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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 | * @author <a href="geirm@apache.org">Geir Magnusson Jr.</a> |
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31 | * @version $Id: BooleanPropertyExecutor.java,v 1.4 2004/02/28 13:45:21 yoavs Exp $ |
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32 | */ |
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33 | public class BooleanPropertyExecutor extends PropertyExecutor |
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34 | { |
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35 | public BooleanPropertyExecutor(Log rlog, org.apache.commons.jexl.util.introspection.Introspector is, Class clazz, String property) |
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36 | { |
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37 | 18 | super(rlog, is, clazz, property); |
38 | 18 | } |
39 | ||
40 | protected void discover(Class clazz, String property) |
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41 | { |
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42 | try |
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43 | { |
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44 | char c; |
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45 | StringBuffer sb; |
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46 | ||
47 | 18 | Object[] params = { }; |
48 | ||
49 | /* |
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50 | * now look for a boolean isFoo |
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51 | */ |
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52 | ||
53 | 18 | sb = new StringBuffer("is"); |
54 | 18 | sb.append(property); |
55 | ||
56 | 18 | c = sb.charAt(2); |
57 | ||
58 | 18 | if (Character.isLowerCase(c)) |
59 | { |
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60 | 18 | sb.setCharAt(2, Character.toUpperCase(c)); |
61 | } |
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62 | ||
63 | 18 | methodUsed = sb.toString(); |
64 | 18 | method = introspector.getMethod(clazz, methodUsed, params); |
65 | ||
66 | 18 | if (method != null) |
67 | { |
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68 | /* |
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69 | * now, this has to return a boolean |
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70 | */ |
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71 | ||
72 | 18 | if (method.getReturnType() == Boolean.TYPE) |
73 | 18 | return; |
74 | ||
75 | 0 | method = null; |
76 | } |
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77 | 0 | } |
78 | catch(Exception e) |
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79 | { |
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80 | 0 | rlog.error("PROGRAMMER ERROR : BooleanPropertyExector() : " + e); |
81 | } |
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82 | 0 | } |
83 | } |
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