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;
  
  /**
   * Function which splits a string into a list of strings given a regular expression for the separator.
   */
  
  public class splitFunction implements FilterFunction {
      /**
       * Check whether the given expression is valid for this function.
       *
       * @param    expr - the expression consisting of a call to this function.
       * @return true - if two or three arguments are passed to the function; false - otherwise.
       */
  
      public boolean isValid(FunctionCallExpression expr) {
          if ((expr.getNumArguments() >= 2) && (expr.getNumArguments() <= 3))
              return true;
  
          return false;
      }
  
  
      /**
       * Indicate that this function does not return a boolean value.
       *
       * @param    expr - the expression consisting of a call to this function.
       * @return false - indicating this filter function never evaluates to a boolean result.
       */
  
      public boolean returnsBoolean(FunctionCallExpression expr) {
          return false;
      }
  
  
      /**
       * Evaluate the given expression for this function in the given context.  A list of zero or more strings
       * results from the evaluation.  The result of the evaluation of the first argument is split with the regular
       * expression which results from the evaluation of the second argument.  If a third argument is given, it
       * is an integer which limits the split.  String#split() performs the split.
       * <p/>
       * The first two arguments must be Strings.  If a third is given, it must be an Integer.
       *
       * @param    expr - the expression consisting of a call to this function.
       * @return List - a list of Strings resulting from the split.
       */
  
      public Object evaluate(FunctionCallExpression expr, MessageEvaluationContext message_ctx)
              throws jakarta.jms.JMSException {
          String src;
          String split_pat;
          String[] result;
  
          src = (String) expr.getArgument(0).evaluate(message_ctx);
          split_pat = (String) expr.getArgument(1).evaluate(message_ctx);
  
          if (expr.getNumArguments() > 2) {
              Integer limit;
  
              limit = (Integer) expr.getArgument(2).evaluate(message_ctx);
  
              result = src.split(split_pat, limit);
          } else {
              result = src.split(split_pat);
          }
  
          return java.util.Arrays.asList(result);
      }
  }
  