org.apache.commons.jexl.util.introspection

Class Introspector

java.lang.Object

org.apache.commons.jexl.util.introspection.IntrospectorBase

org.apache.commons.jexl.util.introspection.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 Hashtable 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

Since:

1.0

Version:

$Id: Introspector.java 584046 2007-10-12 05:14:37Z proyal $

Author:

Jason van Zyl, Bob McWhirter, Attila Szegedi, Paulo Gaspar

Field Summary

Fields

Modifier and Type	Field and Description
static String	CACHEDUMP_MSG define a public string so that it can be looked for if interested.

Fields inherited from class org.apache.commons.jexl.util.introspection.IntrospectorBase

classMethodMaps

Constructor Summary

Constructors

Constructor and Description
Introspector(org.apache.commons.logging.Log logger) Recieves our RuntimeServices object.

Method Summary

Modifier and Type	Method and Description
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.commons.jexl.util.introspection.IntrospectorBase

createClassMap

Methods inherited from class java.lang.Object

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

Field Detail

CACHEDUMP_MSG

public static final String CACHEDUMP_MSG

define a public string so that it can be looked for if interested.

See Also:

Constant Field Values

Constructor Detail

Introspector

public Introspector(org.apache.commons.logging.Log logger)

Recieves our RuntimeServices object.

Parameters:

logger - a Log.

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.

clearCache

protected void clearCache()

Clears the classmap and classname caches, and logs that we did so.

Overrides:

clearCache in class IntrospectorBase