapMaker;
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|
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public abstract class TinyProtocol implements Listener {
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/**
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// Deduce the net.minecraft.server.v* package
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* Represents a very tiny alternative to ProtocolLib in 1.7.2.
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private static String OBC_PREFIX = Bukkit.getServer().getClass().getPackage().getName();
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* <p>
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private static String NMS_PREFIX = OBC_PREFIX.replace("org.bukkit.craftbukkit", "net.minecraft.server");
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* Note that it does not support intercepting packets sent during login (such as OUT_SERVER_PING).
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|
* @author Kristian
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*/
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public abstract class TinyProtocol {
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// Used in order to lookup a channel
|
// Used in order to lookup a channel
|
||||||
private MethodInvoker getPlayerHandle = getMethod(getCraftBukkitClass("entity.CraftPlayer"), "getHandle");
|
private MethodInvoker getPlayerHandle = Reflection.getMethod("{obc}.entity.CraftPlayer", "getHandle");
|
||||||
private FieldAccessor<Object> getConnection = getField(getMinecraftClass("EntityPlayer"), "playerConnection", Object.class);
|
private FieldAccessor<Object> getConnection = Reflection.getField("{nms}.EntityPlayer", "playerConnection", Object.class);
|
||||||
private FieldAccessor<Object> getManager = getField(getMinecraftClass("PlayerConnection"), "networkManager", Object.class);
|
private FieldAccessor<Object> getManager = Reflection.getField("{nms}.PlayerConnection", "networkManager", Object.class);
|
||||||
private FieldAccessor<Channel> getChannel = getField(getMinecraftClass("NetworkManager"), Channel.class, 0);
|
private FieldAccessor<Channel> getChannel = Reflection.getField("{nms}.NetworkManager", Channel.class, 0);
|
||||||
|
|
||||||
// Speedup channel lookup
|
// Speedup channel lookup
|
||||||
private Map<Player, Channel> channelLookup = new MapMaker().weakKeys().makeMap();
|
private Map<Player, Channel> channelLookup = new MapMaker().weakKeys().makeMap();
|
||||||
|
private Listener listener;
|
||||||
|
|
||||||
private boolean closed;
|
protected boolean closed;
|
||||||
private Plugin plugin;
|
protected Plugin plugin;
|
||||||
|
|
||||||
public TinyProtocol(Plugin plugin) {
|
public TinyProtocol(Plugin plugin) {
|
||||||
this.plugin = plugin;
|
this.plugin = plugin;
|
||||||
this.plugin.getServer().getPluginManager().registerEvents(this, plugin);
|
this.plugin.getServer().getPluginManager().registerEvents(
|
||||||
|
listener = createListener(), plugin);
|
||||||
|
|
||||||
// Prepare existing players
|
// Prepare existing players
|
||||||
for (Player player : plugin.getServer().getOnlinePlayers()) {
|
for (Player player : plugin.getServer().getOnlinePlayers()) {
|
||||||
injectPlayer(player);
|
injectPlayer(player);
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Invoked when the server is starting to send a packet to a player.
|
||||||
|
* <p>
|
||||||
|
* Note that this is not executed on the main thread.
|
||||||
|
* @param reciever - the receiving player.
|
||||||
|
* @param packet - the packet being sent.
|
||||||
|
* @return The packet to send instead, or NULL to cancel the transmission.
|
||||||
|
*/
|
||||||
|
public Object onPacketOutAsync(Player reciever, Object packet) {
|
||||||
|
return packet;
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Invoked when the server has received a packet from a given player.
|
||||||
|
* @param sender - the player that sent the packet.
|
||||||
|
* @param packet - the packet being sent.
|
||||||
|
* @return The packet to recieve instead, or NULL to cancel.
|
||||||
|
*/
|
||||||
|
public Object onPacketInAsync(Player sender, Object packet) {
|
||||||
|
return packet;
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Send a packet to a particular player.
|
||||||
|
* <p>
|
||||||
|
* Note that {@link #onPacketOutAsync(Player, Object)} will be invoked with this packet.
|
||||||
|
* @param player - the destination player.
|
||||||
|
* @param packet - the packet to send.
|
||||||
|
*/
|
||||||
|
public void sendPacket(Player player, Object packet) {
|
||||||
|
getChannel(player).pipeline().writeAndFlush(packet);
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Pretend that a given packet has been received from a player.
|
||||||
|
* <p>
|
||||||
|
* Note that {@link #onPacketInAsync(Player, Object)} will be invoked with this packet.
|
||||||
|
* @param player - the player that sent the packet.
|
||||||
|
* @param packet - the packet that will be received by the server.
|
||||||
|
*/
|
||||||
|
public void receivePacket(Player player, Object packet) {
|
||||||
|
getChannel(player).pipeline().context("encoder").fireChannelRead(packet);
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Retrieve the name of the channel injector, default implementation is "tiny-" + plugin name.
|
||||||
|
* <p>
|
||||||
|
* Override this if you have multiple instances of TinyProtocol, and return a unique string per instance.
|
||||||
|
* @return A unique channel handler name.
|
||||||
|
*/
|
||||||
|
protected String getHandlerName() {
|
||||||
|
return "tiny-" + plugin.getName();
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Add a custom channel handler to the given player's channel pipeline, allowing us to intercept sent and received packets.
|
||||||
|
* @param player - the player to inject.
|
||||||
|
*/
|
||||||
private void injectPlayer(final Player player) {
|
private void injectPlayer(final Player player) {
|
||||||
// Inject our packet interceptor
|
// Inject our packet interceptor
|
||||||
getChannel(player).pipeline().addBefore("packet_handler", getHandlerName(), new ChannelDuplexHandler() {
|
getChannel(player).pipeline().addBefore("packet_handler", getHandlerName(), new ChannelDuplexHandler() {
|
||||||
@ -80,42 +141,6 @@ public abstract class TinyProtocol implements Listener {
|
|||||||
}
|
}
|
||||||
});
|
});
|
||||||
}
|
}
|
||||||
|
|
||||||
private String getHandlerName() {
|
|
||||||
return "tiny-" + plugin.getName();
|
|
||||||
}
|
|
||||||
|
|
||||||
@EventHandler(priority = EventPriority.LOWEST)
|
|
||||||
public final void onPlayerJoin(PlayerJoinEvent e) {
|
|
||||||
if (closed)
|
|
||||||
return;
|
|
||||||
injectPlayer(e.getPlayer());
|
|
||||||
}
|
|
||||||
|
|
||||||
@EventHandler
|
|
||||||
public final void onPluginDisable(PluginDisableEvent e) {
|
|
||||||
if (e.getPlugin().equals(plugin)) {
|
|
||||||
close();
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
/**
|
|
||||||
* Send a packet to a particular player.
|
|
||||||
* @param player - the destination player.
|
|
||||||
* @param packet - the packet to send.
|
|
||||||
*/
|
|
||||||
public void sendPacket(Player player, Object packet) {
|
|
||||||
getChannel(player).pipeline().writeAndFlush(packet);
|
|
||||||
}
|
|
||||||
|
|
||||||
/**
|
|
||||||
* Pretend that a given packet has been received from a player.
|
|
||||||
* @param player - the player that sent the packet.
|
|
||||||
* @param packet - the packet that will be received by the server.
|
|
||||||
*/
|
|
||||||
public void receivePacket(Player player, Object packet) {
|
|
||||||
getChannel(player).pipeline().context("encoder").fireChannelRead(packet);
|
|
||||||
}
|
|
||||||
|
|
||||||
/**
|
/**
|
||||||
* Retrieve the Netty channel associated with a player. This is cached.
|
* Retrieve the Netty channel associated with a player. This is cached.
|
||||||
@ -136,25 +161,24 @@ public abstract class TinyProtocol implements Listener {
|
|||||||
}
|
}
|
||||||
|
|
||||||
/**
|
/**
|
||||||
* Invoked when the server is starting to send a packet to a player.
|
* Create the Bukkit listener.
|
||||||
* <p>
|
|
||||||
* Note that this is not executed on the main thread.
|
|
||||||
* @param reciever - the receiving player.
|
|
||||||
* @param packet - the packet being sent.
|
|
||||||
* @return The packet to send instead, or NULL to cancel the transmission.
|
|
||||||
*/
|
*/
|
||||||
public Object onPacketOutAsync(Player reciever, Object packet) {
|
private Listener createListener() {
|
||||||
return packet;
|
return new Listener() {
|
||||||
}
|
@EventHandler(priority = EventPriority.LOWEST)
|
||||||
|
public final void onPlayerJoin(PlayerJoinEvent e) {
|
||||||
/**
|
if (closed)
|
||||||
* Invoked when the server has received a packet from a given player.
|
return;
|
||||||
* @param sender - the player that sent the packet.
|
injectPlayer(e.getPlayer());
|
||||||
* @param packet - the packet being sent.
|
}
|
||||||
* @return The packet to recieve instead, or NULL to cancel.
|
|
||||||
*/
|
@EventHandler
|
||||||
public Object onPacketInAsync(Player sender, Object packet) {
|
public final void onPluginDisable(PluginDisableEvent e) {
|
||||||
return packet;
|
if (e.getPlugin().equals(plugin)) {
|
||||||
|
close();
|
||||||
|
}
|
||||||
|
}
|
||||||
|
};
|
||||||
}
|
}
|
||||||
|
|
||||||
/**
|
/**
|
||||||
@ -168,181 +192,9 @@ public abstract class TinyProtocol implements Listener {
|
|||||||
for (Player player : plugin.getServer().getOnlinePlayers()) {
|
for (Player player : plugin.getServer().getOnlinePlayers()) {
|
||||||
getChannel(player).pipeline().remove(getHandlerName());
|
getChannel(player).pipeline().remove(getHandlerName());
|
||||||
}
|
}
|
||||||
|
|
||||||
|
// Clean up Bukkit
|
||||||
|
HandlerList.unregisterAll(listener);
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|
||||||
/**
|
|
||||||
* Retrieve a field accessor for a specific field type and name.
|
|
||||||
* @param target - the target type.
|
|
||||||
* @param name - the name of the field, or NULL to ignore.
|
|
||||||
* @param fieldType - a compatible field type.
|
|
||||||
* @return The field accessor.
|
|
||||||
*/
|
|
||||||
public static <T> FieldAccessor<T> getField(Class<?> target, String name, Class<T> fieldType) {
|
|
||||||
return getField(target, name, fieldType, 0);
|
|
||||||
}
|
|
||||||
|
|
||||||
/**
|
|
||||||
* Retrieve a field accessor for a specific field type and name.
|
|
||||||
* @param target - the target type.
|
|
||||||
* @param fieldType - a compatible field type.
|
|
||||||
* @param index - the number of compatible fields to skip.
|
|
||||||
* @return The field accessor.
|
|
||||||
*/
|
|
||||||
public static <T> FieldAccessor<T> getField(Class<?> target, Class<T> fieldType, int index) {
|
|
||||||
return getField(target, null, fieldType, index);
|
|
||||||
}
|
|
||||||
|
|
||||||
/**
|
|
||||||
* Retrieve a field accessor for a specific field type and name.
|
|
||||||
* @param nmsTargetClass - the net.minecraft.server class name.
|
|
||||||
* @param fieldType - a compatible field type.
|
|
||||||
* @param index - the number of compatible fields to skip.
|
|
||||||
* @return The field accessor.
|
|
||||||
*/
|
|
||||||
public static <T> FieldAccessor<T> getField(String nmsTargetClass, Class<T> fieldType, int index) {
|
|
||||||
return getField(getMinecraftClass(nmsTargetClass), fieldType, index);
|
|
||||||
}
|
|
||||||
|
|
||||||
// Common method
|
|
||||||
private static <T> FieldAccessor<T> getField(Class<?> target, String name, Class<T> fieldType, int index) {
|
|
||||||
for (final Field field : target.getDeclaredFields()) {
|
|
||||||
if ((name == null || field.getName().equals(name)) &&
|
|
||||||
fieldType.isAssignableFrom(field.getType()) && index-- <= 0) {
|
|
||||||
field.setAccessible(true);
|
|
||||||
|
|
||||||
// A function for retrieving a specific field value
|
|
||||||
return new FieldAccessor<T>() {
|
|
||||||
@SuppressWarnings("unchecked")
|
|
||||||
@Override
|
|
||||||
public T get(Object target) {
|
|
||||||
try {
|
|
||||||
return (T) field.get(target);
|
|
||||||
} catch (IllegalAccessException e) {
|
|
||||||
throw new RuntimeException("Cannot access reflection.", e);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
@Override
|
|
||||||
public void set(Object target, Object value) {
|
|
||||||
try {
|
|
||||||
field.set(target, value);
|
|
||||||
} catch (IllegalAccessException e) {
|
|
||||||
throw new RuntimeException("Cannot access reflection.", e);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
@Override
|
|
||||||
public boolean hasField(Object target) {
|
|
||||||
// target instanceof DeclaringClass
|
|
||||||
return field.getDeclaringClass().isAssignableFrom(target.getClass());
|
|
||||||
}
|
|
||||||
};
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
// Search in parent classes
|
|
||||||
if (target.getSuperclass() != null)
|
|
||||||
return getField(target.getSuperclass(), name, fieldType, index);
|
|
||||||
throw new IllegalArgumentException("Cannot find field with type " + fieldType);
|
|
||||||
}
|
|
||||||
|
|
||||||
/**
|
|
||||||
* Search for the first publically and privately defined method of the given name and parameter count.
|
|
||||||
* @param clazz - a class to start with.
|
|
||||||
* @param methodName - the method name, or NULL to skip.
|
|
||||||
* @param params - the expected parameters.
|
|
||||||
* @return An object that invokes this specific method.
|
|
||||||
* @throws IllegalStateException If we cannot find this method.
|
|
||||||
*/
|
|
||||||
public static MethodInvoker getMethod(Class<?> clazz, String methodName, Class<?>... params) {
|
|
||||||
for (final Method method : clazz.getDeclaredMethods()) {
|
|
||||||
if ((methodName == null || method.getName().equals(methodName)) &&
|
|
||||||
Arrays.equals(method.getParameterTypes(), params)) {
|
|
||||||
|
|
||||||
method.setAccessible(true);
|
|
||||||
return new MethodInvoker() {
|
|
||||||
@Override
|
|
||||||
public Object invoke(Object target, Object... arguments) {
|
|
||||||
try {
|
|
||||||
return method.invoke(target, arguments);
|
|
||||||
} catch (Exception e) {
|
|
||||||
throw new RuntimeException("Cannot invoke method " + method, e);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
};
|
|
||||||
}
|
|
||||||
}
|
|
||||||
// Search in every superclass
|
|
||||||
if (clazz.getSuperclass() != null)
|
|
||||||
return getMethod(clazz.getSuperclass(), methodName, params);
|
|
||||||
throw new IllegalStateException(String.format(
|
|
||||||
"Unable to find method %s (%s).", methodName, Arrays.asList(params)));
|
|
||||||
}
|
|
||||||
|
|
||||||
/**
|
|
||||||
* Retrieve a class in the net.minecraft.server.VERSION.* package.
|
|
||||||
* @param name - the name of the class, excluding the package.
|
|
||||||
* @throws IllegalArgumentException If the class doesn't exist.
|
|
||||||
*/
|
|
||||||
public static Class<?> getMinecraftClass(String name) {
|
|
||||||
try {
|
|
||||||
return Class.forName(NMS_PREFIX + "." + name);
|
|
||||||
} catch (ClassNotFoundException e) {
|
|
||||||
throw new IllegalArgumentException("Cannot find nms." + name, e);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
/**
|
|
||||||
* Retrieve a class in the org.bukkit.craftbukkit.VERSION.* package.
|
|
||||||
* @param name - the name of the class, excluding the package.
|
|
||||||
* @throws IllegalArgumentException If the class doesn't exist.
|
|
||||||
*/
|
|
||||||
public static Class<?> getCraftBukkitClass(String name) {
|
|
||||||
try {
|
|
||||||
return Class.forName(OBC_PREFIX + "." + name);
|
|
||||||
} catch (ClassNotFoundException e) {
|
|
||||||
throw new IllegalArgumentException("Cannot find obc." + name, e);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
/**
|
|
||||||
* An interface for invoking a specific method.
|
|
||||||
*/
|
|
||||||
public interface MethodInvoker {
|
|
||||||
/**
|
|
||||||
* Invoke a method on a specific target object.
|
|
||||||
* @param target - the target object, or NULL for a static method.
|
|
||||||
* @param arguments - the arguments to pass to the method.
|
|
||||||
* @return The return value, or NULL if is void.
|
|
||||||
*/
|
|
||||||
public Object invoke(Object target, Object... arguments);
|
|
||||||
}
|
|
||||||
|
|
||||||
/**
|
|
||||||
* An interface for retrieving the field content.
|
|
||||||
* @param <T> - field type.
|
|
||||||
*/
|
|
||||||
public interface FieldAccessor<T> {
|
|
||||||
/**
|
|
||||||
* Retrieve the content of a field.
|
|
||||||
* @param target - the target object, or NULL for a static field.
|
|
||||||
* @return The value of the field.
|
|
||||||
*/
|
|
||||||
public T get(Object target);
|
|
||||||
|
|
||||||
/**
|
|
||||||
* Set the content of a field.
|
|
||||||
* @param target - the target object, or NULL for a static field.
|
|
||||||
* @param value - the new value of the field.
|
|
||||||
*/
|
|
||||||
public void set(Object target, Object value);
|
|
||||||
|
|
||||||
/**
|
|
||||||
* Determine if the given object has this field.
|
|
||||||
* @param target - the object to test.
|
|
||||||
* @return TRUE if it does, FALSE otherwise.
|
|
||||||
*/
|
|
||||||
public boolean hasField(Object target);
|
|
||||||
}
|
|
||||||
}
|
}
|
||||||
|
|||||||
In neuem Issue referenzieren
Einen Benutzer sperren