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Fork of Esoteric Software's Kryo built by Nathan Sweet that replaces Minlog with slf4j as the logging facade. This contains the shaded reflectasm jar to prevent conflicts with other versions of asm.

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/* Copyright (c) 2008, Nathan Sweet
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following
 * conditions are met:
 * 
 * - Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following
 * disclaimer in the documentation and/or other materials provided with the distribution.
 * - Neither the name of Esoteric Software nor the names of its contributors may be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
 * SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */

package com.esotericsoftware.kryo.util;

import java.util.ArrayList;

import com.esotericsoftware.kryo.Kryo;
import com.esotericsoftware.kryo.ReferenceResolver;

/** Uses an {@link ArrayList} to track objects that have already been written. This is more efficient than
 * {@link MapReferenceResolver} for graphs with few objects, providing an approximate 15% increase in deserialization speed. This
 * should not be used for graphs with many objects because it uses a linear look up to find objects that have already been
 * written.
 * @author Nathan Sweet  */
public class ListReferenceResolver implements ReferenceResolver {
	protected Kryo kryo;
	protected final ArrayList seenObjects = new ArrayList();

	public void setKryo (Kryo kryo) {
		this.kryo = kryo;
	}

	public int addWrittenObject (Object object) {
		int id = seenObjects.size();
		seenObjects.add(object);
		return id;
	}

	public int getWrittenId (Object object) {
		for (int i = 0, n = seenObjects.size(); i < n; i++)
			if (seenObjects.get(i) == object) return i;
		return -1;
	}

	public int nextReadId (Class type) {
		int id = seenObjects.size();
		seenObjects.add(null);
		return id;
	}

	public void setReadObject (int id, Object object) {
		seenObjects.set(id, object);
	}

	public Object getReadObject (Class type, int id) {
		return seenObjects.get(id);
	}

	public void reset () {
		seenObjects.clear();
	}

	/** Returns false for Boolean, Byte, Character, and Short. */
	public boolean useReferences (Class type) {
		return !Util.isWrapperClass(type);
	}
}