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ValueIndexManagerAlloc.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.*;

/* 
 * ValueIndexManagerAlloc.java 
 * $Id: ValueIndexManagerAlloc.java,v 1.1.1.1 2002/01/24 03:42:08 pserver Exp $
 */

/**
 * Class that provides indices to identify various value variants associated
 * with the same method and position in the method. 
 * @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 ValueIndexManagerAlloc extends ValueIndexManager
{
    /** 
     * A map from method variant to code index.
     */
    private Map methodVariantMap;

    /** 
     * Implementation of Index which are method variant and code position
     * specific. 
     */
    public class ValueIndexAlloc extends Index
    {
        /** 
         * The method variant in which the index's variant originated. 
         */
        MethodVariant methodVariant;

        /** 
         * The position in code where the index's variant originated. 
         */
        Index     codeIndex;

        /**
         * Constructor of the class.
         *
         * @param methodVariant the method in which the variant originated.
         * @param codeIndex the position in the method where the variant
         * originated. 
         */
        public ValueIndexAlloc(MethodVariant methodVariant, Index codeIndex)
        {
            this.methodVariant = methodVariant;
            this.codeIndex     = codeIndex;
        }
    }

    /** 
     * Constructor of the class.
     */
    public ValueIndexManagerAlloc()
    {
        methodVariantMap = new HashMap();
    }
    /** 
     * Provide value index corresponding to the given method variant and code
     * index. if none exists then create a new index.
     *
     * @param methodVariant the method to which the value index is associated.
     * @param codeIndex the position to which the value index is associated.
     * @return the associated index. */
    public Index select(MethodVariant methodVariant, Index codeIndex)
    {
        ValueIndexAlloc valueIndex;
        Map             codeIndexMap;

        if (methodVariantMap.containsKey(methodVariant)) {
            // if methodVariant is registered, then return method.
            codeIndexMap = (Map) methodVariantMap.get(methodVariant);

            if (codeIndexMap.containsKey(codeIndex)) {
                // return value index for this method variant and code index
                valueIndex = (ValueIndexAlloc) codeIndexMap.get(codeIndex);
            } else {
                // position was not registered, so add position and make new index
                valueIndex = new ValueIndexAlloc(methodVariant,codeIndex);
                codeIndexMap.put(codeIndex,valueIndex);
            }
        } else {
            // if method variant is not registered, then register it 
            // with an empty position Map, and make a new position entry as
            // well.

            codeIndexMap   = new HashMap();
            valueIndex    = new ValueIndexAlloc(methodVariant,codeIndex);
            codeIndexMap.put(codeIndex,valueIndex);
            methodVariantMap.put(methodVariant,codeIndexMap);
        }

        return valueIndex;
    }
}

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