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org.apache.commons.jexl.util.introspection.Introspector |
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1 | /* |
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2 | * Copyright 2001-2006 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 Hashtable 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 | * @since 1.0 |
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47 | * @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a> |
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48 | * @author <a href="mailto:bob@werken.com">Bob McWhirter</a> |
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49 | * @author <a href="mailto:szegedia@freemail.hu">Attila Szegedi</a> |
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50 | * @author <a href="mailto:paulo.gaspar@krankikom.de">Paulo Gaspar</a> |
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51 | * @version $Id: Introspector.java 398171 2006-04-29 14:57:29Z dion $ |
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52 | */ |
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53 | public class Introspector extends IntrospectorBase { |
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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 | private final Log rlog; |
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66 | ||
67 | /** |
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68 | * Recieves our RuntimeServices object. |
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69 | * @param logger a {@link Log}. |
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70 | */ |
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71 | 4 | public Introspector(Log logger) { |
72 | 4 | this.rlog = logger; |
73 | 4 | } |
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 | * @throws Exception if the superclass does. |
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86 | */ |
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87 | public Method getMethod(Class c, String name, Object[] params) throws Exception { |
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88 | /* |
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89 | * just delegate to the base class |
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90 | */ |
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91 | ||
92 | try { |
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93 | 98 | return super.getMethod(c, name, params); |
94 | } catch (MethodMap.AmbiguousException ae) { |
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95 | /* |
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96 | * whoops. Ambiguous. Make a nice log message and return null... |
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97 | */ |
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98 | ||
99 | 0 | StringBuffer msg = new StringBuffer("Introspection Error : Ambiguous method invocation ") |
100 | .append(name).append("( "); |
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101 | ||
102 | 0 | for (int i = 0; i < params.length; i++) { |
103 | 0 | if (i > 0) { |
104 | 0 | msg.append(", "); |
105 | } |
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106 | ||
107 | 0 | msg.append(params[i].getClass().getName()); |
108 | } |
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109 | ||
110 | 0 | msg.append(") for class ").append(c.getName()); |
111 | ||
112 | 0 | rlog.error(msg.toString()); |
113 | } |
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114 | ||
115 | 0 | return null; |
116 | } |
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117 | ||
118 | /** |
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119 | * Clears the classmap and classname |
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120 | * caches, and logs that we did so. |
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121 | */ |
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122 | protected void clearCache() { |
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123 | 0 | super.clearCache(); |
124 | 0 | rlog.info(CACHEDUMP_MSG); |
125 | 0 | } |
126 | } |
This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |