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      1 /*
      2  * Copyright (C) 2009 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 package com.android.providers.contacts;
     17 
     18 import android.database.AbstractCursor;
     19 import android.database.Cursor;
     20 
     21 /**
     22  * Cursor wrapper that reorders rows according to supplied specific position mapping.
     23  */
     24 public class ReorderingCursorWrapper extends AbstractCursor {
     25 
     26     private final Cursor mCursor;
     27     private final int[] mPositionMap;
     28 
     29     /**
     30      * Constructor.
     31      *
     32      * @param cursor wrapped cursor
     33      * @param positionMap maps wrapper cursor positions to wrapped cursor positions
     34      *            so that positionMap[wrapperPosition] == wrappedPosition
     35      */
     36     public ReorderingCursorWrapper(Cursor cursor, int[] positionMap) {
     37         if (cursor.getCount() != positionMap.length) {
     38             throw new IllegalArgumentException("Cursor and position map have different sizes.");
     39         }
     40 
     41         mCursor = cursor;
     42         mPositionMap = positionMap;
     43     }
     44 
     45     @Override
     46     public void close() {
     47         super.close();
     48         mCursor.close();
     49     }
     50 
     51     @Override
     52     public boolean onMove(int oldPosition, int newPosition) {
     53         return mCursor.moveToPosition(mPositionMap[newPosition]);
     54     }
     55 
     56     @Override
     57     public String[] getColumnNames() {
     58         return mCursor.getColumnNames();
     59     }
     60 
     61     @Override
     62     public int getCount() {
     63         return mCursor.getCount();
     64     }
     65 
     66     @Override
     67     public double getDouble(int column) {
     68         return mCursor.getDouble(column);
     69     }
     70 
     71     @Override
     72     public float getFloat(int column) {
     73         return mCursor.getFloat(column);
     74     }
     75 
     76     @Override
     77     public int getInt(int column) {
     78         return mCursor.getInt(column);
     79     }
     80 
     81     @Override
     82     public long getLong(int column) {
     83         return mCursor.getLong(column);
     84     }
     85 
     86     @Override
     87     public short getShort(int column) {
     88         return mCursor.getShort(column);
     89     }
     90 
     91     @Override
     92     public String getString(int column) {
     93         return mCursor.getString(column);
     94     }
     95 
     96     @Override
     97     public int getType(int column) {
     98         return mCursor.getType(column);
     99     }
    100 
    101     @Override
    102     public boolean isNull(int column) {
    103         return mCursor.isNull(column);
    104     }
    105 }