| 1 | /******************************************************************************* |
| 2 | * Copyright (c) 2013 École Polytechnique de Montréal |
| 3 | * |
| 4 | * All rights reserved. This program and the accompanying materials are made |
| 5 | * available under the terms of the Eclipse Public License v1.0 which |
| 6 | * accompanies this distribution, and is available at |
| 7 | * http://www.eclipse.org/legal/epl-v10.html |
| 8 | * |
| 9 | * Contributors: |
| 10 | * Geneviève Bastien - Initial implementation and API |
| 11 | *******************************************************************************/ |
| 12 | |
| 13 | package org.eclipse.linuxtools.internal.tmf.core.synchronization; |
| 14 | |
| 15 | import org.eclipse.linuxtools.tmf.core.synchronization.ITmfTimestampTransform; |
| 16 | import org.eclipse.linuxtools.tmf.core.timestamp.ITmfTimestamp; |
| 17 | |
| 18 | /** |
| 19 | * A default simple, identity timestamp transform. It is a singleton class and |
| 20 | * returns the timestamp itself |
| 21 | * |
| 22 | * @author Geneviève Bastien |
| 23 | */ |
| 24 | public final class TmfTimestampTransform implements ITmfTimestampTransformInvertible { |
| 25 | |
| 26 | /** |
| 27 | * Generated serial UID |
| 28 | */ |
| 29 | private static final long serialVersionUID = -1480581417493073304L; |
| 30 | |
| 31 | /** |
| 32 | * The unique instance of this transform, since it is always the same |
| 33 | */ |
| 34 | public static final TmfTimestampTransform IDENTITY = new TmfTimestampTransform(); |
| 35 | |
| 36 | /** |
| 37 | * Default constructor |
| 38 | */ |
| 39 | private TmfTimestampTransform() { |
| 40 | |
| 41 | } |
| 42 | |
| 43 | @Override |
| 44 | public ITmfTimestamp transform(ITmfTimestamp timestamp) { |
| 45 | return timestamp; |
| 46 | } |
| 47 | |
| 48 | @Override |
| 49 | public long transform(long timestamp) { |
| 50 | return timestamp; |
| 51 | } |
| 52 | |
| 53 | @Override |
| 54 | public ITmfTimestampTransform composeWith(ITmfTimestampTransform composeWith) { |
| 55 | /* Since this transform will not modify anything, return the other */ |
| 56 | return composeWith; |
| 57 | } |
| 58 | |
| 59 | @Override |
| 60 | public boolean equals(Object other) { |
| 61 | return other.getClass().equals(TmfTimestampTransform.class); |
| 62 | } |
| 63 | |
| 64 | @Override |
| 65 | public int hashCode() { |
| 66 | final int prime = 31; |
| 67 | int result = 1; |
| 68 | result = (prime * result) + TmfTimestampTransform.class.hashCode(); |
| 69 | return result; |
| 70 | } |
| 71 | |
| 72 | @Override |
| 73 | public String toString() { |
| 74 | return "TmfTimestampTransform [ IDENTITY ]"; //$NON-NLS-1$ |
| 75 | } |
| 76 | |
| 77 | @Override |
| 78 | public ITmfTimestampTransform inverse() { |
| 79 | return IDENTITY; |
| 80 | } |
| 81 | |
| 82 | } |