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Evaluating Software Design Patterns — the "Gang of Four" patterns implemented in Java 6 |
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java.lang.Object dk.rode.thesis.factorymethod.CommandCreator<E,Sequence.State> dk.rode.thesis.factorymethod.SequenceCommandCreator<E>
E
- The type of values delivered by created commands (and thus sequences).@Participant(value="ConcreteCreator") public class SequenceCommandCreator<E>
A standard command creator creates new
commands
based on sequence states
as tokens.
This creator can create the following commands based on the supplied internal sequence state:
NullCommand
is returned.
Sequence.State.NORMAL
:
creates a new NextCommand
instance.
Sequence.State.RESET
:
creates a new ResetCommand
instance.
CommandCreator.createDefault(Sequence)
is returned, if not null; if null, a null command is returned.
Constructor Summary | |
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SequenceCommandCreator()
No-arg constructor. |
Method Summary | |
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protected Command<E> |
create(Sequence<E> sequence,
Sequence.State state)
Factory method to create a new command of the
type specified by the token supplied as token . |
Methods inherited from class dk.rode.thesis.factorymethod.CommandCreator |
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createDefault, equals, getCommand, hashCode, toString |
Methods inherited from class java.lang.Object |
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clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public SequenceCommandCreator()
Method Detail |
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protected Command<E> create(Sequence<E> sequence, Sequence.State state) throws Exception
CommandCreator
command
of the
type specified by the token supplied as token
.
The sequence
set as the receiver is supplied
as sequence
.
create
in class CommandCreator<E,Sequence.State>
sequence
- The sequence; never null.state
- The token identifying the type of command to create;
can be null.
CommandCreator.getCommand(Sequence, Object)
.
Exception
- If the creation fails; if so, a default (or null)
command will be returned by getCommand
.CommandCreator.createDefault(Sequence)
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Gunni Rode / rode.dk | ||||||||
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