com.j_spaces.jdbc.parser

Class IsNullNode

java.lang.Object

com.j_spaces.jdbc.parser.ExpNode

com.j_spaces.jdbc.parser.IsNullNode

All Implemented Interfaces:

Externalizable, Serializable, Cloneable

public class IsNullNode
extends ExpNode

This is the IS NULL operator Node. it can also represent an IS NOT NULL

Author:

Michael Mitrani, 2Train4, 2004

See Also:

Serialized Form

Field Summary

Fields inherited from class com.j_spaces.jdbc.parser.ExpNode

leftChild, rightChild, template

Constructor Summary

Constructors

Constructor and Description
IsNullNode()
IsNullNode(ExpNode leftChild, ExpNode rightChild)

Method Summary

Modifier and Type	Method and Description
void	accept(QueryTemplateBuilder builder) Accept the query builder Default implementation returns null - no QueryTemplatePacket is defined
boolean	isJoined() is there somewhere in the tree a join condition.
boolean	isValidCompare(Object ob1, Object ob2) Operator nodes implement this method to return whether two objects satisfy the given condition.
ExpNode	newInstance() Prototype method - Create new instance of the class
void	readExternal(ObjectInput in)
void	setNot(boolean isNot)
String	toString()
void	writeExternal(ObjectOutput out)

Methods inherited from class com.j_spaces.jdbc.parser.ExpNode

accept, clone, createIndex, createJoinIndex, forEachChild, getLeftChild, getRightChild, getTemplate, isContainsItemNode, isContainsItemsRootNode, isInnerQuery, prepareTemplateValues, prepareValues, reverse, setLeftChild, setRightChild, setTemplate, toString, traverse, traverseReverse, validateInnerQueryResult

Methods inherited from class java.lang.Object

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

Constructor Detail

IsNullNode

public IsNullNode(ExpNode leftChild,
                  ExpNode rightChild)

IsNullNode

public IsNullNode()

Method Detail

isValidCompare

public boolean isValidCompare(Object ob1,
                              Object ob2)

Description copied from class: ExpNode

Operator nodes implement this method to return whether two objects satisfy the given condition.

Specified by:

isValidCompare in class ExpNode

Returns:

true if the two given objects satisfy the condition

setNot

public void setNot(boolean isNot)

Parameters:

isNot - if true, this is a IS NOT NULL. otherwise it's IS NULL

isJoined

public boolean isJoined()

Description copied from class: ExpNode

is there somewhere in the tree a join condition.

Overrides:

isJoined in class ExpNode

newInstance

public ExpNode newInstance()

Description copied from class: ExpNode

Prototype method - Create new instance of the class

Specified by:

newInstance in class ExpNode

accept

public void accept(QueryTemplateBuilder builder)
            throws SQLException

Description copied from class: ExpNode

Accept the query builder Default implementation returns null - no QueryTemplatePacket is defined

Specified by:

accept in class ExpNode

Throws:

SQLException

toString

public String toString()

Overrides:

toString in class Object

writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException

Specified by:

writeExternal in interface Externalizable

Overrides:

writeExternal in class ExpNode

Throws:

IOException

readExternal

public void readExternal(ObjectInput in)
                  throws IOException,
                         ClassNotFoundException

Specified by:

readExternal in interface Externalizable

Overrides:

readExternal in class ExpNode

Throws:

IOException

ClassNotFoundException