| // 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.DexField; |
| import com.google.common.base.Equivalence; |
| |
| /** |
| * Implements an equivalence on {@link DexField} that does not take the holder into account. |
| * |
| * <p>Useful when comparing method implementations by their signature only. |
| */ |
| public class FieldSignatureEquivalence extends Equivalence<DexField> { |
| |
| private static final FieldSignatureEquivalence INSTANCE = new FieldSignatureEquivalence(false); |
| |
| private static final FieldSignatureEquivalence INSTANCE_IGNORE_NAME = |
| new FieldSignatureEquivalence(true); |
| |
| private final boolean ignoreName; |
| |
| private FieldSignatureEquivalence(boolean ignoreName) { |
| this.ignoreName = ignoreName; |
| } |
| |
| public static FieldSignatureEquivalence get() { |
| return INSTANCE; |
| } |
| |
| public static FieldSignatureEquivalence getEquivalenceIgnoreName() { |
| return INSTANCE_IGNORE_NAME; |
| } |
| |
| @Override |
| protected boolean doEquivalent(DexField a, DexField b) { |
| if (ignoreName) { |
| return a.type.equals(b.type); |
| } |
| return a.name.equals(b.name) && a.type.equals(b.type); |
| } |
| |
| @Override |
| protected int doHash(DexField field) { |
| if (ignoreName) { |
| return field.type.hashCode(); |
| } |
| return field.name.hashCode() * 31 + field.type.hashCode(); |
| } |
| } |