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.dex.file;
18
19import com.android.dx.rop.type.StdTypeList;
20import com.android.dx.rop.type.Type;
21import com.android.dx.rop.type.TypeList;
22import com.android.dx.util.AnnotatedOutput;
23import com.android.dx.util.Hex;
24
25/**
26 * Representation of a list of class references.
27 */
28public final class TypeListItem extends OffsettedItem {
29    /** alignment requirement */
30    private static final int ALIGNMENT = 4;
31
32    /** element size in bytes */
33    private static final int ELEMENT_SIZE = 2;
34
35    /** header size in bytes */
36    private static final int HEADER_SIZE = 4;
37
38    /** {@code non-null;} the actual list */
39    private final TypeList list;
40
41    /**
42     * Constructs an instance.
43     *
44     * @param list {@code non-null;} the actual list
45     */
46    public TypeListItem(TypeList list) {
47        super(ALIGNMENT, (list.size() * ELEMENT_SIZE) + HEADER_SIZE);
48
49        this.list = list;
50    }
51
52    /** {@inheritDoc} */
53    @Override
54    public int hashCode() {
55        return StdTypeList.hashContents(list);
56    }
57
58    /** {@inheritDoc} */
59    @Override
60    public ItemType itemType() {
61        return ItemType.TYPE_TYPE_LIST;
62    }
63
64    /** {@inheritDoc} */
65    public void addContents(DexFile file) {
66        TypeIdsSection typeIds = file.getTypeIds();
67        int sz = list.size();
68
69        for (int i = 0; i < sz; i++) {
70            typeIds.intern(list.getType(i));
71        }
72    }
73
74    /** {@inheritDoc} */
75    @Override
76    public String toHuman() {
77        throw new RuntimeException("unsupported");
78    }
79
80    /**
81     * Gets the underlying list.
82     *
83     * @return {@code non-null;} the list
84     */
85    public TypeList getList() {
86        return list;
87    }
88
89    /** {@inheritDoc} */
90    @Override
91    protected void writeTo0(DexFile file, AnnotatedOutput out) {
92        TypeIdsSection typeIds = file.getTypeIds();
93        int sz = list.size();
94
95        if (out.annotates()) {
96            out.annotate(0, offsetString() + " type_list");
97            out.annotate(HEADER_SIZE, "  size: " + Hex.u4(sz));
98            for (int i = 0; i < sz; i++) {
99                Type one = list.getType(i);
100                int idx = typeIds.indexOf(one);
101                out.annotate(ELEMENT_SIZE,
102                             "  " + Hex.u2(idx) + " // " + one.toHuman());
103            }
104        }
105
106        out.writeInt(sz);
107
108        for (int i = 0; i < sz; i++) {
109            out.writeShort(typeIds.indexOf(list.getType(i)));
110        }
111    }
112
113    /** {@inheritDoc} */
114    @Override
115    protected int compareTo0(OffsettedItem other) {
116        TypeList thisList = this.list;
117        TypeList otherList = ((TypeListItem) other).list;
118
119        return StdTypeList.compareContents(thisList, otherList);
120    }
121}
122