Coverage report

  %line %branch
org.apache.commons.jexl.parser.ASTSizeFunction
81% 
87% 

 1  
 /*
 2  
  * Copyright 2002-2004 The Apache Software Foundation.
 3  
  * 
 4  
  * Licensed under the Apache License, Version 2.0 (the "License");
 5  
  * you may not use this file except in compliance with the License.
 6  
  * You may obtain a copy of the License at
 7  
  * 
 8  
  *      http://www.apache.org/licenses/LICENSE-2.0
 9  
  * 
 10  
  * Unless required by applicable law or agreed to in writing, software
 11  
  * distributed under the License is distributed on an "AS IS" BASIS,
 12  
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 13  
  * See the License for the specific language governing permissions and
 14  
  * limitations under the License.
 15  
  */
 16  
 package org.apache.commons.jexl.parser;
 17  
 
 18  
 import org.apache.commons.jexl.JexlContext;
 19  
 import org.apache.commons.jexl.util.Introspector;
 20  
 import org.apache.commons.jexl.util.introspection.Info;
 21  
 import org.apache.commons.jexl.util.introspection.VelMethod;
 22  
 
 23  
 import java.util.List;
 24  
 import java.util.Map;
 25  
 import java.util.Set;
 26  
 import java.lang.reflect.Array;
 27  
 
 28  
 /**
 29  
  *  generalized size() function for all classes we can think of
 30  
  *
 31  
  *  @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a>
 32  
  *  @author <a href="hw@kremvax.net">Mark H. Wilkinson</a>
 33  
  *  @version $Id: ASTSizeFunction.java,v 1.6 2004/08/15 16:01:12 dion Exp $
 34  
  */
 35  
 public class ASTSizeFunction extends SimpleNode
 36  
 {
 37  
     public ASTSizeFunction(int id)
 38  
     {
 39  0
         super(id);
 40  0
     }
 41  
 
 42  
     public ASTSizeFunction(Parser p, int id)
 43  
     {
 44  186
         super(p, id);
 45  186
     }
 46  
 
 47  
 
 48  
     /** Accept the visitor. **/
 49  
     public Object jjtAccept(ParserVisitor visitor, Object data)
 50  
     {
 51  0
         return visitor.visit(this, data);
 52  
     }
 53  
 
 54  
 
 55  
     public Object value(JexlContext jc)
 56  
         throws Exception
 57  
     {
 58  186
         SimpleNode arg = (SimpleNode) jjtGetChild(0);
 59  
 
 60  186
         Object val = arg.value(jc);
 61  
 
 62  186
         if (val == null)
 63  
         {
 64  0
             throw new Exception("size() : null arg");
 65  
         }
 66  
         
 67  186
         return new Integer(ASTSizeFunction.sizeOf(val));
 68  
     }
 69  
     
 70  
     public static int sizeOf(Object val)
 71  
         throws Exception
 72  
     {
 73  291
         if (val instanceof List)
 74  
         {
 75  105
             return ((List)val).size();
 76  
         }
 77  186
         else if (val.getClass().isArray())
 78  
         {
 79  15
             return Array.getLength(val);
 80  
         }
 81  171
         else if (val instanceof Map)
 82  
         {
 83  30
             return ((Map)val).size();
 84  
         }
 85  141
         else if (val instanceof String)
 86  
         {
 87  81
             return ((String)val).length();
 88  
         }
 89  60
         else if (val instanceof Set)
 90  
         {
 91  30
             return ((Set)val).size();
 92  
         }
 93  
         else {
 94  
         	// check if there is a size method on the object that returns an integer
 95  
         	// and if so, just use it
 96  30
         	Object[] params = new Object[0];
 97  30
         	Info velInfo = new Info("",1,1);
 98  30
             VelMethod vm = Introspector.getUberspect().getMethod(val, "size", params, velInfo);
 99  30
             if (vm != null && vm.getReturnType() == Integer.TYPE)
 100  
             {
 101  30
             	Integer result = (Integer)vm.invoke(val, params);
 102  30
             	return result.intValue();
 103  
             }
 104  
             else
 105  
             {
 106  0
                 throw new Exception("size() : unknown type : " + val.getClass());
 107  
             }
 108  
         }
 109  
     }
 110  
 
 111  
 }

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