DownFileDao.java

/*
 * Copyright (C) 2012 www.amsoft.cn
 * 
 * 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.andbase.util.download;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;

import com.ab.db.AbBasicDBDao;

// TODO: Auto-generated Javadoc
/**
 * The Class DownFileDao.
 */
public class DownFileDao extends AbBasicDBDao{
	
	/** The open helper. */
	private MyDBHelper openHelper;
	
	/** The m context. */
	public static Context mContext = null;
	// 单例
	/** The m down file dao. */
	public static DownFileDao mDownFileDao = null;

	/**
	 * Instantiates a new down file dao.
	 *
	 * @param context the context
	 */
	public DownFileDao(Context context) {
		openHelper = new MyDBHelper(context);
	}
	
	/**
	 * Gets the single instance of DownFileDao.
	 *
	 * @param context the context
	 * @return single instance of DownFileDao
	 */
	public static DownFileDao getInstance(Context context) {
		    mContext = context;
			if (mDownFileDao == null) {
				mDownFileDao = new DownFileDao(context);
			}
			return mDownFileDao;
	}
	
	/**
	 * 获取已经下载的文件的信息.
	 *
	 * @param path the path
	 * @return the down file
	 */
	public DownFile getDownFile(String path){
		SQLiteDatabase db = null;
		Cursor cursor = null;
		DownFile mDownFile = null;
		try {
			 db = openHelper.getReadableDatabase();
			 String where = "DOWNURL = ?";
			 String[] whereValue = {path};
			 cursor = db.query("FILEDOWN",null,where,whereValue,null,null,null);
			 if(cursor.moveToFirst()){
				mDownFile = new DownFile();
				mDownFile.set_ID(getIntColumnValue("_ID",cursor));
				mDownFile.setName(getStringColumnValue("NAME",cursor));
				mDownFile.setDescription(getStringColumnValue("DESCRIPTION",cursor));
				mDownFile.setPakageName(getStringColumnValue("PAKAGENAME",cursor));
				mDownFile.setDownUrl(getStringColumnValue("DOWNURL",cursor));
				mDownFile.setDownPath(getStringColumnValue("DOWNPATH",cursor));
				mDownFile.setState(getIntColumnValue("STATE",cursor));
				mDownFile.setDownLength(getIntColumnValue("DOWNLENGTH",cursor));
				mDownFile.setTotalLength(getIntColumnValue("TOTALLENGTH",cursor));
				mDownFile.setSuffix(getStringColumnValue("DOWNSUFFIX",cursor));
				
			 }
		} catch (Exception e) {
			e.printStackTrace();
			return null;
		}finally{
			closeDatabase(cursor,db);
		}
		return mDownFile;
	}
	
	/**
	 * 保存线程已经下载的文件信息.
	 *
	 * @param mDownFile the m down file
	 * @return the long
	 */
	public synchronized long  save(DownFile mDownFile){
		SQLiteDatabase db = null;
		long row = 0;
		try{
			db = openHelper.getWritableDatabase();
			ContentValues cv = new ContentValues();
			cv.put("NAME", mDownFile.getName());
			cv.put("DESCRIPTION", mDownFile.getDescription());
			cv.put("PAKAGENAME", mDownFile.getPakageName());
			cv.put("DOWNURL", mDownFile.getDownUrl());
			cv.put("DOWNPATH", mDownFile.getDownPath());
			cv.put("STATE",mDownFile.getState());
			cv.put("DOWNLENGTH", mDownFile.getDownLength());
			cv.put("TOTALLENGTH", mDownFile.getTotalLength());
			cv.put("DOWNSUFFIX", mDownFile.getSuffix());
			row = db.insert("FILEDOWN", null, cv);
		} catch (Exception e) {
			e.printStackTrace();
		}finally{
			closeDatabase(null,db);
		}
		return row;
	}
	
	/**
	 * 实时更新线程已经下载的文件长度.
	 *
	 * @param mDownFile the m down file
	 * @return the long
	 */
	public synchronized long update(DownFile mDownFile){
		long row = -1;
		SQLiteDatabase db = null;
		try {
			db = openHelper.getWritableDatabase();
			String where = "DOWNURL = ? ";
			String[] whereValue = {mDownFile.getDownUrl()};
			ContentValues cv = new ContentValues();
			cv.put("STATE",mDownFile.getState());
			cv.put("DOWNLENGTH", mDownFile.getDownLength());
			cv.put("TOTALLENGTH", mDownFile.getTotalLength());
			row = db.update("FILEDOWN",cv, where, whereValue);
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			closeDatabase(null, db);
		}
		return row;
	}
		
	/**
	 * 删除对应的下载记录.
	 *
	 * @param path the path
	 * @return the long
	 */
	public synchronized long delete(String path){
		long row = -1;
		SQLiteDatabase db = null;
		try {
			db = openHelper.getWritableDatabase();
			String where = "DOWNURL = ? ";
			String[] whereValue = {path};
			row = db.delete("FILEDOWN", where, whereValue);
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			closeDatabase(null, db);
		}
		return row;
	}
	
}