xcacheindexdefaultserializer.java

来自「java写的浏览器」· Java 代码 · 共 106 行

/****************************************************************
*              XBrowser  -  eXtended web Browser                *
*                                                               *
*           Copyright (c) 2000-2001  Armond Avanes              *
*     Refer to ReadMe & License files for more information      *
*                                                               *
*                                                               *
*                      By: Armond Avanes                        *
*       [e-mail]     &    [e-mail]        *
*                http://xbrowser.sourceforge.net/               *
*****************************************************************/
package xbrowser.cache.io;

import java.io.*;
import java.net.*;
import java.util.*;
import java.text.*;

import xbrowser.*;
import xbrowser.util.*;
import xbrowser.cache.*;

import org.w3c.dom.*;

public class XCacheIndexDefaultSerializer implements XCacheIndexSerializer
{
	public XCacheIndexDefaultSerializer()
	{
	}

	public void importCacheIndexes(String file_name, XCacheManager cache_manager) throws Exception
	{
	URL dtd_url = XRepository.getResourceManager().getResourceURL(DTD_URL);
	Document doc = XMLManager.readFileDocument(file_name, DTD_SYMBOL, dtd_url);
	Node node = XMLManager.findNode(doc,"xcache").getNextSibling().getFirstChild();

		while( node!=null )
		{
			if( node instanceof Element )
			{
				if( node.getNodeName().equals("item") )
					loadCacheItem(node, cache_manager);
			}

			node = node.getNextSibling();
		}
	}

	private void loadCacheItem(Node node, XCacheManager cache_manager) throws DOMException
	{
	XCacheItem cache_item = new XCacheItem();

		node = node.getFirstChild();
		while( node!=null )
		{
			if( node instanceof Element )
			{
				if( node.getNodeName().equals("url") )
					cache_item.setURL( XMLManager.getNodeValue(node) );
				else if( node.getNodeName().equals("file") )
					cache_item.setFileName( XMLManager.getNodeValue(node) );
				else if( node.getNodeName().equals("content-type") )
					cache_item.setContentType( XMLManager.getNodeValue(node) );
			}

			node = node.getNextSibling();
		}

		cache_manager.addCacheItem(cache_item);
	}

	public void exportCacheIndexes(String file_name, XCacheManager cache_manager) throws Exception
	{
	Document doc = XMLManager.newDocument();
	Element root = (Element)doc.createElement("xcache");

		doc.appendChild(root);

		//// Saving CacheItems
	Iterator it = cache_manager.getCacheItems();

		while( it.hasNext() )
			saveCacheItem( (XCacheItem)it.next(), doc, root);
		//// CacheItems Saved

		root.normalize();

		XMLManager.writeDocument(file_name, doc, null, DTD_SYMBOL, null);
	}

	private void saveCacheItem(XCacheItem cache_item, Document doc, Element parent_node)
	{
	Element node = (Element)doc.createElement("item");

		XMLManager.addDataNodeTo(doc, node, "url", cache_item.getURL());
		XMLManager.addDataNodeTo(doc, node, "file", cache_item.getFileName());
		XMLManager.addDataNodeTo(doc, node, "content-type", cache_item.getContentType());

		parent_node.appendChild(node);
	}

// Attributes:
    private final String DTD_SYMBOL = "xbrowser:default:cache";
    private final String DTD_URL = XProjectConstants.DTD_DIR+"XCache.dtd";
}