1 files changed, 31 insertions, 0 deletions
diff --git a/bundles/org.eclipse.equinox.p2.ql/src/org/eclipse/equinox/internal/p2/ql/KeyedParameter.java b/bundles/org.eclipse.equinox.p2.ql/src/org/eclipse/equinox/internal/p2/ql/KeyedParameter.java
new file mode 100644
index 000000000..dd8acc2e5
--- /dev/null
+++ b/bundles/org.eclipse.equinox.p2.ql/src/org/eclipse/equinox/internal/p2/ql/KeyedParameter.java
@@ -0,0 +1,31 @@
+/*******************************************************************************
+ * 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 picks an keyed parameter from the expression context.
+ */
+public final class KeyedParameter extends Parameter {
+	final String key;
+
+	public KeyedParameter(String key) {
+		this.key = key;
+	}
+
+	public Object evaluate(ExpressionContext context, VariableScope scope) {
+		return context.getParameter(key);
+	}
+
+	public void toString(StringBuffer bld) {
+		bld.append('$');
+		bld.append(key);
+	}
+}