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/*
* Copyright (C) 2012 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 com.android.gallery3d.data;
import java.util.ArrayList;
// FilterDeleteSet filters a base MediaSet to remove a deletion item. The user
// can use the following method to change the deletion item:
//
// void setDeletion(Path path, int index);
//
// If the path is null, there is no deletion item.
public class FilterDeleteSet extends MediaSet implements ContentListener {
private static final String TAG = "FilterDeleteSet";
private final MediaSet mBaseSet;
private Path mDeletionPath;
private int mDeletionIndexHint;
private boolean mNewDeletionSettingPending = false;
// This is set to true or false in reload(), so we know if the given
// mDelectionPath is still in the mBaseSet, and if so we can adjust the
// index and items.
private boolean mDeletionInEffect;
private int mDeletionIndex;
public FilterDeleteSet(Path path, MediaSet baseSet) {
super(path, INVALID_DATA_VERSION);
mBaseSet = baseSet;
mBaseSet.addContentListener(this);
}
@Override
public String getName() {
return mBaseSet.getName();
}
@Override
public int getMediaItemCount() {
if (mDeletionInEffect) {
return mBaseSet.getMediaItemCount() - 1;
} else {
return mBaseSet.getMediaItemCount();
}
}
@Override
public ArrayList<MediaItem> getMediaItem(int start, int count) {
if (!mDeletionInEffect || mDeletionIndex >= start + count) {
return mBaseSet.getMediaItem(start, count);
}
if (mDeletionIndex < start) {
return mBaseSet.getMediaItem(start + 1, count);
}
ArrayList<MediaItem> base = mBaseSet.getMediaItem(start, count + 1);
base.remove(mDeletionIndex - start);
return base;
}
@Override
public long reload() {
boolean newData = mBaseSet.reload() > mDataVersion;
if (!newData && !mNewDeletionSettingPending) return mDataVersion;
mNewDeletionSettingPending = false;
mDeletionInEffect = false;
if (mDeletionPath != null) {
// See if mDeletionPath can be found in the MediaSet. We don't want
// to search the whole mBaseSet, so we just search a small window
// that is close the the index hint.
int n = mBaseSet.getMediaItemCount();
int from = Math.max(mDeletionIndexHint - 5, 0);
int to = Math.min(mDeletionIndexHint + 5, n);
ArrayList<MediaItem> items = mBaseSet.getMediaItem(from, to - from);
for (int i = 0; i < items.size(); i++) {
MediaItem item = items.get(i);
if (item != null && item.getPath() == mDeletionPath) {
mDeletionInEffect = true;
mDeletionIndex = i + from;
}
}
// We cannot find this path. Set it to null to avoid further search.
if (!mDeletionInEffect) {
mDeletionPath = null;
}
}
mDataVersion = nextVersionNumber();
return mDataVersion;
}
@Override
public void onContentDirty() {
notifyContentChanged();
}
public void setDeletion(Path path, int indexHint) {
mDeletionPath = path;
mDeletionIndexHint = indexHint;
mNewDeletionSettingPending = true;
notifyContentChanged();
}
}
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