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From jstrac...@apache.org
Subject cvs commit: jakarta-commons/jelly/src/java/org/apache/commons/jelly/tags/core ParseTag.java CoreTagLibrary.java
Date Thu, 06 Mar 2003 11:50:42 GMT
jstrachan    2003/03/06 03:50:42

  Modified:    jelly/src/java/org/apache/commons/jelly/tags/core
                        CoreTagLibrary.java
  Added:       jelly/src/java/org/apache/commons/jelly/tags/core
                        ParseTag.java
  Log:
  added a first cut of a parse tag that can be used to parse a Jelly script from a string
or from the output of its body
  
  <j:parse text="${foo}"/>
  
  or
  
  <j:parse>
  	<!-- something that generates XML -->
  </j:parse>
  
  if a var attribute is speciried then the scirpt is defined; otherwise its executed
  
  Revision  Changes    Path
  1.27      +6 -5      jakarta-commons/jelly/src/java/org/apache/commons/jelly/tags/core/CoreTagLibrary.java
  
  Index: CoreTagLibrary.java
  ===================================================================
  RCS file: /home/cvs/jakarta-commons/jelly/src/java/org/apache/commons/jelly/tags/core/CoreTagLibrary.java,v
  retrieving revision 1.26
  retrieving revision 1.27
  diff -u -r1.26 -r1.27
  --- CoreTagLibrary.java	19 Feb 2003 07:45:07 -0000	1.26
  +++ CoreTagLibrary.java	6 Mar 2003 11:50:41 -0000	1.27
  @@ -102,6 +102,7 @@
           registerTag("invoke", InvokeTag.class);
           registerTag("invokeStatic", InvokeStaticTag.class);
           registerTag("new", NewTag.class);
  +        registerTag("parse", ParseTag.class);
           registerTag("scope", ScopeTag.class);
           registerTag("setProperties", SetPropertiesTag.class);
           registerTag("thread", ThreadTag.class);
  
  
  
  1.1                  jakarta-commons/jelly/src/java/org/apache/commons/jelly/tags/core/ParseTag.java
  
  Index: ParseTag.java
  ===================================================================
  /*
   * $Header: /home/cvs/jakarta-commons/jelly/src/java/org/apache/commons/jelly/tags/core/ParseTag.java,v
1.1 2003/03/06 11:50:41 jstrachan Exp $
   * $Revision: 1.1 $
   * $Date: 2003/03/06 11:50:41 $
   *
   * ====================================================================
   *
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 2002 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/>.
   * 
   * $Id: ParseTag.java,v 1.1 2003/03/06 11:50:41 jstrachan Exp $
   */
  package org.apache.commons.jelly.tags.core;
  
  import java.io.StringReader;
  
  import javax.xml.parsers.ParserConfigurationException;
  import javax.xml.parsers.SAXParser;
  import javax.xml.parsers.SAXParserFactory;
  
  import org.apache.commons.jelly.JellyTagException;
  import org.apache.commons.jelly.MissingAttributeException;
  import org.apache.commons.jelly.Script;
  import org.apache.commons.jelly.TagSupport;
  import org.apache.commons.jelly.XMLOutput;
  import org.apache.commons.jelly.parser.XMLParser;
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.xml.sax.ContentHandler;
  import org.xml.sax.InputSource;
  import org.xml.sax.SAXException;
  import org.xml.sax.XMLReader;
  
  /** 
   * Parses the output of this tags body or of a given String as a Jelly script
   * then either outputting the Script as a variable or executing the script.
   *
   * @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
   * @version $Revision: 1.1 $
   */
  public class ParseTag extends TagSupport {
  
      /** The Log to which logging calls will be made. */
      private static final Log log = LogFactory.getLog(ParseTag.class);
  
      /** The variable that will be generated for the document */
      private String var;
      
      /** The markup text to be parsed */
      private String text;
  
      /** The XMLReader used to parser the document */
      private XMLReader xmlReader;
  
  	/** The Jelly parser */
  	private XMLParser jellyParser;
  	
      public ParseTag() {
      }
  
      // Tag interface
      //-------------------------------------------------------------------------        
       
  
      /* (non-Javadoc)
       * @see org.apache.commons.jelly.Tag#doTag(org.apache.commons.jelly.XMLOutput)
       */
      public void doTag(XMLOutput output)
          throws MissingAttributeException, JellyTagException {
  
          String text = getText();
          if (text != null) {
              parseText(text);
          }
          else {            
              parseBody(output);
          }
  	
          Script script = getJellyParser().getScript();
          if (var != null) {
              context.setVariable(var, script);
          }
          else {
              // invoke the script
              script.run(context, output);
          }
      }
  
      // Properties
      //-------------------------------------------------------------------------        
       
      /** The variable name that will be used for the Document variable created
       */
      public String getVar() {
          return var;
      }
  
      /** Sets the variable name that will be used for the Document variable created
       */
      public void setVar(String var) {
          this.var = var;
      }
  
      /**
       * Returns the text to be parsed
       * @return String
       */
      public String getText() {
          return text;
      }
  
      /**
       * Sets the text to be parsed by this parser
       * @param text The text to be parsed by this parser
       */
      public void setText(String text) {
          this.text = text;
      }
  
      
      /** @return the XMLReader used for parsing, creating one lazily if need be  */
      public XMLReader getXMLReader() throws ParserConfigurationException, SAXException {
          if (xmlReader == null) {
              xmlReader = createXMLReader();
          }
          return xmlReader;
      }
  
      /** Sets the XMLReader used for parsing */
      public void setXMLReader(XMLReader xmlReader) {
          this.xmlReader = xmlReader;
      }
  
  
      /**
       * @return XMLParser
       */
      public XMLParser getJellyParser() {
          if (jellyParser == null) {
              jellyParser = createJellyParser();
          }
  	    return jellyParser;
      }
  
      /**
       * Sets the jellyParser.
       * @param jellyParser The jellyParser to set
       */
      public void setJellyParser(XMLParser jellyParser) {
          this.jellyParser = jellyParser;
      }
      
  
      // Implementation methods
      //-------------------------------------------------------------------------        
       
  
      /**
       * Factory method to create a new XMLReader
       */    
      protected XMLReader createXMLReader() throws ParserConfigurationException, SAXException
{
          SAXParserFactory factory = SAXParserFactory.newInstance();
          factory.setNamespaceAware(true);
          SAXParser parser = factory.newSAXParser();
          return parser.getXMLReader(); 
      }
      
      
      /**
       * Parses the body of this tag and returns the parsed document
       */
      protected void parseBody(XMLOutput output) throws JellyTagException {
          ContentHandler handler = getJellyParser();
          XMLOutput newOutput = new XMLOutput();
          
          try {
              handler.startDocument();
              invokeBody(newOutput);
              handler.endDocument();
          } 
          catch (SAXException e) {
              throw new JellyTagException(e);
          }
      }
      
      /**
       * Parses the give piece of text as being markup
       */
      protected void parseText(String text) throws JellyTagException {
          if ( log.isDebugEnabled() ) {
              log.debug( "About to parse: " + text );
          }
          
          try {
              getXMLReader().parse( new InputSource( new StringReader( text ) ) );
          } 
          catch (Exception e) {
              throw new JellyTagException(e);
          }
      }
      
      /**
       * Factory method to create a new Jelly parser
       * @return XMLParser
       */
      protected XMLParser createJellyParser() {
          XMLParser answer = new XMLParser();
          answer.setContext(context); 
          return answer;
      }
  }
  
  
  

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