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Atem utilities for cloning, comparing and transforming

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/*******************************************************************************
 * Stefan Meyer, 2012 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 org.atemsource.atem.utility.compare.builder;

import java.util.Collections;
import java.util.HashSet;
import java.util.Set;

import org.atemsource.atem.api.attribute.MapAttribute;
import org.atemsource.atem.api.type.Type;
import org.atemsource.atem.utility.compare.AttributeComparison;
import org.atemsource.atem.utility.compare.CompareContext;
import org.atemsource.atem.utility.compare.Difference;


public class MapAttributeComparison extends AttributeComparison
{

	@Override
	public Set getDifferences(CompareContext context, Object a, Object b)
	{
		Set differences = new HashSet();
		MapAttribute mapAttribute = (MapAttribute) getAttribute();
		CompareContext childContext = context.createChild(mapAttribute);
		Object mapA = mapAttribute.getValue(a);
		Object mapB = mapAttribute.getValue(b);

		if (mapA == null && mapB == null)
		{
			return Collections.emptySet();
		}
		else if (mapA == null)
		{
			mapA = Collections.emptyMap();
		}
		else if (mapB == null)
		{
			mapB = Collections.emptyMap();
		}

		Set