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Posted to dev@commons.apache.org by sa...@apache.org on 2001/12/04 20:50:44 UTC
cvs commit: jakarta-commons/digester/src/java/org/apache/commons/digester/xmlrules FromXmlRuleSet.java
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
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*
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* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
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* if and wherever such third-party acknowlegements normally appear.
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* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
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*
* 5. Products derived from this software may not be called "Apache"
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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*
* This software consists of voluntary contributions made by many
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*/
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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