org.axiondb

Class FromNode

public class FromNode extends Object

A binary tree of tables (or "table like" objects) being selected from. Each element in the tree is either a FromNode or a TableIdentifier or a sub-query.

Version: $Revision: 1.12 $ $Date: 2005/04/01 01:35:26 $

Author: Amrish Lal

Field Summary
static int	TYPE_INNER Inner join.
static int	TYPE_LEFT Left outer join
static int	TYPE_RIGHT Right outer join
static int	TYPE_SINGLE No Join

Constructor Summary
	FromNode()

Method Summary
Selectable	getCondition() get the join condition
Object	getLeft() Get the Left input
Object	getRight() get the right input
int	getTableCount() Number of tables in this FromNode and its children.
int	getType() get the type of the join
boolean	hasCondition()
boolean	hasLeft()
boolean	hasRight()
boolean	isInnerJoin()
boolean	isLeftJoin()
boolean	isRightJoin()
void	setCondition(Selectable condition) Set the join condition
void	setLeft(FromNode join)
void	setLeft(Object table)
void	setRight(FromNode join)
void	setRight(Object table)
void	setType(int type) Set the type of join.
String	toString()
TableIdentifier[]	toTableArray() Array of tables in this FromNode or its children.
static String	typeToString(int type)

Field Detail

TYPE_INNER

public static final int TYPE_INNER

Inner join.

TYPE_LEFT

public static final int TYPE_LEFT

Left outer join

TYPE_RIGHT

public static final int TYPE_RIGHT

Right outer join

TYPE_SINGLE

public static final int TYPE_SINGLE

No Join

Constructor Detail

FromNode

public FromNode()

Method Detail

getCondition

public Selectable getCondition()

get the join condition

Returns: join condition.

getLeft

public Object getLeft()

Get the Left input

Returns: Object of type FromNodeor TableIdentifier

getRight

public Object getRight()

get the right input

Returns: Object of type FromNodeor TableIdentifier

getTableCount

public int getTableCount()

Number of tables in this FromNode and its children.

Returns: table count.

getType

public int getType()

get the type of the join

Returns: integer indicating type (UNDEFINED, LEFT OUTER, RIGHT OUTER, INNER)

hasCondition

public boolean hasCondition()

hasLeft

public boolean hasLeft()

hasRight

public boolean hasRight()

isInnerJoin

public boolean isInnerJoin()

isLeftJoin

public boolean isLeftJoin()

isRightJoin

public boolean isRightJoin()

setCondition

public void setCondition(Selectable condition)

Set the join condition

Parameters: type condition Join condition.

setLeft

public void setLeft(FromNode join)

setLeft

public void setLeft(Object table)

setRight

public void setRight(FromNode join)

setRight

public void setRight(Object table)

setType

public void setType(int type)

Set the type of join.

Parameters: type integer value representing join type (INNER, LEFT OUTER, RIGHT OUTER)

toString

public String toString()

toTableArray

public TableIdentifier[] toTableArray()

Array of tables in this FromNode or its children. Array is devleoped by preorder traversal of the FromNode tree.

Returns: Array of TableIdentifier

typeToString

public static String typeToString(int type)