/*
* Kodkod -- Copyright (c) 2005-present, Emina Torlak
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package kodkod.ast;
import kodkod.ast.operator.IntOperator;
import kodkod.ast.visitor.ReturnVisitor;
import kodkod.ast.visitor.VoidVisitor;
/**
* A unary integer intExpr, e.g. -x.
* @specfield intExpr: IntExpression
* @specfield op: IntOperator
* @invariant op.unary()
* @invariant children = 0->intExpr
* @author Emina Torlak
*/
public final class UnaryIntExpression extends IntExpression {
private final IntOperator op;
private final IntExpression intExpr;
/**
* Constructs a new unary int formula: op intExpr
* @ensures this.op' = op && this.intExpr' = intExpr
*/
UnaryIntExpression(IntOperator op, IntExpression intExpr) {
if (!op.unary()) throw new IllegalArgumentException("Not a unary operator: " + op);
this.op = op;
this.intExpr = intExpr;
}
/**
* Returns the operator of this.
* @return this.op
*/
public IntOperator op() {return op;}
/**
* Returns this.intExpr.
* @return this.intExpr
*/
public IntExpression intExpr() {return intExpr;}
/**
* {@inheritDoc}
* @see kodkod.ast.IntExpression#accept(kodkod.ast.visitor.ReturnVisitor)
*/
@Override
public <E, F, D, I> I accept(ReturnVisitor<E, F, D, I> visitor) {
return visitor.visit(this);
}
/**
* {@inheritDoc}
* @see kodkod.ast.IntExpression#accept(kodkod.ast.visitor.VoidVisitor)
*/
@Override
public void accept(VoidVisitor visitor) {
visitor.visit(this);
}
/**
* {@inheritDoc}
* @see kodkod.ast.Node#toString()
*/
public String toString() {
return (op==IntOperator.NEG||op==IntOperator.NOT) ? "(" + op + intExpr + ")" : op + "(" + intExpr + ")" ;
}
}