| /******************************************************************************* |
| * Copyright (c) 2009 Cloudsmith Inc. and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * Cloudsmith Inc. - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.equinox.internal.p2.ql.expression; |
| |
| import org.eclipse.equinox.p2.ql.IEvaluationContext; |
| |
| /** |
| * An expression that yields <code>true</code> when its operand does not. |
| */ |
| final class Not extends Unary { |
| Not(Expression operand) { |
| super(operand); |
| } |
| |
| public Object evaluate(IEvaluationContext context) { |
| return Boolean.valueOf(operand.evaluate(context) != Boolean.TRUE); |
| } |
| |
| public int getExpressionType() { |
| return TYPE_NOT; |
| } |
| |
| String getOperator() { |
| return OPERATOR_NOT; |
| } |
| |
| int getPriority() { |
| return PRIORITY_NOT; |
| } |
| |
| boolean isBoolean() { |
| return true; |
| } |
| } |