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CodeIndexManagerAlloc.java

package edu.ksu.cis.bandera.bofa;

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Bandera, a Java(TM) analysis and transformation toolkit           *
 * Copyright (C) 1998, 1999                                          *
 * John Hatcliff (hatcliff@cis.ksu.edu)
 * All rights reserved.                                              *
 *                                                                   *
 * This work was done as a project in the SAnToS Laboratory,         *
 * Department of Computing and Information Sciences, Kansas State    *
 * University, USA (http://www.cis.ksu.edu/santos).                  *
 * It is understood that any modification not identified as such is  *
 * not covered by the preceding statement.                           *
 *                                                                   *
 * This work is free software; you can redistribute it and/or        *
 * modify it under the terms of the GNU Library General Public       *
 * License as published by the Free Software Foundation; either      *
 * version 2 of the License, or (at your option) any later version.  *
 *                                                                   *
 * This work 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 *
 * Library General Public License for more details.                  *
 *                                                                   *
 * You should have received a copy of the GNU Library General Public *
 * License along with this toolkit; if not, write to the             *
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,      *
 * Boston, MA  02111-1307, USA.                                      *
 *                                                                   *
 * Java is a trademark of Sun Microsystems, Inc.                     *
 *                                                                   *
 * To submit a bug report, send a comment, or get the latest news on *
 * this project and other SAnToS projects, please visit the web-site *
 *                http://www.cis.ksu.edu/santos                      *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

import ca.mcgill.sable.util.*;
import ca.mcgill.sable.soot.*;
import ca.mcgill.sable.soot.jimple.Value;

/*
 * CodeIndexManagerAlloc.java
 * $Id: CodeIndexManagerAlloc.java,v 1.1.1.1 2002/01/24 03:42:07 pserver Exp $
 */

/**
 * This class generates an index to partition object creation sites.
 *
 * @author <A HREF="http://www.cis.ksu.edu/~hatcliff">John Hatcliff</A>
 * @author 
 * <a href="http://www.cis.ksu.edu/~rvprasad">Venkatesh Prasad Ranganath</a> 
 *
 * @version $Name:  $($Revision: 1.1.1.1 $)
 */
public class CodeIndexManagerAlloc implements CodeIndexManager
{
    /**
     * Maps the <code>Value</code> object to a index.
     */
    Map positionMap;

    /**
     * An implementation of Index for tracking code.
     */
    class CodeIndexAlloc extends Index
    {
        /** 
         * The <code>Value</code> object associated with this object.
         */
        private Value position;
        
        /**
         * Constructor of the class.
         *
         * @param position <code>Value</code> object associated with this object.
        */ 
        CodeIndexAlloc(Value position)
        {
            this.position = position;
        }
        
        /**
         * Returns the corresponding Value object.
         *
         * @return The corresponding Value object.
         */
        public Value getPosition()
        {
            return position;
        }
    }

    /** 
     * Constructor for the class.
     */
    public CodeIndexManagerAlloc()
    {
        positionMap = new HashMap();
    }
    /**
     * Resets the data structures inside the manager.
     *
     */
    public void reset() 
    {
        positionMap.clear();
    }
    /**
     * Provides the index corresponding to the given position.  If an index does
     * not exist then a new one is created.
     *
     * @param position The <code>Value</code> for which the Index is requested.
     * @return The <code>Index</code> corresponding to the given Value object.
     */
    public Index select(Value position)
    {
        Index codeIndex;
        Value p = position; 
        
        if (positionMap.containsKey(p)) {
            // if position is already registered, return the associated 
            // index object.
            codeIndex = (Index) positionMap.get(p);
        } else {
            // if position is not registered, then register it
            codeIndex = new CodeIndexAlloc(position);
            positionMap.put(p,codeIndex);
        }
        return codeIndex;
    }
}

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