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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;
/**
* The abstract base class for the indexed and keyed parameters
*/
public class Parameter extends Expression {
final int position;
Parameter(int position) {
this.position = position;
}
public int compareTo(Expression e) {
int cmp = super.compareTo(e);
if (cmp == 0)
cmp = position - ((Parameter) e).position;
return cmp;
}
public boolean equals(Object o) {
if (o == this)
return true;
if (o == null)
return false;
return getClass() == o.getClass() && position == ((Parameter) o).position;
}
public Object evaluate(IEvaluationContext context) {
return context.getParameter(position);
}
public int getExpressionType() {
return TYPE_PARAMETER;
}
public String getOperator() {
return OPERATOR_PARAMETER;
}
public int getPriority() {
return PRIORITY_VARIABLE;
}
public int hashCode() {
return 31 * (1 + position);
}
public void toString(StringBuffer bld, Variable rootVariable) {
bld.append('$');
bld.append(position);
}
}
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