--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/lib/jdk/test/lib/jfr/EventField.java	Tue May 15 20:24:34 2018 +0200
@@ -0,0 +1,149 @@
+/*
+ * Copyright (c) 2013, 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.test.lib.jfr;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
+
+import jdk.jfr.ValueDescriptor;
+import jdk.jfr.consumer.RecordedObject;
+import jdk.test.lib.Asserts;
+
+
+public final class EventField {
+    public final RecordedObject event;
+    public final ValueDescriptor desc;
+
+    public EventField(RecordedObject event, ValueDescriptor valueDescriptor) {
+        this.event = event;
+        this.desc = valueDescriptor;
+    }
+
+    @SuppressWarnings("unchecked")
+    public <T extends Comparable<T>> boolean isEqual(T value) {
+        return value == (T)getValue();
+    }
+
+    @SuppressWarnings("unchecked")
+    public <T extends Comparable<T>> EventField equal(T value) {
+        doAssert(()-> Asserts.assertEquals((T)getValue(), value, getErrMsg("Value not equal to " + value)));
+        return this;
+    }
+
+    @SuppressWarnings("unchecked")
+    public <T extends Comparable<T>> EventField notEqual(T value) {
+        doAssert(()-> Asserts.assertNotEquals((T)getValue(), value, getErrMsg("Value equal to " + value)));
+        return this;
+    }
+
+    @SuppressWarnings("unchecked")
+    public <T extends Comparable<T>> EventField above(T value) {
+        doAssert(()-> Asserts.assertGreaterThan((T)getValue(), value, getErrMsg("Value not above " + value)));
+        return this;
+    }
+
+    @SuppressWarnings("unchecked")
+    public <T extends Comparable<T>> EventField below(T value) {
+        doAssert(()-> Asserts.assertLessThan((T)getValue(), value, getErrMsg("Value not below " + value)));
+        return this;
+    }
+
+    @SuppressWarnings("unchecked")
+    public <T extends Comparable<T>> EventField atLeast(T value) {
+        doAssert(()-> Asserts.assertGreaterThanOrEqual((T)getValue(), value, getErrMsg("Value not atLeast" + value)));
+        return this;
+    }
+
+    @SuppressWarnings("unchecked")
+    public <T extends Comparable<T>> EventField atMost(T value) {
+        doAssert(()-> Asserts.assertLessThanOrEqual((T)getValue(), value, getErrMsg("Value not atMost " + value)));
+        return this;
+    }
+
+    public <T extends Comparable<T>> EventField instring(String part) {
+        final String value = getValue();
+        doAssert(()-> Asserts.assertTrue(value.contains(part), getErrMsg("Value does not contain '" + part +"'")));
+        return this;
+    }
+
+    @SuppressWarnings("unchecked")
+    public <T> T getValue() {
+        return (T)event.getValue(desc.getName());
+    }
+
+    public EventField notNull() {
+        doAssert(()-> Asserts.assertNotNull(getValue(), getErrMsg("Field is null")));
+        return this;
+    }
+
+    public EventField isNull() {
+        doAssert(()-> Asserts.assertNull(getValue(), getErrMsg("Field is not null")));
+        return this;
+    }
+
+    public EventField notEmpty() {
+        notNull();
+        final String s = getValue();
+        doAssert(()-> Asserts.assertFalse(s.isEmpty(), getErrMsg("Field is empty")));
+        return this;
+    }
+
+    private void doAssert(AssertFunction f) {
+        try {
+            f.doAssert();
+        } catch (RuntimeException e) {
+            System.out.printf("Error: %s%nFailed event:%n%s%n", e.getMessage(), event.toString());
+            throw e;
+        }
+    }
+
+    public EventField containsAny(String... allowed) {
+        final String value = getValue();
+        final List<String> allowedValues = Arrays.asList(allowed);
+        boolean contains = false;
+        for(String allowedValue : allowed) {
+            if (value.contains(allowedValue))  {
+                contains = true;
+            }
+        }
+        if (!contains) {
+            doAssert(()-> Asserts.fail(getErrMsg(String.format("Value not in (%s)",
+                allowedValues.stream().collect(Collectors.joining(", "))))));
+        }
+        return this;
+    }
+
+    private String getErrMsg(String msg) {
+        final String name = desc.getName();
+        final Object value = event.getValue(name);
+        return String.format("%s, field='%s', value='%s'", msg, name, value);
+    }
+
+    @FunctionalInterface
+    public interface AssertFunction {
+        void doAssert();
+    }
+}