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 java.util.Map;
import org.apache.velocity.exception.VelocityException;
import org.apache.velocity.runtime.log.Log;
/**
* GetExecutor that is smart about Maps. If it detects one, it does not
* use Reflection but a cast to access the getter.
*
* @author <a href="mailto:henning@apache.org">Henning P. Schmiedehausen</a>
* @version $Id: MapGetExecutor.java 799457 2009-07-30 22:10:27Z nbubna $
* @since 1.5
*/
public class MapGetExecutor
extends AbstractExecutor
{
private final String property;
public MapGetExecutor(final Log log, final Class clazz, final String property)
{
this.log = log;
this.property = property;
discover(clazz);
}
protected void discover (final Class clazz)
{
if (property != null && Map.class.isAssignableFrom(clazz))
{
try
{
setMethod(Map.class.getMethod("get", new Class [] { Object.class }));
}
/**
* pass through application level runtime exceptions
*/
catch( RuntimeException e )
{
throw e;
}
catch(Exception e)
{
String msg = "Exception while looking for get('" + property + "') method";
log.error(msg, e);
throw new VelocityException(msg, e);
}
}
}
public Object execute(final Object o)
{
return ((Map) o).get(property);
}
}