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/**
* Copyright (C) 2014 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.app.usage;
import android.util.LongSparseArray;
import android.util.Slog;
/**
* An array that indexes by a long timestamp, representing milliseconds since the epoch.
*
* {@hide}
*/
public class TimeSparseArray<E> extends LongSparseArray<E> {
private static final String TAG = TimeSparseArray.class.getSimpleName();
private boolean mWtfReported;
public TimeSparseArray() {
super();
}
/**
* Finds the index of the first element whose timestamp is greater or equal to
* the given time.
*
* @param time The timestamp for which to search the array.
* @return The index of the matched element, or -1 if no such match exists.
*/
public int closestIndexOnOrAfter(long time) {
// This is essentially a binary search, except that if no match is found
// the closest index is returned.
final int size = size();
int lo = 0;
int hi = size - 1;
int mid = -1;
long key = -1;
while (lo <= hi) {
mid = lo + ((hi - lo) / 2);
key = keyAt(mid);
if (time > key) {
lo = mid + 1;
} else if (time < key) {
hi = mid - 1;
} else {
return mid;
}
}
if (time < key) {
return mid;
} else if (time > key && lo < size) {
return lo;
} else {
return -1;
}
}
/**
* {@inheritDoc}
*
* <p> As this container is being used only to keep {@link android.util.AtomicFile files},
* there should not be any collisions. Reporting a {@link Slog#wtf(String, String)} in case that
* happens, as that will lead to one whole file being dropped.
*/
@Override
public void put(long key, E value) {
if (indexOfKey(key) >= 0) {
if (!mWtfReported) {
Slog.wtf(TAG, "Overwriting value " + get(key) + " by " + value);
mWtfReported = true;
}
}
super.put(key, value);
}
/**
* Finds the index of the first element whose timestamp is less than or equal to
* the given time.
*
* @param time The timestamp for which to search the array.
* @return The index of the matched element, or -1 if no such match exists.
*/
public int closestIndexOnOrBefore(long time) {
final int index = closestIndexOnOrAfter(time);
if (index < 0) {
// Everything is larger, so we use the last element, or -1 if the list is empty.
return size() - 1;
}
if (keyAt(index) == time) {
return index;
}
return index - 1;
}
}
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