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 java.lang.reflect.InvocationTargetException;
import org.apache.velocity.util.introspection.Introspector;
import org.apache.velocity.exception.MethodInvocationException;
import org.apache.velocity.app.event.EventCartridge;
import org.apache.velocity.context.InternalContextAdapter;
import org.apache.velocity.runtime.RuntimeServices;
import org.apache.velocity.util.introspection.Introspector;
/**
* Returned the value of object property when executed.
*/
public class PropertyExecutor extends AbstractExecutor
{
protected String methodUsed = null;
public PropertyExecutor( RuntimeServices r, Class clazz, String property)
{
rsvc = r;
discover( clazz, property );
}
protected void discover( Class clazz, String property )
{
/*
* this is gross and linear, but it keeps it straightforward.
*/
try
{
char c;
StringBuffer sb;
Object[] params = { };
Introspector introspector = rsvc.getIntrospector();
/*
* start with get<property>
* this leaves the property name
* as is...
*/
sb = new StringBuffer( "get" );
sb.append( property );
methodUsed = sb.toString();
method = introspector.getMethod( clazz, methodUsed, params);
if (method != null)
return;
/*
* now the convenience, flip the 1st character
*/
sb = new StringBuffer( "get" );
sb.append( property );
c = sb.charAt(3);
if( Character.isLowerCase( c ) )
{
sb.setCharAt( 3 , Character.toUpperCase( c ) );
}
else
{
sb.setCharAt( 3 , Character.toLowerCase( c ) );
}
methodUsed = sb.toString();
method = introspector.getMethod( clazz, methodUsed, params);
if ( method != null)
return;
}
catch( Exception e )
{
rsvc.error("PROGRAMMER ERROR : PropertyExector() : " + e );
}
}
/**
* Execute method against context.
*/
public Object execute(Object o, InternalContextAdapter context)
throws IllegalAccessException, MethodInvocationException
{
if (method == null)
return null;
try
{
return method.invoke(o, null);
}
catch( InvocationTargetException ite )
{
EventCartridge ec = context.getEventCartridge();
/*
* if we have an event cartridge, see if it wants to veto
* also, let non-Exception Throwables go...
*/
if ( ec != null && ite.getTargetException() instanceof java.lang.Exception)
{
try
{
return ec.methodException( o.getClass(), methodUsed, (Exception)ite.getTargetException() );
}
catch( Exception e )
{
throw new MethodInvocationException(
"Invocation of method '" + methodUsed + "'"
+ " in " + o.getClass()
+ " threw exception "
+ ite.getTargetException().getClass() + " : "
+ ite.getTargetException().getMessage(),
ite.getTargetException(), methodUsed );
}
}
else
{
/*
* no event cartridge to override. Just throw
*/
throw new MethodInvocationException(
"Invocation of method '" + methodUsed + "'"
+ " in " + o.getClass()
+ " threw exception "
+ ite.getTargetException().getClass() + " : "
+ ite.getTargetException().getMessage(),
ite.getTargetException(), methodUsed );
}
}
catch( IllegalArgumentException iae )
{
return null;
}
}
}