InstallableUnitOperand.java :  » IDE-Eclipse » equinox » org » eclipse » equinox » internal » provisional » p2 » engine » Java Open Source

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/*******************************************************************************
 * 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; //$NON-NLS-1$
  }
}
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