content: /**
   * 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:
   * <p/>
   * <p style="margin-left: 4em">
   * MAKELIST( '1', '2', '3' )
   * </p>
   */
  
  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 - 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 jakarta.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;
      }
  }
  