com.metamatrix.query.sql.symbol
Class CaseExpression

java.lang.Object
  com.metamatrix.query.sql.symbol.AbstractCaseExpression
      com.metamatrix.query.sql.symbol.CaseExpression

All Implemented Interfaces:

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

public class CaseExpression
extends AbstractCaseExpression

See Also:

Serialized Form

Constructor Summary

CaseExpression(Expression expression, java.util.List when, java.util.List then)
Constructor for CaseExpression objects

Method Summary

void	acceptVisitor(LanguageVisitor visitor) Method for accepting a visitor.
java.lang.Object	clone() Implement clone to make objects cloneable.
boolean	equals(java.lang.Object obj)
Expression	getExpression() Gets the expression whose evaluation is being tested in this case expression.
java.util.List	getWhen() Gets the List of Expressions in the WHEN parts of this expression.
int	getWhenCount() Gets the number of WHEN and THEN parts this case expression contains.
Expression	getWhenExpression(int index) Gets the WHEN expression at the given 0-based index.
boolean	isResolved() Return true if expression has been fully resolved.
void	setExpression(Expression expr) Sets the expression for this case expression
void	setWhen(java.util.List when, java.util.List then) Sets the WHEN and THEN parts of this CASE expression.

Methods inherited from class com.metamatrix.query.sql.symbol.AbstractCaseExpression

getElseExpression, getThen, getThenExpression, getType, hashCode, setElseExpression, setThen, setType, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

CaseExpression

public CaseExpression(Expression expression,
                      java.util.List when,
                      java.util.List then)

Constructor for CaseExpression objects

Parameters:

expression - a non-null expression

when - a non-null List containing at least one Expression

then - a non-null List containing at least one Expression

Method Detail

getExpression

public Expression getExpression()

Gets the expression whose evaluation is being tested in this case expression.

Returns:

setExpression

public void setExpression(Expression expr)

Sets the expression for this case expression

Parameters:

expr - a non-null Expression

getWhenCount

public int getWhenCount()

Description copied from class: AbstractCaseExpression

Gets the number of WHEN and THEN parts this case expression contains. This number is always >= 1.

Specified by:

getWhenCount in class AbstractCaseExpression

Returns:

See Also:

AbstractCaseExpression.getWhenCount()

getWhen

public java.util.List getWhen()

Gets the List of Expressions in the WHEN parts of this expression. Never null.

Returns:

getWhenExpression

public Expression getWhenExpression(int index)

Gets the WHEN expression at the given 0-based index.

Parameters:

index -

Returns:

setWhen

public void setWhen(java.util.List when,
                    java.util.List then)

Sets the WHEN and THEN parts of this CASE expression. Both lists should have the same number of Expressions.

Specified by:

setWhen in class AbstractCaseExpression

Parameters:

when - a non-null List of at least one Expression

then - a non-null List of at least one Expression

isResolved

public boolean isResolved()

Description copied from interface: Expression

Return true if expression has been fully resolved. Typically the QueryResolver component will handle resolution of an expression.

Returns:

True if resolved

See Also:

Expression.isResolved()

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()

Description copied from interface: LanguageObject

Implement clone to make objects cloneable.

Specified by:

clone in interface LanguageObject

Specified by:

clone in class AbstractCaseExpression

Returns:

Deep clone of this object

See Also:

Object.clone()

equals

public boolean equals(java.lang.Object obj)

Overrides:

equals in class AbstractCaseExpression