| /******************************************************************************* |
| * Copyright (c) 2015 EfficiOS Inc., Alexandre Montplaisir |
| * |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| *******************************************************************************/ |
| |
| package org.eclipse.tracecompass.segmentstore.core; |
| |
| import org.eclipse.jdt.annotation.NonNull; |
| import org.eclipse.tracecompass.datastore.core.encoding.HTVarInt; |
| import org.eclipse.tracecompass.datastore.core.interval.IHTIntervalReader; |
| import org.eclipse.tracecompass.datastore.core.serialization.ISafeByteBufferWriter; |
| |
| /** |
| * Basic implementation of {@link ISegment}. |
| * |
| * @author Alexandre Montplaisir |
| */ |
| public class BasicSegment implements ISegment { |
| |
| /** |
| * The factory to read an object from a buffer |
| * @since 2.0 |
| */ |
| public static final IHTIntervalReader<BasicSegment> BASIC_SEGMENT_READ_FACTORY = buffer -> { |
| long start = buffer.getLong(); |
| return new BasicSegment(start, start + HTVarInt.readLong(buffer)); |
| }; |
| |
| private static final long serialVersionUID = -3257452887960883177L; |
| |
| private final long fStart; |
| private final long fDuration; |
| |
| /** |
| * Create a new segment. |
| * |
| * The end position should be equal to or greater than the start position. |
| * |
| * @param start |
| * Start position of the segment |
| * @param end |
| * End position of the segment |
| */ |
| public BasicSegment(long start, long end) { |
| if (end < start) { |
| throw new IllegalArgumentException(); |
| } |
| fStart = start; |
| fDuration = end - start; |
| } |
| |
| @Override |
| public long getStart() { |
| return fStart; |
| } |
| |
| @Override |
| public long getEnd() { |
| return fStart + fDuration; |
| } |
| |
| /** |
| * @since 2.0 |
| */ |
| @Override |
| public int getSizeOnDisk() { |
| // Save the start and end time |
| return HTVarInt.getEncodedLengthLong(fDuration) + Long.BYTES; |
| } |
| |
| /** |
| * @since 2.0 |
| */ |
| @Override |
| public void writeSegment(@NonNull ISafeByteBufferWriter buffer) { |
| buffer.putLong(getStart()); |
| HTVarInt.writeLong(buffer, fDuration); |
| } |
| |
| @Override |
| public String toString() { |
| StringBuilder sb = new StringBuilder(); |
| |
| sb.append('['); |
| sb.append(fStart); |
| sb.append(", "); //$NON-NLS-1$ |
| sb.append(fStart + fDuration); |
| sb.append(']'); |
| |
| return sb.toString(); |
| } |
| |
| } |