src.android.util.LongArray Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of android-all Show documentation
Show all versions of android-all Show documentation
A library jar that provides APIs for Applications written for the Google Android Platform.
/*
* Copyright (C) 2013 The Android Open Source Project
*
* 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 android.util;
import android.annotation.Nullable;
import android.compat.annotation.UnsupportedAppUsage;
import android.os.Build;
import com.android.internal.util.ArrayUtils;
import com.android.internal.util.Preconditions;
import libcore.util.EmptyArray;
import java.util.Arrays;
/**
* Implements a growing array of long primitives.
*
* @hide
*/
public class LongArray implements Cloneable {
private static final int MIN_CAPACITY_INCREMENT = 12;
private long[] mValues;
private int mSize;
private LongArray(long[] array, int size) {
mValues = array;
mSize = Preconditions.checkArgumentInRange(size, 0, array.length, "size");
}
/**
* Creates an empty LongArray with the default initial capacity.
*/
@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
public LongArray() {
this(10);
}
/**
* Creates an empty LongArray with the specified initial capacity.
*/
public LongArray(int initialCapacity) {
if (initialCapacity == 0) {
mValues = EmptyArray.LONG;
} else {
mValues = ArrayUtils.newUnpaddedLongArray(initialCapacity);
}
mSize = 0;
}
/**
* Creates an LongArray wrapping the given primitive long array.
*/
public static LongArray wrap(long[] array) {
return new LongArray(array, array.length);
}
/**
* Creates an LongArray from the given primitive long array, copying it.
*/
public static LongArray fromArray(long[] array, int size) {
return wrap(Arrays.copyOf(array, size));
}
/**
* Changes the size of this LongArray. If this LongArray is shrinked, the backing array capacity
* is unchanged. If the new size is larger than backing array capacity, a new backing array is
* created from the current content of this LongArray padded with 0s.
*/
public void resize(int newSize) {
Preconditions.checkArgumentNonnegative(newSize);
if (newSize <= mValues.length) {
Arrays.fill(mValues, newSize, mValues.length, 0);
} else {
ensureCapacity(newSize - mSize);
}
mSize = newSize;
}
/**
* Appends the specified value to the end of this array.
*/
public void add(long value) {
add(mSize, value);
}
/**
* Inserts a value at the specified position in this array. If the specified index is equal to
* the length of the array, the value is added at the end.
*
* @throws IndexOutOfBoundsException when index < 0 || index > size()
*/
@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
public void add(int index, long value) {
ensureCapacity(1);
int rightSegment = mSize - index;
mSize++;
ArrayUtils.checkBounds(mSize, index);
if (rightSegment != 0) {
// Move by 1 all values from the right of 'index'
System.arraycopy(mValues, index, mValues, index + 1, rightSegment);
}
mValues[index] = value;
}
/**
* Adds the values in the specified array to this array.
*/
public void addAll(LongArray values) {
final int count = values.mSize;
ensureCapacity(count);
System.arraycopy(values.mValues, 0, mValues, mSize, count);
mSize += count;
}
/**
* Ensures capacity to append at least count values.
*/
private void ensureCapacity(int count) {
final int currentSize = mSize;
final int minCapacity = currentSize + count;
if (minCapacity >= mValues.length) {
final int targetCap = currentSize + (currentSize < (MIN_CAPACITY_INCREMENT / 2) ?
MIN_CAPACITY_INCREMENT : currentSize >> 1);
final int newCapacity = targetCap > minCapacity ? targetCap : minCapacity;
final long[] newValues = ArrayUtils.newUnpaddedLongArray(newCapacity);
System.arraycopy(mValues, 0, newValues, 0, currentSize);
mValues = newValues;
}
}
/**
* Removes all values from this array.
*/
public void clear() {
mSize = 0;
}
@Override
public LongArray clone() {
LongArray clone = null;
try {
clone = (LongArray) super.clone();
clone.mValues = mValues.clone();
} catch (CloneNotSupportedException cnse) {
/* ignore */
}
return clone;
}
/**
* Returns the value at the specified position in this array.
*/
@UnsupportedAppUsage
public long get(int index) {
ArrayUtils.checkBounds(mSize, index);
return mValues[index];
}
/**
* Sets the value at the specified position in this array.
*/
public void set(int index, long value) {
ArrayUtils.checkBounds(mSize, index);
mValues[index] = value;
}
/**
* Returns the index of the first occurrence of the specified value in this
* array, or -1 if this array does not contain the value.
*/
public int indexOf(long value) {
final int n = mSize;
for (int i = 0; i < n; i++) {
if (mValues[i] == value) {
return i;
}
}
return -1;
}
/**
* Removes the value at the specified index from this array.
*/
public void remove(int index) {
ArrayUtils.checkBounds(mSize, index);
System.arraycopy(mValues, index + 1, mValues, index, mSize - index - 1);
mSize--;
}
/**
* Returns the number of values in this array.
*/
@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
public int size() {
return mSize;
}
/**
* Returns a new array with the contents of this LongArray.
*/
public long[] toArray() {
return Arrays.copyOf(mValues, mSize);
}
/**
* Test if each element of {@code a} equals corresponding element from {@code b}
*/
public static boolean elementsEqual(@Nullable LongArray a, @Nullable LongArray b) {
if (a == null || b == null) return a == b;
if (a.mSize != b.mSize) return false;
for (int i = 0; i < a.mSize; i++) {
if (a.get(i) != b.get(i)) {
return false;
}
}
return true;
}
}