SargIntervalExpr

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org.eigenbase.sarg
Class SargIntervalExpr

java.lang.Object
  org.eigenbase.sarg.SargIntervalBase
      org.eigenbase.sarg.SargIntervalExpr

All Implemented Interfaces:: SargExpr

public class SargIntervalExpr
extends SargIntervalBase
implements SargExpr
extends SargIntervalBase
implements SargExpr

SargIntervalExpr represents an expression which can be resolved to a fixed SargInterval.

Null values require special treatment in expressions. Normally, for intervals of any kind, nulls are not considered to be within the domain of search values. This behavior can be modified by setting the SqlNullSemantics to a value other than the default. This happens implicitly when a point interval is created matching the null value. When null values are considered to be part of the domain, the ordering is defined as for SargInterval.

Version:: $Id: //open/dev/farrago/src/org/eigenbase/sarg/SargIntervalExpr.java#13 $
Author:: John V. Sichi

Field Summary
`private SqlNullSemantics`	`nullSemantics`

Fields inherited from class org.eigenbase.sarg.SargIntervalBase
`factory, lowerBound, upperBound`

Constructor Summary
`SargIntervalExpr(SargFactory factory, RelDataType dataType, SqlNullSemantics nullSemantics)`

Method Summary
`void`	`collectDynamicParams(Set<RexDynamicParam> dynamicParams)` Collects all dynamic parameters referenced by this expression.
`SargIntervalSequence`	`evaluate()` Resolves this expression into a fixed `SargIntervalSequence`.
`SargIntervalSequence`	`evaluateComplemented()` Resolves the complement of this expression into a fixed `SargIntervalSequence`.
`SqlNullSemantics`	`getNullSemantics()`
`void`	`setEmpty()` Sets this interval to empty (matching nothing at all).
`void`	`setLower(RexNode coordinate, SargStrictness strictness)` Sets the lower bound for this interval.
`void`	`setNull()` Sets this interval to represent a single point matching the null value.
`void`	`setPoint(RexNode coordinate)` Sets this interval to represent a single point (possibly the null value).
`void`	`setUnconstrained()` Sets this interval to unconstrained (matching everything, including null).
`void`	`setUpper(RexNode coordinate, SargStrictness strictness)` Sets the upper bound for this interval.
`String`	`toString()` Overrides the default Object.toString.
`void`	`unsetLower()` Removes the lower bound for this interval, setting it to -infinity.
`void`	`unsetUpper()` Removes the upper bound for this interval, setting it to +infinity.

Methods inherited from class org.eigenbase.sarg.SargIntervalBase
`getDataType, getFactory, getLowerBound, getUpperBound, isEmpty, isPoint, isRange, isUnconstrained`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Methods inherited from interface org.eigenbase.sarg.SargExpr
`getDataType, getFactory`

Field Detail

nullSemantics

private SqlNullSemantics nullSemantics

Constructor Detail

SargIntervalExpr

SargIntervalExpr(SargFactory factory,
                 RelDataType dataType,
                 SqlNullSemantics nullSemantics)

See Also:: SargFactory.newIntervalExpr(org.eigenbase.reltype.RelDataType)

Method Detail

getNullSemantics

public SqlNullSemantics getNullSemantics()

Returns:: null semantics which apply for searches on this interval