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/*******************************************************************************
* Copyright (c) 2007, 2010 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.p2.engine;
import org.eclipse.core.runtime.Assert;
import org.eclipse.equinox.p2.metadata.IInstallableUnit;
/**
* @since 2.0
*/
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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