mirror of
https://github.com/dmulloy2/ProtocolLib.git
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111 lines
3.7 KiB
Java
111 lines
3.7 KiB
Java
/*
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* ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
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* Copyright (C) 2012 Kristian S. Stangeland
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*
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* This program is free software; you can redistribute it and/or modify it under the terms of the
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* GNU General Public License as published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with this program;
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* if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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* 02111-1307 USA
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*/
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package com.comphenix.protocol.reflect.cloning;
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import com.comphenix.protocol.reflect.ObjectWriter;
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import com.comphenix.protocol.reflect.StructureModifier;
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import com.comphenix.protocol.reflect.instances.InstanceProvider;
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import com.comphenix.protocol.reflect.instances.NotConstructableException;
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/**
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* Represents a class capable of cloning objects by deeply copying its fields.
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*
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* @author Kristian
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*/
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public class FieldCloner implements Cloner {
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protected Cloner defaultCloner;
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protected InstanceProvider instanceProvider;
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// Used to clone objects
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protected ObjectWriter writer;
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/**
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* Constructs a field cloner that copies objects by reading and writing the internal fields directly.
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* @param defaultCloner - the default cloner used while copying fields.
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* @param instanceProvider - used to construct new, empty copies of a given type.
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*/
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public FieldCloner(Cloner defaultCloner, InstanceProvider instanceProvider) {
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this.defaultCloner = defaultCloner;
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this.instanceProvider = instanceProvider;
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// Remember to clone the value too
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this.writer = new ObjectWriter() {
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@Override
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protected void transformField(StructureModifier<Object> modifierSource,
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StructureModifier<Object> modifierDest, int fieldIndex) {
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defaultTransform(modifierDest, modifierDest, getDefaultCloner(), fieldIndex);
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}
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};
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}
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/**
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* Default implementation of the field transform. Applies a clone operation before a field value is written.
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* @param modifierSource - modifier for the original object.
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* @param modifierDest - modifier for the new cloned object.
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* @param defaultCloner - cloner to use.
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* @param fieldIndex - the current field index.
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*/
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protected void defaultTransform(StructureModifier<Object> modifierSource,
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StructureModifier<Object> modifierDest, Cloner defaultCloner, int fieldIndex) {
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Object value = modifierSource.read(fieldIndex);
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modifierDest.write(fieldIndex, defaultCloner.clone(value));
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}
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@Override
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public boolean canClone(Object source) {
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if (source == null)
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return false;
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// Attempt to create the type
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try {
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return instanceProvider.create(source.getClass()) != null;
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} catch (NotConstructableException e) {
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return false;
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}
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}
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@Override
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public Object clone(Object source) {
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if (source == null)
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throw new IllegalArgumentException("source cannot be NULL.");
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Object copy = instanceProvider.create(source.getClass());
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// Copy public and private fields alike. Skip static fields.
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writer.copyTo(source, copy, source.getClass());
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return copy;
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}
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/**
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* Retrieve the default cloner used to clone the content of each field.
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* @return Cloner used to clone fields.
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*/
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public Cloner getDefaultCloner() {
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return defaultCloner;
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}
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/**
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* Retrieve the instance provider this cloner is using to create new, empty classes.
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* @return The instance provider in use.
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*/
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public InstanceProvider getInstanceProvider() {
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return instanceProvider;
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}
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}
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