arraylistcursor.java

Android平台上的media player, iPhone风格

/*
 * Copyright (C) 2006 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.internal.database;

import android.database.AbstractCursor;

import java.lang.System;
import java.util.ArrayList;

/**
 * A convenience class that presents a two-dimensional ArrayList
 * as a Cursor.
 */
public class ArrayListCursor extends AbstractCursor
{
    public ArrayListCursor(String[] columnNames, ArrayList<ArrayList> rows)
    {        
        int colCount = columnNames.length;
        boolean foundID = false;
        // Add an _id column if not in columnNames
        for (int i=0; i<colCount; ++i) {            
            if (columnNames[i].compareToIgnoreCase("_id") == 0) {
                mColumnNames = columnNames;
                foundID = true;
                break;
            }
        }
        
        if (!foundID) {
            mColumnNames = new String[colCount + 1];
            System.arraycopy(columnNames, 0, mColumnNames, 0, columnNames.length);
            mColumnNames[colCount] = "_id";
        }
        
        int rowCount = rows.size();
        mRows = new ArrayList[rowCount];
        
        for (int i = 0; i<rowCount; ++i) {
            mRows[i] = rows.get(i);
            if (!foundID) {
                mRows[i].add(Long.valueOf(i));
            }
        }

     }

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

//    @Override
//    public boolean deleteRow()
//    {
//        return false;
//    }

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

    @Override
    public String getString(int columnIndex)
    {
        Object cell = mRows[mPos].get(columnIndex);
        return (cell == null) ? null : cell.toString();
    }
    
    @Override
    public short getShort(int columnIndex)
    {
        Number num = (Number)mRows[mPos].get(columnIndex);
        return num.shortValue();
    }

    @Override
    public int getInt(int columnIndex)
    {
        Number num = (Number)mRows[mPos].get(columnIndex);
        return num.intValue();
    }

    @Override
    public long getLong(int columnIndex)
    {
        Number num = (Number)mRows[mPos].get(columnIndex);
        return num.longValue();
    }

    @Override
    public float getFloat(int columnIndex)
    {
        Number num = (Number)mRows[mPos].get(columnIndex);
        return num.floatValue();
    }

    @Override
    public double getDouble(int columnIndex)
    {
        Number num = (Number)mRows[mPos].get(columnIndex);
        return num.doubleValue();
    }

    @Override
    public boolean isNull(int columnIndex)
    {
        return mRows[mPos].get(columnIndex) == null;
    }

    private String[] mColumnNames;
    private ArrayList<Object>[] mRows;
}