ReorderingCursorWrapper.java

/*
 * Copyright (C) 2009 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.providers.contacts;

import android.database.AbstractCursor;
import android.database.Cursor;

/**
 * Cursor wrapper that reorders rows according to supplied specific position mapping.
 */
public class ReorderingCursorWrapper extends AbstractCursor {

    private final Cursor mCursor;
    private final int[] mPositionMap;

    /**
     * Constructor.
     *
     * @param cursor wrapped cursor
     * @param positionMap maps wrapper cursor positions to wrapped cursor positions
     *            so that positionMap[wrapperPosition] == wrappedPosition
     */
    public ReorderingCursorWrapper(Cursor cursor, int[] positionMap) {
        if (cursor.getCount() != positionMap.length) {
            throw new IllegalArgumentException("Cursor and position map have different sizes.");
        }

        mCursor = cursor;
        mPositionMap = positionMap;
    }

    @Override
    public void close() {
        super.close();
        mCursor.close();
    }

    @Override
    public boolean onMove(int oldPosition, int newPosition) {
        return mCursor.moveToPosition(mPositionMap[newPosition]);
    }

    @Override
    public String[] getColumnNames() {
        return mCursor.getColumnNames();
    }

    @Override
    public int getCount() {
        return mCursor.getCount();
    }

    @Override
    public double getDouble(int column) {
        return mCursor.getDouble(column);
    }

    @Override
    public float getFloat(int column) {
        return mCursor.getFloat(column);
    }

    @Override
    public int getInt(int column) {
        return mCursor.getInt(column);
    }

    @Override
    public long getLong(int column) {
        return mCursor.getLong(column);
    }

    @Override
    public short getShort(int column) {
        return mCursor.getShort(column);
    }

    @Override
    public String getString(int column) {
        return mCursor.getString(column);
    }

    @Override
    public int getType(int column) {
        return mCursor.getType(column);
    }

    @Override
    public boolean isNull(int column) {
        return mCursor.isNull(column);
    }
}