uk.ac.ed.epcc.safe.accounting.selector

Class NullSelector<T>

java.lang.Object

uk.ac.ed.epcc.safe.accounting.selector.NullSelector<T>

All Implemented Interfaces:

RecordSelector

public final class NullSelector<T>
extends java.lang.Object
implements RecordSelector

Field Summary

Fields

Modifier and Type	Field and Description
PropExpression<T>	expr
boolean	is_null

Constructor Summary

Constructors

Constructor and Description
NullSelector(PropExpression<T> exp, boolean is_null)

Method Summary

Methods

Modifier and Type	Method and Description
NullSelector<T>	copy() return a copy of the RecordSelector.
boolean	equals(java.lang.Object obj)
int	hashCode()
<R> R	visit(SelectorVisitor<R> visitor)

Methods inherited from class java.lang.Object

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

Field Detail

expr

public final PropExpression<T> expr

is_null

public final boolean is_null

Constructor Detail

NullSelector

public NullSelector(PropExpression<T> exp,
            boolean is_null)

Method Detail

visit

public <R> R visit(SelectorVisitor<R> visitor)
        throws java.lang.Exception

Specified by:

visit in interface RecordSelector

Throws:

java.lang.Exception

copy

public NullSelector<T> copy()

Description copied from interface: RecordSelector

return a copy of the RecordSelector. This may be a self reference if the object is immutable. Normally implementing sub-classes should be immutable (calling copy on any RecordSelector sub-arguments. In this case the return type should be narrowed to the sub-type.

Specified by:

copy in interface RecordSelector

Returns:

RecordSelector

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

equals

public boolean equals(java.lang.Object obj)

Overrides:

equals in class java.lang.Object