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/*******************************************************************************
* Copyright (c) 2009, 2010 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;
import org.eclipse.equinox.p2.metadata.expression.IExpressionVisitor;
/**
* The abstract base class for all unary expressions
*/
public abstract class Unary extends Expression {
public final Expression operand;
protected Unary(Expression operand) {
this.operand = operand;
}
public boolean accept(IExpressionVisitor visitor) {
return super.accept(visitor) && operand.accept(visitor);
}
public int compareTo(Expression e) {
int cmp = super.compareTo(e);
if (cmp == 0)
cmp = operand.compareTo(((Unary) e).operand);
return cmp;
}
public boolean equals(Object o) {
return super.equals(o) && operand.equals(((Unary) o).operand);
}
public Object evaluate(IEvaluationContext context) {
return operand.evaluate(context);
}
public int hashCode() {
return operand.hashCode() * 3 + operand.getExpressionType();
}
public Expression getOperand() {
return operand;
}
public void toString(StringBuffer bld, Variable rootVariable) {
bld.append(getOperator());
appendOperand(bld, rootVariable, operand, getPriority());
}
int countAccessToEverything() {
return operand.countAccessToEverything();
}
}
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