cmsxmlprojectxparser.java

java 编写的程序

/*
* File   : $Source: /usr/local/cvs/opencms/src/com/opencms/template/CmsXmlProjectXParser.java,v $
* Date   : $Date: 2001/07/31 15:50:16 $
* Version: $Revision: 1.7 $
*
* This library is part of OpenCms -
* the Open Source Content Mananagement System
*
* Copyright (C) 2001  The OpenCms Group
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
* Lesser General Public License for more details.
*
* For further information about OpenCms, please see the
* OpenCms Website: http://www.opencms.org 
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/


package com.opencms.template;

import java.io.*;
import org.w3c.dom.*;
import org.xml.sax.*;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import org.apache.xml.serialize.*;
import com.opencms.core.*;

/**
 * Implementation of the OpenCms XML parser interface for
 * the ProjectX parser.
 * 
 * @author Alexander Kandzior
 * @author Alexander Lucas
 * @version $Revision: 1.7 $ $Date: 2001/07/31 15:50:16 $
 */
public class CmsXmlProjectXParser implements I_CmsXmlParser,I_CmsLogChannels {
    
    /** Prevents the parser from printing multiple error messages.*/
    private static boolean c_xercesWarning = false;
    
    /**
     * Creates an empty DOM XML document.
     * Workarround caus original method is corruped
     * 
     * @author Michaela Schleich
     * @param docNod first Node in empty  XML document
     * @return Empty document.
     */
    public Document createEmptyDocument(String docNod) throws Exception {
        String docXml = new String("<?xml version=\"1.0\" encoding=\"" + C_XML_ENCODING + "\"?>");
        docXml = docXml + "<" + docNod + ">" + "</" + docNod + ">";
        StringReader reader = new StringReader(docXml);
        return parse(reader);
    
    //return (Document)(new DocumentImpl(null));
    }
    
    /**
     * Calls a XML printer for converting a XML DOM document
     * to a String.
     * @param doc Document to be printed.
     * @param out OutputStream to print to.
     */
    public void getXmlText(Document doc, OutputStream out) {
        OutputStreamWriter osw = new OutputStreamWriter(out);
        getXmlText(doc, osw);
    }
    
    /**
     * Calls a XML printer for converting a XML DOM document
     * to a String.
     * @param doc Document to be printed.
     * @param out Writer to print to.
     */
    public void getXmlText(Document doc, Writer out) {
        OutputFormat outf = new OutputFormat(doc, C_XML_ENCODING, true);
        outf.setLineWidth(C_XML_LINE_WIDTH);
        outf.setPreserveSpace(false);
        XMLSerializer serializer = new XMLSerializer(out, outf);
        try {
            serializer.serialize(doc);
        }
        catch(Exception e) {
            if(I_CmsLogChannels.C_PREPROCESSOR_IS_LOGGING && A_OpenCms.isLogging() ) {
                A_OpenCms.log(C_OPENCMS_CRITICAL, "[CmsXmlXerxesParser] " + e);
            }
        }
    }
    
    /**
     * Used to import a node from a foreign document.
     * @param doc Destination document that should import the node.
     * @param node Node to be imported.
     * @return New node that belongs to the document <code>doc</code>
     */
    public Node importNode(Document doc, Node node) {
        return importNode(doc, node, true);
    }
    
    /**
     * Imports a node form a forigan node. This method is based on the Xerces implementation
     * of the importNode method.
     * @param doc Destination document that should import the node.
     * @param source Node to be imported.
     * @param deep Recursive flag.
     * @return New node that belongs to the document <code>doc</code>
     */
    private Node importNode(Document doc, Node source, boolean deep) {
        Node newnode = null;
        int type = source.getNodeType();
        switch(type) {
          case Document.ELEMENT_NODE:
               {
                  Element newelement;
                  newelement = doc.createElement(source.getNodeName());
                  NamedNodeMap srcattr = source.getAttributes();
                  if(srcattr != null) {
                      for(int i = 0;i < srcattr.getLength();i++) {
                          Attr attr = (Attr)srcattr.item(i);
                          if(attr.getSpecified()) { // not a default attribute
                              Attr nattr = (Attr)importNode(doc, attr, true);
                              newelement.setAttributeNode(nattr);
                          }
                      }
                  }
                  newnode = newelement;
                  break;
              }
          
          case Document.ATTRIBUTE_NODE:
               {
                  newnode = doc.createAttribute(source.getNodeName());
                  newnode.setNodeValue(source.getNodeValue());
                  deep = true;
                  
                  // Kids carry value
                  break;
              }
          
          case Document.TEXT_NODE:
               {
                  newnode = doc.createTextNode(source.getNodeValue());
                  break;
              }
          
          case Document.CDATA_SECTION_NODE:
               {
                  newnode = doc.createCDATASection(source.getNodeValue());
                  break;
              }
          
          case Document.ENTITY_REFERENCE_NODE:
               {
                  break;
              }
          
          case Document.ENTITY_NODE:
               {
                  break;
              }
          
          case Document.PROCESSING_INSTRUCTION_NODE:
               {
                  newnode = doc.createProcessingInstruction(source.getNodeName(), source.getNodeValue());
                  break;
              }
          
          case Document.COMMENT_NODE:
               {
                  newnode = doc.createComment(source.getNodeValue());
                  break;
              }
          
          case Document.DOCUMENT_TYPE_NODE:
               {
                  break;
              }
          
          case Document.DOCUMENT_FRAGMENT_NODE:
               {
                  newnode = doc.createDocumentFragment();
                  
                  // No name, kids carry value
                  break;
              }
          
          case Document.NOTATION_NODE:
               {
                  break;
              }
          
          case Document.DOCUMENT_NODE: // Document can't be child of Document
          default:
               {
                  
              }
        }
        
        // If deep, replicate and attach the kids.
        if(deep) {
            for(Node srckid = source.getFirstChild();srckid != null;srckid = srckid.getNextSibling()) {
                newnode.appendChild(importNode(doc, srckid, true));
            }
        }
        if(newnode.getNodeType() == Node.ENTITY_REFERENCE_NODE || newnode.getNodeType() == Node.ENTITY_NODE) {
            
        
        //  ((NodeImpl)newnode).setReadOnly(true, true);
        }
        return newnode;
    }
    
    /**
     * Parses the given text with the Xerces parser.
     * @param in Reader with the input text.
     * @return Parsed text as DOM document.
     * @exception Exception
     */
    public Document parse(Reader in) throws Exception {
        
        //return DOMFactory.createParser(in, null).parseDocument();
        
        //DOMParser parser = new DOMParser();
        Document doc = null;
        try {
            DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
            InputSource input = new InputSource(in);
            doc = docBuilder.parse(input);
        }
        catch(SAXException e) {
            if(I_CmsLogChannels.C_PREPROCESSOR_IS_LOGGING && A_OpenCms.isLogging()  && !c_xercesWarning) {
                A_OpenCms.log(C_OPENCMS_INFO, "[CmsXmlXercesParser] Cannot set parser feature for apache xerces XML parser.");
                A_OpenCms.log(C_OPENCMS_INFO, "[CmsXmlXercesParser] This is NOT critical, but you should better use xerces 1.0.3 or higher.");
                c_xercesWarning = true;
            }
        }
        return doc;
    }
    
    /**
     * Gets a description of the parser.
     * @return Parser description.
     */
    public String toString() {
        return "Sun ProjectX XML Parser";
    }
}