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/*******************************************************************************
* Copyright (c) 2009, 2017 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.metadata.expression;
import org.eclipse.equinox.p2.metadata.expression.IEvaluationContext;
/**
* An expression that yields <code>true</code> when its operand does not.
*/
final class Not extends Unary {
Not(Expression operand) {
super(operand);
}
@Override
public Object evaluate(IEvaluationContext context) {
return Boolean.valueOf(operand.evaluate(context) != Boolean.TRUE);
}
@Override
public int getExpressionType() {
return TYPE_NOT;
}
@Override
public String getOperator() {
return OPERATOR_NOT;
}
@Override
public int getPriority() {
return PRIORITY_NOT;
}
@Override
public int hashCode() {
return 3 * operand.hashCode();
}
@Override
public void toLDAPString(StringBuffer buf) {
buf.append("(!"); //$NON-NLS-1$
operand.toLDAPString(buf);
buf.append(')');
}
}
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