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 
17 package com.android.dexgen.rop;
18 
19 import com.android.dexgen.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  */
25 public 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      */
StdAttributeList(int size)32     public StdAttributeList(int size) {
33         super(size);
34     }
35 
36     /** {@inheritDoc} */
get(int n)37     public Attribute get(int n) {
38         return (Attribute) get0(n);
39     }
40 
41     /** {@inheritDoc} */
byteLength()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} */
findFirst(String name)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} */
findNext(Attribute attrib)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      */
set(int n, Attribute attribute)101     public void set(int n, Attribute attribute) {
102         set0(n, attribute);
103     }
104 }
105