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From sh...@apache.org
Subject cvs commit: jakarta-taglibs/jsptl/src/org/apache/taglibs/jsptl/tlv JsptlBaseTLV.java JsptlXmlTLV.java JsptlCoreTLV.java
Date Wed, 21 Nov 2001 03:14:24 GMT
shawn       01/11/20 19:14:24

  Modified:    jsptl/conf x.tld
               jsptl/src/org/apache/taglibs/jsptl/resources
                        Resources.properties
               jsptl/src/org/apache/taglibs/jsptl/tlv JsptlCoreTLV.java
  Added:       jsptl/src/org/apache/taglibs/jsptl/tei XmlTransformTEI.java
               jsptl/src/org/apache/taglibs/jsptl/tlv JsptlBaseTLV.java
                        JsptlXmlTLV.java
  Log:
  XML library validation.
  
  Revision  Changes    Path
  1.5       +9 -18     jakarta-taglibs/jsptl/conf/x.tld
  
  Index: x.tld
  ===================================================================
  RCS file: /home/cvs/jakarta-taglibs/jsptl/conf/x.tld,v
  retrieving revision 1.4
  retrieving revision 1.5
  diff -u -r1.4 -r1.5
  --- x.tld	2001/11/21 02:12:32	1.4
  +++ x.tld	2001/11/21 03:14:23	1.5
  @@ -10,27 +10,20 @@
     <display-name>JSTL x</display-name>
     <description>JSTL 1.0 XML library</description>
   
  -<!--
     <validator>
       <validator-class>
  -	org.apache.taglibs.jsptl.tlv.JsptlCoreTLV
  +	org.apache.taglibs.jsptl.tlv.JsptlXmlTLV
       </validator-class>
       <init-param>
   	<param-name>expressionAttributes</param-name>
   	<param-value>
  -	    expr:value
  -	    expr:default
  -	    if:test
  -	    forEach:items
  -	    forEach:begin
  -	    forEach:end
  -	    forEach:step
  -	    forTokens:items
  -	    forTokens:begin
  -	    forTokens:end
  -	    forTokens:step
  -	    set:value
  -	    when:test
  +	    parse:source
  +	    parse:filter
  +	    transform:source
  +	    transform:xslt
  +	    transform:transformer
  +	    transform:result
  +	    transformer:xslt
   	</param-value>
   	<description>
   	    Whitespace-separated list of colon-separated token pairs
  @@ -43,16 +36,13 @@
   	Provides core validation features for JSPTL tags.
       </description>
     </validator>
  --->
   
     <!-- The validator also listens in order to recover a context parameter -->
  -<!--
     <listener>
       <listener-class>
   	org.apache.taglibs.jsptl.tlv.JsptlCoreTLVHelper
       </listener-class>
     </listener>
  --->
   
     <tag>
       <name>choose</name>
  @@ -207,6 +197,7 @@
     <tag>
       <name>transform</name>
       <tag-class>org.apache.taglibs.jsptl.tag.jx.XmlTransformTag</tag-class>
  +    <tei-class>org.apache.taglibs.jsptl.tei.XmlTransformTEI</tei-class>
       <body-content>JSP</body-content>
       <description>
   	Conducts a transformation given a source XML document
  
  
  
  1.7       +5 -5      jakarta-taglibs/jsptl/src/org/apache/taglibs/jsptl/resources/Resources.properties
  
  Index: Resources.properties
  ===================================================================
  RCS file: /home/cvs/jakarta-taglibs/jsptl/src/org/apache/taglibs/jsptl/resources/Resources.properties,v
  retrieving revision 1.6
  retrieving revision 1.7
  diff -u -r1.6 -r1.7
  --- Resources.properties	2001/11/21 01:22:59	1.6
  +++ Resources.properties	2001/11/21 03:14:23	1.7
  @@ -132,7 +132,7 @@
   # Generic errors
   
   TLV_ILLEGAL_BODY=\
  -    Encountered illegal body of &lt;{0}:{1}&gt; tag, given its attributes.
  +    Encountered illegal body of &lt;{0}&gt; tag, given its attributes.
   
   TLV_MISSING_BODY=\
       A body is necessary inside the &lt;{0}&gt; tag, given its attributes.
  @@ -146,8 +146,8 @@
   
   # Errors customized to particular tags (sort of)  :-)
   
  -TLV_ILLEGAL_CHOOSE_ORDER=\
  -    Illegal &lt;{0}gt; after &lt;{1}:{2}&gt; in &lt;{1}:{3}&gt;.
  +TLV_ILLEGAL_ORDER=\
  +    Illegal &lt;{0}&gt; after &lt;{1}:{2}&gt; in &lt;{1}:{3}&gt;.
   
  -TLV_ILLEGAL_IMPORT_PARAM=\
  -    Illegal &lt;{0}:{1}&gt; tag within &lt;{0}:{2} {3}="..."gt;.
  +TLV_ILLEGAL_PARAM=\
  +    Illegal &lt;{0}:{1}&gt; tag within &lt;{0}:{2} {3}="..."&gt;.
  
  
  
  1.1                  jakarta-taglibs/jsptl/src/org/apache/taglibs/jsptl/tei/XmlTransformTEI.java
  
  Index: XmlTransformTEI.java
  ===================================================================
  /*
   * 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 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.taglibs.jsptl.tei;
  
  import javax.servlet.jsp.tagext.*;
  
  /**
   * <p>An implementation of TagExtraInfo that implements validation for
   * ForEachTag's attributes</p>
   *
   * @author Shawn Bayern
   */
  public class XmlTransformTEI extends TagExtraInfo {
  
      final private static String RESULT = "result";
      final private static String TRANSFORMER = "transformer";
      final private static String VAR = "var";
      final private static String XSLT = "xslt";
  
      /*
       * Currently implements the following rules:
       * 
       * - If 'items' is not specified, 'begin' and 'end' must be
       */
      public boolean isValid(TagData us) {
  	// disallow both XSLT and TRANSFORMER
  	if (Util.isSpecified(us, XSLT) && Util.isSpecified(us, TRANSFORMER))
  	    return false;
  
  	// disallow both VAR and RESULT
  	if (Util.isSpecified(us, VAR) && Util.isSpecified(us, RESULT))
  	    return false;
          return true;
      }
  
  }
  
  
  
  1.8       +12 -169   jakarta-taglibs/jsptl/src/org/apache/taglibs/jsptl/tlv/JsptlCoreTLV.java
  
  Index: JsptlCoreTLV.java
  ===================================================================
  RCS file: /home/cvs/jakarta-taglibs/jsptl/src/org/apache/taglibs/jsptl/tlv/JsptlCoreTLV.java,v
  retrieving revision 1.7
  retrieving revision 1.8
  diff -u -r1.7 -r1.8
  --- JsptlCoreTLV.java	2001/11/19 04:18:07	1.7
  +++ JsptlCoreTLV.java	2001/11/21 03:14:23	1.8
  @@ -67,8 +67,8 @@
   import org.apache.taglibs.jsptl.resources.Resources;
   
   /**
  - * <p>A SAX-based TagLibraryValidator for the 'jx' version of JSPTL.
  - * Current implements the following checks:</p>
  + * <p>A SAX-based TagLibraryValidator for the core JSTL tag library.
  + * Currently implements the following checks:</p>
    * 
    * <ul>
    *   <li>Expression syntax validation, with full support for
  @@ -79,11 +79,12 @@
    *      'value' is specified; it *must* have a body otherwise.)  For
    *      these purposes, "having a body" refers to non-whitespace
    *      content inside the tag.</li>
  + *   <li>Other minor constraints.</li>
    * </ul>
    * 
    * @author Shawn Bayern
    */
  -public class JsptlCoreTLV extends TagLibraryValidator {
  +public class JsptlCoreTLV extends JsptlBaseTLV {
   
       //*********************************************************************
       // Implementation Overview
  @@ -124,36 +125,15 @@
       private final String DEFAULT = "default";
       private final String VAR_READER = "varReader";
   
  -    // parameter names
  -    private final String EXP_ATT_PARAM = "expressionAttributes";
   
       //*********************************************************************
  -    // Validation and configuration state (private)
  +    // Contract fulfillment
   
  -    private String prefix;			// our taglib's prefix
  -    private Vector messageVector;		// temporary error messages
  -    private Map config;				// configuration (Map of Sets)
  -
  -    //*********************************************************************
  -    // Constructor and lifecycle management
  -
  -    public JsptlCoreTLV() {
  -	super();
  -	init();
  +    protected DefaultHandler getHandler() {
  +	return new Handler();
       }
   
  -    private void init() {
  -	messageVector = null;
  -	prefix = null;
  -	config = null;
  -    }
   
  -    public void release() {
  -	super.release();
  -	init();
  -    }
  -    
  -
       //*********************************************************************
       // SAX event handler
   
  @@ -168,8 +148,6 @@
   	private Stack importWithReaderDepths = new Stack();
   	private Stack importWithoutReaderDepths = new Stack();
   	private String lastElementName = null;
  -	private String lastElementId = null;
  -	private boolean failed = false;
   	private boolean bodyNecessary = false;
   	private boolean bodyIllegal = false;
   	private boolean lastImportHadReader = false;
  @@ -192,8 +170,7 @@
   
   	    // check body-related constraint
   	    if (bodyIllegal)
  -		fail(Resources.getMessage("TLV_ILLEGAL_BODY",
  -		    prefix, lastElementName));
  +		fail(Resources.getMessage("TLV_ILLEGAL_BODY", lastElementName));
   
   	    // temporarily "install" new expression language if appropriate
   	    if (isTag(qn, EXPLANG))
  @@ -231,7 +208,7 @@
   
   		// make sure <otherwise> is the last tag
   		if (((Boolean) chooseHasOtherwise.peek()).booleanValue()) {
  -		   fail(Resources.getMessage("TLV_ILLEGAL_CHOOSE_ORDER",
  +		   fail(Resources.getMessage("TLV_ILLEGAL_ORDER",
   			qn, prefix, OTHERWISE, CHOOSE));
   		}
   		if (isTag(qn, OTHERWISE)) {
  @@ -246,7 +223,7 @@
   		// we're in an <import varReader="..."> tag, where
   		// <param> tags are illegal
   		if (isTag(qn, PARAM)) {
  -		    fail(Resources.getMessage("TLV_ILLEGAL_IMPORT_PARAM",
  +		    fail(Resources.getMessage("TLV_ILLEGAL_PARAM",
   			prefix, PARAM, IMPORT, VAR_READER));
   		}
   	    }
  @@ -312,14 +289,13 @@
   
   	    // check and update body-related constraints
   	    if (bodyIllegal)
  -		fail(Resources.getMessage("TLV_ILLEGAL_BODY",
  -		    prefix, lastElementName));
  +		fail(Resources.getMessage("TLV_ILLEGAL_BODY", lastElementName));
   	    bodyNecessary = false;		// body is no longer necessary!
   	    if (!importWithoutReaderDepths.empty()) {
   		// we're in an <import> without a Reader; nothing but
   		// <param> is allowed
   		fail(Resources.getMessage("TLV_ILLEGAL_BODY",
  -		    prefix, IMPORT));
  +		    prefix + ":" + IMPORT));
   	    }
   
   	    // make sure <choose> has no non-whitespace text
  @@ -366,144 +342,11 @@
   	    depth--;
   	}
   
  -	// utility method to help us match elements in our tagset
  -	private boolean isTag(String qn, String unqualifiedName) {
  -	    return (qn.equals(prefix + ":" + unqualifiedName));
  -	}
  -
  -	// utility method to determine if an attribute exists
  -	private boolean hasAttribute(Attributes a, String att) {
  -	    return (a.getValue(att) != null);
  -	}
  -
   	// are we directly under a <choose>?
   	private boolean chooseChild() {
   	    return (!chooseDepths.empty()
   		&& (depth - 1) == ((Integer) chooseDepths.peek()).intValue());
   	}
   
  -	/*
  -	 * method to assist with failure [ as if it's not easy enough
  -	 * already :-) ]
  -	 */
  -        private void fail(String message) {
  -	    failed = true;
  -	    JsptlCoreTLV.this.messageVector.add(
  -		new ValidationMessage(lastElementId, message));
  -	}
  -
  -    }
  -
  -    //*********************************************************************
  -    // Validation entry point
  -
  -    public synchronized ValidationMessage[] validate(
  -	    String prefix, String uri, PageData page) {
  -	try {
  -
  -	    // initialize
  -	    messageVector = new Vector();
  -
  -	    // save the prefix
  -	    this.prefix = prefix;
  -
  -	    // parse parameters if necessary
  -	    try {
  -		if (config == null)
  -		    configure((String) getInitParameters().get(EXP_ATT_PARAM));
  -	    } catch (NoSuchElementException ex) {
  -		// parsing error
  -	        return vmFromString(
  -		    Resources.getMessage("TLV_PARAMETER_ERROR",
  -			EXP_ATT_PARAM));
  -	    }
  -
  -	    // get a handler
  -	    Handler h = new Handler();
  -
  -	    // parse the page
  -	    SAXParserFactory f = SAXParserFactory.newInstance();
  -	    f.setValidating(true);
  -	    SAXParser p = f.newSAXParser();
  -	    p.parse(page.getInputStream(), h);
  -
  -	    if (messageVector.size() == 0)
  -		return null;
  -	    else
  -		return vmFromVector(messageVector);
  -
  -	} catch (SAXException ex) {
  -	    return vmFromString(ex.toString());
  -	} catch (ParserConfigurationException ex) {
  -	    return vmFromString(ex.toString());
  -	} catch (IOException ex) {
  -	    return vmFromString(ex.toString());
  -	}
  -    }
  -
  -
  -    //*********************************************************************
  -    // Private utility functions
  -
  -    // parses our configuration parameter for element:attribute pairs
  -    private void configure(String info) {
  -        // construct our configuration map
  -	config = new HashMap();
  -
  -	// leave the map empty if we have nothing to configure
  -	if (info == null)
  -	    return;
  -
  -	// separate parameter into space-separated tokens and store them
  -	StringTokenizer st = new StringTokenizer(info);
  -	while (st.hasMoreTokens()) {
  -	    String pair = st.nextToken();
  -	    StringTokenizer pairTokens = new StringTokenizer(pair, ":");
  -	    String element = pairTokens.nextToken();
  -	    String attribute = pairTokens.nextToken();
  -	    Object atts = config.get(element);
  -	    if (atts == null) {
  -	        atts = new HashSet();
  -	        config.put(element, atts);
  -	    }
  -	    ((Set) atts).add(attribute);
  -	}
  -    }
  -
  -    // delegate validation to the appropriate expression language
  -    private String validateExpression(String evaluator,
  -	    String elem, String att, String expr) {
  -
  -	// let's just use the cache kept by the ExpressionEvaluatorManager
  -	ExpressionEvaluator current;
  -	try {
  -	    current =
  -	        ExpressionEvaluatorManager.getEvaluatorByName(evaluator);
  -	} catch (JspException ex) {
  -	    // (using JspException here feels ugly, but it's what EEM uses)
  -	    return ex.getMessage();
  -	}
  -	
  -	String response = current.validate(att, expr);
  -	if (response == null)
  -	    return response;
  -	else
  -	    return "&lt;" + elem + "&gt; / attribute = '" + att + "': "
  -		+ response;
  -    }
  -
  -    // constructs a ValidationMessage[] from a single String and no ID
  -    static ValidationMessage[] vmFromString(String message) {
  -	return new ValidationMessage[] {
  -	    new ValidationMessage(null, message)
  -	};
  -    }
  -
  -    // constructs a ValidationMessage[] from a ValidationMessage Vector
  -    static ValidationMessage[] vmFromVector(Vector v) {
  -	ValidationMessage[] vm = new ValidationMessage[v.size()];
  -	for (int i = 0; i < vm.length; i++)
  -	   vm[i] = (ValidationMessage) v.get(i);
  -	return vm;
       }
   }
  
  
  
  1.1                  jakarta-taglibs/jsptl/src/org/apache/taglibs/jsptl/tlv/JsptlBaseTLV.java
  
  Index: JsptlBaseTLV.java
  ===================================================================
  /*
   * 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 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.taglibs.jsptl.tlv;
  
  import java.io.*;
  import java.util.*;
  import javax.servlet.jsp.*;
  import javax.servlet.jsp.tagext.*;
  import javax.xml.parsers.*;
  import org.xml.sax.*;
  import org.xml.sax.helpers.*;
  import org.apache.taglibs.jsptl.lang.support.ExpressionEvaluator;
  import org.apache.taglibs.jsptl.lang.support.ExpressionEvaluatorManager;
  import org.apache.taglibs.jsptl.resources.Resources;
  
  /**
   * <p>A base class to support SAX-based validation in JSTL.</p>
   * 
   * @author Shawn Bayern
   */
  public abstract class JsptlBaseTLV extends TagLibraryValidator {
  
      //*********************************************************************
      // Implementation Overview
  
      /*
       * We essentially just run the page through a SAX parser, handling
       * the callbacks that interest us.  The SAX parser is supplied by
       * subclasses using the protected getHandler() method.
       */
  
      protected abstract DefaultHandler getHandler();
  
  
      //*********************************************************************
      // Constants
  
      // parameter names
      private final String EXP_ATT_PARAM = "expressionAttributes";
  
  
      //*********************************************************************
      // Validation and configuration state (protected)
  
      protected String prefix;			// our taglib's prefix
      protected Vector messageVector;		// temporary error messages
      protected Map config;			// configuration (Map of Sets)
      protected boolean failed;			// have we failed >0 times?
      protected String lastElementId;		// the last element we've seen
  
      //*********************************************************************
      // Constructor and lifecycle management
  
      public JsptlBaseTLV() {
  	super();
  	init();
      }
  
      private void init() {
  	messageVector = null;
  	prefix = null;
  	config = null;
      }
  
      public void release() {
  	super.release();
  	init();
      }
      
  
      //*********************************************************************
      // Validation entry point
  
      public synchronized ValidationMessage[] validate(
  	    String prefix, String uri, PageData page) {
  	try {
  
  	    // initialize
  	    messageVector = new Vector();
  
  	    // save the prefix
  	    this.prefix = prefix;
  
  	    // parse parameters if necessary
  	    try {
  		if (config == null)
  		    configure((String) getInitParameters().get(EXP_ATT_PARAM));
  	    } catch (NoSuchElementException ex) {
  		// parsing error
  	        return vmFromString(
  		    Resources.getMessage("TLV_PARAMETER_ERROR",
  			EXP_ATT_PARAM));
  	    }
  
  	    // get a handler
  	    DefaultHandler h = getHandler();
  
  	    // parse the page
  	    SAXParserFactory f = SAXParserFactory.newInstance();
  	    f.setValidating(true);
  	    SAXParser p = f.newSAXParser();
  	    p.parse(page.getInputStream(), h);
  
  	    if (messageVector.size() == 0)
  		return null;
  	    else
  		return vmFromVector(messageVector);
  
  	} catch (SAXException ex) {
  	    return vmFromString(ex.toString());
  	} catch (ParserConfigurationException ex) {
  	    return vmFromString(ex.toString());
  	} catch (IOException ex) {
  	    return vmFromString(ex.toString());
  	}
      }
  
      //*********************************************************************
      // Protected utility functions
  
      // delegate validation to the appropriate expression language
      protected String validateExpression(String evaluator,
  	    String elem, String att, String expr) {
  
  	// let's just use the cache kept by the ExpressionEvaluatorManager
  	ExpressionEvaluator current;
  	try {
  	    current =
  	        ExpressionEvaluatorManager.getEvaluatorByName(evaluator);
  	} catch (JspException ex) {
  	    // (using JspException here feels ugly, but it's what EEM uses)
  	    return ex.getMessage();
  	}
  	
  	String response = current.validate(att, expr);
  	if (response == null)
  	    return response;
  	else
  	    return "&lt;" + elem + "&gt; / attribute = '" + att + "': "
  		+ response;
      }
  
      // utility method to help us match elements in our tagset
      protected boolean isTag(String qn, String unqualifiedName) {
          return (qn.equals(prefix + ":" + unqualifiedName));
      }
  
      // utility method to determine if an attribute exists
      protected boolean hasAttribute(Attributes a, String att) {
          return (a.getValue(att) != null);
      }
  
      /*
       * method to assist with failure [ as if it's not easy enough
       * already :-) ]
       */
      protected void fail(String message) {
          failed = true;
          messageVector.add(new ValidationMessage(lastElementId, message));
      }
  
  
      //*********************************************************************
      // Private utility functions
  
      // parses our configuration parameter for element:attribute pairs
      private void configure(String info) {
          // construct our configuration map
  	config = new HashMap();
  
  	// leave the map empty if we have nothing to configure
  	if (info == null)
  	    return;
  
  	// separate parameter into space-separated tokens and store them
  	StringTokenizer st = new StringTokenizer(info);
  	while (st.hasMoreTokens()) {
  	    String pair = st.nextToken();
  	    StringTokenizer pairTokens = new StringTokenizer(pair, ":");
  	    String element = pairTokens.nextToken();
  	    String attribute = pairTokens.nextToken();
  	    Object atts = config.get(element);
  	    if (atts == null) {
  	        atts = new HashSet();
  	        config.put(element, atts);
  	    }
  	    ((Set) atts).add(attribute);
  	}
      }
  
      // constructs a ValidationMessage[] from a single String and no ID
      static ValidationMessage[] vmFromString(String message) {
  	return new ValidationMessage[] {
  	    new ValidationMessage(null, message)
  	};
      }
  
      // constructs a ValidationMessage[] from a ValidationMessage Vector
      static ValidationMessage[] vmFromVector(Vector v) {
  	ValidationMessage[] vm = new ValidationMessage[v.size()];
  	for (int i = 0; i < vm.length; i++)
  	   vm[i] = (ValidationMessage) v.get(i);
  	return vm;
      }
  }
  
  
  
  1.1                  jakarta-taglibs/jsptl/src/org/apache/taglibs/jsptl/tlv/JsptlXmlTLV.java
  
  Index: JsptlXmlTLV.java
  ===================================================================
  /*
   * 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 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.taglibs.jsptl.tlv;
  
  import java.io.*;
  import java.util.*;
  import javax.servlet.jsp.*;
  import javax.servlet.jsp.tagext.*;
  import javax.xml.parsers.*;
  import org.xml.sax.*;
  import org.xml.sax.helpers.*;
  import org.apache.taglibs.jsptl.lang.support.ExpressionEvaluator;
  import org.apache.taglibs.jsptl.lang.support.ExpressionEvaluatorManager;
  import org.apache.taglibs.jsptl.resources.Resources;
  
  /**
   * <p>A SAX-based TagLibraryValidator for the JSTL XML library.
   * Currently implements the following checks:</p>
   * 
   * <ul>
   *   <li>Expression syntax validation, with full support for
   *      &lt;jx:expressionLanguage&gt;</li>
   *   <li>Choose / when / otherwise constraints</li>
   *   <li>Tag bodies that must either be empty or non-empty given
   *      particular attributes.</li>
   *   <li>Other minor constraints.</li>
   * </ul>
   * 
   * @author Shawn Bayern
   */
  public class JsptlXmlTLV extends JsptlBaseTLV {
  
      //*********************************************************************
      // Implementation Overview
  
      /*
       * We essentially just run the page through a SAX parser, handling
       * the callbacks that interest us.  We collapse <jsp:text> elements
       * into the text they contain, since this simplifies processing
       * somewhat.  Even a quick glance at the implementation shows its
       * necessary, tree-oriented nature:  multiple Stacks, an understanding
       * of 'depth', and so on all are important as we recover necessary
       * state upon each callback.  This TLV demonstrates various techniques,
       * from the general "how do I use a SAX parser for a TLV?" to
       * "how do I read my init parameters and then validate?"  But also,
       * the specific SAX methodology was kept as general as possible to
       * allow for experimentation and flexibility.
       *
       * Much of the code and structure is duplicated from JsptlCoreTLV.
       * An effort has been made to re-use code where unambiguously useful.
       * However, splitting logic among parent/child classes isn't the
       * cleanest approach when writing a parser like the one we need.
       */
  
  
      //*********************************************************************
      // Constants
  
      // tag names
      private final String CHOOSE = "choose";
      private final String WHEN = "when";
      private final String OTHERWISE = "otherwise";
      private final String PARSE = "parse";
      private final String PARAM = "param";
      private final String TRANSFORM = "transform";
      private final String EXPLANG = "expressionLanguage";
      private final String JSP_TEXT = "jsp:text";
  
      // attribute names
      private final String EVAL = "evaluator";
      private final String VALUE = "value";
      private final String SOURCE = "source";
  
  
      //*********************************************************************
      // Contract fulfillment
  
      protected DefaultHandler getHandler() {
  	return new Handler();
      }
  
  
      //*********************************************************************
      // SAX event handler
  
      /** The handler that provides the base of our implementation. */
      private class Handler extends DefaultHandler {
  
  	// parser state
  	private int depth = 0;
  	private Stack chooseDepths = new Stack();
  	private Stack chooseHasOtherwise = new Stack();
  	private Stack expressionLanguage = new Stack();
  	private String lastElementName = null;
  	private boolean bodyNecessary = false;
  	private boolean bodyIllegal = false;
  
  	public Handler() {
  	    // "install" the default evaluator
  	    String defaultEvaluator = JsptlCoreTLVHelper.getEvaluatorName();
  	    if (defaultEvaluator != null)
  		expressionLanguage.push(defaultEvaluator);
  	}
  
  	// process under the existing context (state), then modify it
  	public void startElement(
  	        String ns, String ln, String qn, Attributes a) {
  
  	    // for simplicity, we can ignore <jsp:text> for our purposes
  	    // (don't bother distinguishing between it and its characters)
  	    if (qn.equals(JSP_TEXT))
  		return;
  
  	    // check body-related constraint
  	    if (bodyIllegal)
  		fail(Resources.getMessage("TLV_ILLEGAL_BODY", lastElementName));
  
  	    // temporarily "install" new expression language if appropriate
  	    if (isTag(qn, EXPLANG))
  		expressionLanguage.push(a.getValue(EVAL));
  
  	    // validate expression syntax if we need to
  	    Set expAtts;
  	    if (qn.startsWith(prefix + ":")
  		    && (expAtts = (Set) config.get(ln)) != null) {
  		for (int i = 0; i < a.getLength(); i++) {
  		    String attName = a.getLocalName(i);
  		    if (expAtts.contains(attName)) {
  			if (expressionLanguage.empty())
  			    fail("Unexpected failure to determine "
  				+ "expression language.");
  			String vMsg =
  			    validateExpression(
  				(String) expressionLanguage.peek(),
  				ln,
  				attName,
  				a.getValue(i));
  			if (vMsg != null)
  			    fail(vMsg);
  		    }
  		}
  	    }
  
  	    // check invariants for <choose>
  	    if (chooseChild()) {
  		// ensure <choose> has the right children
  		if(!isTag(qn, WHEN) && !isTag(qn, OTHERWISE)) {
  		    fail(Resources.getMessage("TLV_ILLEGAL_CHILD_TAG",
  			prefix, CHOOSE, qn));
  		}
  
  		// make sure <otherwise> is the last tag
  		if (((Boolean) chooseHasOtherwise.peek()).booleanValue()) {
  		   fail(Resources.getMessage("TLV_ILLEGAL_ORDER",
  			qn, prefix, OTHERWISE, CHOOSE));
  		}
  		if (isTag(qn, OTHERWISE)) {
  		    chooseHasOtherwise.pop();
  		    chooseHasOtherwise.push(new Boolean(true));
  		}
  
  	    }
  
  	    // now, modify state
  
  	    // we're a choose, so record new choose-specific state
  	    if (isTag(qn, CHOOSE)) {
  		chooseDepths.push(new Integer(depth));
  		chooseHasOtherwise.push(new Boolean(false));
  	    }
  
  	    // set up a check against illegal attribute/body combinations
  	    bodyIllegal = false;
  	    bodyNecessary = false;
  	    if (isTag(qn, PARSE) || isTag(qn, TRANSFORM)) {
  		if (hasAttribute(a, SOURCE))
  		    bodyIllegal = true;
  	    } else if (isTag(qn, PARAM)) {
  		if (hasAttribute(a, VALUE))
  		    bodyIllegal = true;
  		else
  		    bodyNecessary = true;
  	    }
  
  	    // record the most recent tag (for error reporting)
  	    lastElementName = qn;
  	    lastElementId = a.getValue("id");
  
  	    // we're a new element, so increase depth
  	    depth++;
  	}
  
  	public void characters(char[] ch, int start, int length) {
  
  	    // ignore strings that are just whitespace
  	    String s = new String(ch, start, length).trim();
  	    if (s.equals(""))
  		return;
  
  	    // check and update body-related constraints
  	    if (bodyIllegal)
  		fail(Resources.getMessage("TLV_ILLEGAL_BODY", lastElementName));
  	    bodyNecessary = false;		// body is no longer necessary!
  
  	    // make sure <choose> has no non-whitespace text
  	    if (chooseChild()) {
  		String msg = 
  		    Resources.getMessage("TLV_ILLEGAL_TEXT_BODY",
  			prefix, CHOOSE,
  			(s.length() < 7 ? s : s.substring(0,7)));
  		fail(msg);
  	    }
  	}
  
  	public void endElement(String ns, String ln, String qn) {
  
  	    // consistently, we ignore JSP_TEXT
  	    if (qn.equals(JSP_TEXT))
  		return;
  
  	    // handle body-related invariant
  	    if (bodyNecessary)
  		fail(Resources.getMessage("TLV_MISSING_BODY",
  		    lastElementName));
  	    bodyIllegal = false;	// reset: we've left the tag
  
  	    // update <choose>-related state
  	    if (isTag(qn, CHOOSE)) {
  		chooseDepths.pop();
  		chooseHasOtherwise.pop();
  	    }
  
  	    // update language state
  	    if (isTag(qn, EXPLANG))
  		expressionLanguage.pop();
  
  	    // update our depth
  	    depth--;
  	}
  
  	// are we directly under a <choose>?
  	private boolean chooseChild() {
  	    return (!chooseDepths.empty()
  		&& (depth - 1) == ((Integer) chooseDepths.peek()).intValue());
  	}
  
      }
  }
  
  
  

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