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/*
* Copyright (C) 2007 The Guava Authors
*
* 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 com.google.common.collect;
import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.ImmutableSet.ArrayImmutableSet;
/**
* Implementation of {@link ImmutableSet} with two or more elements.
*
* @author Kevin Bourrillion
*/
@GwtCompatible(serializable = true, emulated = true)
@SuppressWarnings("serial") // uses writeReplace(), not default serialization
final class RegularImmutableSet<E> extends ArrayImmutableSet<E> {
// the same elements in hashed positions (plus nulls)
@VisibleForTesting final transient Object[] table;
// 'and' with an int to get a valid table index.
private final transient int mask;
private final transient int hashCode;
RegularImmutableSet(
Object[] elements, int hashCode, Object[] table, int mask) {
super(elements);
this.table = table;
this.mask = mask;
this.hashCode = hashCode;
}
@Override public boolean contains(Object target) {
if (target == null) {
return false;
}
for (int i = Hashing.smear(target.hashCode()); true; i++) {
Object candidate = table[i & mask];
if (candidate == null) {
return false;
}
if (candidate.equals(target)) {
return true;
}
}
}
@Override public int hashCode() {
return hashCode;
}
@Override boolean isHashCodeFast() {
return true;
}
}
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