| %line | %branch | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| org.apache.commons.jexl.util.introspection.Introspector |
|
|
| 1 | /* |
|
| 2 | * Copyright 2001-2006 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 | ||
| 17 | package org.apache.commons.jexl.util.introspection; |
|
| 18 | ||
| 19 | import java.lang.reflect.Method; |
|
| 20 | ||
| 21 | import org.apache.commons.logging.Log; |
|
| 22 | ||
| 23 | ||
| 24 | /** |
|
| 25 | * This basic function of this class is to return a Method |
|
| 26 | * object for a particular class given the name of a method |
|
| 27 | * and the parameters to the method in the form of an Object[] |
|
| 28 | * |
|
| 29 | * The first time the Introspector sees a |
|
| 30 | * class it creates a class method map for the |
|
| 31 | * class in question. Basically the class method map |
|
| 32 | * is a Hashtable where Method objects are keyed by a |
|
| 33 | * concatenation of the method name and the names of |
|
| 34 | * classes that make up the parameters. |
|
| 35 | * |
|
| 36 | * For example, a method with the following signature: |
|
| 37 | * |
|
| 38 | * public void method(String a, StringBuffer b) |
|
| 39 | * |
|
| 40 | * would be mapped by the key: |
|
| 41 | * |
|
| 42 | * "method" + "java.lang.String" + "java.lang.StringBuffer" |
|
| 43 | * |
|
| 44 | * This mapping is performed for all the methods in a class |
|
| 45 | * and stored for |
|
| 46 | * @since 1.0 |
|
| 47 | * @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a> |
|
| 48 | * @author <a href="mailto:bob@werken.com">Bob McWhirter</a> |
|
| 49 | * @author <a href="mailto:szegedia@freemail.hu">Attila Szegedi</a> |
|
| 50 | * @author <a href="mailto:paulo.gaspar@krankikom.de">Paulo Gaspar</a> |
|
| 51 | * @version $Id: Introspector.java 398171 2006-04-29 14:57:29Z dion $ |
|
| 52 | */ |
|
| 53 | public class Introspector extends IntrospectorBase { |
|
| 54 | /** |
|
| 55 | * define a public string so that it can be looked for |
|
| 56 | * if interested. |
|
| 57 | */ |
|
| 58 | ||
| 59 | public static final String CACHEDUMP_MSG = |
|
| 60 | "Introspector : detected classloader change. Dumping cache."; |
|
| 61 | ||
| 62 | /** |
|
| 63 | * our engine runtime services. |
|
| 64 | */ |
|
| 65 | private final Log rlog; |
|
| 66 | ||
| 67 | /** |
|
| 68 | * Recieves our RuntimeServices object. |
|
| 69 | * @param logger a {@link Log}. |
|
| 70 | */ |
|
| 71 | 4 | public Introspector(Log logger) { |
| 72 | 4 | this.rlog = logger; |
| 73 | 4 | } |
| 74 | ||
| 75 | /** |
|
| 76 | * Gets the method defined by <code>name</code> and |
|
| 77 | * <code>params</code> for the Class <code>c</code>. |
|
| 78 | * |
|
| 79 | * @param c Class in which the method search is taking place |
|
| 80 | * @param name Name of the method being searched for |
|
| 81 | * @param params An array of Objects (not Classes) that describe the |
|
| 82 | * the parameters |
|
| 83 | * |
|
| 84 | * @return The desired Method object. |
|
| 85 | * @throws Exception if the superclass does. |
|
| 86 | */ |
|
| 87 | public Method getMethod(Class c, String name, Object[] params) throws Exception { |
|
| 88 | /* |
|
| 89 | * just delegate to the base class |
|
| 90 | */ |
|
| 91 | ||
| 92 | try { |
|
| 93 | 98 | return super.getMethod(c, name, params); |
| 94 | } catch (MethodMap.AmbiguousException ae) { |
|
| 95 | /* |
|
| 96 | * whoops. Ambiguous. Make a nice log message and return null... |
|
| 97 | */ |
|
| 98 | ||
| 99 | 0 | StringBuffer msg = new StringBuffer("Introspection Error : Ambiguous method invocation ") |
| 100 | .append(name).append("( "); |
|
| 101 | ||
| 102 | 0 | for (int i = 0; i < params.length; i++) { |
| 103 | 0 | if (i > 0) { |
| 104 | 0 | msg.append(", "); |
| 105 | } |
|
| 106 | ||
| 107 | 0 | msg.append(params[i].getClass().getName()); |
| 108 | } |
|
| 109 | ||
| 110 | 0 | msg.append(") for class ").append(c.getName()); |
| 111 | ||
| 112 | 0 | rlog.error(msg.toString()); |
| 113 | } |
|
| 114 | ||
| 115 | 0 | return null; |
| 116 | } |
|
| 117 | ||
| 118 | /** |
|
| 119 | * Clears the classmap and classname |
|
| 120 | * caches, and logs that we did so. |
|
| 121 | */ |
|
| 122 | protected void clearCache() { |
|
| 123 | 0 | super.clearCache(); |
| 124 | 0 | rlog.info(CACHEDUMP_MSG); |
| 125 | 0 | } |
| 126 | } |
| This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |