org.eclipse.emf.compare.command.impl.CopyCommand.java Source code

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Here is the source code for org.eclipse.emf.compare.command.impl.CopyCommand.java

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/*******************************************************************************
 * Copyright (c) 2012 Obeo.
 * 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:
 *     Obeo - initial API and implementation
 *******************************************************************************/
package org.eclipse.emf.compare.command.impl;

import static org.eclipse.emf.compare.utils.EMFComparePredicates.hasState;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;

import java.util.Collection;
import java.util.List;

import org.eclipse.emf.common.notify.Notifier;
import org.eclipse.emf.compare.Diff;
import org.eclipse.emf.compare.DifferenceState;
import org.eclipse.emf.compare.command.ICompareCopyCommand;
import org.eclipse.emf.ecore.change.util.ChangeRecorder;
import org.eclipse.emf.edit.command.ChangeCommand;

/**
 * This command can be used to copy a number of diffs (or a single one) in a given direction.
 * <p>
 * <b>Note</b> that this will merge <i>all</i> differences that are passed to it, whether they're conflicting
 * or not.
 * </p>
 * 
 * @author <a href="mailto:laurent.goubet@obeo.fr">Laurent Goubet</a>
 */
public class CopyCommand extends ChangeCommand implements ICompareCopyCommand {
    /** The list of differences we are to merge. */
    private final List<Diff> differences;

    /** Direction of the merge operation. */
    private final boolean leftToRight;

    /**
     * Constructs an instance of this command given the list of differences that it needs to merge.
     * 
     * @param changeRecorder
     *            The change recorder associated to this command.
     * @param notifiers
     *            The collection of notifiers that will be notified of this command's execution.
     * @param differences
     *            The list of differences that this command should merge.
     * @param leftToRight
     *            The direction in which {@code differences} should be merged.
     */
    public CopyCommand(ChangeRecorder changeRecorder, Collection<Notifier> notifiers, List<Diff> differences,
            boolean leftToRight) {
        super(changeRecorder, notifiers);
        this.differences = ImmutableList.copyOf(differences);
        this.leftToRight = leftToRight;
    }

    /**
     * {@inheritDoc}
     * 
     * @see org.eclipse.emf.compare.command.ICompareCopyCommand#isLeftToRight()
     */
    public boolean isLeftToRight() {
        return leftToRight;
    }

    /**
     * {@inheritDoc}
     * 
     * @see org.eclipse.emf.common.command.AbstractCommand#getAffectedObjects()
     */
    @Override
    public Collection<?> getAffectedObjects() {
        return differences;
    }

    /**
     * {@inheritDoc}
     * 
     * @see org.eclipse.emf.common.command.AbstractCommand#canExecute()
     */
    @Override
    public boolean canExecute() {
        return super.canExecute() && Iterables.any(differences, hasState(DifferenceState.UNRESOLVED));
    }

    /**
     * {@inheritDoc}
     * 
     * @see org.eclipse.emf.edit.command.ChangeCommand#doExecute()
     */
    @Override
    protected void doExecute() {
        if (leftToRight) {
            for (Diff diff : differences) {
                diff.copyLeftToRight();
            }
        } else {
            for (Diff diff : differences) {
                diff.copyRightToLeft();
            }
        }
    }
}