--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.jfr/share/classes/jdk/jfr/internal/tool/EventPrintWriter.java	Wed Dec 05 16:40:12 2018 +0100
@@ -0,0 +1,139 @@
+/*
+ * Copyright (c) 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.tool;
+
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.function.Predicate;
+
+import jdk.jfr.EventType;
+import jdk.jfr.Timespan;
+import jdk.jfr.Timestamp;
+import jdk.jfr.ValueDescriptor;
+import jdk.jfr.consumer.RecordedEvent;
+import jdk.jfr.consumer.RecordedObject;
+import jdk.jfr.consumer.RecordingFile;
+import jdk.jfr.internal.consumer.RecordingInternals;
+
+abstract class EventPrintWriter extends StructuredWriter {
+
+    enum ValueType {
+        TIMESPAN, TIMESTAMP, OTHER
+    }
+
+    protected static final String STACK_TRACE_FIELD = "stackTrace";
+    protected static final String EVENT_THREAD_FIELD = "eventThread";
+
+    private Predicate<EventType> eventFilter = x -> true;
+    private int stackDepth;
+
+    // cach that will speed up annotation lookup
+    private Map<ValueDescriptor, ValueType> typeOfValues = new HashMap<>();
+
+    EventPrintWriter(PrintWriter p) {
+        super(p);
+    }
+
+    abstract protected void print(List<RecordedEvent> events);
+
+    void print(Path source) throws FileNotFoundException, IOException {
+        List<RecordedEvent> events = new ArrayList<>(500_000);
+        printBegin();
+        try (RecordingFile file = new RecordingFile(source)) {
+            while (file.hasMoreEvents()) {
+                RecordedEvent event = file.readEvent();
+                if (acceptEvent(event)) {
+                    events.add(event);
+                }
+                if (RecordingInternals.INSTANCE.isLastEventInChunk(file)) {
+                    RecordingInternals.INSTANCE.sort(events);
+                    print(events);
+                    events.clear();
+                }
+            }
+        }
+        printEnd();
+        flush(true);
+    }
+
+    protected void printEnd() {
+    }
+
+    protected void printBegin() {
+    }
+
+    public final void setEventFilter(Predicate<EventType> eventFilter) {
+        this.eventFilter = eventFilter;
+    }
+
+    protected final boolean acceptEvent(RecordedEvent event) {
+        return eventFilter.test(event.getEventType());
+    }
+
+    protected final int getStackDepth() {
+        return stackDepth;
+    }
+
+    protected final boolean isLateField(String name) {
+        return name.equals(EVENT_THREAD_FIELD) || name.equals(STACK_TRACE_FIELD);
+    }
+
+    public void setStackDepth(int stackDepth) {
+        this.stackDepth = stackDepth;
+    }
+
+    protected Object getValue(RecordedObject object, ValueDescriptor v) {
+        ValueType valueType = typeOfValues.get(v);
+        if (valueType == null) {
+            valueType = determineValueType(v);
+            typeOfValues.put(v, valueType);
+        }
+        switch (valueType) {
+        case TIMESPAN:
+            return object.getDuration(v.getName());
+        case TIMESTAMP:
+            return RecordingInternals.INSTANCE.getOffsetDataTime(object, v.getName());
+        default:
+            return object.getValue(v.getName());
+        }
+    }
+    // It's expensive t check
+    private ValueType determineValueType(ValueDescriptor v) {
+        if (v.getAnnotation(Timespan.class) != null) {
+            return ValueType.TIMESPAN;
+        }
+        if (v.getAnnotation(Timestamp.class) != null) {
+            return ValueType.TIMESTAMP;
+        }
+        return ValueType.OTHER;
+    }
+}