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org.apache.commons.jexl.util.introspection.Introspector |
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1 | /* |
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2 | * Copyright 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.introspection; |
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18 | ||
19 | import java.lang.reflect.Method; |
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20 | ||
21 | import org.apache.commons.logging.Log; |
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22 | ||
23 | ||
24 | /** |
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25 | * This basic function of this class is to return a Method |
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26 | * object for a particular class given the name of a method |
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27 | * and the parameters to the method in the form of an Object[] |
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28 | * |
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29 | * The first time the Introspector sees a |
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30 | * class it creates a class method map for the |
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31 | * class in question. Basically the class method map |
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32 | * is a Hastable where Method objects are keyed by a |
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33 | * concatenation of the method name and the names of |
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34 | * classes that make up the parameters. |
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35 | * |
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36 | * For example, a method with the following signature: |
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37 | * |
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38 | * public void method(String a, StringBuffer b) |
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39 | * |
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40 | * would be mapped by the key: |
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41 | * |
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42 | * "method" + "java.lang.String" + "java.lang.StringBuffer" |
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43 | * |
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44 | * This mapping is performed for all the methods in a class |
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45 | * and stored for |
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46 | * @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a> |
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47 | * @author <a href="mailto:bob@werken.com">Bob McWhirter</a> |
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48 | * @author <a href="mailto:szegedia@freemail.hu">Attila Szegedi</a> |
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49 | * @author <a href="mailto:paulo.gaspar@krankikom.de">Paulo Gaspar</a> |
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50 | * @version $Id: Introspector.java,v 1.6 2004/08/23 13:50:00 dion Exp $ |
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51 | */ |
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52 | public class Introspector extends IntrospectorBase |
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53 | { |
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54 | /** |
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55 | * define a public string so that it can be looked for |
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56 | * if interested |
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57 | */ |
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58 | ||
59 | public static final String CACHEDUMP_MSG = |
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60 | "Introspector : detected classloader change. Dumping cache."; |
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61 | ||
62 | /** |
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63 | * our engine runtime services |
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64 | */ |
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65 | 30 | private Log rlog = null; |
66 | ||
67 | /** |
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68 | * Recieves our RuntimeServices object |
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69 | */ |
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70 | 2 | public Introspector(Log logger) |
71 | 28 | { |
72 | 30 | this.rlog = logger; |
73 | 30 | } |
74 | ||
75 | /** |
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76 | * Gets the method defined by <code>name</code> and |
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77 | * <code>params</code> for the Class <code>c</code>. |
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78 | * |
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79 | * @param c Class in which the method search is taking place |
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80 | * @param name Name of the method being searched for |
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81 | * @param params An array of Objects (not Classes) that describe the |
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82 | * the parameters |
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83 | * |
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84 | * @return The desired Method object. |
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85 | */ |
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86 | public Method getMethod(Class c, String name, Object[] params) |
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87 | throws Exception |
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88 | { |
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89 | /* |
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90 | * just delegate to the base class |
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91 | */ |
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92 | ||
93 | try |
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94 | { |
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95 | 1131 | return super.getMethod( c, name, params ); |
96 | } |
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97 | catch( MethodMap.AmbiguousException ae ) |
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98 | { |
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99 | /* |
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100 | * whoops. Ambiguous. Make a nice log message and return null... |
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101 | */ |
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102 | ||
103 | 0 | String msg = "Introspection Error : Ambiguous method invocation " |
104 | + name + "( "; |
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105 | ||
106 | 0 | for (int i = 0; i < params.length; i++) |
107 | { |
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108 | 0 | if ( i > 0) |
109 | 0 | msg += ", "; |
110 | ||
111 | 0 | msg += params[i].getClass().getName(); |
112 | } |
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113 | ||
114 | 0 | msg = msg + ") for class " + c; |
115 | ||
116 | 0 | rlog.error( msg ); |
117 | } |
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118 | ||
119 | 0 | return null; |
120 | } |
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121 | ||
122 | /** |
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123 | * Clears the classmap and classname |
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124 | * caches, and logs that we did so |
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125 | */ |
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126 | protected void clearCache() |
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127 | { |
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128 | 0 | super.clearCache(); |
129 | 0 | rlog.info( CACHEDUMP_MSG ); |
130 | 0 | } |
131 | } |
This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |