--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.jfr/share/classes/jdk/jfr/internal/settings/BooleanValue.java	Tue May 15 20:24:34 2018 +0200
@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package jdk.jfr.internal.settings;
+
+import java.util.Set;
+
+/**
+ * Helper class for settings that use boolean numbers
+ *
+ */
+final class BooleanValue  {
+    private String value = "false";
+    private boolean booleanValue;
+
+    private BooleanValue(boolean b) {
+        booleanValue = b;
+        value = b ? "true" : "false";
+    }
+
+    public String union(Set<String> values) {
+        for (String v : values) {
+            if ("true".equals(v)) {
+                return "true";
+            }
+        }
+        return "false";
+    }
+
+    public void setValue(String value) {
+        this.value = value;
+        this.booleanValue = Boolean.valueOf(value);
+    }
+
+    public final String getValue() {
+        return this.value;
+    }
+
+    public boolean getBoolean() {
+        return booleanValue;
+    }
+
+    public static BooleanValue valueOf(String defaultValue) {
+        if ("true".equals(defaultValue)) {
+            return new BooleanValue(true);
+        }
+        if ("false".equals(defaultValue)) {
+            return new BooleanValue(false);
+        }
+        throw new InternalError("Unknown default value for settings '" + defaultValue + "'");
+    }
+}