--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.jfr/share/classes/jdk/jfr/consumer/InternalEventFilter.java	Fri May 17 18:03:14 2019 +0200
@@ -0,0 +1,107 @@
+/*
+ * Copyright (c) 2019, 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.consumer;
+
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+
+public final class InternalEventFilter {
+    static final InternalEventFilter ACCEPT_ALL = new InternalEventFilter();
+    private final Map<String, Long> thresholds = new HashMap<>();
+    private boolean acceptAll;
+
+    public static InternalEventFilter merge(Collection<InternalEventFilter> filters) {
+        for (InternalEventFilter ef : filters) {
+            if (ef.getAcceptAll()) {
+                return ACCEPT_ALL;
+            }
+        }
+        if (filters.size() == 1) {
+            return filters.iterator().next();
+        }
+
+        Set<String> eventNames = new HashSet<>();
+        for (InternalEventFilter ef : filters) {
+            eventNames.addAll(ef.thresholds.keySet());
+        }
+        InternalEventFilter result = new InternalEventFilter();
+        for (String eventName : eventNames) {
+            for (InternalEventFilter ef : filters) {
+                Long l = ef.thresholds.get(eventName);
+                if (l != null) {
+                    result.setThreshold(eventName, l.longValue());
+                }
+            }
+        }
+        return result;
+    }
+
+    private boolean getAcceptAll() {
+        return acceptAll;
+    }
+
+    public void setAcceptAll() {
+        acceptAll = true;
+    }
+
+    public void setThreshold(String eventName, long nanos) {
+        Long l = thresholds.get(eventName);
+        if (l != null) {
+            l = Math.min(l, nanos);
+        } else {
+            l = nanos;
+        }
+        thresholds.put(eventName, l);
+    }
+
+    public long getThreshold(String eventName) {
+        if (acceptAll) {
+            return 0;
+        }
+        Long l = thresholds.get(eventName);
+        if (l != null) {
+            return l;
+        }
+        return -1;
+    }
+    public String toString() {
+        if (acceptAll) {
+            return "ACCEPT ALL";
+        }
+        StringBuilder sb = new StringBuilder();
+        for (String key : thresholds.keySet().toArray(new String[0])) {
+            Long value = thresholds.get(key);
+            sb.append(key);
+            sb.append(" = ");
+            sb.append(value.longValue() / 1_000_000);
+            sb.append(" ms");
+        }
+        return sb.toString();
+    }
+}
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