com.metamatrix.query.sql.proc
Class AssignmentStatement

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

All Implemented Interfaces:

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

Direct Known Subclasses:

DeclareStatement, RaiseErrorStatement

public class AssignmentStatement
extends Statement
implements SubqueryContainer

This class represents an assignment statement in the storedprocedure language. It extends the Statement that could part of a Block. This statement holds references to the variable and it's value which could be an Expression or a Command.

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

AssignmentStatement()
Constructor for AssignmentStatement.

AssignmentStatement(ElementSymbol variable, LanguageObject value)

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 AssignmentStatements for equality.
Command	getCommand() Returns the subquery Command object
Expression	getExpression()
int	getType() Return the type for this statement, this is one of the types defined on the statement object.
LanguageObject	getValue()
ElementSymbol	getVariable() Get the expression giving the value that is assigned to the variable.
boolean	hasCommand()
boolean	hasExpression()
int	hashCode() Get hashcode for AssignmentStatement.
void	setCommand(Command command) Sets the subquery Command object
void	setExpression(Expression expression)
void	setValue(LanguageObject value)
void	setVariable(ElementSymbol variable) Set the variable that is assigned to the value
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

AssignmentStatement

public AssignmentStatement()

Constructor for AssignmentStatement.

AssignmentStatement

public AssignmentStatement(ElementSymbol variable,
                           LanguageObject value)

Method Detail

hasCommand

public boolean hasCommand()

getCommand

public Command getCommand()

Description copied from interface: SubqueryContainer

Returns the subquery Command object

Specified by:

getCommand in interface SubqueryContainer

Returns:

the subquery Command object

setCommand

public void setCommand(Command command)

Description copied from interface: SubqueryContainer

Sets the subquery Command object

Specified by:

setCommand in interface SubqueryContainer

Parameters:

command - the subquery Command object

hasExpression

public boolean hasExpression()

getExpression

public Expression getExpression()

setExpression

public void setExpression(Expression expression)

getValue

public LanguageObject getValue()

setValue

public void setValue(LanguageObject value)

getVariable

public ElementSymbol getVariable()

Get the expression giving the value that is assigned to the variable.

Returns:

An Expression with the value

setVariable

public void setVariable(ElementSymbol variable)

Set the variable that is assigned to the value

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 type of this statement

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()

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 AssignmentStatements for equality. They will only evaluate to equal if they are IDENTICAL: variable and its value which could be a command or an expression objects are equal.

Overrides:

equals in class java.lang.Object

Parameters:

obj - Other object

Returns:

True if equal

hashCode

public int hashCode()

Get hashcode for AssignmentStatement. WARNING: This hash code relies on the hash codes of the variable and its value which could be a command or an expression.

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