Package org.apache.velocity.util.introspection

Class Introspector

java.lang.Object

org.apache.velocity.util.introspection.IntrospectorBase

org.apache.velocity.util.introspection.Introspector

Direct Known Subclasses:

SecureIntrospectorImpl

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:

$Id$

Author:

Jason van Zyl, Bob McWhirter, Attila Szegedi, Paulo Gaspar, Henning P. Schmiedehausen

Field Summary

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

log

Constructor Summary

Constructors

Constructor	Description
Introspector(org.slf4j.Logger log)
Introspector(org.slf4j.Logger log, TypeConversionHandler conversionHandler)

Method Summary

Modifier and Type	Method	Description
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

getField, getIntrospectorCache

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Introspector

public Introspector(org.slf4j.Logger log)

Parameters:

log - A Logger object to use for the introspector.

Since:

1.5

Introspector

public Introspector(org.slf4j.Logger log,
                    TypeConversionHandler conversionHandler)

Parameters:

log - A Logger object to use for the introspector.

conversionHandler - conversion handler

Since:

2.0

Method Detail

getMethod

public Method getMethod(Class<?> c,
                        String name,
                        Object[] params)
                 throws IllegalArgumentException

Gets the method defined by name and params for the Class c.

Overrides:

getMethod in class 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.

Throws:

IllegalArgumentException - When the parameters passed in can not be used for introspection.