com.google.gwt.thirdparty.guava.common.collect.RegularImmutableList Maven / Gradle / Ivy
/*
* Copyright (C) 2009 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.gwt.thirdparty.guava.common.collect;
import com.google.gwt.thirdparty.guava.common.annotations.GwtCompatible;
import com.google.gwt.thirdparty.guava.common.base.Preconditions;
import javax.annotation.Nullable;
/**
* Implementation of {@link ImmutableList} with one or more elements.
*
* @author Kevin Bourrillion
*/
@GwtCompatible(serializable = true, emulated = true)
@SuppressWarnings("serial") // uses writeReplace(), not default serialization
class RegularImmutableList extends ImmutableList {
private final transient int offset;
private final transient int size;
private final transient Object[] array;
RegularImmutableList(Object[] array, int offset, int size) {
this.offset = offset;
this.size = size;
this.array = array;
}
RegularImmutableList(Object[] array) {
this(array, 0, array.length);
}
@Override
public int size() {
return size;
}
@Override boolean isPartialView() {
return size != array.length;
}
@Override
int copyIntoArray(Object[] dst, int dstOff) {
System.arraycopy(array, offset, dst, dstOff, size);
return dstOff + size;
}
// The fake cast to E is safe because the creation methods only allow E's
@Override
@SuppressWarnings("unchecked")
public E get(int index) {
Preconditions.checkElementIndex(index, size);
return (E) array[index + offset];
}
@Override
public int indexOf(@Nullable Object object) {
if (object == null) {
return -1;
}
for (int i = 0; i < size; i++) {
if (array[offset + i].equals(object)) {
return i;
}
}
return -1;
}
@Override
public int lastIndexOf(@Nullable Object object) {
if (object == null) {
return -1;
}
for (int i = size - 1; i >= 0; i--) {
if (array[offset + i].equals(object)) {
return i;
}
}
return -1;
}
@Override
ImmutableList subListUnchecked(int fromIndex, int toIndex) {
return new RegularImmutableList(
array, offset + fromIndex, toIndex - fromIndex);
}
@SuppressWarnings("unchecked")
@Override
public UnmodifiableListIterator listIterator(int index) {
// for performance
// The fake cast to E is safe because the creation methods only allow E's
return (UnmodifiableListIterator)
Iterators.forArray(array, offset, size, index);
}
// TODO(user): benchmark optimizations for equals() and see if they're worthwhile
}