org.apache.velocity.util.introspection

Class IntrospectorBase

Known Direct Subclasses:
Introspector

public class IntrospectorBase
extends java.lang.Object

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: IntrospectorBase.java,v 1.2 2001/12/05 23:43:55 jvanzyl Exp $

Authors:
Jason van Zyl
Bob McWhirter
Attila Szegedi
Paulo Gaspar

Field Summary

protected Set
cachedClassNames
Holds the qualified class names for the classes we hold in the classMethodMaps hash
protected Map
classMethodMaps
Holds the method maps for the classes we know about, keyed by Class object.

Method Summary

protected void
clearCache()
Clears the classmap and classname caches
protected ClassMap
createClassMap(Class c)
Creates a class map for specific class and registers it in the cache.
Method
getMethod(Class c, String name, Object[] params)
Gets the method defined by name and params for the Class c.

Field Details

cachedClassNames

protected Set cachedClassNames
Holds the qualified class names for the classes we hold in the classMethodMaps hash


classMethodMaps

protected Map classMethodMaps
Holds the method maps for the classes we know about, keyed by Class object.

Method Details

clearCache

protected void clearCache()
Clears the classmap and classname caches


createClassMap

protected ClassMap createClassMap(Class c)
Creates a class map for specific class and registers it in the cache. Also adds the qualified name to the name->class map for later Classloader change detection.


getMethod

public Method getMethod(Class c,
                        String name,
                        Object[] params)
            throws Exception
Gets the method defined by name and params for the Class c.

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 © 2003 Apache Software Foundation. All Rights Reserved.