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## 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
`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`.

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.

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