xmlparserfactory.java

Nano的XML解析器

/* XMLParserFactory.java                                           NanoXML/Java
 *
 * $Revision: 1.3 $
 * $Date: 2002/01/04 21:03:29 $
 * $Name: RELEASE_2_2_1 $
 *
 * This file is part of NanoXML 2 for Java.
 * Copyright (C) 2000-2002 Marc De Scheemaecker, All Rights Reserved.
 *
 * This software is provided 'as-is', without any express or implied warranty.
 * In no event will the authors be held liable for any damages arising from the
 * use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 *  1. The origin of this software must not be misrepresented; you must not
 *     claim that you wrote the original software. If you use this software in
 *     a product, an acknowledgment in the product documentation would be
 *     appreciated but is not required.
 *
 *  2. Altered source versions must be plainly marked as such, and must not be
 *     misrepresented as being the original software.
 *
 *  3. This notice may not be removed or altered from any source distribution.
 */

package net.n3.nanoxml;


import java.io.IOException;


/**
 * Creates an XML parser.
 *
 * @author Marc De Scheemaecker
 * @version $Name: RELEASE_2_2_1 $, $Revision: 1.3 $
 */
public class XMLParserFactory
{

   /**
    * The class name of the default XML parser.
    */
   public static final String DEFAULT_CLASS = "net.n3.nanoxml.StdXMLParser";


   /**
    * The Java properties key of the XML parser class name.
    */
   public static final String CLASS_KEY = "net.n3.nanoxml.XMLParser";


   /**
    * Creates a default parser.
    *
    * @see #DEFAULT_CLASS
    * @see #CLASS_KEY
    *
    * @return the non-null parser.
    *
    * @throws java.lang.ClassNotFoundException
    *		if the class of the parser or validator could not be found.
    * @throws java.lang.InstantiationException
    *		if the parser could not be created
    * @throws java.lang.IllegalAccessException
    *		if the parser could not be created
    */
   public static IXMLParser createDefaultXMLParser()
      throws ClassNotFoundException,
             InstantiationException,
             IllegalAccessException
   {
      String className = System.getProperty(XMLParserFactory.CLASS_KEY,
                                            XMLParserFactory.DEFAULT_CLASS);
      return XMLParserFactory.createXMLParser(className,
                                              new StdXMLBuilder());
   }


   /**
    * Creates a default parser.
    *
    * @see #DEFAULT_CLASS
    * @see #CLASS_KEY
    *
    * @param builder the XML builder.
    *
    * @return the non-null parser.
    *
    * @throws java.lang.ClassNotFoundException
    *		if the class of the parser could not be found.
    * @throws java.lang.InstantiationException
    *		if the parser could not be created
    * @throws java.lang.IllegalAccessException
    *		if the parser could not be created
    */
   public static IXMLParser createDefaultXMLParser(IXMLBuilder builder)
      throws ClassNotFoundException,
             InstantiationException,
             IllegalAccessException
   {
      String className = System.getProperty(XMLParserFactory.CLASS_KEY,
                                            XMLParserFactory.DEFAULT_CLASS);
      return XMLParserFactory.createXMLParser(className, builder);
   }


   /**
    * Creates a parser.
    *
    * @param className the name of the class of the XML parser
    * @param builder the XML builder.
    *
    * @return the non-null parser.
    *
    * @throws java.lang.ClassNotFoundException
    *		if the class of the parser could not be found.
    * @throws java.lang.InstantiationException
    *		if the parser could not be created
    * @throws java.lang.IllegalAccessException
    *		if the parser could not be created
    */
   public static IXMLParser createXMLParser(String      className,
                                            IXMLBuilder builder)
      throws ClassNotFoundException,
             InstantiationException,
             IllegalAccessException
   {
      Class cls = Class.forName(className);
      IXMLParser parser = (IXMLParser) cls.newInstance();
      parser.setBuilder(builder);
      parser.setValidator(new NonValidator());
      return parser;
   }

}