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org.apache.derby.impl.sql.execute
Class IndexRow  

java.lang.Object
  org.apache.derby.impl.sql.execute.ValueRow
      org.apache.derby.impl.sql.execute.IndexRow

All Implemented Interfaces:

org.apache.derby.iapi.sql.execute.ExecIndexRow, org.apache.derby.iapi.sql.execute.ExecRow, java.io.Externalizable, org.apache.derby.iapi.services.io.Formatable, org.apache.derby.iapi.sql.Row, java.io.Serializable, org.apache.derby.iapi.services.io.TypedFormat

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public class IndexRow

extends ValueRow

implements org.apache.derby.iapi.sql.execute.ExecIndexRow

Basic implementation of ExecIndexRow.

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Field Summary
private  boolean[]	orderedNulls           This class implements Formatable.

 

Fields inherited from class org.apache.derby.impl.sql.execute.ValueRow

 

Constructor Summary

IndexRow()           Public niladic constructor.

IndexRow(int ncols)

 

Method Summary
boolean	areNullsOrdered(int columnPosition)           Return true if orderedNulls was called on this ExecIndexRow for the given column position.
(package private)  org.apache.derby.iapi.sql.execute.ExecRow	cloneMe()
void	execRowToExecIndexRow(org.apache.derby.iapi.sql.execute.ExecRow valueRow)           Turn the ExecRow into an ExecIndexRow.
int	getTypeFormatId()           Get the formatID which corresponds to this class.
void	orderedNulls(int columnPosition)           These two methods are a sort of a hack.
void	readExternal(java.io.ObjectInput in)           Read this object from a stream of stored objects.
void	writeExternal(java.io.ObjectOutput out)           Write this object to a stream of stored objects.

 

Methods inherited from class org.apache.derby.impl.sql.execute.ValueRow

cloneColumn, getClone, getClone, getColumn, getNewNullRow, getNewObjectArray, getRowArray, getRowArrayClone, nColumns, realloc, setColumn, setRowArray, setRowArray, toString

 

Methods inherited from class java.lang.Object

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

 

Methods inherited from interface org.apache.derby.iapi.sql.execute.ExecRow

cloneColumn, getClone, getClone, getNewNullRow, getNewObjectArray, getRowArray, getRowArrayClone, setRowArray, setRowArray

 

Methods inherited from interface org.apache.derby.iapi.sql.Row

getColumn, nColumns, setColumn

 

Field Detail

orderedNulls

private boolean[] orderedNulls

This class implements Formatable. That means that it can write itself to and from a formatted stream. If you add more fields to this class, make sure that you also write/read them with the writeExternal()/readExternal() methods. If, inbetween releases, you add more fields to this class, then you should bump the version number emitted by the getTypeFormatId() method.

Constructor Detail

IndexRow

public IndexRow()

Public niladic constructor. Needed for Formatable interface to work.

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IndexRow

public IndexRow(int ncols)

Method Detail

orderedNulls

public void orderedNulls(int columnPosition)

Description copied from interface: org.apache.derby.iapi.sql.execute.ExecIndexRow

These two methods are a sort of a hack. The store implements ordered null semantics for start and stop positioning, which is correct for IS NULL and incorrect for everything else. To work around this, TableScanResultSet will check whether the start and stop positions have NULL in any column position other than for an IS NULL check. If so, it won't do the scan (that is, it will return no rows). This method is to inform this ExecIndexRow (which can be used for start and stop positioning) that the given column uses ordered null semantics.

Specified by:

orderedNulls in interface org.apache.derby.iapi.sql.execute.ExecIndexRow

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areNullsOrdered

public boolean areNullsOrdered(int columnPosition)

Description copied from interface: org.apache.derby.iapi.sql.execute.ExecIndexRow

Return true if orderedNulls was called on this ExecIndexRow for the given column position.

Specified by:

areNullsOrdered in interface org.apache.derby.iapi.sql.execute.ExecIndexRow

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execRowToExecIndexRow

public void execRowToExecIndexRow(org.apache.derby.iapi.sql.execute.ExecRow valueRow)

Turn the ExecRow into an ExecIndexRow.

Specified by:

execRowToExecIndexRow in interface org.apache.derby.iapi.sql.execute.ExecIndexRow

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readExternal

public void readExternal(java.io.ObjectInput in)
                  throws java.io.IOException,
                         java.lang.ClassNotFoundException

Read this object from a stream of stored objects.

Specified by:

readExternal in interface java.io.Externalizable

Overrides:

readExternal in class ValueRow

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writeExternal

public void writeExternal(java.io.ObjectOutput out)
                   throws java.io.IOException

Write this object to a stream of stored objects.

Specified by:

writeExternal in interface java.io.Externalizable

Overrides:

writeExternal in class ValueRow

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getTypeFormatId

public int getTypeFormatId()

Get the formatID which corresponds to this class.

Specified by:

getTypeFormatId in interface org.apache.derby.iapi.services.io.TypedFormat

Overrides:

getTypeFormatId in class ValueRow

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cloneMe

org.apache.derby.iapi.sql.execute.ExecRow cloneMe()

Overrides:

cloneMe in class ValueRow

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Overview  Package   Class  Use  Deprecated  Index
Home >> All >> org >> apache >> derby >> impl >> sql >> [ execute overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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