Package com.e1c.langtool.history.db.query

Class Operation

java.lang.Object

com.e1c.langtool.history.db.query.Operation

All Implemented Interfaces:

IExpression, IOperation

public final class Operation
extends Object
implements IOperation

Immutable and thread-safe implementation of IOperation.

Note that this class overrides equals(Object) with implementation which recursively compares all child for equality. As opposed to @equals method hashCode() calculates hashes only for self and both left and right expressions.

It's highly recommended to use special builders like ExpressionBuilder to create expressions based on operations.

See Also:

• ExpressionBuilder

Nested Class Summary

Nested classes/interfaces inherited from interface com.e1c.langtool.history.db.query.IOperation

IOperation.BoolOp

Constructor Summary

Constructors

Constructor	Description
Operation(IExpression left, IOperation.BoolOp op, IExpression right)

Method Summary

Modifier and Type	Method	Description
void	accept(IExpressionVisitor visitor)	Accepts the given expression visitor.
boolean	equals(Object obj)
Optional<IExpression>	getLeft()	Returns the left sub-expression of this operation tree node.
IOperation.BoolOp	getOperator()	Returns the logical operator applicable to the expressions.
Optional<IExpression>	getRight()	Returns the right sub-expression of this operation tree node.
int	hashCode()

Methods inherited from class java.lang.Object

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

Constructor Details

Operation

public Operation(IExpression left,
 IOperation.BoolOp op,
 IExpression right)

Method Details

accept

public void accept(IExpressionVisitor visitor)

Description copied from interface: IExpression

Accepts the given expression visitor.

The visitor's visit method is called with this expression.

Specified by:

accept in interface IExpression

Parameters:

visitor - the visitor

getLeft

public Optional<IExpression> getLeft()

Description copied from interface: IOperation

Returns the left sub-expression of this operation tree node.

Specified by:

getLeft in interface IOperation

Returns:

the left expression

getRight

public Optional<IExpression> getRight()

Description copied from interface: IOperation

Returns the right sub-expression of this operation tree node.

Specified by:

getRight in interface IOperation

Returns:

the right expression

getOperator

public IOperation.BoolOp getOperator()

Description copied from interface: IOperation

Returns the logical operator applicable to the expressions.

Specified by:

getOperator in interface IOperation

Returns:

the logical operator

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object