package org.apache.velocity.runtime.parser.node;
/*
* The Apache Software License, Version 1.1
*
* Copyright (c) 2000-2001 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", "Velocity", 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 apache@apache.org.
*
* 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/>.
*/
import java.lang.reflect.Method;
import org.apache.velocity.context.InternalContextAdapter;
import org.apache.velocity.util.introspection.Introspector;
import java.lang.reflect.InvocationTargetException;
import org.apache.velocity.exception.MethodInvocationException;
import org.apache.velocity.runtime.RuntimeServices;
/**
* Executor that simply tries to execute a get(key)
* operation. This will try to find a get(key) method
* for any type of object, not just objects that
* implement the Map interface as was previously
* the case.
*
* @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a>
* @version $Id: GetExecutor.java,v 1.6 2001/10/22 03:53:25 jon Exp $
*/
public class GetExecutor extends AbstractExecutor
{
/**
* Container to hold the 'key' part of
* get(key).
*/
private Object[] args = new Object[1];
/**
* Default constructor.
*/
public GetExecutor( RuntimeServices r, Class c, String key)
throws Exception
{
rsvc = r;
args[0] = key;
method = rsvc.getIntrospector().getMethod(c, "get", args);
}
/**
* Execute method against context.
*/
public Object execute(Object o, InternalContextAdapter context)
throws IllegalAccessException, MethodInvocationException
{
if (method == null)
return null;
try
{
return method.invoke(o, args);
}
catch( InvocationTargetException ite )
{
/*
* the method we invoked threw an exception.
* package and pass it up
*/
throw new MethodInvocationException(
"Invocation of method 'get(\"" + args[0] + "\")'"
+ " in " + o.getClass()
+ " threw exception "
+ ite.getTargetException().getClass(),
ite.getTargetException(), "get" );
}
catch( IllegalArgumentException iae )
{
return null;
}
}
}