ProtoIdsSection.java revision 579d7739c53a2707ad711a2d2cae46d7d782f061 
1/*
2 * Copyright (C) 2008 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.dex.file;
18
19import com.android.dx.rop.cst.Constant;
20import com.android.dx.rop.type.Prototype;
21import com.android.dx.util.AnnotatedOutput;
22import com.android.dx.util.Hex;
23
24import java.util.Collection;
25import java.util.TreeMap;
26
27/**
28 * Proto (method prototype) identifiers list section of a
29 * {@code .dex} file.
30 */
31public final class ProtoIdsSection extends UniformItemSection {
32    /**
33     * {@code non-null;} map from method prototypes to {@link ProtoIdItem} instances
34     */
35    private final TreeMap<Prototype, ProtoIdItem> protoIds;
36
37    /**
38     * Constructs an instance. The file offset is initially unknown.
39     *
40     * @param file {@code non-null;} file that this instance is part of
41     */
42    public ProtoIdsSection(DexFile file) {
43        super("proto_ids", file, 4);
44
45        protoIds = new TreeMap<Prototype, ProtoIdItem>();
46    }
47
48    /** {@inheritDoc} */
49    @Override
50    public Collection<? extends Item> items() {
51        return protoIds.values();
52    }
53
54    /** {@inheritDoc} */
55    @Override
56    public IndexedItem get(Constant cst) {
57        throw new UnsupportedOperationException("unsupported");
58    }
59
60    /**
61     * Writes the portion of the file header that refers to this instance.
62     *
63     * @param out {@code non-null;} where to write
64     */
65    public void writeHeaderPart(AnnotatedOutput out) {
66        throwIfNotPrepared();
67
68        int sz = protoIds.size();
69        int offset = (sz == 0) ? 0 : getFileOffset();
70
71        if (sz > 65536) {
72            throw new UnsupportedOperationException("too many proto ids");
73        }
74
75        if (out.annotates()) {
76            out.annotate(4, "proto_ids_size:  " + Hex.u4(sz));
77            out.annotate(4, "proto_ids_off:   " + Hex.u4(offset));
78        }
79
80        out.writeInt(sz);
81        out.writeInt(offset);
82    }
83
84    /**
85     * Interns an element into this instance.
86     *
87     * @param prototype {@code non-null;} the prototype to intern
88     * @return {@code non-null;} the interned reference
89     */
90    public ProtoIdItem intern(Prototype prototype) {
91        if (prototype == null) {
92            throw new NullPointerException("prototype == null");
93        }
94
95        throwIfPrepared();
96
97        ProtoIdItem result = protoIds.get(prototype);
98
99        if (result == null) {
100            result = new ProtoIdItem(prototype);
101            protoIds.put(prototype, result);
102        }
103
104        return result;
105    }
106
107    /**
108     * Gets the index of the given prototype, which must have
109     * been added to this instance.
110     *
111     * @param prototype {@code non-null;} the prototype to look up
112     * @return {@code >= 0;} the reference's index
113     */
114    public int indexOf(Prototype prototype) {
115        if (prototype == null) {
116            throw new NullPointerException("prototype == null");
117        }
118
119        throwIfNotPrepared();
120
121        ProtoIdItem item = protoIds.get(prototype);
122
123        if (item == null) {
124            throw new IllegalArgumentException("not found");
125        }
126
127        return item.getIndex();
128    }
129
130    /** {@inheritDoc} */
131    @Override
132    protected void orderItems() {
133        int idx = 0;
134
135        for (Object i : items()) {
136            ((ProtoIdItem) i).setIndex(idx);
137            idx++;
138        }
139    }
140}
141