You are viewing a plain text version of this content. The canonical link for it is here.
Posted to taglibs-dev@jakarta.apache.org by sh...@apache.org on 2002/04/02 19:51:55 UTC
cvs commit: jakarta-taglibs/standard/src/org/apache/taglibs/standard/tlv JstlSqlTLV.java
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--;
}
}
}
--
To unsubscribe, e-mail: <ma...@jakarta.apache.org>
For additional commands, e-mail: <ma...@jakarta.apache.org>