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/*
* 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.common.collect;
import com.google.common.annotations.GwtCompatible;
import com.google.common.base.Preconditions;
import java.util.List;
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<E> extends ImmutableList<E> {
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 public boolean isEmpty() {
return false;
}
@Override boolean isPartialView() {
return offset != 0 || size != array.length;
}
@Override public Object[] toArray() {
Object[] newArray = new Object[size()];
System.arraycopy(array, offset, newArray, 0, size);
return newArray;
}
@Override public <T> T[] toArray(T[] other) {
if (other.length < size) {
other = ObjectArrays.newArray(other, size);
} else if (other.length > size) {
other[size] = null;
}
System.arraycopy(array, offset, other, 0, size);
return other;
}
// 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
ImmutableList<E> subListUnchecked(int fromIndex, int toIndex) {
return new RegularImmutableList<E>(
array, offset + fromIndex, toIndex - fromIndex);
}
@SuppressWarnings("unchecked")
@Override
public UnmodifiableListIterator<E> listIterator(int index) {
// for performance
// The fake cast to E is safe because the creation methods only allow E's
return (UnmodifiableListIterator<E>)
Iterators.forArray(array, offset, size, index);
}
@Override public boolean equals(@Nullable Object object) {
if (object == this) {
return true;
}
if (!(object instanceof List)) {
return false;
}
List<?> that = (List<?>) object;
if (this.size() != that.size()) {
return false;
}
int index = offset;
if (object instanceof RegularImmutableList) {
RegularImmutableList<?> other = (RegularImmutableList<?>) object;
for (int i = other.offset; i < other.offset + other.size; i++) {
if (!array[index++].equals(other.array[i])) {
return false;
}
}
} else {
for (Object element : that) {
if (!array[index++].equals(element)) {
return false;
}
}
}
return true;
}
@Override public String toString() {
StringBuilder sb = Collections2.newStringBuilderForCollection(size())
.append('[').append(array[offset]);
for (int i = offset + 1; i < offset + size; i++) {
sb.append(", ").append(array[i]);
}
return sb.append(']').toString();
}
}
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