1/*
2 * Copyright (C) 2007 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.dx.cf.iface;
18
19import com.android.dx.util.FixedSizeList;
20
21/**
22 * Standard implementation of {@link AttributeList}, which directly stores
23 * an array of {@link Attribute} objects and can be made immutable.
24 */
25public final class StdAttributeList extends FixedSizeList
26        implements AttributeList {
27    /**
28     * Constructs an instance. All indices initially contain {@code null}.
29     *
30     * @param size the size of the list
31     */
32    public StdAttributeList(int size) {
33        super(size);
34    }
35
36    /** {@inheritDoc} */
37    public Attribute get(int n) {
38        return (Attribute) get0(n);
39    }
40
41    /** {@inheritDoc} */
42    public int byteLength() {
43        int sz = size();
44        int result = 2; // u2 attributes_count
45
46        for (int i = 0; i < sz; i++) {
47            result += get(i).byteLength();
48        }
49
50        return result;
51    }
52
53    /** {@inheritDoc} */
54    public Attribute findFirst(String name) {
55        int sz = size();
56
57        for (int i = 0; i < sz; i++) {
58            Attribute att = get(i);
59            if (att.getName().equals(name)) {
60                return att;
61            }
62        }
63
64        return null;
65    }
66
67    /** {@inheritDoc} */
68    public Attribute findNext(Attribute attrib) {
69        int sz = size();
70        int at;
71
72        outer: {
73            for (at = 0; at < sz; at++) {
74                Attribute att = get(at);
75                if (att == attrib) {
76                    break outer;
77                }
78            }
79
80            return null;
81        }
82
83        String name = attrib.getName();
84
85        for (at++; at < sz; at++) {
86            Attribute att = get(at);
87            if (att.getName().equals(name)) {
88                return att;
89            }
90        }
91
92        return null;
93    }
94
95    /**
96     * Sets the attribute at the given index.
97     *
98     * @param n {@code >= 0, < size();} which attribute
99     * @param attribute {@code null-ok;} the attribute object
100     */
101    public void set(int n, Attribute attribute) {
102        set0(n, attribute);
103    }
104}
105