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    1   /*
    2    * Licensed to the Apache Software Foundation (ASF) under one or more
    3    * contributor license agreements.  See the NOTICE file distributed with
    4    * this work for additional information regarding copyright ownership.
    5    * The ASF licenses this file to You under the Apache License, Version 2.0
    6    * (the "License"); you may not use this file except in compliance with
    7    * the License.  You may obtain a copy of the License at
    8    *
    9    *   http://www.apache.org/licenses/LICENSE-2.0
   10    *
   11    * Unless required by applicable law or agreed to in writing, software
   12    * distributed under the License is distributed on an "AS IS" BASIS,
   13    * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   14    * See the License for the specific language governing permissions and
   15    * limitations under the License.
   16    *
   17    */
   18   
   19   package org.apache.jmeter.functions;
   20   
   21   // @see PackageTest for unit tests
   22   
   23   import java.util.Collection;
   24   import java.util.LinkedList;
   25   import java.util.List;
   26   
   27   import org.apache.jmeter.engine.util.CompoundVariable;
   28   import org.apache.jmeter.samplers.SampleResult;
   29   import org.apache.jmeter.samplers.Sampler;
   30   import org.apache.jmeter.util.JMeterUtils;
   31   
   32   /**
   33    * Function to evaluate a string which may contain variable or function references.
   34    *
   35    * Parameter: string to be evaluated
   36    *
   37    * Returns: the evaluated value
   38    *
   39    */
   40   public class EvalFunction extends AbstractFunction {
   41   
   42       private static final List desc = new LinkedList();
   43   
   44       private static final String KEY = "__eval"; //$NON-NLS-1$
   45   
   46       // Number of parameters expected - used to reject invalid calls
   47       private static final int MIN_PARAMETER_COUNT = 1;
   48       private static final int MAX_PARAMETER_COUNT = 1;
   49   
   50       static {
   51           desc.add(JMeterUtils.getResString("eval_name_param")); //$NON-NLS-1$
   52       }
   53   
   54       private Object[] values;
   55   
   56       public EvalFunction() {
   57       }
   58   
   59       public synchronized String execute(SampleResult previousResult, Sampler currentSampler)
   60               throws InvalidVariableException {
   61           String parameter = ((CompoundVariable) values[0]).execute();
   62           CompoundVariable cv = new CompoundVariable(parameter);
   63           return cv.execute();
   64       }
   65   
   66       public synchronized void setParameters(Collection parameters) throws InvalidVariableException {
   67           checkParameterCount(parameters, MIN_PARAMETER_COUNT, MAX_PARAMETER_COUNT);
   68           values = parameters.toArray();
   69       }
   70   
   71       public String getReferenceKey() {
   72           return KEY;
   73       }
   74   
   75       public List getArgumentDesc() {
   76           return desc;
   77       }
   78   
   79   }

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