org.apache.axis
Class SimpleChain

java.lang.Object
  |
  +--org.apache.axis.handlers.BasicHandler
        |
        +--org.apache.axis.SimpleChain

All Implemented Interfaces:

Chain, Handler, java.io.Serializable

Direct Known Subclasses:

SimpleTargetedChain

public class SimpleChain

extends BasicHandler

implements Chain

A Simple Chain is a 'composite' Handler in that it aggregates a collection of Handlers and also acts as a Handler which delegates its operations to the collection.

A Simple Chain initially has no Handlers. Handlers may be added until the chain is invoke()d after which Handlers may not be added (and any attempt to do so will throw an exception).

Author:

Doug Davis (dug@us.ibm.com), Glyn Normington (norm@uk.ibm.com)

See Also:

Serialized Form

Field Summary

protected java.util.Vector	handlers
protected boolean	invoked
protected static org.apache.commons.logging.Log	log

Fields inherited from class org.apache.axis.handlers.BasicHandler

name, options

Constructor Summary

SimpleChain()

Method Summary

void	addHandler(Handler handler) Adds a handler to the end of the chain.
boolean	canHandleBlock(QName qname) Can this Handler process this QName?
void	cleanup() Cleanup is called when the chain containing this Handler object is done processing the chain.
boolean	contains(Handler handler) Is this handler in the chain?
void	generateWSDL(MessageContext msgContext) Iterate over the chain letting each handler have a crack at contributing to a WSDL description.
org.w3c.dom.Element	getDeploymentData(org.w3c.dom.Document doc) This will return the root element of an XML doc that describes the deployment information about this handler.
Handler[]	getHandlers() Get the list of handlers in the chain - is Handler[] the right form?
void	init() Init is called when the chain containing this Handler object is instantiated.
void	invoke(MessageContext msgContext) Iterate over the chain invoking each handler.
void	onFault(MessageContext msgContext) Notify the handlers in this chain because some handler later on has faulted - in reverse order.

Methods inherited from class org.apache.axis.handlers.BasicHandler

getName, getOption, getOptions, getUnderstoodHeaders, initHashtable, setName, setOption, setOptionDefault, setOptions

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.axis.Handler

getName, getOption, getOptions, getUnderstoodHeaders, setName, setOption, setOptions

Field Detail

log

protected static org.apache.commons.logging.Log log

handlers

protected java.util.Vector handlers

invoked

protected boolean invoked

Constructor Detail

SimpleChain

public SimpleChain()

Method Detail

init

public void init()

Description copied from interface: Handler

Init is called when the chain containing this Handler object is instantiated.

Specified by:

init in interface Handler

Overrides:

init in class BasicHandler

cleanup

public void cleanup()

Description copied from interface: Handler

Cleanup is called when the chain containing this Handler object is done processing the chain.

Specified by:

cleanup in interface Handler

Overrides:

cleanup in class BasicHandler

invoke

public void invoke(MessageContext msgContext)
            throws AxisFault

Iterate over the chain invoking each handler. If there's a fault then call 'onFault' for each completed handler in reverse order, then rethrow the exception.

Specified by:

invoke in interface Handler

Overrides:

invoke in class BasicHandler

generateWSDL

public void generateWSDL(MessageContext msgContext)
                  throws AxisFault

Iterate over the chain letting each handler have a crack at contributing to a WSDL description.

Specified by:

generateWSDL in interface Handler

Overrides:

generateWSDL in class BasicHandler

onFault

public void onFault(MessageContext msgContext)

Notify the handlers in this chain because some handler later on has faulted - in reverse order. If any handlers have been added since we visited the chain, they will get notified too!

Specified by:

onFault in interface Handler

Overrides:

onFault in class BasicHandler

canHandleBlock

public boolean canHandleBlock(QName qname)

Description copied from interface: Handler

Can this Handler process this QName?

Specified by:

canHandleBlock in interface Handler

Overrides:

canHandleBlock in class BasicHandler

addHandler

public void addHandler(Handler handler)

Description copied from interface: Chain

Adds a handler to the end of the chain. May not be called after invoke.

Specified by:

addHandler in interface Chain

contains

public boolean contains(Handler handler)

Description copied from interface: Chain

Is this handler in the chain?

Specified by:

contains in interface Chain

getHandlers

public Handler[] getHandlers()

Description copied from interface: Chain

Get the list of handlers in the chain - is Handler[] the right form?

Specified by:

getHandlers in interface Chain

getDeploymentData

public org.w3c.dom.Element getDeploymentData(org.w3c.dom.Document doc)

Description copied from interface: Handler

This will return the root element of an XML doc that describes the deployment information about this handler. This is NOT the WSDL, this is all of the static internal data use by Axis - WSDL takes into account run-time information (like which service we're talking about) this is just the data that's stored in the registry. Used by the 'list' Admin function.

Specified by:

getDeploymentData in interface Handler

Overrides:

getDeploymentData in class BasicHandler