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
26package com.sun.tools.classfile;
27
28import java.io.IOException;
29import java.util.Arrays;
30import java.util.HashMap;
31import java.util.Iterator;
32import 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 */
40public 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}
113