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Framework to detect and handle differences between Java objects

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/*
 * Copyright 2012 Daniel Bechler
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package de.danielbechler.diff.access;

import de.danielbechler.diff.selector.ElementSelector;
import de.danielbechler.diff.selector.RootElementSelector;

/**
 * @author Daniel Bechler
 */
public final class RootAccessor implements Accessor
{
	private static final RootAccessor instance = new RootAccessor();

	public static RootAccessor getInstance()
	{
		return instance;
	}

	private RootAccessor()
	{
	}

	public Object get(final Object target)
	{
		return target;
	}

	public void set(final Object target, final Object value)
	{
		throw new UnsupportedOperationException();
	}

	public void unset(final Object target)
	{
		throw new UnsupportedOperationException();
	}

	public ElementSelector getElementSelector()
	{
		return RootElementSelector.getInstance();
	}

	@Override
	public String toString()
	{
		return "root element";
	}
}