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package org.apache.velocity.runtime.parser.node;
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
import org.apache.commons.lang3.StringUtils;
import org.apache.velocity.exception.VelocityException;
import org.apache.velocity.util.introspection.Introspector;
import org.slf4j.Logger;
import java.lang.reflect.InvocationTargetException;
/**
* Executor for looking up property names in the passed in class
* This will try to find a set<foo>(key, value) method
*
* @author <a href="mailto:henning@apache.org">Henning P. Schmiedehausen</a>
* @version $Id$
* @since 1.5
*/
public class SetPropertyExecutor
extends SetExecutor
{
private final Introspector introspector;
/**
* @param log
* @param introspector
* @param clazz
* @param property
* @param arg
*/
public SetPropertyExecutor(final Logger log, final Introspector introspector,
final Class<?> clazz, final String property, final Object arg)
{
this.log = log;
this.introspector = introspector;
// Don't allow passing in the empty string or null because
// it will either fail with a StringIndexOutOfBounds error
// or the introspector will get confused.
if (StringUtils.isNotEmpty(property))
{
discover(clazz, property, arg);
}
}
/**
* @return The current introspector.
*/
protected Introspector getIntrospector()
{
return this.introspector;
}
/**
* @param clazz
* @param property
* @param arg
*/
protected void discover(final Class<?> clazz, final String property, final Object arg)
{
Object [] params = new Object [] { arg };
try
{
StringBuilder sb = new StringBuilder("set");
sb.append(property);
setMethod(introspector.getMethod(clazz, sb.toString(), params));
if (!isAlive())
{
/*
* now the convenience, flip the 1st character
*/
char c = sb.charAt(3);
if (Character.isLowerCase(c))
{
sb.setCharAt(3, Character.toUpperCase(c));
}
else
{
sb.setCharAt(3, Character.toLowerCase(c));
}
setMethod(introspector.getMethod(clazz, sb.toString(), params));
}
}
/*
* pass through application level runtime exceptions
*/
catch( RuntimeException e )
{
throw e;
}
catch(Exception e)
{
String msg = "Exception while looking for property setter for '" + property;
log.error(msg, e);
throw new VelocityException(msg, e);
}
}
/**
* Execute method against context.
* @param o
* @param value
* @return The value of the invocation.
* @throws IllegalAccessException
* @throws InvocationTargetException
*/
@Override
public Object execute(final Object o, final Object value)
throws IllegalAccessException, InvocationTargetException
{
Object [] params = new Object [] { value };
return isAlive() ? getMethod().invoke(o, params) : null;
}
}
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