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A Java Optimization Framework
There is a newer version: 4.1.0
package soot.dava.toolkits.base.AST.traversals;

/*-
 * #%L
 * Soot - a J*va Optimization Framework
 * %%
 * Copyright (C) 2006 Nomair A. Naeem
 * %%
 * This program 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 program 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 General Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * .
 * #L%
 */

import java.util.HashMap;

import soot.dava.internal.AST.ASTDoWhileNode;
import soot.dava.internal.AST.ASTForLoopNode;
import soot.dava.internal.AST.ASTIfElseNode;
import soot.dava.internal.AST.ASTIfNode;
import soot.dava.internal.AST.ASTLabeledBlockNode;
import soot.dava.internal.AST.ASTLabeledNode;
import soot.dava.internal.AST.ASTSwitchNode;
import soot.dava.internal.AST.ASTSynchronizedBlockNode;
import soot.dava.internal.AST.ASTTryNode;
import soot.dava.internal.AST.ASTUnconditionalLoopNode;
import soot.dava.internal.AST.ASTWhileNode;
import soot.dava.toolkits.base.AST.analysis.DepthFirstAdapter;

/*
 * For each labeled node make a mapping of the label (a string)
 * to the node.
 * Eg. if label1:
 *        while(cond){
 *            BodyA
 *        }
 *        
 *        Then the mapping is (label1,ASTWhileNode Reference)
 *        
 */
public class LabelToNodeMapper extends DepthFirstAdapter {
  private final HashMap labelsToNode;

  public LabelToNodeMapper() {
    labelsToNode = new HashMap();
  }

  public LabelToNodeMapper(boolean verbose) {
    super(verbose);
    labelsToNode = new HashMap();
  }

  /*
   * If the returned object is non null it is safe to cast it to ASTLabeledNode
   */
  public Object getTarget(String label) {
    return labelsToNode.get(label);
  }

  private void addToMap(ASTLabeledNode node) {
    String str = node.get_Label().toString();
    if (str != null) {
      labelsToNode.put(str, node);
    }
  }

  public void inASTLabeledBlockNode(ASTLabeledBlockNode node) {
    addToMap(node);
  }

  public void inASTTryNode(ASTTryNode node) {
    addToMap(node);
  }

  public void inASTUnconditionalLoopNode(ASTUnconditionalLoopNode node) {
    addToMap(node);
  }

  public void inASTDoWhileNode(ASTDoWhileNode node) {
    addToMap(node);
  }

  public void inASTForLoopNode(ASTForLoopNode node) {
    addToMap(node);
  }

  public void inASTIfElseNode(ASTIfElseNode node) {
    addToMap(node);
  }

  public void inASTIfNode(ASTIfNode node) {
    addToMap(node);
  }

  public void inASTWhileNode(ASTWhileNode node) {
    addToMap(node);
  }

  public void inASTSwitchNode(ASTSwitchNode node) {
    addToMap(node);
  }

  public void inASTSynchronizedBlockNode(ASTSynchronizedBlockNode node) {
    addToMap(node);
  }
}