extensionfactory.java

一个Mp3在线搜索器

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package biz.tbuy.huliqing.jloading.ext;

import biz.tbuy.huliqing.jloading.JLoadingException;
import java.util.HashMap;
import java.util.Map;

/**
 *
 * @author huliqing
 */
public class ExtensionFactory {
    private static Map<String, Extension> ext = new HashMap<String, Extension>();
    
    /**
     * 获取指定名称(extName)的扩展面板，如果该面板不存在，则抛出异常
     * @param extName
     * @return
     * @throws biz.tbuy.huliqing.jloading.JLoadingException
     */
    public static Extension getExtension(String extName) throws 
            JLoadingException {
        Extension e = ext.get(extName);
        if (e == null) {
            // 找不到相关的扩展功能面板
            throw new JLoadingException("Could not found Extension Frame");
        }
        return e;
    }
    
    /**
     * 返回所有可用的扩展面板
     * @return ext
     */
    public static Map<String, Extension> getExtensionMap() {
        return ext;
    }
    
    /**
     * 添加一个新的扩展面板, 如果该名称（extName)的面板已经存在，则抛出异常
     * @param extName
     * @param extension 类型必须扩展自Extension
     * @throws biz.tbuy.huliqing.jloading.JLoadingException
     */
    public static void addExtension(String extName, Extension extension) throws 
            JLoadingException {
        Extension e = ext.get(extName);
        if (e != null) {
            throw new JLoadingException(
                    "The Extension Frame \"" + extName +"\" has already exist!");
        }
        ext.put(extName, extension);
    }
}