Class Introspector

  extended by org.apache.velocity.util.introspection.IntrospectorBase
      extended by org.apache.velocity.util.introspection.Introspector
All Implemented Interfaces:
Direct Known Subclasses:

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

$Id: 477003 2006-11-20 01:14:22Z henning $
Jason van Zyl, Bob McWhirter, Attila Szegedi, Paulo Gaspar, Henning P. Schmiedehausen

Field Summary
static String CACHEDUMP_MSG
          define a public string so that it can be looked for if interested
Fields inherited from class org.apache.velocity.util.introspection.IntrospectorBase
Constructor Summary
Introspector(Log log)
Introspector(RuntimeLogger logger)
          Deprecated. RuntimeLogger is deprecated. Use Introspector(Log log).
Method Summary
 Method getMethod(Class c, String name, Object[] params)
          Gets the method defined by name and params for the Class c.
 void triggerClear()
          Logs that the Introspector Cache has been cleared.
Methods inherited from class org.apache.velocity.util.introspection.IntrospectorBase
clearCache, createClassMap, getIntrospectorCache, lookupClassMap, triggerGet, triggerPut
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail


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


public Introspector(Log log)
log - A Log object to use for the introspector.


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

logger - A runtime logger object.
Method Detail


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

getMethod in class IntrospectorBase
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
The desired Method object.
IllegalArgumentException - When the parameters passed in can not be used for introspection.


public void triggerClear()
Logs that the Introspector Cache has been cleared.

Specified by:
triggerClear in interface IntrospectorCacheListener
triggerClear in class IntrospectorBase
See Also:

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