/*******************************************************************************
 * Copyright (c) 2005-2008 Polarion Software.
 * 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:
 *    Alexander Gurov (Polarion Software) - initial API and implementation
 *******************************************************************************/

package org.eclipse.team.svn.core.connector;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;

/**
 * The merge information container
 * 
 * The JavaHL API's is the only way to interact between SVN and Java-based tools. At the same time JavaHL connector
 * library is not EPL compatible and we won't to pin plug-in with concrete connector implementation. So, the only way to
 * do this is providing our own connector interface which will be covered by concrete connector implementation.
 * 
 * @author Alexander Gurov
 */
public class SVNMergeInfo {
	/**
	 * Kind of merge info log classes
	 */
	public class LogKind {
		/**
		 * Does not exist
		 */
		public static final int ELIGIBLE = 0;

		/**
		 * Exists, but uninteresting
		 */
		public static final int MERGED = 1;
	}
	
	private Map<String, List<SVNRevisionRange>> mergeSources;

	public SVNMergeInfo() {
		this.mergeSources = new HashMap<String, List<SVNRevisionRange>>();
	}

	/**
	 * Add one or more RevisionRange objects to merge info.
	 * 
	 * @param mergeSrc
	 *            The merge source URL.
	 * @param range
	 *            List of RevisionRange objects to add.
	 */
	public void addRevisions(String mergeSrc, SVNRevisionRange[] ranges) {
		List<SVNRevisionRange> revisions = this.getRevisionList(mergeSrc);
		revisions.addAll(Arrays.asList(ranges));
	}

	/**
	 * Add a revision range to the merged revisions for a path.
	 * 
	 * @param mergeSrc
	 *            The merge source URL.
	 * @param range
	 *            The revision range to add.
	 */
	public void addRevisionRange(String mergeSrc, SVNRevisionRange range) {
		List<SVNRevisionRange> revisions = this.getRevisionList(mergeSrc);
		revisions.add(range);
	}

	/**
	 * Get the merge source URLs.
	 * 
	 * @return The merge source URLs.
	 */
	public String[] getPaths() {
		Set<String> pathSet = this.mergeSources.keySet();
		return pathSet == null ? null : pathSet.toArray(new String[pathSet.size()]);
	}

	/**
	 * Get the revision ranges for the specified merge source URL.
	 * 
	 * @param mergeSrc
	 *            The merge source URL, or <code>null</code>.
	 * @return Array of RevisionRange objects, or <code>null</code>.
	 */
	public SVNRevisionRange[] getRevisions(String mergeSrc) {
		List<SVNRevisionRange> revisions = this.mergeSources.get(mergeSrc);
		return revisions == null ? null : revisions.toArray(new SVNRevisionRange[revisions.size()]);
	}

	protected List<SVNRevisionRange> getRevisionList(String mergeSrc) {
		List<SVNRevisionRange> revisions = this.mergeSources.get(mergeSrc);
		if (revisions == null) {
			this.mergeSources.put(mergeSrc, revisions = new ArrayList<SVNRevisionRange>());
		}
		return revisions;
	}

}