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| org.apache.commons.jexl.parser.ASTSizeFunction | 
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| 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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