com.metamatrix.query.sql.proc
Class IfStatement

java.lang.Object
  com.metamatrix.query.sql.proc.Statement
      com.metamatrix.query.sql.proc.IfStatement

All Implemented Interfaces:

LanguageObject, java.io.Serializable, java.lang.Cloneable

public class IfStatement
extends Statement

This class represents an if-else statement in the storedprocedure language. It extends the Statement that could part of a block. This statement has an IF block and an optional ELSE block, it also holds reference to the criteria that determines which block should be executed..

See Also:

Serialized Form

Field Summary

Fields inherited from class com.metamatrix.query.sql.proc.Statement

TYPE_ASSIGNMENT, TYPE_BREAK, TYPE_COMMAND, TYPE_CONTINUE, TYPE_DECLARE, TYPE_ERROR, TYPE_IF, TYPE_LOOP, TYPE_UNKNOWN, TYPE_WHILE

Constructor Summary

IfStatement()
Constructor for IfStatement.

IfStatement(Criteria criteria, Block ifBlock)
Constructor for IfStatement.

IfStatement(Criteria criteria, Block ifBlock, Block elseBlock)
Constructor for IfStatement.

Method Summary

void	acceptVisitor(LanguageVisitor visitor) Method for accepting a visitor.
java.lang.Object	clone() Deep clone statement to produce a new identical statement.
boolean	equals(java.lang.Object obj) Compare two IfStatements for equality.
Criteria	getCondition() Get the condition that determines which block needs to be executed.
Block	getElseBlock() Get the statement's ELSE block.
Block	getIfBlock() Get the statement's IF block.
int	getType() Return the type for this statement, this is one of the types defined on the statement object.
boolean	hasElseBlock() Return a boolean indicating if the statement has an else block.
int	hashCode() Get hashcode for IfStatement.
void	setCondition(Criteria criteria) Set the condition that determines which block needs to be executed.
void	setElseBlock(Block block) Set the statement's ELSE block.
void	setIfBlock(Block block) Set the statement's IF block.
java.lang.String	toString() Returns a string representation of an instance of this class.

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

IfStatement

public IfStatement()

Constructor for IfStatement.

IfStatement

public IfStatement(Criteria criteria,
                   Block ifBlock,
                   Block elseBlock)

Constructor for IfStatement.

Parameters:

criteria - The criteria determining which bleck should be executed

ifBlock - The IF Block object.

ifBlock - The ELSE Block object.

IfStatement

public IfStatement(Criteria criteria,
                   Block ifBlock)

Constructor for IfStatement.

Parameters:

criteria - The criteria determining which bleck should be executed

ifBlock - The IF Block object.

Method Detail

getIfBlock

public Block getIfBlock()

Get the statement's IF block.

Returns:

The IF Block object.

setIfBlock

public void setIfBlock(Block block)

Set the statement's IF block.

Parameters:

block - The IF Block object.

getElseBlock

public Block getElseBlock()

Get the statement's ELSE block.

Returns:

The ELSE Block object.

setElseBlock

public void setElseBlock(Block block)

Set the statement's ELSE block.

Parameters:

block - The ELSE Block object.

hasElseBlock

public boolean hasElseBlock()

Return a boolean indicating if the statement has an else block.

Returns:

A boolean indicating if the statement has an else block

getCondition

public Criteria getCondition()

Get the condition that determines which block needs to be executed.

Returns:

The Criteria to determine block execution

setCondition

public void setCondition(Criteria criteria)

Set the condition that determines which block needs to be executed.

Parameters:

criteria - The Criteria to determine block execution

getType

public int getType()

Return the type for this statement, this is one of the types defined on the statement object.

Specified by:

getType in class Statement

Returns:

The statement type

acceptVisitor

public void acceptVisitor(LanguageVisitor visitor)

Description copied from interface: LanguageObject

Method for accepting a visitor. It is the responsibility of the language object to call back on the visitor.

Parameters:

visitor - Visitor being used

clone

public java.lang.Object clone()

Deep clone statement to produce a new identical statement.

Specified by:

clone in interface LanguageObject

Specified by:

clone in class Statement

Returns:

Deep clone

equals

public boolean equals(java.lang.Object obj)

Compare two IfStatements for equality. They will only evaluate to equal if they are IDENTICAL: their if, else blocks are same and the condition on the ifBlock is same.

Overrides:

equals in class java.lang.Object

Parameters:

obj - Other object

Returns:

True if equal

hashCode

public int hashCode()

Get hashcode for IfStatement. WARNING: This hash code relies on the hash codes of the if-else blocks anf the criteria determining the block on this statement. Hash code is only valid after the block has been completely constructed.

Overrides:

hashCode in class java.lang.Object

Returns:

Hash code

toString

public java.lang.String toString()

Returns a string representation of an instance of this class.

Overrides:

toString in class java.lang.Object

Returns:

String representation of object