Coverage report

  %line %branch
org.apache.commons.jexl.parser.ASTSizeFunction
80% 
97% 

 1  
 /*
 2  
  * Copyright 2002-2006 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 java.lang.reflect.Array;
 19  
 import java.util.Collection;
 20  
 import java.util.Map;
 21  
 
 22  
 import org.apache.commons.jexl.JexlContext;
 23  
 import org.apache.commons.jexl.util.Introspector;
 24  
 import org.apache.commons.jexl.util.introspection.Info;
 25  
 import org.apache.commons.jexl.util.introspection.VelMethod;
 26  
 
 27  
 /**
 28  
  * generalized size() function for all classes we can think of.
 29  
  * 
 30  
  * @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a>
 31  
  * @author <a href="hw@kremvax.net">Mark H. Wilkinson</a>
 32  
  * @version $Id: ASTSizeFunction.java 398324 2006-04-30 12:20:24Z dion $
 33  
  */
 34  
 public class ASTSizeFunction extends SimpleNode {
 35  
     /**
 36  
      * Create the node given an id.
 37  
      * 
 38  
      * @param id node id.
 39  
      */
 40  
     public ASTSizeFunction(int id) {
 41  0
         super(id);
 42  0
     }
 43  
 
 44  
     /**
 45  
      * Create a node with the given parser and id.
 46  
      * 
 47  
      * @param p a parser.
 48  
      * @param id node id.
 49  
      */
 50  
     public ASTSizeFunction(Parser p, int id) {
 51  13
         super(p, id);
 52  13
     }
 53  
 
 54  
     /** {@inheritDoc} */
 55  
     public Object jjtAccept(ParserVisitor visitor, Object data) {
 56  0
         return visitor.visit(this, data);
 57  
     }
 58  
 
 59  
     /** {@inheritDoc} */
 60  
     public Object value(JexlContext jc) throws Exception {
 61  13
         SimpleNode arg = (SimpleNode) jjtGetChild(0);
 62  
 
 63  13
         Object val = arg.value(jc);
 64  
 
 65  13
         if (val == null) {
 66  0
             throw new Exception("size() : null arg");
 67  
         }
 68  
 
 69  13
         return new Integer(ASTSizeFunction.sizeOf(val));
 70  
     }
 71  
 
 72  
     /**
 73  
      * Calculate the <code>size</code> of various types: Collection, Array, Map, String,
 74  
      * and anything that has a int size() method.
 75  
      * 
 76  
      * @param val the object to get the size of.
 77  
      * @return the size of val
 78  
      * @throws Exception if the size cannot be determined.
 79  
      */
 80  
     public static int sizeOf(Object val) throws Exception {
 81  20
         if (val instanceof Collection) {
 82  9
             return ((Collection) val).size();
 83  11
         } else if (val.getClass().isArray()) {
 84  1
             return Array.getLength(val);
 85  10
         } else if (val instanceof Map) {
 86  2
             return ((Map) val).size();
 87  8
         } else if (val instanceof String) {
 88  6
             return ((String) val).length();
 89  
         } else {
 90  
             // check if there is a size method on the object that returns an
 91  
             // integer
 92  
             // and if so, just use it
 93  2
             Object[] params = new Object[0];
 94  2
             Info velInfo = new Info("", 1, 1);
 95  2
             VelMethod vm = Introspector.getUberspect().getMethod(val, "size", params, velInfo);
 96  2
             if (vm != null && vm.getReturnType() == Integer.TYPE) {
 97  2
                 Integer result = (Integer) vm.invoke(val, params);
 98  2
                 return result.intValue();
 99  
             }
 100  0
             throw new Exception("size() : unknown type : " + val.getClass());
 101  
         }
 102  
     }
 103  
 
 104  
 }

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