com.mapr.ojai.store.impl

Class UnaryOperator

java.lang.Object

com.mapr.ojai.store.impl.Expression

com.mapr.ojai.store.impl.OperatorExpression

com.mapr.ojai.store.impl.UnaryOperator

public class UnaryOperator
extends OperatorExpression

Unary operator in a query expression tree.

Field Summary

Fields inherited from class com.mapr.ojai.store.impl.OperatorExpression

opName

Constructor Summary

Constructors

Constructor and Description
UnaryOperator(java.lang.String opName, Expression operand) Constructor.

Method Summary

Modifier and Type	Method and Description
void	emitSql(java.lang.StringBuilder sb, java.lang.String tableAlias) Emit this expression's contribution to the string (where clause).
Expression	getOperand() Get the operand.
boolean	structuralEquals(Expression e) Check to see if the two expressions are equal.
int	structuralHashCode() Generate the hash code for the Expression.
void	visit(ExpressionVisitor ev) Visit this node.

Methods inherited from class com.mapr.ojai.store.impl.Expression

gatherExpressions, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

UnaryOperator

public UnaryOperator(java.lang.String opName,
                     Expression operand)

Constructor.

Parameters:

opName - the string name of the operator

operand - the operand

Method Detail

getOperand

public Expression getOperand()

Get the operand.

Returns:

the operand

emitSql

public void emitSql(java.lang.StringBuilder sb,
                    java.lang.String tableAlias)

Description copied from class: Expression

Emit this expression's contribution to the string (where clause).

Specified by:

emitSql in class Expression

Parameters:

sb - where to write to

tableAlias - the table alias to use for field names

structuralEquals

public boolean structuralEquals(Expression e)

Description copied from class: Expression

Check to see if the two expressions are equal. Two expressions are considered equal if they have the same shape, fields, and operators, but the literal values do not need to match.

Specified by:

structuralEquals in class Expression

Parameters:

e - the other expression to compare with

structuralHashCode

public int structuralHashCode()

Description copied from class: Expression

Generate the hash code for the Expression. Note that hashCodes do not depend on the values of literals; this is to aid in finding queries that are the same except for their constants (which could be replaced with bind variables, if they were supported).

Specified by:

structuralHashCode in class Expression

Returns:

the hash code

visit

public void visit(ExpressionVisitor ev)

Description copied from class: Expression

Visit this node. For nodes that have children, this will be expected to visit those in post-order.

Specified by:

visit in class Expression

Parameters:

ev - the visitor