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From sand...@apache.org
Subject cvs commit: jakarta-commons/digester/src/java/org/apache/commons/digester/xmlrules FromXmlRuleSet.java
Date Tue, 04 Dec 2001 19:50:44 GMT
sanders     01/12/04 11:50:44

  Added:       digester/src/java/org/apache/commons/digester/xmlrules
                        FromXmlRuleSet.java
  Log:
  XML Rules definition
  Graciously submitted by Dave Martin [dmartin@altoweb.com]
  
  Revision  Changes    Path
  1.1                  jakarta-commons/digester/src/java/org/apache/commons/digester/xmlrules/FromXmlRuleSet.java
  
  Index: FromXmlRuleSet.java
  ===================================================================
  /*
   * ====================================================================
   *
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 1999-2001 The Apache Software Foundation.  All rights
   * reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. The end-user documentation included with the redistribution, if
   *    any, must include the following acknowlegement:
   *       "This product includes software developed by the
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowlegement may appear in the software itself,
   *    if and wherever such third-party acknowlegements normally appear.
   *
   * 4. The names "The Jakarta Project", "Commons", and "Apache Software
   *    Foundation" must not be used to endorse or promote products derived
   *    from this software without prior written permission. For written
   *    permission, please contact apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache"
   *    nor may "Apache" appear in their names without prior written
   *    permission of the Apache Group.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  
  
  package org.apache.commons.digester.xmlrules;
  
  
  import java.io.BufferedInputStream;
  import java.io.FileInputStream;
  import java.io.FileNotFoundException;
  import java.io.InputStream;
  import java.io.IOException;
  import java.io.PrintWriter;
  import java.net.URL;
  import java.util.HashMap;
  import java.util.HashSet;
  import java.util.Iterator;
  import java.util.Map;
  import java.util.Set;
  import java.util.Stack;
  import org.apache.commons.digester.Digester;
  import org.apache.commons.digester.RuleSetBase;
  import org.xml.sax.InputSource;
  import org.xml.sax.SAXException;
  
  /**
   * A Digester rule set where the rules come from an XML file.
   *
   * @author David H. Martin - Initial Contribution
   * @author Scott Sanders   - Added ASL, removed external dependencies
   */
  public class FromXmlRuleSet extends RuleSetBase {
  
      public static final String DIGESTER_DTD_PATH = "org/apache/commons/digester/xmlrules/digester-rules.dtd";
  
      /**
       * The file containing the Digester rules, in XML.
       */
      private URL xmlRules;
  
      /**
       * The rule set for parsing the Digester rules
       */
      private DigesterRuleParser parser;
      
      /**
       * Constructs a FromXmlRuleSet using the default DigesterRuleParser
       * @param rulesXml the path to the XML document defining the Digester rules
       */
      public FromXmlRuleSet(URL rulesXml) {
          this(rulesXml, new DigesterRuleParser());
      }
  
      /**
       * @param rulesXml the path to the XML document defining the Digester rules
       * @param parser an instance of DigesterRuleParser, for parsing the rules from XML
       */
      public FromXmlRuleSet(URL rulesXml, DigesterRuleParser parser) {
          xmlRules = rulesXml;
          this.parser = parser;
      }
      
      /**
       * Adds to the digester the set of Rule instances defined in the
       * XML file for this rule set.  
       * @see org.apache.commons.digester.RuleSetBase
       */
      public void addRuleInstances(org.apache.commons.digester.Digester digester) throws XmlLoadException
{
          URL dtdURL = getClass().getClassLoader().getResource(DIGESTER_DTD_PATH);
          if (dtdURL == null) {
              throw new XmlLoadException("Cannot find resource \"" + 
                  DIGESTER_DTD_PATH + "\"");
          }
          parser.setDigesterRulesDTD(dtdURL.toString());
          parser.setTarget(digester);
          
          Digester rulesDigester = new Digester();
          
          rulesDigester.setDebug(0);
          
          // fix the rules digester's logging behavior. If debug==0, logs nothing
          // not even exception stack traces. If debug>0, log messages go to stderr.
          rulesDigester.setWriter(new PrintWriter(new NullLogWriter(rulesDigester)));
          rulesDigester.addRuleSet(parser);
  
          rulesDigester.push(parser);
          try {
              rulesDigester.parse(xmlRules.openStream());
          } catch (Exception ex) {
              throw new XmlLoadException(ex);
          }
      }
  
  }
  
  
  
  

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