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      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 
     17 package com.google.dexmaker;
     18 
     19 import com.android.dx.rop.cst.CstMethodRef;
     20 import com.android.dx.rop.cst.CstNat;
     21 import com.android.dx.rop.cst.CstString;
     22 import com.android.dx.rop.type.Prototype;
     23 import java.util.List;
     24 
     25 /**
     26  * Identifies a method or constructor.
     27  *
     28  * @param <D> the type declaring this field
     29  * @param <R> the return type of this method
     30  */
     31 public final class MethodId<D, R> {
     32     final TypeId<D> declaringType;
     33     final TypeId<R> returnType;
     34     final String name;
     35     final TypeList parameters;
     36 
     37     /** cached converted state */
     38     final CstNat nat;
     39     final CstMethodRef constant;
     40 
     41     MethodId(TypeId<D> declaringType, TypeId<R> returnType, String name, TypeList parameters) {
     42         if (declaringType == null || returnType == null || name == null || parameters == null) {
     43             throw new NullPointerException();
     44         }
     45         this.declaringType = declaringType;
     46         this.returnType = returnType;
     47         this.name = name;
     48         this.parameters = parameters;
     49         this.nat = new CstNat(new CstString(name), new CstString(descriptor(false)));
     50         this.constant = new CstMethodRef(declaringType.constant, nat);
     51     }
     52 
     53     public TypeId<D> getDeclaringType() {
     54         return declaringType;
     55     }
     56 
     57     public TypeId<R> getReturnType() {
     58         return returnType;
     59     }
     60 
     61     /**
     62      * Returns true if this method is a constructor for its declaring class.
     63      */
     64     public boolean isConstructor() {
     65         return name.equals("<init>");
     66     }
     67 
     68     /**
     69      * Returns the method's name. This is "<init>" if this is a constructor.
     70      */
     71     public String getName() {
     72         return name;
     73     }
     74 
     75     public List<TypeId<?>> getParameters() {
     76         return parameters.asList();
     77     }
     78 
     79     /**
     80      * Returns a descriptor like "(Ljava/lang/Class;[I)Ljava/lang/Object;".
     81      */
     82     String descriptor(boolean includeThis) {
     83         StringBuilder result = new StringBuilder();
     84         result.append("(");
     85         if (includeThis) {
     86             result.append(declaringType.name);
     87         }
     88         for (TypeId t : parameters.types) {
     89             result.append(t.name);
     90         }
     91         result.append(")");
     92         result.append(returnType.name);
     93         return result.toString();
     94     }
     95 
     96     Prototype prototype(boolean includeThis) {
     97         return Prototype.intern(descriptor(includeThis));
     98     }
     99 
    100     @Override public boolean equals(Object o) {
    101         return o instanceof MethodId
    102                 && ((MethodId<?, ?>) o).declaringType.equals(declaringType)
    103                 && ((MethodId<?, ?>) o).name.equals(name)
    104                 && ((MethodId<?, ?>) o).parameters.equals(parameters)
    105                 && ((MethodId<?, ?>) o).returnType.equals(returnType);
    106     }
    107 
    108     @Override public int hashCode() {
    109         int result = 17;
    110         result = 31 * result + declaringType.hashCode();
    111         result = 31 * result + name.hashCode();
    112         result = 31 * result + parameters.hashCode();
    113         result = 31 * result + returnType.hashCode();
    114         return result;
    115     }
    116 
    117     @Override public String toString() {
    118         return declaringType + "." + name + "(" + parameters + ")";
    119     }
    120 }
    121