wt.query
Class SubSelectExpression

java.lang.Object
  wt.query.AbstractSubSelectTableExpression
      wt.query.SubSelectExpression

All Implemented Interfaces:

Cloneable, Expression, Externalizable, RelationalExpression, Serializable, TableExpression

public class SubSelectExpression

extends AbstractSubSelectTableExpression

implements RelationalExpression, Externalizable

This class represents a subselect which can be used in a SQL statement. The subselect is specifed via a StatementSpec attribute.

Supported API: true

Extendable: false

See Also:

Serialized Form

Field Summary

private static String	CLASSNAME
static boolean	DEBUG
static long	EXTERNALIZATION_VERSION_UID
private static DebugWriter	LOG
protected static long	OLD_FORMAT_VERSION_UID
private static String	RESOURCE
(package private) static long	serialVersionUID

Fields inherited from class wt.query.AbstractSubSelectTableExpression

Fields inherited from interface wt.query.RelationalExpression

BIND_PARAMETER

Fields inherited from interface wt.query.Expression

FROM_COUNT

Fields inherited from interface wt.query.TableExpression

ACCESS_CONTROL_REQUIRED, ADVANCED_QUERY, ADVANCED_QUERY_ENABLED, BIND_PARAMETER, DESCENDANTS_INCLUDED, TABLE_CLASS

Constructor Summary

SubSelectExpression()


Supported API: false

SubSelectExpression(StatementSpec a_subSelect)


Supported API: true

Method Summary

Object	getBindParameter() Gets the value of the attribute: bindParameter; Returns a bind parameter for this expression (if supported).
List	getClassAttributes() Supported API: false
List	getCorrelatedClassAttributes() Gets the value of the attribute: correlatedClassAttributes.
String	getExpression(boolean a_useBind, Vector a_tableInfos, Vector a_aliases, boolean a_outerJoin) Return string representation of this expression.
int	getFromCount() Gets the value of the attribute: fromCount; Number of from index values that this expression requires Supported API: false
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(SubSelectExpression thisObject, ObjectInput input, long readSerialVersionUID, boolean passThrough, boolean superDone) Reads the non-transient fields of this class from an external source.
int	setFromAlias(String[] a_aliases, int a_offset) This method sets the FROM clause alias for this expression.
int	validate(TableExpression[] a_tableExpressions, int a_offset) This method validates this expression against the specified table expression.
void	writeExternal(ObjectOutput output) Writes the non-transient fields of this class to an external source.

Methods inherited from class wt.query.AbstractSubSelectTableExpression

appendClassAttribute, clone, columnsReset, getColumnAccessItemBuilder, getDMLGenerator, getExpression, getJoinCondition, getJoinCondition, getSubSelect, getTableClass, getTables, getValidClasses, isAccessControlled, isAccessControlRequired, isAdvancedQuery, isAdvancedQueryEnabled, isAutoNavigate, isDescendantsIncluded, isUseViewTableAlias, readVersion, setAccessControlRequired, setAdvancedQueryEnabled, setDescendantsIncluded, setSubSelect, toString

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, 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

DEBUG

public static final boolean DEBUG

LOG

private static final DebugWriter LOG

Constructor Detail

SubSelectExpression

public SubSelectExpression()

Supported API: false

SubSelectExpression

public SubSelectExpression(StatementSpec a_subSelect)

Supported API: true

Parameters:

a_subSelect - Specifies the StatementSpec instance for this sub-select.

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 AbstractSubSelectTableExpression

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 AbstractSubSelectTableExpression

Parameters:

input -

Throws:

IOException

ClassNotFoundException

readVersion

protected boolean readVersion(SubSelectExpression 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

getCorrelatedClassAttributes

public List getCorrelatedClassAttributes()

Gets the value of the attribute: correlatedClassAttributes.

Supported API: false

Returns:

List

getBindParameter

public Object getBindParameter()
                        throws WTException

Gets the value of the attribute: bindParameter; Returns a bind parameter for this expression (if supported).

Supported API: false

Specified by:

getBindParameter in interface RelationalExpression

Overrides:

getBindParameter in class AbstractSubSelectTableExpression

Returns:

Object

Throws:

WTException

getExpression

public String getExpression(boolean a_useBind,
                            Vector a_tableInfos,
                            Vector a_aliases,
                            boolean a_outerJoin)
                     throws QueryException

Return string representation of this expression.

Supported API: false

Specified by:

getExpression in interface RelationalExpression

Parameters:

a_useBind - Indicates that bind variables should be used for this expression.

a_tableInfos -

a_aliases -

a_outerJoin - Indicates that outer join syntax should be used for this expression.

Returns:

String

Throws:

QueryException

getClassAttributes

public List getClassAttributes()

Supported API: false

Specified by:

getClassAttributes in interface RelationalExpression

Returns:

List

getFromCount

public int getFromCount()

Gets the value of the attribute: fromCount; Number of from index values that this expression requires

Supported API: false

Specified by:

getFromCount in interface Expression

Returns:

int

validate

public int validate(TableExpression[] a_tableExpressions,
                    int a_offset)
             throws QueryException

This method validates this expression against the specified table expression. A QueryException is thrown if this expression is not valid.

Supported API: false

Specified by:

validate in interface Expression

Parameters:

a_tableExpressions - Table expression to validate against.

a_offset - Offset index into the TableExpression array for the next valid TableExpression

Returns:

number of TableExpressions validated

Throws:

QueryException

setFromAlias

public int setFromAlias(String[] a_aliases,
                        int a_offset)

This method sets the FROM clause alias for this expression. This alias is used in this Expression in place of the corresponding TableExpression.

Supported API: false

Specified by:

setFromAlias in interface Expression

Parameters:

a_aliases - Array of aliases for expressions

a_offset - Offset index into the alias array for the next valid alias

Returns:

number of aliases used