hpdlfactory.java

java实现的可配置的工作流引擎,采用jsp+javabean实现

package com.hongsoft.agile.hpdl;

import java.io.File;
import java.util.HashMap;
import java.util.Map;

import org.hibernate.HibernateException;
import org.hibernate.Session;

import com.hongsoft.agile.Global;
import com.hongsoft.res.database.PrivilegeTypeCache;

/**
 * to create the object of XMLProperties,and implement the cache of it
 */
public class HpdlFactory {
	private static Map xmlPropertyCache = new HashMap();

	/**
	 * use the file,and create the xmlproperties we use the flyweight pattern
	 * 
	 * @author Administrator
	 * @param file
	 * @return XMLProperties
	 */
	public static ProcessesObject createPackageObject(Session session,String file) throws HpdlException,HibernateException{
		file=Global.getConfPath()+file;
		File newFile = new File(file);
		long lastModified = newFile.lastModified();
		//不是新文件
		if (xmlPropertyCache.containsKey(file)) {
			//文件已经被改变
			if (lastModified != ((HpdlParser) xmlPropertyCache
					.get(file)).getLastModified()) {
				xmlPropertyCache.remove(file);
				HpdlParser xmlPropertiesHpdl = new HpdlParser(file);
				xmlPropertiesHpdl.setLastModified(lastModified);
				xmlPropertyCache.put(file, xmlPropertiesHpdl);				
				ProcessesObject po= xmlPropertiesHpdl.parsePackage();
				PrivilegeTypeCache.init(session,po);
				return po;
			} else//文件没有被改变,此时对象中已经放入了PackageObject对象,直接取出就可以了
			{				
				return ((HpdlParser)xmlPropertyCache.get(file)).getPo();
			}
		} else {
			//是新文件
			HpdlParser xmlPropertiesHpdl = new HpdlParser(file);
			xmlPropertiesHpdl.setLastModified(lastModified);
			xmlPropertyCache.put(file, xmlPropertiesHpdl);			
			ProcessesObject po=xmlPropertiesHpdl.parsePackage();
			PrivilegeTypeCache.init(session,po);
			return po;
		}
	}
}