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: Introspector.java 687177 2008-08-19 22:00:32Z nbubna $

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 and Description
Introspector(Log log)
Introspector(RuntimeLogger logger) Deprecated. RuntimeLogger is deprecated. Use Introspector(Log log).

Method Summary

Modifier and Type	Method and 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

getIntrospectorCache

Methods inherited from class java.lang.Object

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

Constructor Detail

Introspector

public Introspector(Log log)

Parameters:

log - A Log object to use for the introspector.

Since:

1.5

Introspector

public Introspector(RuntimeLogger logger)

Deprecated. RuntimeLogger is deprecated. Use Introspector(Log log).

Parameters:

logger - A runtime logger object.

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.