costin 00/11/02 13:12:02
Added: src/share/org/apache/tomcat/util IntrospectionUtils.java
Log:
Various utilities using introspection to do tricks.
hasHook is used to determine if a class "overrides" a method in a parent
class.
Other common ( high level ) introspection helpers can be added.
Revision Changes Path
1.1
jakarta-tomcat/src/share/org/apache/tomcat/util/IntrospectionUtils.java
Index: IntrospectionUtils.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 [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/>.
*
* [Additional notices, if required by prior licensing conditions]
*
*/
package org.apache.tomcat.util;
import java.lang.reflect.*;
/**
* Utils for introspection and reflection
*/
public final class IntrospectionUtils {
/** Test if the interceptor implements a particular
* method
*/
public static boolean hasHook( Object obj, String methodN ) {
try {
Method myMethods[]=obj.getClass().getMethods();
for( int i=0; i< myMethods.length; i++ ) {
if( methodN.equals ( myMethods[i].getName() )) {
// check if it's overriden
Class declaring=myMethods[i].getDeclaringClass();
Class parentOfDeclaring=declaring.getSuperclass();
// this works only if the base class doesn't extend
// another class.
// if the method is declared in a top level class
// like BaseInterceptor parent is Object, otherwise
// parent is BaseInterceptor or an intermediate class
if( ! "java.jang.Object".
equals(parentOfDeclaring.getName() )) {
return true;
}
}
}
} catch ( Exception ex ) {
ex.printStackTrace();
}
return false;
}
}
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