/*
* Copyright 2014 the original author or authors.
*
* Licensed 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.
*/
package org.springframework.data.hadoop.store.expression;
import java.text.SimpleDateFormat;
import java.util.Map;
import org.springframework.expression.AccessException;
import org.springframework.expression.EvaluationContext;
import org.springframework.expression.MethodExecutor;
import org.springframework.expression.TypedValue;
import org.springframework.messaging.Message;
/**
* A {@link MethodExecutor} handling formatting using a {@link SimpleDateFormat}.
*
* @author Janne Valkealahti
* @author Rodrigo Meneses
*
*/
public class MessageDateFormatMethodExecutor extends DateFormatMethodExecutor {
/**
* Instantiates a new message date format method executor.
*/
public MessageDateFormatMethodExecutor() {
super();
}
/**
* Instantiates a new message date format method executor.
*
* @param key the key for timestamp
*/
public MessageDateFormatMethodExecutor(String key) {
super(key);
}
@Override
public TypedValue execute(EvaluationContext context, Object target, Object... arguments) throws AccessException {
if (getKey() == null) {
return super.execute(context, target, arguments);
}
if (target instanceof Message<?>) {
Map<?, ?> map = ((Message<?>)target).getHeaders();
SimpleDateFormat format = new SimpleDateFormat((String)arguments[0]);
return new TypedValue(format.format(map.get(getKey())));
}
throw new AccessException("Unable to format");
}
}