CodeEnv


1   /*
2    * The contents of this file are subject to the terms 
3    * of the Common Development and Distribution License 
4    * (the License).  You may not use this file except in
5    * compliance with the License.
6    * 
7    * You can obtain a copy of the license at 
8    * https://glassfish.dev.java.net/public/CDDLv1.0.html or
9    * glassfish/bootstrap/legal/CDDLv1.0.txt.
10   * See the License for the specific language governing 
11   * permissions and limitations under the License.
12   * 
13   * When distributing Covered Code, include this CDDL 
14   * Header Notice in each file and include the License file 
15   * at glassfish/bootstrap/legal/CDDLv1.0.txt.  
16   * If applicable, add the following below the CDDL Header, 
17   * with the fields enclosed by brackets [] replaced by
18   * you own identifying information: 
19   * "Portions Copyrighted [year] [name of copyright owner]"
20   * 
21   * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
22   */
23  
24  
25  package com.sun.jdo.api.persistence.enhancer.classfile;
26  
27  import java.util.Hashtable  ;
28  
29  /**
30   * Environment in which to decode the attributes of a CodeAttribute.
31   */
32  
33  class CodeEnv {
34    /* The constant pool */
35    private ConstantPool constantPool;
36  
37    /* hash table mapping byte code offset to InsnTarget */
38    private Hashtable   targets = new Hashtable  (7);
39  
40    CodeEnv(ConstantPool constantPool) {
41      this.constantPool = constantPool;
42    }
43  
44    final InsnTarget getTarget(int offset) {
45      Integer   off = new Integer  (offset);
46      InsnTarget targ = (InsnTarget)targets.get(off);
47      if (targ == null) {
48        targ = new InsnTarget(offset);
49        targets.put(off, targ);
50      }
51      return targ;
52    }
53  
54    final InsnTarget findTarget(int offset) {
55      Integer   off = new Integer  (offset);
56      return (InsnTarget)targets.get(off);
57    }
58  
59    final ConstantPool pool() {
60      return constantPool;
61    }
62  
63  }
64  
65
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