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Paper/Bukkit-Patches/0006-Refactor-conversions-from-LazyMetadataValue-into-abs.patch

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From 0d2be83dcf857b4b29c304bfb4b5d67dde23a13c Mon Sep 17 00:00:00 2001
From: crast <contact@jamescrasta.com>
Date: Sat, 16 Feb 2013 14:33:24 -0700
Subject: [PATCH] Refactor conversions from LazyMetadataValue into abstract
base class
Implementing MetadataValue interface is significant work due to having
to provide a large amount of conversion stub method. This adds a new
optional abstract base class to aid in implementation.
Includes comprehensive unit tests including a sample adapter class, and
all existing metadata tests pass.
---
.../org/bukkit/metadata/LazyMetadataValue.java | 60 +----------------
.../org/bukkit/metadata/MetadataValueAdapter.java | 77 ++++++++++++++++++++++
.../bukkit/metadata/MetadataValueAdapterTest.java | 44 +++++++++++++
3 files changed, 123 insertions(+), 58 deletions(-)
create mode 100644 src/main/java/org/bukkit/metadata/MetadataValueAdapter.java
create mode 100644 src/test/java/org/bukkit/metadata/MetadataValueAdapterTest.java
diff --git a/src/main/java/org/bukkit/metadata/LazyMetadataValue.java b/src/main/java/org/bukkit/metadata/LazyMetadataValue.java
index cc0ba50..9b66da9 100644
--- a/src/main/java/org/bukkit/metadata/LazyMetadataValue.java
+++ b/src/main/java/org/bukkit/metadata/LazyMetadataValue.java
@@ -5,7 +5,6 @@ import java.util.concurrent.Callable;
import org.apache.commons.lang.Validate;
import org.bukkit.plugin.Plugin;
-import org.bukkit.util.NumberConversions;
/**
* The LazyMetadataValue class implements a type of metadata that is not computed until another plugin asks for it.
@@ -14,11 +13,10 @@ import org.bukkit.util.NumberConversions;
* or invalidated at the individual or plugin level. Once invalidated, the LazyMetadataValue will recompute its value
* when asked.
*/
-public class LazyMetadataValue implements MetadataValue {
+public class LazyMetadataValue extends MetadataValueAdapter implements MetadataValue {
private Callable<Object> lazyValue;
private CacheStrategy cacheStrategy;
private SoftReference<Object> internalValue = new SoftReference<Object>(null);
- private Plugin owningPlugin;
private static final Object ACTUALLY_NULL = new Object();
/**
@@ -39,19 +37,14 @@ public class LazyMetadataValue implements MetadataValue {
* @param lazyValue the lazy value assigned to this metadata value.
*/
public LazyMetadataValue(Plugin owningPlugin, CacheStrategy cacheStrategy, Callable<Object> lazyValue) {
- Validate.notNull(owningPlugin, "owningPlugin cannot be null");
+ super(owningPlugin);
Validate.notNull(cacheStrategy, "cacheStrategy cannot be null");
Validate.notNull(lazyValue, "lazyValue cannot be null");
this.lazyValue = lazyValue;
- this.owningPlugin = owningPlugin;
this.cacheStrategy = cacheStrategy;
}
- public Plugin getOwningPlugin() {
- return owningPlugin;
- }
-
public Object value() {
eval();
Object value = internalValue.get();
@@ -61,55 +54,6 @@ public class LazyMetadataValue implements MetadataValue {
return value;
}
- public int asInt() {
- return NumberConversions.toInt(value());
- }
-
- public float asFloat() {
- return NumberConversions.toFloat(value());
- }
-
- public double asDouble() {
- return NumberConversions.toDouble(value());
- }
-
- public long asLong() {
- return NumberConversions.toLong(value());
- }
-
- public short asShort() {
- return NumberConversions.toShort(value());
- }
-
- public byte asByte() {
- return NumberConversions.toByte(value());
- }
-
- public boolean asBoolean() {
- Object value = value();
- if (value instanceof Boolean) {
- return (Boolean) value;
- }
-
- if (value instanceof Number) {
- return ((Number) value).intValue() != 0;
- }
-
- if (value instanceof String) {
- return Boolean.parseBoolean((String) value);
- }
-
- return value != null;
- }
-
- public String asString() {
- Object value = value();
-
- if (value == null) {
- return "";
- }
- return value.toString();
- }
/**
* Lazily evaluates the value of this metadata item.
diff --git a/src/main/java/org/bukkit/metadata/MetadataValueAdapter.java b/src/main/java/org/bukkit/metadata/MetadataValueAdapter.java
new file mode 100644
index 0000000..9ec7e61
--- /dev/null
+++ b/src/main/java/org/bukkit/metadata/MetadataValueAdapter.java
@@ -0,0 +1,77 @@
+package org.bukkit.metadata;
+
+import org.apache.commons.lang.Validate;
+import org.bukkit.plugin.Plugin;
+import org.bukkit.util.NumberConversions;
+
+/**
+ * Optional base class for facilitating MetadataValue implementations.
+ *
+ * This provides all the conversion functions for MetadataValue
+ * so that writing an implementation of MetadataValue is as simple
+ * as implementing value() and invalidate()
+ *
+ */
+public abstract class MetadataValueAdapter implements MetadataValue {
+ protected final Plugin owningPlugin;
+
+ protected MetadataValueAdapter(Plugin owningPlugin) {
+ Validate.notNull(owningPlugin, "owningPlugin cannot be null");
+ this.owningPlugin = owningPlugin;
+ }
+
+ public Plugin getOwningPlugin() {
+ return owningPlugin;
+ }
+
+ public int asInt() {
+ return NumberConversions.toInt(value());
+ }
+
+ public float asFloat() {
+ return NumberConversions.toFloat(value());
+ }
+
+ public double asDouble() {
+ return NumberConversions.toDouble(value());
+ }
+
+ public long asLong() {
+ return NumberConversions.toLong(value());
+ }
+
+ public short asShort() {
+ return NumberConversions.toShort(value());
+ }
+
+ public byte asByte() {
+ return NumberConversions.toByte(value());
+ }
+
+ public boolean asBoolean() {
+ Object value = value();
+ if (value instanceof Boolean) {
+ return (Boolean) value;
+ }
+
+ if (value instanceof Number) {
+ return ((Number) value).intValue() != 0;
+ }
+
+ if (value instanceof String) {
+ return Boolean.parseBoolean((String) value);
+ }
+
+ return value != null;
+ }
+
+ public String asString() {
+ Object value = value();
+
+ if (value == null) {
+ return "";
+ }
+ return value.toString();
+ }
+
+}
diff --git a/src/test/java/org/bukkit/metadata/MetadataValueAdapterTest.java b/src/test/java/org/bukkit/metadata/MetadataValueAdapterTest.java
new file mode 100644
index 0000000..5ae7df4
--- /dev/null
+++ b/src/test/java/org/bukkit/metadata/MetadataValueAdapterTest.java
@@ -0,0 +1,44 @@
+package org.bukkit.metadata;
+
+import static org.junit.Assert.assertEquals;
+
+import org.bukkit.plugin.Plugin;
+import org.bukkit.plugin.TestPlugin;
+import org.junit.Test;
+
+public class MetadataValueAdapterTest {
+ private TestPlugin plugin = new TestPlugin("x");
+
+ @Test
+ public void testIncrementingAdapter() {
+ IncrementingMetaValue mv = new IncrementingMetaValue(plugin);
+ // check getOwningPlugin
+ assertEquals(mv.getOwningPlugin(), this.plugin);
+
+ // check the various value-making methods
+ assertEquals(mv.asInt(), 1);
+ assertEquals(mv.asLong(), 2L);
+ assertEquals(mv.asFloat(), 3.0, 0.001);
+ assertEquals(mv.asByte(), 4);
+ assertEquals(mv.asDouble(), 5.0, 0.001);
+ assertEquals(mv.asShort(), 6);
+ assertEquals(mv.asString(), "7");
+ }
+
+ /** Silly Metadata implementation that increments every time value() is called */
+ class IncrementingMetaValue extends MetadataValueAdapter {
+ private int internalValue = 0;
+
+ protected IncrementingMetaValue(Plugin owningPlugin) {
+ super(owningPlugin);
+ }
+
+ public Object value() {
+ return ++internalValue;
+ }
+
+ public void invalidate() {
+ internalValue = 0;
+ }
+ }
+}
--
1.8.1-rc2
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