/**********************************************************
  
 File name:SoundEffects.java
 
 Author:夏文濤
 
 Version:Beta1.0
 
 Data:2007/10/16
  
 Description:
 
    游戲音效的處理
  
 Function List:
 
    1.getInstance()                 如果音效不為空,返回音效
    
    2.closeSound()                  播放器關閉
    
    3.getShopName()                 獲取商店名稱
    
    4.startLogoSound()              開始顯示游戲LOGO時的聲音
     
    5.startAutoRunSound()           開始游戲自動運行時的聲音,游戲開始的事件
    
    6.startTankfieldSound()         開始在世界地圖乘坦克行走時的聲音
    
    7.startHerofieldSound()         開始在世界地圖徒步行走時的聲音
    
    8.startTownSound()              開始在城鎮時的聲音
    
    9.startBattleSound()            開始戰斗時的聲音
    
    10.startPlayer(Player)          開始播放音效
    
    11.createPlayer(String,String)  根據音效文件路徑和類型構造播放器
 *********************************************************/

package com.Izual.MetalMax;

import javax.microedition.media.*;

import java.io.*;

class SoundEffects {

	private static SoundEffects instance;
	
	/*設置現在播放的內容和以前播放的內容*/
	Player currentPlayer = null;
	Player lastPlayer = null;

	/*構造函數,把現在播放的內容設者成以前播放的內容*/
	public SoundEffects() {
		// TODO 自動生成構造函數存根

		lastPlayer = currentPlayer;
		}
		
	/*如果音效不為空,返回音效*/
	static SoundEffects getInstance(){
		
		if(instance == null){
			
			instance = new SoundEffects();
		}
		
		return instance;
	}
	
	/*播放器關閉*/
	void closeSound(){
					
		currentPlayer.close();

	}

	/*開始顯示游戲LOGO時的聲音*/
	void startLogoSound(){
		
		lastPlayer = currentPlayer;
		startPlayer(createPlayer("/open.mid","audio/midi"));

	}
	
	/*開始游戲自動運行時的聲音,游戲開始的事件*/
	void startAutoRunSound(){
		
		lastPlayer = currentPlayer;
		startPlayer(createPlayer("/autorun.mid","audio/midi"));
	}
	
	/*開始在世界地圖乘坦克行走時的聲音*/
	void startTankfieldSound(){
		
		lastPlayer = currentPlayer;
		startPlayer(createPlayer("/tank.mid","audio/midi"));
	}
	
	/*開始在世界地圖徒步行走時的聲音*/
	void startHerofieldSound(){
		
		lastPlayer = currentPlayer;
		startPlayer(createPlayer("/field.mid","audio/midi"));
	}

	/*開始在城鎮時的聲音*/
	void startTownSound(){
		
		lastPlayer = currentPlayer;
		startPlayer(createPlayer("/town.mid","audio/midi"));
	}
	
	/*開始戰斗時的聲音*/
	void startBattleSound(){
		
		lastPlayer = currentPlayer;
		startPlayer(createPlayer("/battle.mid","audio/midi"));
	}
	
	/*開始播放音效*/
	private void startPlayer(Player p){
		
		if(p != null){
						
				try {
					
					p.stop();
					p.setLoopCount(-1);
					p.start();
				} catch (MediaException e) {
					// TODO 自動生成 catch 塊
					e.printStackTrace();
				}
				
		}
		
		/*如果現在播放的音效和以前播放的音效不一致,則關閉以前的音效,防止重音*/
		if(p != lastPlayer & lastPlayer != null){

			lastPlayer.close();
		}
	}
	
	/*根據音效文件路徑和類型構造播放器*/
	private Player createPlayer(String filename,String format){
		
		Player p = null;
		
		try{
			
			InputStream is = getClass().getResourceAsStream(filename);
			p = Manager.createPlayer(is,format);
			p.realize();
			p.prefetch();
			
		}catch(IOException e){}
		 catch(MediaException e){}
		 
		 /*把它設置為正在播放的音效*/
	     currentPlayer = p;
		 
		 return p;
	}
	
}