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/* Soot - a J*va Optimization Framework
 * Copyright (C) 1999 Patrice Pominville, Raja Vallee-Rai, Patrick Lam
 *
 * 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.
 */

/*
 * Modified by the Sable Research Group and others 1997-1999.  
 * See the 'credits' file distributed with Soot for the complete list of
 * contributors.  (Soot is distributed at http://www.sable.mcgill.ca/soot)
 */


package soot.toolkits.graph;


import java.util.*;

import soot.*;
import soot.util.*;




/**
 *   HashMap based implementation of a MutableBlockGraph.
 */

public class HashMutableDirectedGraph implements MutableDirectedGraph {
		

    protected HashMap> nodeToPreds = new HashMap();
    protected HashMap> nodeToSuccs = new HashMap();

    protected Chain heads = new HashChain();
    protected Chain tails = new HashChain();

    public HashMutableDirectedGraph()
    {
    }

    /** Removes all nodes and edges. */
    public void clearAll() {
        nodeToPreds = new HashMap();
        nodeToSuccs = new HashMap();
        heads = new HashChain();
        tails = new HashChain();
    }

    public Object clone() {
        HashMutableDirectedGraph g = new HashMutableDirectedGraph();
        g.nodeToPreds = (HashMap)nodeToPreds.clone();
        g.nodeToSuccs = (HashMap)nodeToSuccs.clone();
        g.heads = HashChain.listToHashChain(HashChain.toList(heads));
        g.tails = HashChain.listToHashChain(HashChain.toList(tails));
        return g;
    }

    /* Returns an unbacked list of heads for this graph. */
    public List getHeads()
    {
        ArrayList l = new ArrayList(); l.addAll(heads);
        return Collections.unmodifiableList(l);
    }

    /* Returns an unbacked list of tails for this graph. */
    public List getTails()
    {
        ArrayList l = new ArrayList(); l.addAll(tails);
        return Collections.unmodifiableList(l);
    }

    public List getPredsOf(Object s)
    {
        Set preds = nodeToPreds.get(s);
        if (preds != null)
            return new LinkedList(preds);
        else
            throw new RuntimeException(s+"not in graph!");
    }
    
    /**
     * Same as {@link #getPredsOf(Object)} but returns a set.
     * This is faster than calling {@link #getPredsOf(Object)}.
     * Also, certain operations like {@link Collection#contains(Object)}
     * execute faster on the set than on the list.
     * The returned set is unmodifiable. 
     */
    public Set getPredsOfAsSet(Object s)
    {
        Set preds = nodeToPreds.get(s);
        if (preds != null)
            return Collections.unmodifiableSet(preds);
        else
            throw new RuntimeException(s+"not in graph!");
    }

    public List getSuccsOf(Object s)
    {
        Set succs = nodeToSuccs.get(s);
        if (succs != null)
            return new LinkedList(succs);
        else
            throw new RuntimeException(s+"not in graph!");
    }
    
    /**
     * Same as {@link #getSuccsOf(Object)} but returns a set.
     * This is faster than calling {@link #getSuccsOf(Object)}.
     * Also, certain operations like {@link Collection#contains(Object)}
     * execute faster on the set than on the list.
     * The returned set is unmodifiable. 
     */
    public Set getSuccsOfAsSet(Object s)
    {
        Set succs = nodeToSuccs.get(s);
        if (succs != null)
            return Collections.unmodifiableSet(succs);
        else
            throw new RuntimeException(s+"not in graph!");
    }


    public int size()
    {
        return nodeToPreds.keySet().size();
    }

    public Iterator iterator()
    {
        return nodeToPreds.keySet().iterator();
    }

    public void addEdge(Object from, Object to)
    {
        if (from == null || to == null)
						throw new RuntimeException("edge from or to null");

        if (containsEdge(from, to))
            return;

        Set