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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 javax.annotation.CheckForNull;
import org.checkerframework.checker.nullness.qual.Nullable;
/**
* Implementation of {@link ImmutableSet} with two or more elements.
*
* @author Kevin Bourrillion
*/
@GwtCompatible(serializable = true, emulated = true)
@SuppressWarnings("serial") // uses writeReplace(), not default serialization
@ElementTypesAreNonnullByDefault
final class RegularImmutableSet<E> extends ImmutableSet<E> {
private static final Object[] EMPTY_ARRAY = new Object[0];
static final RegularImmutableSet<Object> EMPTY =
new RegularImmutableSet<>(EMPTY_ARRAY, 0, EMPTY_ARRAY, 0, 0);
// The first `size` elements are non-null.
@VisibleForTesting final transient @Nullable Object[] elements;
private final transient int hashCode;
// the same values as `elements` in hashed positions (plus nulls)
@VisibleForTesting final transient @Nullable Object[] table;
// 'and' with an int to get a valid table index.
private final transient int mask;
private final transient int size;
RegularImmutableSet(
@Nullable Object[] elements, int hashCode, @Nullable Object[] table, int mask, int size) {
this.elements = elements;
this.hashCode = hashCode;
this.table = table;
this.mask = mask;
this.size = size;
}
@Override
public boolean contains(@CheckForNull Object target) {
@Nullable Object[] table = this.table;
if (target == null || table.length == 0) {
return false;
}
for (int i = Hashing.smearedHash(target); ; i++) {
i &= mask;
Object candidate = table[i];
if (candidate == null) {
return false;
} else if (candidate.equals(target)) {
return true;
}
}
}
@Override
public int size() {
return size;
}
@Override
public UnmodifiableIterator<E> iterator() {
return asList().iterator();
}
@Override
@Nullable
Object[] internalArray() {
return elements;
}
@Override
int internalArrayStart() {
return 0;
}
@Override
int internalArrayEnd() {
return size;
}
@Override
int copyIntoArray(@Nullable Object[] dst, int offset) {
System.arraycopy(elements, 0, dst, offset, size);
return offset + size;
}
@Override
ImmutableList<E> createAsList() {
return ImmutableList.asImmutableList(elements, size);
}
@Override
boolean isPartialView() {
return false;
}
@Override
public int hashCode() {
return hashCode;
}
@Override
boolean isHashCodeFast() {
return true;
}
}
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