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java.lang.Objectorg.axiondb.constraints.BaseConstraint
org.axiondb.constraints.BaseSelectableBasedConstraint
org.axiondb.constraints.NullConstraint
public class NullConstraint
A NULL constraint, which is never violated but may be created and dropped.
Constructor Summary | |
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NullConstraint()
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NullConstraint(java.lang.String name)
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Method Summary | |
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boolean |
evaluate(RowEvent event)
Returns true . |
boolean |
evaluate(RowEvent event,
RowDecorator dec)
Evaluate the given event under me. |
boolean |
evaluate(RowIterator oldRows,
RowIterator newRows,
Table table)
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Methods inherited from class org.axiondb.constraints.BaseSelectableBasedConstraint |
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addSelectable, getSelectable, getSelectableCount, getSelectableList, getSelectables, resolve |
Methods inherited from class org.axiondb.constraints.BaseConstraint |
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getName, getType, isDeferrable, isDeferred, setDeferrable, setDeferred, setName, toArray |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Methods inherited from interface org.axiondb.Constraint |
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getName, getType, isDeferrable, isDeferred, setDeferrable, setDeferred, setName |
Constructor Detail |
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public NullConstraint()
public NullConstraint(java.lang.String name)
Method Detail |
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public boolean evaluate(RowEvent event) throws AxionException
true
.
evaluate
in interface Constraint
evaluate
in class BaseSelectableBasedConstraint
AxionException
public boolean evaluate(RowEvent event, RowDecorator dec) throws AxionException
Constraint
false
if the
constraint I represent has been violated.
evaluate
in interface Constraint
evaluate
in class BaseSelectableBasedConstraint
AxionException
public boolean evaluate(RowIterator oldRows, RowIterator newRows, Table table) throws AxionException
evaluate
in interface Constraint
evaluate
in class BaseSelectableBasedConstraint
AxionException
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