layers/plugins/org.eclipse.papyrus.infra.gmfdiag.layers.model/src/org/eclipse/papyrus/internal/infra/gmfdiag/layers/model/operators/FillAverageOperator.java

/*******************************************************************************
 * Copyright (c) 2013 CEA LIST.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Cedric Dumoulin - cedric.dumoulin@lifl.fr
 ******************************************************************************/
package org.eclipse.papyrus.internal.infra.gmfdiag.layers.model.operators;

import org.eclipse.emf.common.util.EList;
import org.eclipse.papyrus.internal.infra.gmfdiag.layers.model.LayersException;
import org.eclipse.papyrus.internal.infra.gmfdiag.layers.model.command.ComputePropertyValueCommand;
import org.eclipse.papyrus.internal.infra.gmfdiag.layers.model.layers.BooleanInstance;
import org.eclipse.papyrus.internal.infra.gmfdiag.layers.model.layers.ColorInstance;
import org.eclipse.papyrus.internal.infra.gmfdiag.layers.model.layers.FillInstance;
import org.eclipse.papyrus.internal.infra.gmfdiag.layers.model.layers.LayersFactory;
import org.eclipse.papyrus.internal.infra.gmfdiag.layers.model.layers.TypeInstance;


/**
 * @author cedric dumoulin
 *
 */
public class FillAverageOperator implements CustomPropertyOperatorsInstance {

	public static final BooleanInstance FALSE_INSTANCE;
	public static final BooleanInstance TRUE_INSTANCE;

	static {
		FALSE_INSTANCE = LayersFactory.eINSTANCE.createBooleanInstance();
		FALSE_INSTANCE.setValue(false);
		TRUE_INSTANCE = LayersFactory.eINSTANCE.createBooleanInstance();
		TRUE_INSTANCE.setValue(true);
	}

	/**
	 *
	 * @see org.eclipse.papyrus.internal.infra.gmfdiag.layers.model.operators.CustomPropertyOperatorsInstance#getComputePropertyValueCommand(org.eclipse.emf.common.util.EList)
	 *
	 * @param property
	 * @return
	 * @throws LayersException
	 */
	@Override
	public ComputePropertyValueCommand getComputePropertyValueCommand(EList<ComputePropertyValueCommand> nestedCommand) throws LayersException {
		return new FillAverageCommand(nestedCommand);
	}


	/**
	 * Class implementing an And command.
	 *
	 */
	class FillAverageCommand implements ComputePropertyValueCommand {

		EList<ComputePropertyValueCommand> nestedCommand;

		/**
		 *
		 * Constructor.
		 *
		 * @param nestedCommand
		 */
		public FillAverageCommand(EList<ComputePropertyValueCommand> nestedCommand) {
			this.nestedCommand = nestedCommand;
		}

		/**
		 * Compute the value.
		 *
		 * @see org.eclipse.papyrus.internal.infra.gmfdiag.layers.model.command.ComputePropertyValueCommand#getCmdValue()
		 *
		 * @return
		 * @throws LayersException
		 */
		@Override
		public TypeInstance getCmdValue() throws LayersException {

			int fill = 0;
			int color = 0;
			// compute the average values
			for (ComputePropertyValueCommand curCmd : nestedCommand) {
				FillInstance curValue = ((FillInstance) curCmd.getCmdValue());
				fill += curValue.getTransparency();
				color += curValue.getFillColor().getValue();
			}

			// Create a result
			FillInstance res = LayersFactory.eINSTANCE.createFillInstance();
			ColorInstance colorInstance = LayersFactory.eINSTANCE.createColorInstance();
			res.setFillColor(colorInstance);
			res.setTransparency(fill / nestedCommand.size());
			res.getFillColor().setValue(color / nestedCommand.size());
			return res;
		}

	}
}