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.dexgen.rop;
18
19import com.android.dexgen.rop.cst.CstNat;
20import com.android.dexgen.rop.cst.CstType;
21import com.android.dexgen.rop.cst.CstUtf8;
22import com.android.dexgen.rop.cst.TypedConstant;
23
24/**
25 * Standard implementation of {@link Field}, which directly stores
26 * all the associated data.
27 */
28public final class StdField extends StdMember implements Field {
29    /**
30     * Constructs an instance.
31     *
32     * @param definingClass {@code non-null;} the defining class
33     * @param accessFlags access flags
34     * @param nat {@code non-null;} member name and type (descriptor)
35     * @param attributes {@code non-null;} list of associated attributes
36     */
37    public StdField(CstType definingClass, int accessFlags, CstNat nat,
38                    AttributeList attributes) {
39        super(definingClass, accessFlags, nat, attributes);
40    }
41
42    /**
43     * Constructs an instance having Java field as its pattern.
44     *
45     * @param field {@code non-null;} pattern for dex field
46     */
47    public StdField(java.lang.reflect.Field field) {
48        this(CstType.intern(field.getDeclaringClass()),
49                field.getModifiers(),
50                new CstNat(new CstUtf8(field.getName()),
51                        CstType.intern(field.getType()).getDescriptor()),
52                new StdAttributeList(0));
53    }
54
55    /**
56     * Constructs an instance taking field description as user-friendly arguments.
57     *
58     * @param declaringClass {@code non-null;} the class field belongs to
59     * @param type {@code non-null;} type of the field
60     * @param name {@code non-null;} name of the field
61     * @param modifiers access flags of the field
62     */
63    public StdField(Class definingClass, Class type, String name, int modifiers) {
64        this(CstType.intern(definingClass),
65                modifiers,
66                new CstNat(new CstUtf8(name), CstType.intern(type).getDescriptor()),
67                new StdAttributeList(0));
68    }
69
70    /** {@inheritDoc} */
71    public TypedConstant getConstantValue() {
72        AttributeList attribs = getAttributes();
73        AttConstantValue cval = (AttConstantValue)
74            attribs.findFirst(AttConstantValue.ATTRIBUTE_NAME);
75
76        if (cval == null) {
77            return null;
78        }
79
80        return cval.getConstantValue();
81    }
82}