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org.apache.commons.jexl.util.BooleanPropertyExecutor |
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1 | /* |
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2 | * Copyright 2000-2001,2004 The Apache Software Foundation. |
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3 | * |
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4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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5 | * you may not use this file except in compliance with the License. |
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6 | * You may obtain a copy of the License at |
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7 | * |
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8 | * http://www.apache.org/licenses/LICENSE-2.0 |
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9 | * |
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10 | * Unless required by applicable law or agreed to in writing, software |
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11 | * distributed under the License is distributed on an "AS IS" BASIS, |
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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13 | * See the License for the specific language governing permissions and |
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14 | * limitations under the License. |
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15 | */ |
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16 | ||
17 | package org.apache.commons.jexl.util; |
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18 | ||
19 | import org.apache.commons.logging.Log; |
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20 | /** |
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21 | * Handles discovery and valuation of a |
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22 | * boolean object property, of the |
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23 | * form public boolean is<Property> when executed. |
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24 | * |
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25 | * We do this separately as to preserve the current |
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26 | * quasi-broken semantics of get <as is property> |
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27 | * get<flip 1st char> get("property") and now followed |
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28 | * by is<Property>. |
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29 | * |
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30 | * @since 1.0 |
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31 | * @author <a href="geirm@apache.org">Geir Magnusson Jr.</a> |
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32 | * @version $Id: BooleanPropertyExecutor.java 398171 2006-04-29 14:57:29Z dion $ |
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33 | */ |
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34 | public class BooleanPropertyExecutor extends PropertyExecutor { |
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35 | ||
36 | /** |
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37 | * Constructor. |
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38 | * |
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39 | * @param rlog The instance log. |
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40 | * @param is The JEXL introspector. |
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41 | * @param clazz The class being analyzed. |
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42 | * @param property The boolean property. |
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43 | */ |
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44 | public BooleanPropertyExecutor(Log rlog, |
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45 | org.apache.commons.jexl.util.introspection.Introspector is, |
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46 | Class clazz, String property) { |
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47 | 3 | super(rlog, is, clazz, property); |
48 | 3 | } |
49 | ||
50 | /** |
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51 | * Locate the getter method for this boolean property. |
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52 | * |
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53 | * @param clazz The class being analyzed. |
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54 | * @param property Name of boolean property. |
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55 | */ |
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56 | protected void discover(Class clazz, String property) { |
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57 | try { |
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58 | char c; |
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59 | StringBuffer sb; |
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60 | ||
61 | 3 | Object[] params = {}; |
62 | ||
63 | /* |
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64 | * now look for a boolean isFoo |
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65 | */ |
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66 | ||
67 | 3 | sb = new StringBuffer("is"); |
68 | 3 | sb.append(property); |
69 | ||
70 | 3 | c = sb.charAt(2); |
71 | ||
72 | 3 | if (Character.isLowerCase(c)) { |
73 | 3 | sb.setCharAt(2, Character.toUpperCase(c)); |
74 | } |
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75 | ||
76 | 3 | methodUsed = sb.toString(); |
77 | 3 | method = introspector.getMethod(clazz, methodUsed, params); |
78 | ||
79 | 3 | if (method != null) { |
80 | /* |
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81 | * now, this has to return a boolean |
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82 | */ |
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83 | ||
84 | 2 | if (method.getReturnType() == Boolean.TYPE) { |
85 | 2 | return; |
86 | } |
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87 | ||
88 | 0 | method = null; |
89 | } |
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90 | 1 | } catch (Exception e) { |
91 | 0 | rlog.error("PROGRAMMER ERROR : BooleanPropertyExector() : " + e); |
92 | } |
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93 | 1 | } |
94 | } |
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