xmlmanager.java

XBrowser是一个完全免费并且开源的Web浏览器

/****************************************************************
*              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.util;

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

import org.w3c.dom.*;
import org.xml.sax.*;
import javax.xml.parsers.*;
import org.apache.crimson.tree.*;
//import com.sun.xml.tree.*;

import xbrowser.*;
import xbrowser.widgets.*;

public final class XMLManager
{
	public static String getNodeValue(Node node)
	{
		return( (node.getFirstChild()==null) ? "" : node.getFirstChild().getNodeValue() );
	}

	public static Document newDocument()
	{
		try
		{
			return DocumentBuilderFactory.newInstance().newDocumentBuilder().newDocument();
		}
		catch( Exception e )
		{
			//XRepository.getLogger().error(this, "An error occured while trying to create new XML document!");
			//XRepository.getLogger().error(this, e);
			return null;
		}
	}

	public static void writeDocument(String file_name, Document doc, String public_id, String system_id, String dtd_content) throws IOException
	{
	OutputStream out = new FileOutputStream(file_name);

		((XmlDocument)doc).setDoctype(public_id, system_id, dtd_content);
		((XmlDocument)doc).write(out);

		out.flush();
		out.close();
	}

	public static Document readFileDocument(String filename) throws IOException, SAXException, ParserConfigurationException
	{
		return readFileDocument(filename, null, null);
	}

	public static Document readFileDocument(String filename, String dtd_symbol, URL dtd_url) throws IOException, SAXException, ParserConfigurationException
	{
		return getDocumentBuilder(dtd_symbol, dtd_url).parse(new File(filename));
	}

	public static Document readResourceDocument(String resource) throws IOException, SAXException, ParserConfigurationException
	{
		return readResourceDocument(resource, null, null);
	}

	public static Document readResourceDocument(String resource, String dtd_symbol, URL dtd_url) throws IOException, SAXException, ParserConfigurationException
	{
		return getDocumentBuilder(dtd_symbol, dtd_url).parse(resource);
	}

	private static DocumentBuilder getDocumentBuilder(final String dtd_symbol, final URL dtd_url)
	{
	DocumentBuilderFactory doc_builder_factory = DocumentBuilderFactory.newInstance();

		doc_builder_factory.setValidating(true);

	DocumentBuilder doc_builder = null;

		try
		{
			doc_builder = doc_builder_factory.newDocumentBuilder();
		}
		catch( Exception e )
		{
			XRepository.getLogger().error(e, "An error occured while trying to create new XML document builder!");
			XRepository.getLogger().error(e, e);
			return null;
		}

		doc_builder.setEntityResolver( new EntityResolver() {
			public InputSource resolveEntity(String public_id, String system_id)
			{
				if( dtd_symbol!=null && system_id.endsWith(dtd_symbol) )
				{
					//XRepository.getLogger().message(this, "Replacing '"+system_id+"' with '"+dtd_url+"'");
					try
					{
					Reader reader = new InputStreamReader(dtd_url.openStream());

						return new InputSource(reader);
					}
					catch( Exception e )
					{
						XRepository.getLogger().error(this, "An error occured while trying to resolve the main DTD!");
						XRepository.getLogger().error(this, e);
						return null;
					}
				}
				else
					return null;
			}
		});

		return doc_builder;
	}

	public static Node findNode(Node node, String name)
	{
		if( node.getNodeName().equals(name) )
			return node;

		if( node.hasChildNodes() )
		{
		NodeList list = node.getChildNodes();
		int size = list.getLength();

			for (int i = 0; i < size; i++)
			{
			Node found = findNode(list.item(i), name);

				if( found!=null )
					return found;
			}
		}

		return null;
	}

	public static String getNodeAttribute(Node node, String name)
	{
		if( node instanceof Element )
			return ((Element)node).getAttribute(name);

		return null;
	}

	public static void addDataNodeTo(Document doc, Element parent_node, String new_node_name, String new_node_data)
	{
	Element node = (Element)doc.createElement(new_node_name);

		node.appendChild( doc.createTextNode(new_node_data) );
		parent_node.appendChild(node);
	}
}