// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
// https://developers.google.com/protocol-buffers/
//
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//
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// notice, this list of conditions and the following disclaimer.
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// distribution.
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package com.google.protobuf;
import com.google.protobuf.Internal.BooleanList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.RandomAccess;
/**
* An implementation of {@link BooleanList} on top of a primitive array.
*
* @author dweis@google.com (Daniel Weis)
*/
final class BooleanArrayList
extends AbstractProtobufList<Boolean> implements BooleanList, RandomAccess {
private static final int DEFAULT_CAPACITY = 10;
private static final BooleanArrayList EMPTY_LIST = new BooleanArrayList();
static {
EMPTY_LIST.makeImmutable();
}
public static BooleanArrayList emptyList() {
return EMPTY_LIST;
}
/**
* The backing store for the list.
*/
private boolean[] array;
/**
* The size of the list distinct from the length of the array. That is, it is the number of
* elements set in the list.
*/
private int size;
/**
* Constructs a new mutable {@code BooleanArrayList} with default capacity.
*/
BooleanArrayList() {
this(DEFAULT_CAPACITY);
}
/**
* Constructs a new mutable {@code BooleanArrayList} with the provided capacity.
*/
BooleanArrayList(int capacity) {
array = new boolean[capacity];
size = 0;
}
/**
* Constructs a new mutable {@code BooleanArrayList} containing the same elements as
* {@code other}.
*/
BooleanArrayList(List<Boolean> other) {
if (other instanceof BooleanArrayList) {
BooleanArrayList list = (BooleanArrayList) other;
array = list.array.clone();
size = list.size;
} else {
size = other.size();
array = new boolean[size];
for (int i = 0; i < size; i++) {
array[i] = other.get(i);
}
}
}
@Override
public Boolean get(int index) {
return getBoolean(index);
}
@Override
public boolean getBoolean(int index) {
ensureIndexInRange(index);
return array[index];
}
@Override
public int size() {
return size;
}
@Override
public Boolean set(int index, Boolean element) {
return setBoolean(index, element);
}
@Override
public boolean setBoolean(int index, boolean element) {
ensureIsMutable();
ensureIndexInRange(index);
boolean previousValue = array[index];
array[index] = element;
return previousValue;
}
@Override
public void add(int index, Boolean element) {
addBoolean(index, element);
}
/**
* Like {@link #add(Boolean)} but more efficient in that it doesn't box the element.
*/
@Override
public void addBoolean(boolean element) {
addBoolean(size, element);
}
/**
* Like {@link #add(int, Boolean)} but more efficient in that it doesn't box the element.
*/
private void addBoolean(int index, boolean element) {
ensureIsMutable();
if (index < 0 || index > size) {
throw new IndexOutOfBoundsException(makeOutOfBoundsExceptionMessage(index));
}
if (size < array.length) {
// Shift everything over to make room
System.arraycopy(array, index, array, index + 1, size - index);
} else {
// Resize to 1.5x the size
int length = ((size * 3) / 2) + 1;
boolean[] newArray = new boolean[length];
// Copy the first part directly
System.arraycopy(array, 0, newArray, 0, index);
// Copy the rest shifted over by one to make room
System.arraycopy(array, index, newArray, index + 1, size - index);
array = newArray;
}
array[index] = element;
size++;
modCount++;
}
@Override
public boolean addAll(Collection<? extends Boolean> collection) {
ensureIsMutable();
if (collection == null) {
throw new NullPointerException();
}
// We specialize when adding another BooleanArrayList to avoid boxing elements.
if (!(collection instanceof BooleanArrayList)) {
return super.addAll(collection);
}
BooleanArrayList list = (BooleanArrayList) collection;
if (list.size == 0) {
return false;
}
int overflow = Integer.MAX_VALUE - size;
if (overflow < list.size) {
// We can't actually represent a list this large.
throw new OutOfMemoryError();
}
int newSize = size + list.size;
if (newSize > array.length) {
array = Arrays.copyOf(array, newSize);
}
System.arraycopy(list.array, 0, array, size, list.size);
size = newSize;
modCount++;
return true;
}
@Override
public boolean remove(Object o) {
ensureIsMutable();
for (int i = 0; i < size; i++) {
if (o.equals(array[i])) {
System.arraycopy(array, i + 1, array, i, size - i);
size--;
modCount++;
return true;
}
}
return false;
}
@Override
public Boolean remove(int index) {
ensureIsMutable();
ensureIndexInRange(index);
boolean value = array[index];
System.arraycopy(array, index + 1, array, index, size - index);
size--;
modCount++;
return value;
}
/**
* Ensures that the provided {@code index} is within the range of {@code [0, size]}. Throws an
* {@link IndexOutOfBoundsException} if it is not.
*
* @param index the index to verify is in range
*/
private void ensureIndexInRange(int index) {
if (index < 0 || index >= size) {
throw new IndexOutOfBoundsException(makeOutOfBoundsExceptionMessage(index));
}
}
private String makeOutOfBoundsExceptionMessage(int index) {
return "Index:" + index + ", Size:" + size;
}
}
