remm 2003/11/14 02:00:39
Added: catalina/src/share/org/apache/catalina/util
CatalinaDigester.java
Log:
- Extend digester to be able to do property replacement. Eventually, the
digester will also support this.
- Submitted in part by Simon Kitching.
Revision Changes Path
1.1
jakarta-tomcat-catalina/catalina/src/share/org/apache/catalina/util/CatalinaDigester.java
Index: CatalinaDigester.java
===================================================================
/*
* $Header:
/home/cvs/jakarta-tomcat-catalina/catalina/src/share/org/apache/catalina/util/CatalinaDigester.java,v
1.1 2003/11/14 10:00:39 remm Exp $
* $Revision: 1.1 $
* $Date: 2003/11/14 10:00:39 $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999 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", "Tomcat", 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 [EMAIL PROTECTED]
*
* 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/>.
*
* [Additional notices, if required by prior licensing conditions]
*
*/
package org.apache.catalina.util;
import org.apache.commons.digester.Digester;
import org.xml.sax.Attributes;
import org.xml.sax.helpers.AttributesImpl;
import org.xml.sax.SAXException;
import org.apache.tomcat.util.IntrospectionUtils;
/**
* This extended digester filters out ${...} tokens to replace them with
* matching system properties.
*
* @author Simon Kitching
* @author Remy Maucherat
*/
public class CatalinaDigester extends Digester {
// ---------------------------------------------------------- Static Fields
private static class SystemPropertySource
implements IntrospectionUtils.PropertySource {
public String getProperty( String key ) {
return System.getProperty(key);
}
}
protected static IntrospectionUtils.PropertySource source[] =
new IntrospectionUtils.PropertySource[] { new SystemPropertySource() };
// ---------------------------------------------------------------- Methods
/**
* Invoke inherited implementation after applying variable
* substitution to any attribute values containing variable
* references.
*/
public void startElement(String namespaceURI, String localName,
String qName, Attributes list)
throws SAXException {
list = updateAttributes(list);
super.startElement(namespaceURI, localName, qName, list);
}
/**
* Invoke inherited implementation after applying variable substitution
* to the character data contained in the current element.
*/
public void endElement(String namespaceURI, String localName, String qName)
throws SAXException {
bodyText = updateBodyText(bodyText);
super.endElement(namespaceURI, localName, qName);
}
/**
* Returns an attributes list which contains all the attributes
* passed in, with any text of form "${xxx}" in an attribute value
* replaced by the appropriate value from the system property.
*/
private Attributes updateAttributes(Attributes list) {
if (list.getLength() == 0) {
return list;
}
AttributesImpl newAttrs = new AttributesImpl(list);
int nAttributes = newAttrs.getLength();
for (int i = 0; i < nAttributes; ++i) {
String value = newAttrs.getValue(i);
try {
String newValue =
IntrospectionUtils.replaceProperties(value, null, source);
if (value != newValue) {
newAttrs.setValue(i, newValue);
}
}
catch (Exception e) {
// ignore - let the attribute have its original value
}
}
return newAttrs;
}
/**
* Return a new StringBuffer containing the same contents as the
* input buffer, except that data of form ${varname} have been
* replaced by the value of that var as defined in the system property.
*/
private StringBuffer updateBodyText(StringBuffer bodyText) {
String in = bodyText.toString();
String out;
try {
out = IntrospectionUtils.replaceProperties(in, null, source);
} catch(Exception e) {
return bodyText; // return unchanged data
}
if (out == in) {
// No substitutions required. Don't waste memory creating
// a new buffer
return bodyText;
} else {
return new StringBuffer(out);
}
}
}
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