/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.launcher3.util;
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import java.util.Arrays;
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/**
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* Copy of the platform hidden implementation of android.util.IntArray.
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* Implements a growing array of int primitives.
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*/
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public class IntArray implements Cloneable {
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private static final int MIN_CAPACITY_INCREMENT = 12;
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private static final int[] EMPTY_INT = new int[0];
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/* package private */ int[] mValues;
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/* package private */ int mSize;
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private IntArray(int[] array, int size) {
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mValues = array;
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mSize = size;
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}
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/**
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* Creates an empty IntArray with the default initial capacity.
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*/
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public IntArray() {
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this(10);
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}
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/**
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* Creates an empty IntArray with the specified initial capacity.
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*/
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public IntArray(int initialCapacity) {
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if (initialCapacity == 0) {
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mValues = EMPTY_INT;
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} else {
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mValues = new int[initialCapacity];
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}
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mSize = 0;
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}
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/**
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* Creates an IntArray wrapping the given primitive int array.
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*/
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public static IntArray wrap(int... array) {
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return new IntArray(array, array.length);
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}
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/**
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* Appends the specified value to the end of this array.
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*/
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public void add(int value) {
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add(mSize, value);
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}
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/**
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* Inserts a value at the specified position in this array. If the specified index is equal to
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* the length of the array, the value is added at the end.
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*
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* @throws IndexOutOfBoundsException when index < 0 || index > size()
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*/
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public void add(int index, int value) {
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ensureCapacity(1);
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int rightSegment = mSize - index;
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mSize++;
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checkBounds(mSize, index);
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if (rightSegment != 0) {
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// Move by 1 all values from the right of 'index'
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System.arraycopy(mValues, index, mValues, index + 1, rightSegment);
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}
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mValues[index] = value;
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}
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/**
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* Adds the values in the specified array to this array.
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*/
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public void addAll(IntArray values) {
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final int count = values.mSize;
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ensureCapacity(count);
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System.arraycopy(values.mValues, 0, mValues, mSize, count);
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mSize += count;
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}
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/**
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* Sets the array to be same as {@param other}
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*/
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public void copyFrom(IntArray other) {
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clear();
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addAll(other);
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}
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/**
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* Ensures capacity to append at least <code>count</code> values.
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*/
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private void ensureCapacity(int count) {
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final int currentSize = mSize;
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final int minCapacity = currentSize + count;
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if (minCapacity >= mValues.length) {
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final int targetCap = currentSize + (currentSize < (MIN_CAPACITY_INCREMENT / 2) ?
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MIN_CAPACITY_INCREMENT : currentSize >> 1);
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final int newCapacity = targetCap > minCapacity ? targetCap : minCapacity;
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final int[] newValues = new int[newCapacity];
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System.arraycopy(mValues, 0, newValues, 0, currentSize);
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mValues = newValues;
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}
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}
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/**
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* Removes all values from this array.
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*/
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public void clear() {
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mSize = 0;
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}
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@Override
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public IntArray clone() {
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return wrap(toArray());
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}
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@Override
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public boolean equals(Object obj) {
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if (obj == this) {
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return true;
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}
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if (obj instanceof IntArray) {
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IntArray arr = (IntArray) obj;
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if (mSize == arr.mSize) {
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for (int i = 0; i < mSize; i++) {
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if (arr.mValues[i] != mValues[i]) {
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return false;
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}
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}
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return true;
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}
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}
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return false;
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}
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/**
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* Returns the value at the specified position in this array.
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*/
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public int get(int index) {
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checkBounds(mSize, index);
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return mValues[index];
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}
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/**
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* Sets the value at the specified position in this array.
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*/
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public void set(int index, int value) {
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checkBounds(mSize, index);
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mValues[index] = value;
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}
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/**
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* Returns the index of the first occurrence of the specified value in this
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* array, or -1 if this array does not contain the value.
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*/
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public int indexOf(int value) {
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final int n = mSize;
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for (int i = 0; i < n; i++) {
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if (mValues[i] == value) {
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return i;
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}
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}
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return -1;
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}
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public boolean contains(int value) {
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return indexOf(value) >= 0;
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}
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public boolean isEmpty() {
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return mSize == 0;
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}
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/**
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* Removes the value at the specified index from this array.
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*/
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public void removeIndex(int index) {
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checkBounds(mSize, index);
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System.arraycopy(mValues, index + 1, mValues, index, mSize - index - 1);
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mSize--;
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}
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/**
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* Removes the values if it exists
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*/
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public void removeValue(int value) {
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int index = indexOf(value);
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if (index >= 0) {
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removeIndex(index);
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}
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}
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/**
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* Removes the values if it exists
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*/
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public void removeAllValues(IntArray values) {
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for (int i = 0; i < values.mSize; i++) {
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removeValue(values.mValues[i]);
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}
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}
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/**
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* Returns the number of values in this array.
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*/
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public int size() {
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return mSize;
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}
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/**
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* Returns a new array with the contents of this IntArray.
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*/
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public int[] toArray() {
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return mSize == 0 ? EMPTY_INT : Arrays.copyOf(mValues, mSize);
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}
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/**
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* Returns a comma separate list of all values.
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*/
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public String toConcatString() {
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StringBuilder b = new StringBuilder();
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for (int i = 0; i < mSize ; i++) {
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if (i > 0) {
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b.append(", ");
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}
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b.append(mValues[i]);
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}
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return b.toString();
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}
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/**
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* Throws {@link ArrayIndexOutOfBoundsException} if the index is out of bounds.
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*
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* @param len length of the array. Must be non-negative
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* @param index the index to check
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* @throws ArrayIndexOutOfBoundsException if the {@code index} is out of bounds of the array
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*/
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private static void checkBounds(int len, int index) {
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if (index < 0 || len <= index) {
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throw new ArrayIndexOutOfBoundsException("length=" + len + "; index=" + index);
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}
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}
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}
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