org.apache.velocity.util.introspection

Class Introspector


public class Introspector
extends IntrospectorBase

This basic function of this class is to return a Method object for a particular class given the name of a method and the parameters to the method in the form of an Object[] The first time the Introspector sees a class it creates a class method map for the class in question. Basically the class method map is a Hastable where Method objects are keyed by a concatenation of the method name and the names of classes that make up the parameters. For example, a method with the following signature: public void method(String a, StringBuffer b) would be mapped by the key: "method" + "java.lang.String" + "java.lang.StringBuffer" This mapping is performed for all the methods in a class and stored for
Version:
$Id: Introspector.java,v 1.21.4.1 2004/03/03 23:23:08 geirm Exp $
Authors:
Jason van Zyl
Bob McWhirter
Attila Szegedi
Paulo Gaspar

Field Summary

static String
CACHEDUMP_MSG
define a public string so that it can be looked for if interested
private RuntimeLogger
rlog
our engine runtime services

Fields inherited from class org.apache.velocity.util.introspection.IntrospectorBase

cachedClassNames, classMethodMaps

Constructor Summary

Introspector(RuntimeLogger logger)
Recieves our RuntimeServices object

Method Summary

protected void
clearCache()
Clears the classmap and classname caches, and logs that we did so
Method
getMethod(Class c, String name, Object[] params)
Gets the method defined by name and params for the Class c.

Methods inherited from class org.apache.velocity.util.introspection.IntrospectorBase

clearCache, createClassMap, getMethod

Field Details

CACHEDUMP_MSG

public static final String CACHEDUMP_MSG
define a public string so that it can be looked for if interested

rlog

private RuntimeLogger rlog
our engine runtime services

Constructor Details

Introspector

public Introspector(RuntimeLogger logger)
Recieves our RuntimeServices object

Method Details

clearCache

protected void clearCache()
Clears the classmap and classname caches, and logs that we did so
Overrides:
clearCache in interface IntrospectorBase

getMethod

public Method getMethod(Class c,
                        String name,
                        Object[] params)
            throws Exception
Gets the method defined by name and params for the Class c.
Overrides:
getMethod in interface IntrospectorBase
Parameters:
c - Class in which the method search is taking place
name - Name of the method being searched for
params - An array of Objects (not Classes) that describe the the parameters
Returns:
The desired Method object.

Copyright B) 2002 Apache Software Foundation. All Rights Reserved.