| /******************************************************************************* |
| * 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; |
| |
| final class SingleVariableScope implements VariableScope { |
| private final VariableScope parentScope; |
| |
| private Object value; |
| |
| private final Variable variable; |
| |
| public SingleVariableScope(Variable variable) { |
| this.parentScope = ROOT; |
| this.variable = variable; |
| } |
| |
| public SingleVariableScope(VariableScope parentScope, Variable variable) { |
| this.parentScope = parentScope; |
| this.variable = variable; |
| } |
| |
| public Object getValue(Variable var) { |
| return variable == var ? value : parentScope.getValue(var); |
| } |
| |
| public void setValue(Variable var, Object val) { |
| if (variable == var) |
| value = val; |
| else |
| parentScope.setValue(var, val); |
| } |
| } |