/*
 * FindBugs - Find bugs in Java programs
 * Copyright (C) 2004, University of Maryland
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package edu.umd.cs.findbugs.detect;

import java.util.HashSet;
import java.util.Iterator;

/**
 * Set of streams that are in an equivalence class.
 *
 * @author David Hovemeyer
 */
public class StreamEquivalenceClass {
	private HashSet<Stream> memberSet;
	private boolean isClosed;

	/**
	 * Constructor.
	 * Creates an empty set.
	 */
	public StreamEquivalenceClass() {
		this.memberSet = new HashSet<Stream>();
		this.isClosed = false;
	}

	/**
	 * Add a single member to the equivalence class.
	 *
	 * @param member the member Stream
	 */
	public void addMember(Stream member) {
		memberSet.add(member);
	}

	/**
	 * Get Iterator over the members of the class.
	 */
	public Iterator<Stream> memberIterator() {
		return memberSet.iterator();
	}

	/**
	 * Add all members of other StreamEquivalenceClass to this one.
	 *
	 * @param other the other StreamEquivalenceClass
	 */
	public void addAll(StreamEquivalenceClass other) {
		memberSet.addAll(other.memberSet);
	}

	/**
	 * Mark all members of the class as being closed.
	 */
	public void setClosed() {
		if (!isClosed) {
			isClosed = true;
			for (Stream member : memberSet) {
				member.setClosed();
			}
		}
	}
}

// vim:ts=4
