| /******************************************************************************* |
| * Copyright (c) 2007, 2008 IBM Corporation 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: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.equinox.internal.provisional.p2.engine; |
| |
| import org.eclipse.core.runtime.Assert; |
| import org.eclipse.equinox.internal.provisional.p2.metadata.IInstallableUnit; |
| |
| public class InstallableUnitOperand extends Operand { |
| private final IInstallableUnit first; |
| private final IInstallableUnit second; |
| |
| /** |
| * Creates a new operand that represents replacing an installable unit |
| * with another. At least one of the provided installable units must be |
| * non-null. |
| * |
| * @param first The installable unit being removed, or <code>null</code> |
| * @param second The installable unit being added, or <code>null</code> |
| */ |
| public InstallableUnitOperand(IInstallableUnit first, IInstallableUnit second) { |
| //the operand must have at least one non-null units |
| Assert.isTrue(first != null || second != null); |
| this.first = first; |
| this.second = second; |
| } |
| |
| public IInstallableUnit first() { |
| return first; |
| } |
| |
| public IInstallableUnit second() { |
| return second; |
| } |
| |
| public String toString() { |
| return first + " --> " + second; //$NON-NLS-1$ |
| } |
| } |