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/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.os;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.stream.IntStream;
/** @hide */
public class HidlSupport {
/**
* Similar to Objects.deepEquals, but also take care of lists.
* Two objects of HIDL types are considered equal if:
* 1. Both null
* 2. Both non-null, and of the same class, and:
* 2.1 Both are primitive arrays / enum arrays, elements are equal using == check
* 2.2 Both are object arrays, elements are checked recursively
* 2.3 Both are Lists, elements are checked recursively
* 2.4 (If both are collections other than lists or maps, throw an error)
* 2.5 lft.equals(rgt) returns true
*/
public static boolean deepEquals(Object lft, Object rgt) {
if (lft == rgt) {
return true;
}
if (lft == null || rgt == null) {
return false;
}
Class<?> lftClazz = lft.getClass();
Class<?> rgtClazz = rgt.getClass();
if (lftClazz != rgtClazz) {
return false;
}
if (lftClazz.isArray()) {
Class<?> lftElementType = lftClazz.getComponentType();
if (lftElementType != rgtClazz.getComponentType()) {
return false;
}
if (lftElementType.isPrimitive()) {
return Objects.deepEquals(lft, rgt);
}
Object[] lftArray = (Object[])lft;
Object[] rgtArray = (Object[])rgt;
return (lftArray.length == rgtArray.length) &&
IntStream.range(0, lftArray.length).allMatch(
i -> deepEquals(lftArray[i], rgtArray[i]));
}
if (lft instanceof List<?>) {
List<Object> lftList = (List<Object>)lft;
List<Object> rgtList = (List<Object>)rgt;
if (lftList.size() != rgtList.size()) {
return false;
}
Iterator<Object> lftIter = lftList.iterator();
return rgtList.stream()
.allMatch(rgtElement -> deepEquals(lftIter.next(), rgtElement));
}
throwErrorIfUnsupportedType(lft);
return lft.equals(rgt);
}
/**
* Similar to Arrays.deepHashCode, but also take care of lists.
*/
public static int deepHashCode(Object o) {
if (o == null) {
return 0;
}
Class<?> clazz = o.getClass();
if (clazz.isArray()) {
Class<?> elementType = clazz.getComponentType();
if (elementType.isPrimitive()) {
return primitiveArrayHashCode(o);
}
return Arrays.hashCode(Arrays.stream((Object[])o)
.mapToInt(element -> deepHashCode(element))
.toArray());
}
if (o instanceof List<?>) {
return Arrays.hashCode(((List<Object>)o).stream()
.mapToInt(element -> deepHashCode(element))
.toArray());
}
throwErrorIfUnsupportedType(o);
return o.hashCode();
}
private static void throwErrorIfUnsupportedType(Object o) {
if (o instanceof Collection<?> && !(o instanceof List<?>)) {
throw new UnsupportedOperationException(
"Cannot check equality on collections other than lists: " +
o.getClass().getName());
}
if (o instanceof Map<?, ?>) {
throw new UnsupportedOperationException(
"Cannot check equality on maps");
}
}
private static int primitiveArrayHashCode(Object o) {
Class<?> elementType = o.getClass().getComponentType();
if (elementType == boolean.class) {
return Arrays.hashCode(((boolean[])o));
}
if (elementType == byte.class) {
return Arrays.hashCode(((byte[])o));
}
if (elementType == char.class) {
return Arrays.hashCode(((char[])o));
}
if (elementType == double.class) {
return Arrays.hashCode(((double[])o));
}
if (elementType == float.class) {
return Arrays.hashCode(((float[])o));
}
if (elementType == int.class) {
return Arrays.hashCode(((int[])o));
}
if (elementType == long.class) {
return Arrays.hashCode(((long[])o));
}
if (elementType == short.class) {
return Arrays.hashCode(((short[])o));
}
// Should not reach here.
throw new UnsupportedOperationException();
}
}
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