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/*******************************************************************************
* 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;
import java.util.Map;
import org.eclipse.equinox.p2.ql.IEvaluationContext;
import org.eclipse.equinox.p2.ql.IExpression;
/**
* The immutable top level context used when evaluating an expression.
*/
public final class ParameterContext implements IEvaluationContext {
private static final Object[] noParameters = new Object[0];
private final Object[] parameters;
public ParameterContext(Object[] parameters) {
this.parameters = parameters == null ? noParameters : parameters;
}
public Object getParameter(int position) {
return parameters[position];
}
public Object getParameter(String key) {
return parameters.length == 1 && parameters[0] instanceof Map<?, ?> ? ((Map<?, ?>) parameters[0]).get(key) : null;
}
public Object getValue(IExpression variable) {
throw new IllegalArgumentException("No such variable: " + variable); //$NON-NLS-1$
}
public void setValue(IExpression variable, Object value) {
throw new IllegalArgumentException("No such variable: " + variable); //$NON-NLS-1$
}
}
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