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/**
* 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.
*/
package org.apache.activemq.filter.function;
import org.apache.activemq.filter.FunctionCallExpression;
import org.apache.activemq.filter.MessageEvaluationContext;
/**
* Filter function that creates a list with each argument being one element in the list.
* For example:
*
*
* MAKELIST( '1', '2', '3' )
*
*/
public class makeListFunction implements FilterFunction {
/**
* Check whether the given expression is a valid call of this function. Any number of arguments is accepted.
*
* @param expr - the expression consisting of a call to this function.
* @return true - if the expression is valid; false - otherwise.
*/
public boolean isValid(FunctionCallExpression expr) {
return true;
}
/**
* Indicate that this function never evaluates to a Boolean result.
*
* @param expr - the expression consisting of a call to this function.
* @return false - this Filter Function never evaluates to a Boolean.
*/
public boolean returnsBoolean(FunctionCallExpression expr) {
return false;
}
/**
* Evalutate the given expression, which consists of a call to this function, in the context given. Creates
* a list containing the evaluated results of its argument expressions.
*
* @param expr - the expression consisting of a call to this function.
* @param message_ctx - the context in which the call is being evaluated.
* @return java.util.List - the result of the evaluation.
*/
public Object evaluate(FunctionCallExpression expr, MessageEvaluationContext message)
throws javax.jms.JMSException {
java.util.ArrayList ele_arr;
int num_arg;
int cur;
num_arg = expr.getNumArguments();
ele_arr = new java.util.ArrayList(num_arg);
cur = 0;
while (cur < num_arg) {
ele_arr.add(expr.getArgument(cur).evaluate(message));
cur++;
}
return (java.util.List) ele_arr;
}
}