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StaticFieldManager.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.soot.*;
import ca.mcgill.sable.util.*;

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

/**
 * This class manages the static variables.
 * @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 StaticFieldManager
{
    /** 
     * A Map from static fields to the associated flow graph node. 
     */
    private static Map fieldMap;

    /**
     * Provides the FG node associated with the provided static field.
     *
     * @param sootField the static field corresponding to which the FG node is
     * requried.
     * @return the associated FG node. 
     */
    static FGNodeField get(SootField sootField)
    {
        return (FGNodeField) fieldMap.get(sootField);
    }
    /**
     * Initializes the Manager.  
     */
    public static void init()
    {
        fieldMap = new HashMap();
    }
    /**
     * Adds a static field and the associated FG node.
     *
     * @param sootField the static field to be Managed.
     * @param node the FG node associated with sootField. 
     */
    static void put(SootField sootField, FGNodeField node)
    {
        fieldMap.put(sootField,node);
    }
    /**
     * Reset the data structures of the manager.
     *
     */
    static void reset() {
        if (fieldMap != null) {
            fieldMap.clear();
        } // end of if (fieldMap != null)
    }
    /**
     * Provides the flow graph node associated with the provided static field.
     * if none exists then a new one is created.
     *
     * @param sootField the static field corresponding to which the flow graph
     * node is required.
     * @return the associated flow graph node. 
     */
    public static FGNodeField select(SootField sootField)
    {
        FGNodeField node;

        if (fieldMap.containsKey(sootField)) {
            node = get(sootField);
        } else {
            node = new FGNodeField(sootField);
            put(sootField,node);

        }
        return node;
    }
}

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