EDIT

/**

* Copyright (C) 2007 EDIT

* European Distributed Institute of Taxonomy 

* http://www.e-taxonomy.eu

* 

* The contents of this file are subject to the Mozilla Public License Version 1.1

* See LICENSE.TXT at the top of this package for the full license terms.

*/

package eu.etaxonomy.taxeditor.operations;

import java.util.Collections;

import java.util.List;

import java.util.Set;

import org.eclipse.core.commands.ExecutionException;

import org.eclipse.core.commands.operations.IUndoContext;

import org.eclipse.core.runtime.IAdaptable;

import org.eclipse.core.runtime.IProgressMonitor;

import org.eclipse.core.runtime.IStatus;

import eu.etaxonomy.cdm.model.description.DescriptionBase;

import eu.etaxonomy.cdm.model.description.DescriptionElementBase;

import eu.etaxonomy.cdm.model.media.Media;

import eu.etaxonomy.cdm.model.taxon.Taxon;

import eu.etaxonomy.taxeditor.store.StoreUtil;

/**

 * <p>MoveMediaInListOperation class.</p>

 *

 * @author p.ciardelli

 * @created 05.02.2009

 * @version 1.0

 */

public class MoveMediaInListOperation extends AbstractPostOperation {

	/** Constant <code>UP=1</code> */

	public static final int UP = 1;

	/** Constant <code>DOWN=-1</code> */

	public static final int DOWN = -1;

	private DescriptionBase description;

	private Media media;

	private int direction;

	/**

	 * <p>Constructor for MoveMediaInListOperation.</p>

	 *

	 * @param undoContext a {@link org.eclipse.core.commands.operations.IUndoContext} object.

	 * @param taxon a {@link eu.etaxonomy.cdm.model.taxon.Taxon} object.

	 * @param label a {@link java.lang.String} object.

	 * @param description a {@link eu.etaxonomy.cdm.model.description.DescriptionBase} object.

	 * @param media a {@link eu.etaxonomy.cdm.model.media.Media} object.

	 * @param direction a int.

	 * @param postOperationEnabled a {@link eu.etaxonomy.taxeditor.operations.IPostOperationEnabled} object.

	 */

	public MoveMediaInListOperation(String label, IUndoContext undoContext,

			Taxon taxon, DescriptionBase description, Media media,

			int direction, IPostOperationEnabled postOperationEnabled) {

		super(label, undoContext, taxon, postOperationEnabled);

		this.description = description;

		this.media = media;

		this.direction = direction;

	}

	/* (non-Javadoc)

	 * @see org.eclipse.core.commands.operations.AbstractOperation#execute(org.eclipse.core.runtime.IProgressMonitor, org.eclipse.core.runtime.IAdaptable)

	 */

	/** {@inheritDoc} */

	@Override

	public IStatus execute(IProgressMonitor monitor, IAdaptable info)

			throws ExecutionException {

		monitor.worked(20);

		moveMedia(description, media, direction);

		monitor.worked(40);

		return postExecute(media);

	}

	/* (non-Javadoc)

	 * @see org.eclipse.core.commands.operations.AbstractOperation#redo(org.eclipse.core.runtime.IProgressMonitor, org.eclipse.core.runtime.IAdaptable)

	 */

	/** {@inheritDoc} */

	@Override

	public IStatus redo(IProgressMonitor monitor, IAdaptable info)

			throws ExecutionException {	

		return execute(monitor, info);

	}

	/* (non-Javadoc)

	 * @see org.eclipse.core.commands.operations.AbstractOperation#undo(org.eclipse.core.runtime.IProgressMonitor, org.eclipse.core.runtime.IAdaptable)

	 */

	/** {@inheritDoc} */

	@Override

	public IStatus undo(IProgressMonitor monitor, IAdaptable info)

			throws ExecutionException {

		moveMedia(description, media, direction * -1);

		return postExecute(media);

	}

	private void moveMedia(DescriptionBase description, Media media, int direction){

		Set<DescriptionElementBase> elements = description.getElements();

		if(elements.size() != 1){

			StoreUtil.error(this.getClass(), "More than one description element in this image gallery", null);

		}

		DescriptionElementBase element = elements.iterator().next();

		List<Media> medias = element.getMedia();

		int index = medias.indexOf(media);

		int newIndex = index + direction;

		if(index < 0){

			return;

		}

		if (newIndex >= 0 && newIndex < medias.size()) {

			try{

				Collections.swap(medias, newIndex, index);

			}catch(ArrayIndexOutOfBoundsException e){

				StoreUtil.error(this.getClass(), e);

			}

		}	

	}

}