net.sf.mmm.util.query.base.expression

Class SingleExpression<L,R>

java.lang.Object

net.sf.mmm.util.query.base.expression.SingleExpression<L,R>

Type Parameters:

L - the generic type of the left hand.

R - the generic type of the right hand.

All Implemented Interfaces:

Expression

public class SingleExpression<L,R>
extends Object
implements Expression

This is the implementation of Expression for a single operation on given arguments.

Since:

8.0.0

Author:

hohwille

Field Summary

Fields

Modifier and Type	Field and Description
private Argument<L>	arg1
private Argument<R>	arg2
private SqlOperator<? super L,? super R>	operator

Constructor Summary

Constructors

Modifier	Constructor and Description
private	SingleExpression(Argument<L> arg1, SqlOperator<? super L,? super R> operator, Argument<R> arg2) The constructor.

Method Summary

Modifier and Type	Method and Description
Expression	combine(Conjunction conjunction, Collection<Expression> expressions)
boolean	evaluate()
void	format(ExpressionFormatter formatter, Bracketing bracketing)
Argument<L>	getArg1()
Argument<R>	getArg2()
SqlOperator<? super L,? super R>	getOperator()
boolean	isConstant()
Expression	negate()
static <L,R> Expression	valueOf(Argument<L> arg1, SqlOperator<? super L,? super R> operator, Argument<R> arg2)

Methods inherited from class java.lang.Object

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

Methods inherited from interface net.sf.mmm.util.query.api.expression.Expression

and, combine, or

Field Detail

arg1

private final Argument<L> arg1

arg2

private final Argument<R> arg2

operator

private final SqlOperator<? super L,? super R> operator

Constructor Detail

SingleExpression

private SingleExpression(Argument<L> arg1,
                         SqlOperator<? super L,? super R> operator,
                         Argument<R> arg2)

The constructor.

Parameters:

arg1 - - see getArg1().

operator - - see getOperator().

arg2 - - see getArg2().

Method Detail

negate

public Expression negate()

Specified by:

negate in interface Expression

Returns:

the negation of this Expression.

getArg1

public Argument<L> getArg1()

Returns:

the first argument (left hand).

getOperator

public SqlOperator<? super L,? super R> getOperator()

Returns:

the SqlOperator.

getArg2

public Argument<R> getArg2()

Returns:

the second argument (right hand).

evaluate

public boolean evaluate()

Specified by:

evaluate in interface Expression

Returns:

true if the expression is fulfilled, false otherwise.

See Also:

Predicate.test(Object)

combine

public Expression combine(Conjunction conjunction,
                          Collection<Expression> expressions)

Specified by:

combine in interface Expression

Parameters:

conjunction - the Conjunction.

expressions - the Collection of the Expressions to combine with this one.

Returns:

a new Expression combining this Expression with the given Expressions using the given Conjunction.

isConstant

public boolean isConstant()

Specified by:

isConstant in interface Expression

Returns:

true if this is a constant expression that evaluates to a fixed result, false otherwise.

valueOf

public static <L,R> Expression valueOf(Argument<L> arg1,
                                       SqlOperator<? super L,? super R> operator,
                                       Argument<R> arg2)

Type Parameters:

L - the generic type of the left hand.

R - the generic type of the right hand.

Parameters:

arg1 - - see getArg1().

operator - - see getOperator().

arg2 - - see getArg2().

Returns:

a new Expression for a single operation on given arguments. Will be reduced to a ConstantExpression if both ConstantArguments are constant and therefore does not have to be an instance of SingleExpression.

format

public void format(ExpressionFormatter formatter,
                   Bracketing bracketing)

Specified by:

format in interface Expression

Parameters:

formatter - the ExpressionFormatter where to append this Expression.

bracketing - the Bracketing.