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Add NbtFactory#fromItemOptional

This new method won't create tags if they don't already exists

Fixes #376
Dieser Commit ist enthalten in:
Dan Mulloy 2017-08-13 23:00:51 -04:00
Ursprung 1b23e9ec22
Commit 4483ce0d79

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@ -26,6 +26,7 @@ import java.lang.reflect.Method;
import java.util.Collection; import java.util.Collection;
import java.util.List; import java.util.List;
import java.util.Map; import java.util.Map;
import java.util.Optional;
import java.util.zip.GZIPInputStream; import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream; import java.util.zip.GZIPOutputStream;
@ -169,6 +170,31 @@ public class NbtFactory {
return fromBase(result); return fromBase(result);
} }
/**
* Constructs a wrapper for a NBT tag in an ItemStack. This is where auxillary
* data such as enchantments, name, and lore is stored. It doesn't include the material,
* damage value, or stack size.
* <p>
* This differs from {@link #fromItemTag(ItemStack)} in that the tag is not created if it
* doesn't already exist.
*
* @param stack the ItemStack. Must be a CraftItemStack. Use {@link MinecraftReflection#getBukkitItemStack(Object)}
* @return A wrapper for the NBT tag if it exists, an empty Optional if not
*/
public static Optional<NbtWrapper<?>> fromItemOptional(ItemStack stack) {
checkItemStack(stack);
StructureModifier<NbtBase<?>> modifier = getStackModifier(stack);
NbtBase<?> result = modifier.read(0);
// Create the tag if it doesn't exist
if (result == null) {
return Optional.empty();
}
return Optional.of(fromBase(result));
}
/** /**
* Load a NBT compound from a GZIP compressed file. * Load a NBT compound from a GZIP compressed file.
* @param file - the source file. * @param file - the source file.