1 /*
   2  * Copyright (c) 2007, 2008, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package com.sun.tools.classfile;
  27 
  28 import java.io.IOException;
  29 import java.util.Arrays;
  30 import java.util.HashMap;
  31 import java.util.Iterator;
  32 import java.util.Map;
  33 
  34 /*
  35  *  <p><b>This is NOT part of any supported API.
  36  *  If you write code that depends on this, you do so at your own risk.
  37  *  This code and its internal interfaces are subject to change or
  38  *  deletion without notice.</b>
  39  */
  40 public class Attributes implements Iterable<Attribute> {
  41 
  42     public final Attribute[] attrs;
  43     public final Map<String, Attribute> map;
  44 
  45     Attributes(ClassReader cr) throws IOException {
  46         map = new HashMap<>();
  47         int attrs_count = cr.readUnsignedShort();
  48         attrs = new Attribute[attrs_count];
  49         for (int i = 0; i < attrs_count; i++) {
  50             Attribute attr = Attribute.read(cr);
  51             attrs[i] = attr;
  52             try {
  53                 map.put(attr.getName(cr.getConstantPool()), attr);
  54             } catch (ConstantPoolException e) {
  55                 // don't enter invalid names in map
  56             }
  57         }
  58     }
  59 
  60     public Attributes(ConstantPool constant_pool, Attribute[] attrs) {
  61         this.attrs = attrs;
  62         map = new HashMap<>();
  63         for (Attribute attr : attrs) {
  64             try {
  65                 map.put(attr.getName(constant_pool), attr);
  66             } catch (ConstantPoolException e) {
  67                 // don't enter invalid names in map
  68             }
  69         }
  70     }
  71 
  72     public Iterator<Attribute> iterator() {
  73         return Arrays.asList(attrs).iterator();
  74     }
  75 
  76     public Attribute get(int index) {
  77         return attrs[index];
  78     }
  79 
  80     public Attribute get(String name) {
  81         return map.get(name);
  82     }
  83 
  84     public int getIndex(ConstantPool constant_pool, String name) {
  85         for (int i = 0; i < attrs.length; i++) {
  86             Attribute attr = attrs[i];
  87             try {
  88                 if (attr != null && attr.getName(constant_pool).equals(name))
  89                     return i;
  90             } catch (ConstantPoolException e) {
  91                 // ignore invalid entries
  92             }
  93         }
  94         return -1;
  95     }
  96 
  97     public int size() {
  98         return attrs.length;
  99     }
 100 
 101     public int byteLength() {
 102         int length = 2;
 103         for (Attribute a: attrs)
 104             length += a.byteLength();
 105         return length;
 106     }
 107 }