/*******************************************************************************
 * <copyright>
 *
 * Copyright (c) 2005, 2010 SAP AG.
 * 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:
 *    SAP AG - initial API, implementation and documentation
 *
 * </copyright>
 *
 *******************************************************************************/
package org.eclipse.graphiti.internal.command;

import org.eclipse.graphiti.features.IDirectEditingFeature;
import org.eclipse.graphiti.features.context.IDirectEditingContext;
import org.eclipse.graphiti.features.impl.AbstractDirectEditingFeature;
import org.eclipse.graphiti.func.IProposal;
import org.eclipse.graphiti.func.IProposalSupport;

/**
 * The Class DirectEditingFeatureCommandWithContext.
 * 
 * @noinstantiate This class is not intended to be instantiated by clients.
 * @noextend This class is not intended to be subclassed by clients.
 */
public class DirectEditingFeatureCommandWithContext extends GenericFeatureCommandWithContext {

	private String newValue;
	private IProposal proposal;

	/**
	 * Instantiates a new direct editing feature command with context.
	 * 
	 * @param feature
	 *            the feature
	 * @param context
	 *            the context
	 * @param valueObject
	 *            the value object
	 */
	public DirectEditingFeatureCommandWithContext(IDirectEditingFeature feature, IDirectEditingContext context, String valueObject,
			IProposal proposal) {
		super(feature, context);
		setNewValue(valueObject);
		setProposal(proposal);
	}

	private String getNewValue() {
		return newValue;
	}

	private void setNewValue(String newValue) {
		this.newValue = newValue;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.graphiti.internal.command.GenericFeatureCommandWithContext
	 * #execute()
	 */
	@Override
	public boolean execute() {
		boolean ret = false;
		if (getFeature() instanceof IDirectEditingFeature && getContext() instanceof IDirectEditingContext) {
			IDirectEditingFeature def = (IDirectEditingFeature) getFeature();
			IDirectEditingContext dec = (IDirectEditingContext) getContext();
			String initialValue = def.getInitialValue(dec);
			if (initialValue == null) {
				initialValue = ""; //$NON-NLS-1$
			}
			if (!initialValue.equals(getNewValue())) {
				IProposalSupport proposalSupport = def.getProposalSupport();
				if (proposalSupport == null) { // simple mode with
												// strings as proposals
					def.setValue(getNewValue(), dec);
				} else {
					proposalSupport.setValue(getNewValue(), getProposal(), dec);
				}
				ret = true;
				// Notify the feature that there really are changes
				if (getFeature() instanceof AbstractDirectEditingFeature) {
					((AbstractDirectEditingFeature) getFeature()).setValueChanged();
				}
			}
		}
		return ret;
	}

	/**
	 * @return the proposal
	 */
	private IProposal getProposal() {
		return proposal;
	}

	/**
	 * @param proposal
	 *            the proposal to set
	 */
	private void setProposal(IProposal proposal) {
		this.proposal = proposal;
	}
}