org.apache.turbine.modules
Class NavigationLoader

java.lang.Object
  java.util.Dictionary
      java.util.Hashtable
          org.apache.turbine.modules.GenericLoader
              org.apache.turbine.modules.NavigationLoader

All Implemented Interfaces:

java.lang.Cloneable, Loader, java.util.Map, java.io.Serializable

public class NavigationLoader

extends GenericLoader

implements Loader

The purpose of this class is to allow one to load and execute Navigation modules.

Version:

$Id: NavigationLoader.java 264148 2005-08-29 14:21:04Z henning $

Author:

Dave Bryson, Henning P. Schmiedehausen

See Also:

Serialized Form

Method Summary

org.apache.ecs.ConcreteElement	eval(RunData data, java.lang.String name) Attempts to load and execute the external Navigation.
void	exec(RunData data, java.lang.String name) Attempts to load and execute the external Navigation.
Assembler	getAssembler(java.lang.String name) Pulls out an instance of the object by name.
static NavigationLoader	getInstance() The method through which this class is accessed.
Navigation	getInstance(java.lang.String name) Pulls out an instance of the Navigation by name.

Methods inherited from class org.apache.turbine.modules.GenericLoader

cache, getBasePackage, reload, setReload

Methods inherited from class java.util.Hashtable

clear, clone, contains, containsKey, containsValue, elements, entrySet, equals, get, hashCode, isEmpty, keys, keySet, put, putAll, rehash, remove, size, toString, values

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Method Detail

eval

public org.apache.ecs.ConcreteElement eval(RunData data,
                                           java.lang.String name)
                                    throws java.lang.Exception

Attempts to load and execute the external Navigation. This is used when you want to execute a Navigation which returns its output via a MultiPartElement instead of out the data.getPage() value. This allows you to easily chain the execution of Navigation modules together.

Parameters:

data - Turbine information.

name - Name of object that will execute the navigation.

Throws:

java.lang.Exception - a generic exception.

exec

public void exec(RunData data,
                 java.lang.String name)
          throws java.lang.Exception

Attempts to load and execute the external Navigation.

Specified by:

exec in class GenericLoader

Parameters:

data - Turbine information.

name - Name of object instance.

Throws:

java.lang.Exception - a generic exception.

getAssembler

public Assembler getAssembler(java.lang.String name)
                       throws java.lang.Exception

Pulls out an instance of the object by name. Name is just the single name of the object. This is equal to getInstance but returns an Assembler object and is needed to fulfil the Loader interface.

Specified by:

getAssembler in interface Loader

Parameters:

name - Name of object instance.

Returns:

A Layout with the specified name, or null.

Throws:

java.lang.Exception - a generic exception.

getInstance

public Navigation getInstance(java.lang.String name)
                       throws java.lang.Exception

Pulls out an instance of the Navigation by name. Name is just the single name of the Navigation.

Parameters:

name - Name of requested Navigation

Returns:

A Navigation with the specified name, or null.

Throws:

java.lang.Exception - a generic exception.

getInstance

public static NavigationLoader getInstance()

The method through which this class is accessed.

Returns:

The single instance of this class.