edu.washington.cs.supple.rep.values
Class AsBooleanValue

java.lang.Object
  edu.washington.cs.supple.rep.values.Variable
      edu.washington.cs.supple.rep.values.AsBooleanValue

All Implemented Interfaces:

ValueBinding, ValueListener

public class AsBooleanValue

extends Variable

implements ValueBinding, ValueListener

AsBooleanValue converts a non-boolean value into a boolean according to a specified condition.

Author:

dbc1

Field Summary

ValueBinding	a
int	condition
static int	TRUE_BY_DEFAULT True if the value is true, not null, or not empty.
static int	TRUE_IF_EXACTLY_ONE_VALUE True if the value is a collection with only one element.
static int	TRUE_IF_FALSE True if the value is a boolean and false.
static int	TRUE_IF_MORE_THAN_ONE_VALUE True if the value is a collection with multiple elements.
static int	TRUE_IF_NOT_EMPTY True if the value is an empty collection.
static int	TRUE_IF_NULL True only if the value is null.
java.lang.Boolean	value

Constructor Summary

AsBooleanValue(ValueBinding a)

AsBooleanValue(ValueBinding a, int condition)

Method Summary

protected boolean	computeValue(java.lang.Object o) Determine if value of o is true according to the desired condition.
java.lang.Object	getValue() Get the bound value.
java.lang.Class	getValueClass() Get the class of this variable
protected void	postLastListener() Subclasses can use this to implement post-last-listener cleanup.
protected void	preFirstListener() Subclasses can use this to implement pre-first-listener setup.
void	setValue(java.lang.Object value) Set the value of this variable.
void	valueChanged(ValueBinding binding, java.lang.Object newValue) Signals variable change.

Methods inherited from class edu.washington.cs.supple.rep.values.Variable

addListener, processUpdate, removeListener

Methods inherited from class java.lang.Object

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

Methods inherited from interface edu.washington.cs.supple.rep.values.ValueBinding

addListener, removeListener

Field Detail

TRUE_BY_DEFAULT

public static final int TRUE_BY_DEFAULT

True if the value is true, not null, or not empty.

See Also:

Constant Field Values

TRUE_IF_NULL

public static final int TRUE_IF_NULL

True only if the value is null.

See Also:

Constant Field Values

TRUE_IF_EXACTLY_ONE_VALUE

public static final int TRUE_IF_EXACTLY_ONE_VALUE

True if the value is a collection with only one element.

See Also:

Constant Field Values

TRUE_IF_MORE_THAN_ONE_VALUE

public static final int TRUE_IF_MORE_THAN_ONE_VALUE

True if the value is a collection with multiple elements.

See Also:

Constant Field Values

TRUE_IF_NOT_EMPTY

public static final int TRUE_IF_NOT_EMPTY

True if the value is an empty collection.

See Also:

Constant Field Values

TRUE_IF_FALSE

public static final int TRUE_IF_FALSE

True if the value is a boolean and false.

See Also:

Constant Field Values

condition

public final int condition

a

public final ValueBinding a

value

public java.lang.Boolean value

Constructor Detail

AsBooleanValue

public AsBooleanValue(ValueBinding a)

AsBooleanValue

public AsBooleanValue(ValueBinding a,
                      int condition)

Method Detail

computeValue

protected boolean computeValue(java.lang.Object o)

Determine if value of o is true according to the desired condition.

getValueClass

public final java.lang.Class getValueClass()

Description copied from interface: ValueBinding

Get the class of this variable

Specified by:

getValueClass in interface ValueBinding

Returns:

getValue

public final java.lang.Object getValue()

Description copied from interface: ValueBinding

Get the bound value.

Specified by:

getValue in interface ValueBinding

Returns:

setValue

public final void setValue(java.lang.Object value)

Description copied from interface: ValueBinding

Set the value of this variable.

Specified by:

setValue in interface ValueBinding

Parameters:

value -

preFirstListener

protected void preFirstListener()

Description copied from class: Variable

Subclasses can use this to implement pre-first-listener setup.

Overrides:

preFirstListener in class Variable

postLastListener

protected void postLastListener()

Description copied from class: Variable

Subclasses can use this to implement post-last-listener cleanup.

Overrides:

postLastListener in class Variable

valueChanged

public final void valueChanged(ValueBinding binding,
                               java.lang.Object newValue)

Description copied from interface: ValueListener

Signals variable change.

Specified by:

valueChanged in interface ValueListener

Parameters:

binding -

newValue -