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| org.apache.commons.jexl.util.PropertyExecutor | 
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| 1 |  /* | |
| 2 |   * Copyright 2000-2002,2004 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.util; | |
| 17 | ||
| 18 |  import java.lang.reflect.InvocationTargetException; | |
| 19 | ||
| 20 |  import org.apache.commons.jexl.util.introspection.Introspector; | |
| 21 |  import org.apache.commons.logging.Log; | |
| 22 | ||
| 23 |  /** | |
| 24 |   * Returned the value of object property when executed. | |
| 25 |   * @since 1.0 | |
| 26 |   */ | |
| 27 | public class PropertyExecutor extends AbstractExecutor { | |
| 28 | ||
| 29 |      /** index of the first character of the property. */ | |
| 30 | private static final int PROPERTY_START_INDEX = 3; | |
| 31 |      /** The JEXL introspector used. */ | |
| 32 | 26 | protected Introspector introspector = null; | 
| 33 | ||
| 34 |      /** The method used. */ | |
| 35 | 26 | protected String methodUsed = null; | 
| 36 | ||
| 37 |      /** | |
| 38 |       * Constructor. | |
| 39 |       * | |
| 40 |       * @param r The log for this property executor instance. | |
| 41 |       * @param ispctr The JEXL introspector. | |
| 42 |       * @param clazz The class being examined. | |
| 43 |       * @param property The property being addressed. | |
| 44 |       */ | |
| 45 |      public PropertyExecutor(Log r, Introspector ispctr, | |
| 46 | 26 |              Class clazz, String property) { | 
| 47 | 26 | rlog = r; | 
| 48 | 26 | introspector = ispctr; | 
| 49 | ||
| 50 | 26 | discover(clazz, property); | 
| 51 | 26 | } | 
| 52 | ||
| 53 |      /** | |
| 54 |       * Locate the getter method for this property. | |
| 55 |       * | |
| 56 |       * @param clazz The class being analyzed. | |
| 57 |       * @param property Name of the property. | |
| 58 |       */ | |
| 59 | protected void discover(Class clazz, String property) { | |
| 60 |          /* | |
| 61 |           *  this is gross and linear, but it keeps it straightforward. | |
| 62 |           */ | |
| 63 | ||
| 64 |          try { | |
| 65 |              char c; | |
| 66 | StringBuffer sb; | |
| 67 | ||
| 68 | 23 |              Object[] params = {}; | 
| 69 | ||
| 70 |              /* | |
| 71 |               *  start with get<property> | |
| 72 |               *  this leaves the property name  | |
| 73 |               *  as is... | |
| 74 |               */ | |
| 75 | 23 | sb = new StringBuffer("get"); | 
| 76 | 23 | sb.append(property); | 
| 77 | ||
| 78 | 23 | methodUsed = sb.toString(); | 
| 79 | ||
| 80 | 23 | method = introspector.getMethod(clazz, methodUsed, params); | 
| 81 | ||
| 82 | 23 | if (method != null) { | 
| 83 | 0 |                  return; | 
| 84 | } | |
| 85 | ||
| 86 |              /* | |
| 87 |               *  now the convenience, flip the 1st character | |
| 88 |               */ | |
| 89 | ||
| 90 | 23 | sb = new StringBuffer("get"); | 
| 91 | 23 | sb.append(property); | 
| 92 | ||
| 93 | 23 | c = sb.charAt(PROPERTY_START_INDEX); | 
| 94 | ||
| 95 | 23 |              if (Character.isLowerCase(c)) { | 
| 96 | 23 | sb.setCharAt(PROPERTY_START_INDEX, Character.toUpperCase(c)); | 
| 97 |              } else { | |
| 98 | 0 |                  sb.setCharAt(PROPERTY_START_INDEX, Character.toLowerCase(c)); | 
| 99 | } | |
| 100 | ||
| 101 | 23 | methodUsed = sb.toString(); | 
| 102 | 23 | method = introspector.getMethod(clazz, methodUsed, params); | 
| 103 | ||
| 104 | 23 | if (method != null) { | 
| 105 | 20 |                  return; | 
| 106 | } | |
| 107 | ||
| 108 | 3 |          } catch (Exception e) { | 
| 109 | 0 |              rlog.error("PROGRAMMER ERROR : PropertyExector() : " + e); | 
| 110 | } | |
| 111 | 3 | } | 
| 112 | ||
| 113 | ||
| 114 |      /** | |
| 115 |       * {@inheritDoc} | |
| 116 |       */ | |
| 117 |      public Object execute(Object o) | |
| 118 |      throws IllegalAccessException,  InvocationTargetException { | |
| 119 | 22 | if (method == null) { | 
| 120 | 0 |              return null; | 
| 121 | } | |
| 122 | ||
| 123 | 22 | return method.invoke(o, null); | 
| 124 | } | |
| 125 | } | |
| 126 | 
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