org.teiid.query.sql.symbol
Class Reference

java.lang.Object
  org.teiid.query.sql.symbol.Reference

All Implemented Interfaces:

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

public class Reference
extends java.lang.Object
implements Expression, ContextReference

This class represents a reference (positional from the user query, or to an element from another scope). This reference may resolve to many different values during evaluation. For any particular bound value, it is treated as a constant.

See Also:

Serialized Form

Nested Class Summary

static interface

Reference.Constraint

Nested classes/interfaces inherited from interface org.teiid.query.sql.LanguageObject

LanguageObject.Util

Constructor Summary

Reference(ElementSymbol expression)
Constructor for an element Reference.

Reference(int refIndex)
Constructor for a positional Reference.

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) Compare this constant to another constant for equality.
Reference.Constraint	getConstraint()
java.lang.String	getContextSymbol()
ElementSymbol	getExpression()
int	getIndex()
java.lang.Class<?>	getType() Get the return type of this expression.
Expression	getValueExpression()
int	hashCode() Define hash code to be that of the underlying object to make it stable.
boolean	isCorrelated()
boolean	isPositional()
boolean	isResolved() Return true if expression has been fully resolved.
void	setConstraint(Reference.Constraint constraint)
void	setExpression(ElementSymbol expression) Should never be called - used for an xml hack
void	setType(java.lang.Class<?> type)
java.lang.String	toString() Return a String representation of this object using SQLStringVisitor.

Methods inherited from class java.lang.Object

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

Constructor Detail

Reference

public Reference(int refIndex)

Constructor for a positional Reference.

Reference

public Reference(ElementSymbol expression)

Constructor for an element Reference.

Method Detail

getConstraint

public Reference.Constraint getConstraint()

setConstraint

public void setConstraint(Reference.Constraint constraint)

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.

Specified by:

isResolved in interface Expression

Returns:

True if resolved

getIndex

public int getIndex()

getContextSymbol

public java.lang.String getContextSymbol()

Specified by:

getContextSymbol in interface ContextReference

getValueExpression

public Expression getValueExpression()

Specified by:

getValueExpression in interface ContextReference

getExpression

public ElementSymbol getExpression()

getType

public java.lang.Class<?> getType()

Description copied from interface: Expression

Get the return type of this expression. This method will not necessarily work right before resolution (Expression.isResolved() returns true).

Specified by:

getType in interface Expression

Returns:

Java class name

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.

Specified by:

acceptVisitor in interface LanguageObject

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

Overrides:

clone in class java.lang.Object

Returns:

Deep clone of this object

See Also:

Object.clone()

equals

public boolean equals(java.lang.Object obj)

Compare this constant to another constant for equality.

Overrides:

equals in class java.lang.Object

Parameters:

obj - Other object

Returns:

True if constants are equal

setType

public void setType(java.lang.Class<?> type)

hashCode

public int hashCode()

Define hash code to be that of the underlying object to make it stable.

Overrides:

hashCode in class java.lang.Object

Returns:

Hash code, based on value

toString

public java.lang.String toString()

Return a String representation of this object using SQLStringVisitor.

Overrides:

toString in class java.lang.Object

Returns:

String representation using SQLStringVisitor

isCorrelated

public boolean isCorrelated()

isPositional

public boolean isPositional()

setExpression

public void setExpression(ElementSymbol expression)

Should never be called - used for an xml hack

Parameters:

expression -