MethodId.java revision c0271e9981ddd85a13ed88defd0b5b1a5ccc6f46 
1/*
2 * Copyright (C) 2011 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.google.dexmaker;
18
19import com.android.dx.rop.cst.CstMethodRef;
20import com.android.dx.rop.cst.CstNat;
21import com.android.dx.rop.cst.CstString;
22import com.android.dx.rop.type.Prototype;
23import java.util.List;
24
25/**
26 * Identifies a method or constructor.
27 */
28public final class MethodId<D, R> {
29    final TypeId<D> declaringType;
30    final TypeId<R> returnType;
31    final String name;
32    final TypeList parameters;
33
34    /** cached converted state */
35    final CstNat nat;
36    final CstMethodRef constant;
37
38    MethodId(TypeId<D> declaringType, TypeId<R> returnType, String name, TypeList parameters) {
39        if (declaringType == null || returnType == null || name == null || parameters == null) {
40            throw new NullPointerException();
41        }
42        this.declaringType = declaringType;
43        this.returnType = returnType;
44        this.name = name;
45        this.parameters = parameters;
46        this.nat = new CstNat(new CstString(name), new CstString(descriptor(false)));
47        this.constant = new CstMethodRef(declaringType.constant, nat);
48    }
49
50    public TypeId<D> getDeclaringType() {
51        return declaringType;
52    }
53
54    public TypeId<R> getReturnType() {
55        return returnType;
56    }
57
58    /**
59     * Returns true if this method is a constructor for its declaring class.
60     */
61    public boolean isConstructor() {
62        return name.equals("<init>");
63    }
64
65    /**
66     * Returns the method's name. This is "<init>" if this is a constructor.
67     */
68    public String getName() {
69        return name;
70    }
71
72    public List<TypeId<?>> getParameters() {
73        return parameters.asList();
74    }
75
76    /**
77     * Returns a descriptor like "(Ljava/lang/Class;[I)Ljava/lang/Object;".
78     */
79    String descriptor(boolean includeThis) {
80        StringBuilder result = new StringBuilder();
81        result.append("(");
82        if (includeThis) {
83            result.append(declaringType.name);
84        }
85        for (TypeId t : parameters.types) {
86            result.append(t.name);
87        }
88        result.append(")");
89        result.append(returnType.name);
90        return result.toString();
91    }
92
93    Prototype prototype(boolean includeThis) {
94        return Prototype.intern(descriptor(includeThis));
95    }
96
97    @Override public boolean equals(Object o) {
98        return o instanceof MethodId
99                && ((MethodId<?, ?>) o).declaringType.equals(declaringType)
100                && ((MethodId<?, ?>) o).name.equals(name)
101                && ((MethodId<?, ?>) o).parameters.equals(parameters)
102                && ((MethodId<?, ?>) o).returnType.equals(returnType);
103    }
104
105    @Override public int hashCode() {
106        int result = 17;
107        result = 31 * result + declaringType.hashCode();
108        result = 31 * result + name.hashCode();
109        result = 31 * result + parameters.hashCode();
110        result = 31 * result + returnType.hashCode();
111        return result;
112    }
113
114    @Override public String toString() {
115        return declaringType + "." + name + "(" + parameters + ")";
116    }
117}
118