1 files changed, 34 insertions, 0 deletions
diff --git a/bundles/org.eclipse.equinox.p2.ql/src/org/eclipse/equinox/internal/p2/ql/Not.java b/bundles/org.eclipse.equinox.p2.ql/src/org/eclipse/equinox/internal/p2/ql/Not.java
new file mode 100644
index 000000000..6e2bc7048
--- /dev/null
+++ b/bundles/org.eclipse.equinox.p2.ql/src/org/eclipse/equinox/internal/p2/ql/Not.java
@@ -0,0 +1,34 @@
+/*******************************************************************************
+ * Copyright (c) 2009 Cloudsmith Inc. 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:
+ *     Cloudsmith Inc. - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.equinox.internal.p2.ql;
+
+/**
+ * An expression that yields <code>true</code> when its operand does not.
+ */
+public final class Not extends Unary {
+	public static final String OPERATOR = "!"; //$NON-NLS-1$
+
+	public Not(Expression operand) {
+		super(operand);
+	}
+
+	public Object evaluate(ExpressionContext context, VariableScope scope) {
+		return Boolean.valueOf(operand.evaluate(context, scope) != Boolean.TRUE);
+	}
+
+	String getOperator() {
+		return OPERATOR;
+	}
+
+	int getPriority() {
+		return ExpressionParser.PRIORITY_NOT;
+	}
+}