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// Copyright (c) 2017, the R8 project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
package com.android.tools.r8.utils;
import com.android.tools.r8.graph.DexMethod;
import com.google.common.base.Equivalence;
/**
* Implements an equivalence on {@link DexMethod} that does not take the holder nor return type into
* account.
*
* <p>Useful when deciding whether methods shadow each other wrt. Java semantics.
*/
public class MethodJavaSignatureEquivalence extends Equivalence<DexMethod> {
private static final MethodJavaSignatureEquivalence INSTANCE =
new MethodJavaSignatureEquivalence(false);
private static final MethodJavaSignatureEquivalence INSTANCE_IGNORE_NAME =
new MethodJavaSignatureEquivalence(true);
private final boolean ignoreName;
private MethodJavaSignatureEquivalence(boolean ignoreName) {
this.ignoreName = ignoreName;
}
public static MethodJavaSignatureEquivalence get() {
return INSTANCE;
}
public static MethodJavaSignatureEquivalence getEquivalenceIgnoreName() {
return INSTANCE_IGNORE_NAME;
}
@Override
protected boolean doEquivalent(DexMethod a, DexMethod b) {
if (ignoreName) {
return a.proto.parameters.equals(b.proto.parameters);
}
return a.name.equals(b.name) && a.proto.parameters.equals(b.proto.parameters);
}
@Override
protected int doHash(DexMethod method) {
if (ignoreName) {
return method.proto.parameters.hashCode();
}
return method.name.hashCode() * 31 + method.proto.parameters.hashCode();
}
}