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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;
/**
* <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 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 <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 + ":") && 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 <sql:param> is nested inside <sql:query> or
* <sql:update>. Note that <sql:param> does not need to
* be a direct child of <sql:query> or <sql:update>.
* Otherwise, the following would not work:
*
* <sql:query sql="..." var="...">
* <c:forEach var="arg" items="...">
* <sql:param value="${arg}"/>
* </c:forEach>
* </sql:query>
*/
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 <query>, record relevant state
if (isSqlTag(ns, ln, QUERY)) {
queryDepths.push(Integer.valueOf(depth));
}
// If we're in a <update>, record relevant state
if (isSqlTag(ns, ln, UPDATE)) {
updateDepths.push(Integer.valueOf(depth));
}
// If we're in a <transaction>, record relevant state
if (isSqlTag(ns, ln, TRANSACTION)) {
transactionDepths.push(Integer.valueOf(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 <query>-related state
if (isSqlTag(ns, ln, QUERY)) {
queryDepths.pop();
}
// update <update>-related state
if (isSqlTag(ns, ln, UPDATE)) {
updateDepths.pop();
}
// update <update>-related state
if (isSqlTag(ns, ln, TRANSACTION)) {
transactionDepths.pop();
}
// update our depth
depth--;
}
}
}
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