kinman 2002/11/06 10:48:18
Added: jasper2/src/share/org/apache/jasper/runtime
ProtectedFunctionMapper.java
Log:
Revision Changes Path
1.1
jakarta-tomcat-jasper/jasper2/src/share/org/apache/jasper/runtime/ProtectedFunctionMapper.java
Index: ProtectedFunctionMapper.java
===================================================================
/*
* $Header:
/home/cvs/jakarta-tomcat-jasper/jasper2/src/share/org/apache/jasper/runtime/ProtectedFunctionMapper.java,v
1.1 2002/11/06 18:48:17 kinman Exp $
* $Revision: 1.1 $
* $Date: 2002/11/06 18:48:17 $
*
* ====================================================================
*
* 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 [EMAIL PROTECTED]
*
* 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.jasper.runtime;
import org.apache.jasper.logging.Logger;
import java.util.HashMap;
import java.security.AccessController;
import java.security.PrivilegedAction;
/**
* Maps EL functions to their Java method counterparts. Keeps the
* actual Method objects protected so that JSP pages can't indirectly
* do reflection.
*
* @author Mark Roth
* @author Kin-man Chung
*/
public final class ProtectedFunctionMapper {
/** For tracing of error messages */
private static Logger.Helper loghelper = new Logger.Helper("JASPER_LOG",
"ProtectedFunctionMapper");
/**
* Maps "prefix:name" to java.lang.Method objects. Lazily created.
*/
private HashMap fnmap = new java.util.HashMap();
/**
* Constructor has protected access.
*/
private ProtectedFunctionMapper() {
}
/**
* Generated Servlet and Tag Handler implementations call this
* method to retrieve an instance of the ProtectedFunctionMapper.
* This is necessary since generated code does not have access to
* create instances of classes in this package.
*
* @return A new protected function mapper.
*/
public static ProtectedFunctionMapper getInstance() {
if (System.getSecurityManager() != null) {
return (ProtectedFunctionMapper)AccessController.doPrivileged(
new PrivilegedAction() {
public Object run() {
return new ProtectedFunctionMapper();
}
} );
} else {
return new ProtectedFunctionMapper();
}
}
/**
* Stores a mapping from the given EL function prefix and name to
* the given Java method.
*
* @param prefix The EL function prefix
* @param fnName The EL function name
* @param c The class containing the Java method
* @param methodName The name of the Java method
* @param args The arguments of the Java method
* @throws RuntimeException if no method with the given signature
* could be found.
*/
public void mapFunction( String prefix, String fnName,
Class c, String methodName, Class[] args )
{
java.lang.reflect.Method method;
try {
method = c.getDeclaredMethod(methodName, args);
} catch( NoSuchMethodException e ) {
throw new RuntimeException(
"Invalid function mapping - no such method: " + e.getMessage());
}
this.fnmap.put( prefix + ":" + fnName, method );
}
/**
* Only the org.apache.jasper.runtime package can access the actual
* function map.
*
* @return A HashMap, with keys as "name:prefix" and values as
* the corresponding java.lang.Method instances.
*/
HashMap getFnMap() {
return this.fnmap;
}
}
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