wt.query
Class GroupByClause

java.lang.Object
  wt.query.ListClause
      wt.query.GroupByClause

All Implemented Interfaces:

Cloneable, Externalizable, Serializable, SQLClause

public class GroupByClause

extends ListClause

implements Externalizable

This class represents a GROUP BY SQL clause.

Supported API: false

Extendable: false

See Also:

Serialized Form

Nested Class Summary

(package private) class

GroupByClause.Item

Field Summary

private static String	CLASSNAME
static long	EXTERNALIZATION_VERSION_UID
protected static long	OLD_FORMAT_VERSION_UID
protected static long	OLD_SERIAL_VERSION_UID
private static String	RESOURCE
(package private) static long	serialVersionUID

Fields inherited from class wt.query.ListClause

Fields inherited from interface wt.query.SQLClause

COUNT

Constructor Summary

GroupByClause()

Method Summary

void	append(ColumnExpression a_groupBy, int[] a_fromIndicies, FromClause a_fromClause) Appends the ColumnExpression to the clause.
Object	clone() Returns a deep copy of this object.
protected ColumnExpression	getColumnExpression(int a_index) Supported API: false
protected String	getExpression(int a_index, Vector a_tableInfos, Vector a_aliases) Supported API: false
protected int[]	getFromIndicies(int a_index) Return the From clause indicies for the specified expression.
void	readExternal(ObjectInput input) Reads the non-transient fields of this class from an external source.
private boolean	readOldVersion(ObjectInput input, long readSerialVersionUID, boolean passThrough, boolean superDone) Reads the non-transient fields of this class from an external source, which is not the current version.
protected boolean	readVersion(GroupByClause thisObject, ObjectInput input, long readSerialVersionUID, boolean passThrough, boolean superDone) Reads the non-transient fields of this class from an external source.
void	writeExternal(ObjectOutput output) Writes the non-transient fields of this class to an external source.

Methods inherited from class wt.query.ListClause

clone, getClassAttributeFromIndicies, getClause, getCount, getItems, readVersion, setFromAlias, setItems

Methods inherited from class java.lang.Object

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

Field Detail

RESOURCE

private static final String RESOURCE

See Also:

Constant Field Values

CLASSNAME

private static final String CLASSNAME

serialVersionUID

static final long serialVersionUID

See Also:

Constant Field Values

EXTERNALIZATION_VERSION_UID

public static final long EXTERNALIZATION_VERSION_UID

See Also:

Constant Field Values

OLD_FORMAT_VERSION_UID

protected static final long OLD_FORMAT_VERSION_UID

See Also:

Constant Field Values

OLD_SERIAL_VERSION_UID

protected static final long OLD_SERIAL_VERSION_UID

See Also:

Constant Field Values

Constructor Detail

GroupByClause

public GroupByClause()

Method Detail

writeExternal

public void writeExternal(ObjectOutput output)
                   throws IOException

Writes the non-transient fields of this class to an external source.

Supported API: false

Specified by:

writeExternal in interface Externalizable

Overrides:

writeExternal in class ListClause

Parameters:

output -

Throws:

IOException

readExternal

public void readExternal(ObjectInput input)
                  throws IOException,
                         ClassNotFoundException

Reads the non-transient fields of this class from an external source.

Supported API: false

Specified by:

readExternal in interface Externalizable

Overrides:

readExternal in class ListClause

Parameters:

input -

Throws:

IOException

ClassNotFoundException

readVersion

protected boolean readVersion(GroupByClause thisObject,
                              ObjectInput input,
                              long readSerialVersionUID,
                              boolean passThrough,
                              boolean superDone)
                       throws IOException,
                              ClassNotFoundException

Reads the non-transient fields of this class from an external source.

Supported API: false

Parameters:

thisObject -

input -

readSerialVersionUID -

passThrough -

superDone -

Returns:

boolean

Throws:

IOException

ClassNotFoundException

readOldVersion

private boolean readOldVersion(ObjectInput input,
                               long readSerialVersionUID,
                               boolean passThrough,
                               boolean superDone)
                        throws IOException,
                               ClassNotFoundException

Reads the non-transient fields of this class from an external source, which is not the current version.

Parameters:

input -

readSerialVersionUID -

passThrough -

superDone -

Returns:

boolean

Throws:

IOException

ClassNotFoundException

append

public void append(ColumnExpression a_groupBy,
                   int[] a_fromIndicies,
                   FromClause a_fromClause)
            throws QueryException

Appends the ColumnExpression to the clause.

Supported API: false

Parameters:

a_groupBy - ColumnExpression object to append to the clause

a_fromIndicies - Indicies into the FromClause for the TableExpression corresponding to the ColumnExpression to append.

a_fromClause -

Throws:

QueryException

getFromIndicies

protected int[] getFromIndicies(int a_index)

Return the From clause indicies for the specified expression.

Supported API: false

Specified by:

getFromIndicies in class ListClause

Parameters:

a_index -

Returns:

int[]

getColumnExpression

protected ColumnExpression getColumnExpression(int a_index)

Supported API: false

Specified by:

getColumnExpression in class ListClause

Parameters:

a_index -

Returns:

ColumnExpression

getExpression

protected String getExpression(int a_index,
                               Vector a_tableInfos,
                               Vector a_aliases)
                        throws QueryException

Supported API: false

Specified by:

getExpression in class ListClause

Parameters:

a_index -

a_tableInfos -

a_aliases -

Returns:

String

Throws:

QueryException

clone

public Object clone()

Returns a deep copy of this object.

Returns:

Object