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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 2001
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
package org.ietf.ldap;
import java.lang.reflect.*;
import java.util.Hashtable;
/**
* Utility class to dynamically find methods of a class and to invoke
* them
*/
class DynamicInvoker {
static Object invokeMethod( Object obj,
String packageName,
String methodName,
Object[] args,
String[] argNames )
throws LDAPException {
try {
java.lang.reflect.Method m = getMethod( packageName,
methodName,
argNames );
if ( m != null ) {
return m.invoke( obj, args );
} else {
System.err.println( "No such method: " +
packageName + "." + methodName );
}
} catch ( Exception e ) {
e.printStackTrace();
throw new LDAPException( "Invoking " + methodName + ": " +
e.toString(),
LDAPException.PARAM_ERROR );
}
return null;
}
static Method getMethod( String packageName,
String methodName,
String[] args ) throws LDAPException {
try {
Method method = null;
String suffix = "";
if ( args != null ) {
for ( int i = 0; i < args.length; i++ ) {
suffix = suffix + args[i].getClass().getName();
}
}
String key = packageName + "." + methodName + "." + suffix;
if ( (method = (Method)(m_methodLookup.get(key))) != null ) {
return method;
}
Class c = Class.forName( packageName );
Method[] m = c.getMethods();
for ( int i = 0; i < m.length; i++ ) {
Class[] params = m[i].getParameterTypes();
if ( m[i].getName().equals(methodName) &&
signatureCorrect( params, args ) ) {
m_methodLookup.put( key, m[i] );
return m[i];
}
}
throw new LDAPException( "Method " +
methodName +
" not found in " +
packageName );
} catch ( ClassNotFoundException e ) {
throw new LDAPException( "Class " + packageName + " not found" );
}
}
static private boolean signatureCorrect( Class params[],
String args[] ) {
if ( args == null ) {
return true;
}
if ( params.length != args.length ) {
System.err.println( params.length + " method parameters vs " +
args.length + " expected" );
return false;
}
for ( int i = 0; i < params.length; i++ ) {
if ( !params[i].getName().equals(args[i]) ) {
System.err.println( params[i].getName() +
" method parameter vs " +
args[i] + " expected" );
return false;
}
}
return true;
}
private static Hashtable m_methodLookup = new Hashtable();
}
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