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Add NbtFactory#fromItemOptional

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

Fixes #376
This commit is contained in:
Dan Mulloy 2017-08-13 23:00:51 -04:00
parent 1b23e9ec22
commit 4483ce0d79
1 changed files with 26 additions and 0 deletions
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26
modules/API/src/main/java/com/comphenix/protocol/wrappers/nbt/NbtFactory.java
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@ -26,6 +26,7 @@ import java.lang.reflect.Method;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
@ -168,6 +169,31 @@ public class NbtFactory {
}
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.