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org.apache.commons.jexl.util.introspection.Introspector	32%	67%

1		/*
2		* Copyright 2001,2004 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 Hastable 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		* @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a>
47		* @author <a href="mailto:bob@werken.com">Bob McWhirter</a>
48		* @author <a href="mailto:szegedia@freemail.hu">Attila Szegedi</a>
49		* @author <a href="mailto:paulo.gaspar@krankikom.de">Paulo Gaspar</a>
50		* @version $Id: Introspector.java,v 1.6 2004/08/23 13:50:00 dion Exp $
51		*/
52		public class Introspector extends IntrospectorBase
53		{
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	30	private Log rlog = null;
66
67		/**
68		* Recieves our RuntimeServices object
69		*/
70	2	public Introspector(Log logger)
71	28	{
72	30	this.rlog = logger;
73	30	}
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		*/
86		public Method getMethod(Class c, String name, Object[] params)
87		throws Exception
88		{
89		/*
90		* just delegate to the base class
91		*/
92
93		try
94		{
95	1131	return super.getMethod( c, name, params );
96		}
97		catch( MethodMap.AmbiguousException ae )
98		{
99		/*
100		* whoops. Ambiguous. Make a nice log message and return null...
101		*/
102
103	0	String msg = "Introspection Error : Ambiguous method invocation "
104		+ name + "( ";
105
106	0	for (int i = 0; i < params.length; i++)
107		{
108	0	if ( i > 0)
109	0	msg += ", ";
110
111	0	msg += params[i].getClass().getName();
112		}
113
114	0	msg = msg + ") for class " + c;
115
116	0	rlog.error( msg );
117		}
118
119	0	return null;
120		}
121
122		/**
123		* Clears the classmap and classname
124		* caches, and logs that we did so
125		*/
126		protected void clearCache()
127		{
128	0	super.clearCache();
129	0	rlog.info( CACHEDUMP_MSG );
130	0	}
131		}

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