1/*
2 * Copyright (C) 2013 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package android.util;
18
19import com.android.inputmethod.latin.utils.CollectionUtils;
20
21import java.util.ArrayList;
22import java.util.Collections;
23
24public class SparseArray<E> {
25    private final ArrayList<Integer> mKeys;
26    private final ArrayList<E> mValues;
27
28    public SparseArray() {
29        this(10);
30    }
31
32    public SparseArray(final int initialCapacity) {
33        mKeys = CollectionUtils.newArrayList(initialCapacity);
34        mValues = CollectionUtils.newArrayList(initialCapacity);
35    }
36
37    public int size() {
38        return mKeys.size();
39    }
40
41    public void clear() {
42        mKeys.clear();
43        mValues.clear();
44    }
45
46    public void put(final int key, final E value) {
47        final int index = Collections.binarySearch(mKeys, key);
48        if (index >= 0) {
49            mValues.set(index, value);
50            return;
51        }
52        final int insertIndex = ~index;
53        mKeys.add(insertIndex, key);
54        mValues.add(insertIndex, value);
55    }
56
57    public E get(final int key) {
58        return get(key, null);
59    }
60
61    public E get(final int key, final E valueIfKeyNotFound) {
62        final int index = Collections.binarySearch(mKeys, key);
63        if (index >= 0) {
64            return mValues.get(index);
65        }
66        return valueIfKeyNotFound;
67    }
68
69    public int indexOfKey(final int key) {
70        return mKeys.indexOf(key);
71    }
72
73    public int indexOfValue(final E value) {
74        return mValues.indexOf(value);
75    }
76
77    public int keyAt(final int index) {
78        return mKeys.get(index);
79    }
80
81    public E valueAt(final int index) {
82        return mValues.get(index);
83    }
84}
85