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.dexgen.dex.file;
18
19import com.android.dexgen.rop.annotation.Annotations;
20import com.android.dexgen.rop.cst.CstFieldRef;
21import com.android.dexgen.util.AnnotatedOutput;
22import com.android.dexgen.util.Hex;
23import com.android.dexgen.util.ToHuman;
24
25/**
26 * Association of a field and its annotations.
27 */
28public final class FieldAnnotationStruct
29        implements ToHuman, Comparable<FieldAnnotationStruct> {
30    /** {@code non-null;} the field in question */
31    private final CstFieldRef field;
32
33    /** {@code non-null;} the associated annotations */
34    private AnnotationSetItem annotations;
35
36    /**
37     * Constructs an instance.
38     *
39     * @param field {@code non-null;} the field in question
40     * @param annotations {@code non-null;} the associated annotations
41     */
42    public FieldAnnotationStruct(CstFieldRef field,
43            AnnotationSetItem annotations) {
44        if (field == null) {
45            throw new NullPointerException("field == null");
46        }
47
48        if (annotations == null) {
49            throw new NullPointerException("annotations == null");
50        }
51
52        this.field = field;
53        this.annotations = annotations;
54    }
55
56    /** {@inheritDoc} */
57    public int hashCode() {
58        return field.hashCode();
59    }
60
61    /** {@inheritDoc} */
62    public boolean equals(Object other) {
63        if (! (other instanceof FieldAnnotationStruct)) {
64            return false;
65        }
66
67        return field.equals(((FieldAnnotationStruct) other).field);
68    }
69
70    /** {@inheritDoc} */
71    public int compareTo(FieldAnnotationStruct other) {
72        return field.compareTo(other.field);
73    }
74
75    /** {@inheritDoc} */
76    public void addContents(DexFile file) {
77        FieldIdsSection fieldIds = file.getFieldIds();
78        MixedItemSection wordData = file.getWordData();
79
80        fieldIds.intern(field);
81        annotations = wordData.intern(annotations);
82    }
83
84    /** {@inheritDoc} */
85    public void writeTo(DexFile file, AnnotatedOutput out) {
86        int fieldIdx = file.getFieldIds().indexOf(field);
87        int annotationsOff = annotations.getAbsoluteOffset();
88
89        if (out.annotates()) {
90            out.annotate(0, "    " + field.toHuman());
91            out.annotate(4, "      field_idx:       " + Hex.u4(fieldIdx));
92            out.annotate(4, "      annotations_off: " +
93                    Hex.u4(annotationsOff));
94        }
95
96        out.writeInt(fieldIdx);
97        out.writeInt(annotationsOff);
98    }
99
100    /** {@inheritDoc} */
101    public String toHuman() {
102        return field.toHuman() + ": " + annotations;
103    }
104
105    /**
106     * Gets the field this item is for.
107     *
108     * @return {@code non-null;} the field
109     */
110    public CstFieldRef getField() {
111        return field;
112    }
113
114    /**
115     * Gets the associated annotations.
116     *
117     * @return {@code non-null;} the annotations
118     */
119    public Annotations getAnnotations() {
120        return annotations.getAnnotations();
121    }
122}
123