1 files changed, 55 insertions, 0 deletions
diff --git a/bundles/org.eclipse.equinox.p2.engine/src/org/eclipse/equinox/p2/engine/PropertyOperand.java b/bundles/org.eclipse.equinox.p2.engine/src/org/eclipse/equinox/p2/engine/PropertyOperand.java
new file mode 100644
index 000000000..3751abb39
--- /dev/null
+++ b/bundles/org.eclipse.equinox.p2.engine/src/org/eclipse/equinox/p2/engine/PropertyOperand.java
@@ -0,0 +1,55 @@
+/*******************************************************************************
+ * Copyright (c) 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;
+
+/**
+ * @since 2.0
+ */
+public class PropertyOperand extends Operand {
+	private final Object first;
+	private final Object second;
+	private final String key;
+
+	/**
+	 * Creates a new operand that represents replacing a property value
+	 * with another.  At least one of the provided property values must be
+	 * non-null.
+	 * 
+	 * @param key The key of the property being modified
+	 * @param first The property value being removed, or <code>null</code>
+	 * @param second The property value being added, or <code>null</code>
+	 */
+	public PropertyOperand(String key, Object first, Object second) {
+		//the operand must specify have a key and have at least one non-null value
+		Assert.isTrue(key != null && (first != null || second != null));
+		this.first = first;
+		this.second = second;
+		this.key = key;
+	}
+
+	public Object first() {
+		return first;
+	}
+
+	public Object second() {
+		return second;
+	}
+
+	public String getKey() {
+		return key;
+	}
+
+	public String toString() {
+		return key + " = " + first + " --> " + second; //$NON-NLS-1$ //$NON-NLS-2$
+	}
+}