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/*
* 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 com.android.mail.content;
import android.database.CharArrayBuffer;
import android.database.Cursor;
import android.database.CursorWrapper;
import android.os.Bundle;
import com.android.mail.providers.UIProvider;
import com.android.mail.utils.LogTag;
import com.android.mail.utils.LogUtils;
public class ThreadSafeCursorWrapper extends CursorWrapper {
private static final String LOG_TAG = LogTag.getLogTag();
private final ThreadLocal<Integer> mPosition;
private final Object mLock = new Object();
public ThreadSafeCursorWrapper(Cursor cursor) {
super(cursor);
mPosition = new ThreadLocal<Integer>() {
@Override
protected Integer initialValue() {
return Integer.valueOf(-1);
}
};
}
@Override
public String getString(int column) {
synchronized (mLock) {
moveToCurrent();
return super.getString(column);
}
}
@Override
public short getShort(int column) {
synchronized (mLock) {
moveToCurrent();
return super.getShort(column);
}
}
@Override
public int getInt(int column) {
synchronized (mLock) {
moveToCurrent();
return super.getInt(column);
}
}
@Override
public long getLong(int column) {
synchronized (mLock) {
moveToCurrent();
return super.getLong(column);
}
}
@Override
public float getFloat(int column) {
synchronized (mLock) {
moveToCurrent();
return super.getFloat(column);
}
}
@Override
public double getDouble(int column) {
synchronized (mLock) {
moveToCurrent();
return super.getDouble(column);
}
}
@Override
public byte[] getBlob(int column) {
synchronized (mLock) {
moveToCurrent();
return super.getBlob(column);
}
}
@Override
public Bundle respond(Bundle extras) {
final int opts = extras.getInt(UIProvider.ConversationCursorCommand.COMMAND_KEY_OPTIONS);
if ((opts & UIProvider.ConversationCursorCommand.OPTION_MOVE_POSITION) != 0) {
synchronized (mLock) {
moveToCurrent();
return super.respond(extras);
}
} else {
return super.respond(extras);
}
}
@Override
public void copyStringToBuffer(int columnIndex, CharArrayBuffer buffer) {
synchronized (mLock) {
moveToCurrent();
super.copyStringToBuffer(columnIndex, buffer);
}
}
@Override
public boolean isNull(int column){
synchronized (mLock) {
moveToCurrent();
return super.isNull(column);
}
}
private void moveToCurrent() {
final int pos = mPosition.get();
final boolean result = super.moveToPosition(pos);
// AbstractCursor returns false on negative positions, although Cursor documentation
// states that -1 is a valid input. Let's just log positive values as failures.
if (!result && pos >= 0) {
LogUtils.e(LOG_TAG, "Unexpected failure to move to current position, pos=%d", pos);
}
}
@Override
public boolean move(int offset) {
final int curPos = mPosition.get();
return moveToPosition(curPos + offset);
}
@Override
public boolean moveToFirst() {
return moveToPosition(0);
}
@Override
public boolean moveToLast() {
return moveToPosition(getCount() - 1);
}
@Override
public boolean moveToNext() {
final int curPos = mPosition.get();
return moveToPosition(curPos + 1);
}
@Override
public boolean moveToPosition(int position) {
// Make sure position isn't past the end of the cursor
final int count = getCount();
if (position >= count) {
mPosition.set(count);
return false;
}
// Make sure position isn't before the beginning of the cursor
if (position < 0) {
mPosition.set(-1);
return false;
}
final int curPos = mPosition.get();
// Check for no-op moves, and skip the rest of the work for them
if (position == curPos) {
return true;
}
// Save this thread's current position.
mPosition.set(position);
return true;
}
@Override
public boolean moveToPrevious() {
final int curPos = mPosition.get();
return moveToPosition(curPos - 1);
}
@Override
public int getPosition() {
return mPosition.get();
}
}
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