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ArrayIndexManagerValueVariant.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.*;

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

/**
 * This implementation of <code>ArrayIndexManager</code> provides
 * <code>ArrayIndex</code> to partition <code>ArrayVariant</code>s in 1-1
 * correspondence with <code>ValueVariant</code> for the array creation
 * expression.
 *
 * @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 ArrayIndexManagerValueVariant implements ArrayIndexManager
{
    /** 
     * A Map from <code>ValueVariant</code>s to <code>ArrayIndex</code>s.  
     */
    private Map valueVariantMap;

    /**
     * This implementation of <code>Index</code> provides an
     * <code>ArrayIndex</code> in 1-1 correspondence with the
     * <code>ValueVariant</code> for the array object.
     */
    class ArrayIndexValueVariant extends Index
    {
        /**
         * The <code>ValueVariant</code> to which the <code>ArrayIndex</code>
         * corresponds to.
         */
        ValueVariant valueVariant;
        
        /**
         * Creates a new <code>ArrayIndexValueVariant</code> instance.
         *
         * @param valueVariant the <code>ValueVariant</code> corresponding to
         * the array creation expression. 
         */
        ArrayIndexValueVariant(ValueVariant valueVariant) { 
            this.valueVariant = valueVariant; 
        }
    }

    /**
     * Constructor for the class. 
     */
    public ArrayIndexManagerValueVariant()
    {
        valueVariantMap = new HashMap();
    }
    /**
     * Reset the data structures in the Manager.
     *
     */
    public void reset() 
    {
        if (valueVariantMap != null) {
            valueVariantMap.clear();
        } // end of if (valueVariant != null)
    }
    /**
     * This method provides the <code>ArrayIndex</code> mapped to the given
     * <code>ValueVariant</code>.
     *
     * @param valueVariant the <code>ValueVariant</code> corresponding to array
     * creation expression. 
     * @return the <code>Index</code> corresponding to the provided
     * <code>ValueVariant</code>. */ 
    public Index select(ValueVariant valueVariant)
    {
        ArrayIndexValueVariant arrayIndex;
        
        if (valueVariantMap.containsKey(valueVariant)) {
            // if valueVariant is registered, then return index
            arrayIndex = (ArrayIndexValueVariant) 
                valueVariantMap.get(valueVariant);
        } else {
            // if value variant is not registered, then register it 
            // with a new ArrayIndexValueVariant
            arrayIndex = new ArrayIndexValueVariant(valueVariant);
            valueVariantMap.put(valueVariant,arrayIndex);
        }
        return arrayIndex;
    }
}

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