1 files changed, 49 insertions, 0 deletions
diff --git a/bundles/org.eclipse.equinox.p2.engine/src/org/eclipse/equinox/p2/engine/InstallableUnitOperand.java b/bundles/org.eclipse.equinox.p2.engine/src/org/eclipse/equinox/p2/engine/InstallableUnitOperand.java
new file mode 100644
index 000000000..edab40f53
--- /dev/null
+++ b/bundles/org.eclipse.equinox.p2.engine/src/org/eclipse/equinox/p2/engine/InstallableUnitOperand.java
@@ -0,0 +1,49 @@
+/*******************************************************************************
+ * 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.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; //$NON-NLS-1$
+	}
+}