bookmarkedcatalogs.java

基于jxta的文件共享和聊天系统源代码,下载下来分析吧

/*
 * Created on 21-nov-2005
 *
 */
/**
 * @author magowiz
 *
 */

package p2p_system;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.apache.xerces.dom.DocumentImpl;
import org.apache.xml.serialize.OutputFormat;
import org.apache.xml.serialize.XMLSerializer;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;


public class BookmarkedCatalogs {
	
	private File FCD=new File("fcdata.xml");
	private Document doc;
	private BookmarkedCatalogItem list;
	
	private int catN;
		
	public BookmarkedCatalogs()
	{
	  
	  DocumentBuilder db = null;
	  DocumentBuilderFactory dbf =DocumentBuilderFactory.newInstance();
		 try {
	        db = dbf.newDocumentBuilder();
	    } catch (ParserConfigurationException pce) {pce.printStackTrace();}
	 if(!FCD.exists())  
	 {
	 	System.out.println("not exist");
	 	catN=0;
	 	doc= new DocumentImpl();
	 	Element root = doc.createElement("fcdata");
	 	doc.appendChild(root);
 		FileOutputStream fos=null;
 		try{ fos = new FileOutputStream(FCD);}
 		catch(FileNotFoundException fnf){}	 		
 		OutputFormat of = new OutputFormat("XML","ISO-8859-15",true);
 		of.setIndent(1);
 		XMLSerializer serializer = new XMLSerializer(fos,of);
 		try{serializer.asDOMSerializer();
 		serializer.serialize( doc.getDocumentElement() );
 		fos.close();}
 		catch(IOException ioe){}
	 }
	  	else{
	  		
		 	try {doc = db.parse(FCD);} 
		    catch (SAXException se){se.printStackTrace();} 
		    catch (IOException ioe) {
		        		ioe.printStackTrace();
		        		System.exit(1);
		    		}
		    NodeList l = doc.getElementsByTagName("catalog");
		    catN=l.getLength();
		    for(int i=0;i<l.getLength();i++)
		     {
		       
		       String cl=null;
		       String cn=null;
		       URL cu=null;
		       Element e=(Element) l.item(i);
		       NodeList childs=e.getChildNodes();
		    	
		     	for(int j=0; j<childs.getLength();j++)
		     	{
		     	
		     	 if(childs.item(j).getNodeType()==Node.ELEMENT_NODE)
		     	 {
		     	 
		     	  if(childs.item(j).getNodeName().equals("label"))
		     	  {
		     	  	cl=new String((childs.item(j).getFirstChild().getNodeValue().trim()));
		     	  	
		     	  }
		     	 if(childs.item(j).getNodeName().equals("name")) 
		     	 {
		     	 	
		     	 	cn=new String(childs.item(j).getFirstChild().getNodeValue());		     	 	
		     	 	
		     	 }
		    	 if(childs.item(j).getNodeName().equals("url")) 
		     	 {
		     	 	
		     	 	try {cu=new URL(childs.item(j).getFirstChild().getNodeValue());}
		     	 	catch(MalformedURLException mue){mue.printStackTrace();}
		     	 	
		     	 }
		     }
		     	 
		     	 
		     	 
	  	}
		     	
		     	//System.out.println(cl);
		     	 BookmarkedCatalogItem bci=new BookmarkedCatalogItem();	
		     	 bci.insert(cl,cn,cu);
		     	
		     	 BookmarkedCatalogItem temp=list;
		     	 if(temp==null)
		     	 	list=bci;
		     	 else
		     	 {
		     	 	while(temp.getNext()!=null)
		     	 		temp=temp.getNext();
		     	 	temp.setNext(bci);
		     	 }
		     	
    }
		     
		     
}
	
}

	public BookmarkedCatalogItem getItem(int index)
	{
		BookmarkedCatalogItem r=null;
		if (index<=catN)
		{
			r=list;
			for(int i=0;i<index;i++)
			{
				r=r.getNext();
			}
		}
		return r;
	}
	
	public void insert(BookmarkedCatalogItem bci)
	{
		if(!search(bci.getCatalogName()))
			{
				addListItem(bci);
				addElementItem(bci);
				save();
			}
	}
	
	private boolean search(String cname)
	{
		boolean r=false;
		BookmarkedCatalogItem bc=list;
		while((bc!=null)&&(!bc.getCatalogName().equals(cname)))
		{
			bc=bc.getNext();
		}
		if(bc!=null)
		{
			r=true;
		}		
		return r;
	}
	
	public boolean delete (String cn)
	{
	 boolean r;
	 r=deleteListItem(cn);
	 deleteElementItem(cn);
	 if(r)save();
	 return r;
	}
	
	private BookmarkedCatalogItem searchInList (String cn)
	{
	 boolean found=false;
	 BookmarkedCatalogItem temp=list;
	 if(temp.getCatalogName().equals(cn))
	 {
	 	found=true;
	 }
	 else{
	 		while ((!found)&&(temp.getNext()!=null))
	 		{
	 			if(temp.getNext().getCatalogName().equals(cn))
	 				{
	 					found=true;
	 					
	 				}
	 			else
	 				temp=temp.getNext();
	 		}
	 	}
	 if (!found) temp=null;
	 return temp;	
	}
	
	private Node searchInDom(String cn)
	{
	 Node n=null;
	 NodeList nl=doc.getElementsByTagName("name");
	 int i=0;
	 boolean found=false;
	 while((i<nl.getLength())&&(!found))
	 {
	  Node temp=nl.item(i);
	  if(temp.getFirstChild().getNodeValue().equals(cn))
	  {
	  	found=true;
	  	n=nl.item(i).getParentNode();
	  }
	  i++;
	 }
	 return n;	
	}
	
	private boolean deleteListItem(String cn)
	{
		boolean deleted=false;
		BookmarkedCatalogItem p=searchInList(cn);
		if((p!=null)&&(p.getNext()==null))
		{
			list=null;
			deleted=true;
		}
		else if(p!=null){
				BookmarkedCatalogItem x=p.getNext();				
				BookmarkedCatalogItem s=x.getNext();
				if(x!=null)
					{
					deleted=true;
					p.setNext(s);
					}		
			}
		return deleted;
	}
	
	private boolean deleteElementItem(String cn)
	{
		boolean deleted=false;
		Node s=searchInDom(cn);
		if (s!=null)
		{
		 deleted=true;
		 NodeList nl=doc.getElementsByTagName("fcdata");
		 Node r=nl.item(0);
		 r.removeChild(s);
		}
		return deleted;
	}
	
	private void addListItem (BookmarkedCatalogItem bci)
	{
		BookmarkedCatalogItem temp=list;
		if(list==null)
			list=bci;
		else{
			while(temp.getNext()!=null)
				temp=temp.getNext();
			temp.setNext(bci);
			}
	}
	
	
	private int addElementItem(BookmarkedCatalogItem bci)
	{
	 Node c=doc.createElement("catalog");
	 NodeList nl=doc.getElementsByTagName("fcdata");
	 Node r=nl.item(0);
	 Node e=doc.createElement("label");
	 Node t=doc.createTextNode(bci.getCatalogLabel());
	 e.appendChild(t);
	 c.appendChild(e);
	 e=doc.createElement("name");
	 t=doc.createTextNode(bci.getCatalogName());
	 e.appendChild(t);
	 c.appendChild(e);
	 e=doc.createElement("url");
	 t=doc.createTextNode(bci.getCatalogUrl().toString());
	 e.appendChild(t);
	 c.appendChild(e);	 
	 r.appendChild(c);
	 return 0;	
	}
	
	private  boolean save()
	{
	 boolean s=true;
	 try{
	 	  //System.out.println("saving");
	 	  Transformer transformer= TransformerFactory.newInstance().newTransformer();
	 	  //String systemID=doc.getDoctype().getSystemId();
	 	  //transformer.setOutputProperty(OutputKeys.DOCTYPE_SYSTEM,"prodotti.dtd");
	 	  transformer.setOutputProperty(OutputKeys.METHOD,"xml");
	 	  transformer.setOutputProperty(OutputKeys.INDENT,"yes");
	 	  DOMSource source=new DOMSource(doc);
	 	  FileOutputStream fos=new FileOutputStream(FCD);
	 	  StreamResult result = new StreamResult (fos);
	 	  transformer.transform(source,result);
	  	}
	 catch(TransformerConfigurationException tce){System.out.println("tce");return false;}
		catch(TransformerException te){System.out.println("te");return false;}
		catch(IOException ioe){System.out.println("ioe");return false;}
	 return s;		
	}
	
	public int getCatalogsNumber()
	{
		return this.catN;
	}
	
	
}