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From sh...@apache.org
Subject cvs commit: jakarta-taglibs/standard/src/org/apache/taglibs/standard/tlv JstlSqlTLV.java
Date Tue, 02 Apr 2002 17:51:55 GMT
shawn       02/04/02 09:51:55

  Added:       standard/src/org/apache/taglibs/standard/tlv JstlSqlTLV.java
  Log:
  New SQL-library validator.  (Just a shell, currently, so that SQL-specific
  EL attributes can be validated.)
  
  Revision  Changes    Path
  1.1                  jakarta-taglibs/standard/src/org/apache/taglibs/standard/tlv/JstlSqlTLV.java
  
  Index: JstlSqlTLV.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.standard.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.standard.lang.support.ExpressionEvaluator;
  import org.apache.taglibs.standard.lang.support.ExpressionEvaluatorManager;
  import org.apache.taglibs.standard.resources.Resources;
  
  /**
   * <p>A SAX-based TagLibraryValidator for the JSTL SQL tag library.
   * 
   * @author Shawn Bayern
   */
  public class JstlSqlTLV extends JstlBaseTLV {
  
      //*********************************************************************
      // Constants
  
      // tag names
      private final String JSP_TEXT = "jsp:text";
  
  
      //*********************************************************************
      // 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 String lastElementName = null;
  	private boolean bodyNecessary = false;
  	private boolean bodyIllegal = false;
  
  	// process under the existing context (state), then modify it
  	public void startElement(
  	        String ns, String ln, String qn, Attributes a) {
  
  	    // substitute our own parsed 'ln' if it's not provided
  	    if (ln == null)
  		ln = getLocalPart(qn);
  
  	    // 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));
  
  	    // 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)) {
  			String vMsg =
  			    validateExpression(
  				ln,
  				attName,
  				a.getValue(i));
  			if (vMsg != null)
  			    fail(vMsg);
  		    }
  		}
  	    }
  
              // validate attributes
              if (qn.startsWith(prefix + ":") && !hasNoInvalidScope(a))
                  fail(Resources.getMessage("TLV_INVALID_ATTRIBUTE",
                      SCOPE, qn, a.getValue(SCOPE))); 
  	    if (qn.startsWith(prefix + ":") && hasDanglingScope(a))
  		fail(Resources.getMessage("TLV_DANGLING_SCOPE", qn));
  
  	    // now, modify state
  
  	    // set up a check against illegal attribute/body combinations
  	    bodyIllegal = false;
  	    bodyNecessary = false;
  
  	    // record the most recent tag (for error reporting)
  	    lastElementName = qn;
  	    lastElementId = a.getValue("http://java.sun.com/JSP/Page", "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!
  	}
  
  	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 our depth
  	    depth--;
  	}
      }
  }
  
  
  

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