modhelxs.state_management
Class Attribute<T>

java.lang.Object
  modhelxs.state_management.Value<T>
      modhelxs.state_management.Attribute<T>

All Implemented Interfaces:

StateValue

Direct Known Subclasses:

TransientValue

public class Attribute<T>
extends Value<T>
implements StateValue

An Attribute is a storage with commit and revert operations. An attribute has a permanent value, which is set at initialization time, and by the commit operation. It also has a transient value, which is set by the setValue operation. The transient value becomes the permanent value when commit is called. The transient value if forgotten when revert is called. The current value of an attribute is its transient value if it is set, or its permanent value otherwise.

Field Summary

private T	trans_value_ The transient value of the attribute, which will become its value after committing.
private boolean	was_set_

Constructor Summary

Attribute(java.lang.Class<T> type)
Create an attribute for storing a value of type type.

Attribute(java.lang.Class<T> type, boolean giveInitWarning)
Create an attribute for storing a value of type type.

Method Summary

void	commit() Commit the transient value into the permanent value.
T	getValue() Get the value of the attribute.
void	revert() Revert to the last committed value by forgetting the transient value.
void	setValue(T val) Set the transient value of the attribute.
void	setValue(Value<T> val) Set the transient value of the attribute.
java.lang.String	toString()

Methods inherited from class modhelxs.state_management.Value

getType, init, initFromProperty

Methods inherited from class java.lang.Object

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

Field Detail

trans_value_

private T trans_value_

The transient value of the attribute, which will become its value after committing.

was_set_

private boolean was_set_

Constructor Detail

Attribute

public Attribute(java.lang.Class<T> type,
                 boolean giveInitWarning)

Create an attribute for storing a value of type type.

Attribute

public Attribute(java.lang.Class<T> type)

Create an attribute for storing a value of type type.

Method Detail

getValue

public T getValue()

Get the value of the attribute. This is the transient value if setValue was called since the last call of commit, or the last committed (or initialized) value.

Overrides:

getValue in class Value<T>

setValue

public void setValue(T val)

Set the transient value of the attribute.

Overrides:

setValue in class Value<T>

setValue

public void setValue(Value<T> val)

Set the transient value of the attribute.

Overrides:

setValue in class Value<T>

commit

public void commit()

Commit the transient value into the permanent value.

Specified by:

commit in interface StateValue

revert

public void revert()

Revert to the last committed value by forgetting the transient value.

Specified by:

revert in interface StateValue

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object