adql.query.from

Class CrossJoin

java.lang.Object

adql.query.from.ADQLJoin

adql.query.from.CrossJoin

All Implemented Interfaces:

ADQLObject, FromContent

public class CrossJoin
extends ADQLJoin

Cross join.

In ADQL "T1, T2" is equivalent to "T1, T2" or to "T1 CROSS JOIN T2" in SQL.

Version:

08/2011

Author:

Grégory Mantelet (CDS)

Field Summary

Fields inherited from class adql.query.from.ADQLJoin

condition, lstColumns, natural

Constructor Summary

Constructors

Constructor and Description
CrossJoin(CrossJoin toCopy) Builds a copy of the given CROSS join.
CrossJoin(FromContent left, FromContent right) Builds a CROSS join between the two given "tables".

Method Summary

Modifier and Type	Method and Description
ADQLObject	getCopy() Gets a (deep) copy of this ADQL object.
java.lang.String	getJoinType() Gets the type of this join.
void	setJoinCondition(ClauseConstraints cond) Effect-less method: no join condition can be specified to make a CROSS join.
void	setJoinedColumns(java.util.Collection<ADQLColumn> columns) Effect-less method: no columns can be joined in a CROSS join.
void	setNatural(boolean natural) Effect-less method: a CROSS join can not be NATURAL.

Methods inherited from class adql.query.from.ADQLJoin

addAllExcept, adqlIterator, findAtMostOneColumn, findExactlyOneColumn, getDBColumns, getJoinCondition, getJoinedColumns, getLeftTable, getName, getPosition, getRightTable, getTables, getTablesByAlias, hasJoinedColumns, isCommonColumn, isNatural, setLeftTable, setPosition, setRightTable, toADQL

Methods inherited from class java.lang.Object

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

Constructor Detail

CrossJoin

public CrossJoin(FromContent left,
                 FromContent right)

Builds a CROSS join between the two given "tables".

Parameters:

left - Left "table".

right - Right "table".

See Also:

ADQLJoin.ADQLJoin(FromContent, FromContent)

CrossJoin

public CrossJoin(CrossJoin toCopy)
          throws java.lang.Exception

Builds a copy of the given CROSS join.

Parameters:

toCopy - The CROSS join to copy.

Throws:

java.lang.Exception - If there is an error during the copy.

See Also:

ADQLJoin.ADQLJoin(ADQLJoin)

Method Detail

getJoinType

public java.lang.String getJoinType()

Description copied from class: ADQLJoin

Gets the type of this join.

Specified by:

getJoinType in class ADQLJoin

Returns:

Its join type (i.e. CROSS JOIN, LEFT JOIN, LEFT OUTER JOIN, ...).

setNatural

public void setNatural(boolean natural)

Effect-less method: a CROSS join can not be NATURAL.

Overrides:

setNatural in class ADQLJoin

Parameters:

natural - true means this join must be natural, false else.

See Also:

ADQLJoin.setNatural(boolean)

setJoinCondition

public void setJoinCondition(ClauseConstraints cond)

Effect-less method: no join condition can be specified to make a CROSS join.

Overrides:

setJoinCondition in class ADQLJoin

Parameters:

cond - The join condition (condition following ON).

See Also:

ADQLJoin.setJoinCondition(adql.query.ClauseConstraints)

setJoinedColumns

public void setJoinedColumns(java.util.Collection<ADQLColumn> columns)

Effect-less method: no columns can be joined in a CROSS join.

Overrides:

setJoinedColumns in class ADQLJoin

Parameters:

columns - The joined columns.

See Also:

ADQLJoin.setJoinedColumns(java.util.Collection)

getCopy

public ADQLObject getCopy()
                   throws java.lang.Exception

Description copied from interface: ADQLObject

Gets a (deep) copy of this ADQL object.

Specified by:

getCopy in interface ADQLObject

Specified by:

getCopy in class ADQLJoin

Returns:

The copy of this ADQL object.

Throws:

java.lang.Exception - If there is any error during the copy.