| org.apache.derby.iapi.store.access.BinaryOrderable
| BinaryOrderable | | public interface BinaryOrderable extends Orderable(Code) | | The Orderable interface represents a value that can
be linearly ordered.
Currently only supports linear (<, =, <=) operations.
Eventually we may want to do other types of orderings,
in which case there would probably be a number of interfaces
for each "class" of ordering.
The implementation must handle the comparison of null
values. This may require some changes to the interface,
since (at least in some contexts) comparing a value with
null should return unknown instead of true or false.
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| Method Summary | |
| int | binarycompare(ObjectInput in, Orderable other)
Compare this Orderable with a given Orderable for the purpose of
index positioning. | | boolean | binarycompare(ObjectInput in, int op, Orderable other, boolean orderedNulls, boolean unknownRV)
Compare this Orderable with a given Orderable for the purpose of
qualification and sorting. |
| binarycompare | | int binarycompare(ObjectInput in, Orderable other) throws IOException(Code) | | Compare this Orderable with a given Orderable for the purpose of
index positioning. This method treats nulls as ordered values -
that is, it treats SQL null as equal to null and less than all
other values.
Parameters:
other - The Orderable to compare this one to. <0 - this Orderable is less than other.0 - this Orderable equals other.>0 - this Orderable is greater than other.The code should not explicitly look for -1, or 1.
exception:
IOException - Thrown on error |
| binarycompare | | boolean binarycompare(ObjectInput in, int op, Orderable other, boolean orderedNulls, boolean unknownRV) throws IOException(Code) | | Compare this Orderable with a given Orderable for the purpose of
qualification and sorting. The caller gets to determine how nulls
should be treated - they can either be ordered values or unknown
values.
Parameters:
op - Orderable.ORDER_OP_EQUALS means do an = comparison.Orderable.ORDER_OP_LESSTHAN means compare this < other.Orderable.ORDER_OP_LESSOREQUALS means compare this <= other.
Parameters:
other - The Orderable to compare this one to.
Parameters:
orderedNulls - True means to treat nulls as ordered values,that is, treat SQL null as equal to null, and lessthan all other values.False means to treat nulls as unknown values,that is, the result of any comparison with a nullis the UNKNOWN truth value.
Parameters:
unknownRV - The return value to use if the result of thecomparison is the UNKNOWN truth value. In otherwords, if orderedNulls is false, and a null isinvolved in the comparison, return unknownRV.This parameter is not used orderedNulls is true. true if the comparison is true.
exception:
IOException - Thrown on error |
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