gov.sns.ca
Class ChannelFactory

java.lang.Object
  |
  +--gov.sns.ca.ChannelFactory

Direct Known Subclasses:

JcaChannelFactory

public abstract class ChannelFactory

extends java.lang.Object

ChannelFactory is a factory for generating channels.

Field Summary

protected java.util.Map	channelMap
protected static ChannelFactory	defaultFactory

Constructor Summary

protected

ChannelFactory() Creates a new instance of ChannelFactory

Method Summary

protected abstract ChannelSystem	channelSystem() Get the associated channel system from the channel factory implementation.
static ChannelFactory	defaultFactory() Get the default factory which determines the low level channel implementation
Channel	getChannel(java.lang.String signalName) Get a channel associated with the signal name.
Channel	getChannel(java.lang.String signalName, ValueTransform transform) Get a channel associated with the signal name.
abstract boolean	init() Initialize the channel system
protected abstract Channel	newChannel(java.lang.String signalName) Create a concrete channel which makes an appropriate low level channel
protected Channel	newChannel(java.lang.String signalName, ValueTransform transform) Create a new channel for the given signal name and set its value transform.
protected static ChannelFactory	newFactory() Instantiate a new ChannelFactory

Methods inherited from class java.lang.Object

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

Field Detail

defaultFactory

protected static ChannelFactory defaultFactory

channelMap

protected java.util.Map channelMap

Constructor Detail

ChannelFactory

protected ChannelFactory()

Creates a new instance of ChannelFactory

Method Detail

init

public abstract boolean init()

Initialize the channel system

Returns:

true if the initialization was successful and false if not

getChannel

public Channel getChannel(java.lang.String signalName)

Get a channel associated with the signal name. If the channel is already in our map, then return it, otherwise create a new one and add it to our channel map.

Parameters:

signalName - The PV signal name of the channel

Returns:

The channel corresponding to the signal name

getChannel

public Channel getChannel(java.lang.String signalName,
                          ValueTransform transform)

Get a channel associated with the signal name. If the channel is already in our map, then return it, otherwise create a new one and add it to our channel map.

Parameters:

signalName - The PV signal name of the channel

transform - The channel's value transform

Returns:

The channel corresponding to the signal name

newChannel

protected abstract Channel newChannel(java.lang.String signalName)

Create a concrete channel which makes an appropriate low level channel

Returns:

a new channel for the specified signal name

newChannel

protected Channel newChannel(java.lang.String signalName,
                             ValueTransform transform)

Create a new channel for the given signal name and set its value transform.

Parameters:

signalName - The PV signal name

transform - The value transform to use in the channel

Returns:

The new channel

defaultFactory

public static ChannelFactory defaultFactory()

Get the default factory which determines the low level channel implementation

Returns:

The default channel factory

channelSystem

protected abstract ChannelSystem channelSystem()

Get the associated channel system from the channel factory implementation.

Returns:

The channel system

newFactory

protected static ChannelFactory newFactory()

Instantiate a new ChannelFactory

Returns:

a new channel factory