/*

 * Copyright (c) 2016, 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

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package jdk.jfr.consumer;

import static jdk.jfr.internal.EventInstrumentation.FIELD_DURATION;

import java.io.IOException;

import java.util.List;

import jdk.jfr.EventType;

import jdk.jfr.ValueDescriptor;

import jdk.jfr.internal.consumer.Parser;

import jdk.jfr.internal.consumer.RecordingInput;

/**

 * Parses an event and returns a {@link RecordedEvent}.

 *

 */

final class EventParser extends Parser {

    private final Parser[] parsers;

    private final EventType eventType;

    private final TimeConverter timeConverter;

    private final boolean hasDuration;

    private final List<ValueDescriptor> valueDescriptors;

    private final int startIndex;

    private long thresholdTicks = -1;

    private boolean enabled = true;

    EventParser(TimeConverter timeConverter, EventType type, Parser[] parsers) {

        this.timeConverter = timeConverter;

        this.parsers = parsers;

        this.eventType = type;

        this.hasDuration = type.getField(FIELD_DURATION) != null;

        this.startIndex = hasDuration ? 2 : 1;

        this.valueDescriptors = type.getFields();

    }

    public EventType getEventType() {

        return eventType;

    }

    public void setThreshold(long thresholdTicks) {

        this.thresholdTicks = thresholdTicks;

    }

    public void setEnabled(boolean enabled) {

        this.enabled = enabled;

    }

    public boolean isEnabled() {

        return this.enabled;

    }

    public RecordedEvent parse(RecordingInput input) throws IOException {

        if (enabled) {

            long startTicks = input.readLong();

            long durationTicks = 0;

            if (hasDuration) {

                durationTicks = input.readLong();

                if (durationTicks < thresholdTicks) {

                    return null;

                }

            }

                Object[] values = event.objects;

                for (int i = startIndex; i < parsers.length; i++) {

                    values[i] = parsers[i].parse(input);

                }

                values[0] = startTicks;

                if (hasDuration) {

                    values[1] = Long.valueOf(durationTicks);

                }

                long startTime = timeConverter.convertTimestamp(startTicks);

                if (hasDuration) {

                    event.startTime = startTime;

                    event.endTime = timeConverter.convertTimestamp(startTicks + durationTicks);

                    return event;

                } else {

                    event.startTime = startTime;

                    event.endTime = startTime;

                    return event;

                }

            } else {

                Object[] values = new Object[parsers.length];

                for (int i = startIndex; i < parsers.length; i++) {

                    values[i] = parsers[i].parse(input);

                }

                values[0] = startTicks;

                if (hasDuration) {

                    values[1] = Long.valueOf(durationTicks);

                }

                long startTime = timeConverter.convertTimestamp(startTicks);

                if (hasDuration) {

                    long endTime = timeConverter.convertTimestamp(startTicks + durationTicks);

                    return new RecordedEvent(eventType, valueDescriptors, values, startTime, endTime, timeConverter);

                } else {

                    return new RecordedEvent(eventType, valueDescriptors, values, startTime, startTime, timeConverter);

                }

            }

        }

    }

    @Override

    public void skip(RecordingInput input) throws IOException {

        throw new InternalError("Should not call this method. More efficent to read event size and skip ahead");

    }

    }

}