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虚拟文件系统(Virutal File System)框架
There is a newer version: 1.6.17
package com.alogic.vfs.xscript;

import java.util.*;

import com.anysoft.util.*;
import com.anysoft.util.Properties;
import org.apache.commons.lang3.StringUtils;
import org.w3c.dom.Attr;
import org.w3c.dom.Element;

import com.alogic.blob.BlobManager;
import com.alogic.blob.aws.S3BlobManager;
import com.alogic.blob.naming.BlobManagerFactory;
import com.alogic.blob.vfs.VFSBlobManager;
import com.alogic.xscript.ExecuteWatcher;
import com.alogic.xscript.Logiclet;
import com.alogic.xscript.LogicletContext;
import com.alogic.xscript.doc.XsObject;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;

/**
 * 定位一个blob
 * @author yyduan
 *
 * @since 1.6.11.53
 */
public class Blob extends VFS{

	/**
	 * 属性列表
	 */
	protected List> attrList = new ArrayList>();
	
	protected String cid = "$blob";
	
	public Blob(String tag, Logiclet p) {
		super(tag, p);
	}
	
	@Override
	public void configure(Element element, Properties p) {
		super.configure(element, p);

		NamedNodeMap attrs = element.getAttributes();
		for (int i = 0 ;i < attrs.getLength() ; i ++){
			Node n = attrs.item(i);
			if (Node.ATTRIBUTE_NODE != n.getNodeType()){
				continue;
			}
			Attr attr = (Attr)n;

			String key = attr.getName();
			String value = attr.getValue();

			if (StringUtils.isNotEmpty(key) && StringUtils.isNotEmpty(value)){
				attrList.add(new Pair.Default(key,value));
			}
		}
	}		
	
	@Override
	public void configure(Properties p){
		super.configure(p);
		cid = getCurrentId(p);
	}
	
	@Override
	protected void onExecute(XsObject root,XsObject current, LogicletContext ctx,
			ExecuteWatcher watcher) {
		DefaultProperties props = new DefaultProperties("Default",ctx);

		for (Pair pair:attrList){
			String key = PropertiesConstants.transform(ctx,pair.key(),"");
			String value = PropertiesConstants.transform(ctx,pair.value(),"");
			if (StringUtils.isNotEmpty(value) && StringUtils.isNotEmpty(value)){
				props.SetValue(key,value);
			}
		}

		BlobManager bm = null;
		String globalId = PropertiesConstants.getString(props,"globalId","",true);
		if (StringUtils.isEmpty(globalId)){
			//如果没有定义全局的VFS,取本地配置
			TheFactory f = new TheFactory();
			String module = PropertiesConstants.getString(props,"module","vfs",true);
			try{
				bm = f.newInstance(module, props);
			}catch (Exception ex){
				log(String.format("Can not create file system with %s",module));
			}
		}else{
			bm = BlobManagerFactory.get(globalId);
		}

		if (StringUtils.isNotEmpty(cid) && bm != null){
			try{
				ctx.setObject(cid, bm);
				super.onExecute(root, current, ctx, watcher);
			}finally{
				ctx.removeObject(cid);
			}
		}
	}
	
	/**
	 * 获取当前对象id
	 * @param p 
	 * @return 当前对象id
	 */
	protected String getCurrentId(Properties p) {
		return PropertiesConstants.getString(p,"cid",cid,true);
	}

	/**
	 * 工厂类
	 * @author yyduan
	 *
	 */
	public static class TheFactory extends Factory{
		protected static Map mapping = new HashMap();
		public String getClassName(String module){
			String found = mapping.get(module);
			return StringUtils.isEmpty(found)?module:found;
		}
		
		static{
			mapping.put("s3", S3BlobManager.class.getName());
			mapping.put("vfs", VFSBlobManager.class.getName());
		}
	}


}