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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.p2.metadata.expression;
/**
* The evaluation context. Contexts can be nested and new contexts are pushed for each closure
* during an evaluation of an expression.
* @since 2.0
*/
public interface IEvaluationContext {
/**
* Retrieve the value of the given <code>variable</code> from this context
* @param variable The variable who's value should be retrieved
* @return The current value for the variable
*/
Object getValue(IExpression variable);
/**
* Set the current value for the given <code>variable</code> to <code>value</code>
* @param variable The variable who's value should be set
* @param value The new value for the variable.
*/
void setValue(IExpression variable, Object value);
/**
* Returns the value of the parameter at the given <code>position</code>
* @param position The zero based position for the parameter
* @return The parameter value
*/
Object getParameter(int position);
}
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