org.apache.taglibs.standard.tlv.JstlSqlTLV Maven / Gradle / Ivy
/*
* The contents of this file are subject to the terms
* of the Common Development and Distribution License
* (the "License"). You may not use this file except
* in compliance with the License.
*
* You can obtain a copy of the license at
* glassfish/bootstrap/legal/CDDLv1.0.txt or
* https://glassfish.dev.java.net/public/CDDLv1.0.html.
* See the License for the specific language governing
* permissions and limitations under the License.
*
* When distributing Covered Code, include this CDDL
* HEADER in each file and include the License file at
* glassfish/bootstrap/legal/CDDLv1.0.txt. If applicable,
* add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your
* own identifying information: Portions Copyright [yyyy]
* [name of copyright owner]
*
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
*
* Portions Copyright Apache Software Foundation.
*/
package org.apache.taglibs.standard.tlv;
import java.util.Set;
import java.util.Stack;
import javax.servlet.jsp.tagext.PageData;
import javax.servlet.jsp.tagext.ValidationMessage;
import org.apache.taglibs.standard.resources.Resources;
import org.xml.sax.Attributes;
import org.xml.sax.helpers.DefaultHandler;
/**
* A SAX-based TagLibraryValidator for the JSTL SQL tag library.
*
* @author Shawn Bayern
*/
public class JstlSqlTLV extends JstlBaseTLV {
//*********************************************************************
// Constants
// tag names
private final String SETDATASOURCE = "setDataSource";
private final String QUERY = "query";
private final String UPDATE = "update";
private final String TRANSACTION = "transaction";
private final String PARAM = "param";
private final String DATEPARAM = "dateParam";
private final String JSP_TEXT = "jsp:text";
// attribute names
private final String SQL = "sql";
private final String DATASOURCE = "dataSource";
//*********************************************************************
// set its type and delegate validation to super-class
public ValidationMessage[] validate(
String prefix, String uri, PageData page) {
return super.validate( TYPE_SQL, prefix, uri, page );
}
//*********************************************************************
// 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 queryDepths = new Stack();
private Stack updateDepths = new Stack();
private Stack transactionDepths = new Stack();
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 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 + ":") && hasEmptyVar(a))
fail(Resources.getMessage("TLV_EMPTY_VAR", qn));
if (qn.startsWith(prefix + ":") && hasDanglingScope(a) &&
!qn.startsWith(prefix + ":" + SETDATASOURCE))
fail(Resources.getMessage("TLV_DANGLING_SCOPE", qn));
// now, modify state
/*
* Make sure is nested inside or
* . Note that does not need to
* be a direct child of or .
* Otherwise, the following would not work:
*
*
*
*
*
*/
if ( (isSqlTag(ns, ln, PARAM) || isSqlTag(ns, ln, DATEPARAM))
&& (queryDepths.empty() && updateDepths.empty()) ) {
fail(Resources.getMessage("SQL_PARAM_OUTSIDE_PARENT"));
}
// If we're in a , record relevant state
if (isSqlTag(ns, ln, QUERY)) {
queryDepths.push(new Integer(depth));
}
// If we're in a , record relevant state
if (isSqlTag(ns, ln, UPDATE)) {
updateDepths.push(new Integer(depth));
}
// If we're in a , record relevant state
if (isSqlTag(ns, ln, TRANSACTION)) {
transactionDepths.push(new Integer(depth));
}
// set up a check against illegal attribute/body combinations
bodyIllegal = false;
bodyNecessary = false;
if (isSqlTag(ns, ln, QUERY) || isSqlTag(ns, ln, UPDATE)) {
if (!hasAttribute(a, SQL)) {
bodyNecessary = true;
}
if (hasAttribute(a, DATASOURCE) && !transactionDepths.empty()) {
fail(Resources.getMessage("ERROR_NESTED_DATASOURCE"));
}
}
if (isSqlTag(ns, ln, DATEPARAM)) {
bodyIllegal = true;
}
// 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) {
bodyNecessary = false; // body is no longer necessary!
// 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));
}
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 -related state
if (isSqlTag(ns, ln, QUERY)) {
queryDepths.pop();
}
// update -related state
if (isSqlTag(ns, ln, UPDATE)) {
updateDepths.pop();
}
// update -related state
if (isSqlTag(ns, ln, TRANSACTION)) {
transactionDepths.pop();
}
// update our depth
depth--;
}
}
}