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 Attributes(Map<String, Attribute> attributes) { 73 this.attrs = attributes.values().toArray(new Attribute[attributes.size()]); 74 map = attributes; 75 } 76 77 public Iterator<Attribute> iterator() { 78 return Arrays.asList(attrs).iterator(); 79 } 80 81 public Attribute get(int index) { 82 return attrs[index]; 83 } 84 85 public Attribute get(String name) { 86 return map.get(name); 87 } 88 89 public int getIndex(ConstantPool constant_pool, String name) { 90 for (int i = 0; i < attrs.length; i++) { 91 Attribute attr = attrs[i]; 92 try { 93 if (attr != null && attr.getName(constant_pool).equals(name)) 94 return i; 95 } catch (ConstantPoolException e) { 96 // ignore invalid entries 97 } 98 } 99 return -1; 100 } 101 102 public int size() { 103 return attrs.length; 104 } 105 106 public int byteLength() { 107 int length = 2; 108 for (Attribute a: attrs) 109 length += a.byteLength(); 110 return length; 111 } 112 }