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;
  
  import java.util.List;
  
  /**
   * Function call expression that evaluates to a boolean value.  Selector parsing requires BooleanExpression objects for
   * Boolean expressions, such as operands to AND, and as the final result of a selector.  This provides that interface
   * for function call expressions that resolve to Boolean values.
   * <p/>
   * If a function can return different types at evaluation-time, the function implementation needs to decide whether it
   * supports casting to Boolean at parse-time.
   *
   * @see    FunctionCallExpression#createFunctionCall
   */
  
  public class BooleanFunctionCallExpr extends FunctionCallExpression implements BooleanExpression {
      /**
       * Constructs a function call expression with the named filter function and arguments, which returns a boolean
       * result.
       *
       * @param    func_name - Name of the filter function to be called when evaluated.
       * @param    args - List of argument expressions passed to the function.
       */
  
      public BooleanFunctionCallExpr(String func_name, List<Expression> args)
              throws invalidFunctionExpressionException {
          super(func_name, args);
      }
  
  
      /**
       * Evaluate the function call expression, in the given context, and return an indication of whether the
       * expression "matches" (i.e.&nbsp;evaluates to true).
       *
       * @param    message_ctx - message context against which the expression will be evaluated.
       * @return the boolean evaluation of the function call expression.
       */
  
      public boolean matches(MessageEvaluationContext message_ctx) throws jakarta.jms.JMSException {
          Boolean result;
  
          result = (Boolean) evaluate(message_ctx);
  
          if (result != null)
              return result;
  
          return false;
      }
  }
  
  