001/* Track.java -- A track of MIDI events 002 Copyright (C) 2005 Free Software Foundation, Inc. 003 004This file is part of GNU Classpath. 005 006GNU Classpath is free software; you can redistribute it and/or modify 007it under the terms of the GNU General Public License as published by 008the Free Software Foundation; either version 2, or (at your option) 009any later version. 010 011GNU Classpath is distributed in the hope that it will be useful, but 012WITHOUT ANY WARRANTY; without even the implied warranty of 013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014General Public License for more details. 015 016You should have received a copy of the GNU General Public License 017along with GNU Classpath; see the file COPYING. If not, write to the 018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 01902110-1301 USA. 020 021Linking this library statically or dynamically with other modules is 022making a combined work based on this library. Thus, the terms and 023conditions of the GNU General Public License cover the whole 024combination. 025 026As a special exception, the copyright holders of this library give you 027permission to link this library with independent modules to produce an 028executable, regardless of the license terms of these independent 029modules, and to copy and distribute the resulting executable under 030terms of your choice, provided that you also meet, for each linked 031independent module, the terms and conditions of the license of that 032module. An independent module is a module which is not derived from 033or based on this library. If you modify this library, you may extend 034this exception to your version of the library, but you are not 035obligated to do so. If you do not wish to do so, delete this 036exception statement from your version. */ 037 038 039package javax.sound.midi; 040 041import java.util.HashSet; 042import java.util.Vector; 043 044/** 045 * A Track contains a list of timecoded MIDI events for processing 046 * by a Sequencer. 047 * 048 * @author Anthony Green (green@redhat.com) 049 * @since 1.3 050 * 051 */ 052public class Track 053{ 054 /** 055 * The list of MidiEvents for this track. 056 */ 057 Vector events = new Vector(); 058 059 // A HashSet to speed processing 060 private HashSet eventSet = new HashSet(); 061 062 // This is only instantiable within this package. 063 Track() 064 { 065 } 066 067 /** 068 * Add a new event to this track. Specific events may only be added once. 069 * The event will be inserted into the appropriate spot in the event list 070 * based on its timecode. 071 * 072 * @param event the event to add 073 * @return true if the event was added, false otherwise 074 */ 075 public boolean add(MidiEvent event) 076 { 077 synchronized (events) 078 { 079 if (eventSet.contains(event)) 080 return false; 081 082 eventSet.add(event); 083 084 long targetTick = event.getTick(); 085 int i = events.size() - 1; 086 while (i >= 0 && (((MidiEvent)events.get(i)).getTick() > targetTick)) 087 i--; 088 events.add(i+1, event); 089 return true; 090 } 091 } 092 093 /** 094 * Remove an event from this track. 095 * 096 * @param event the event to remove 097 * @return true if the event was removed, false otherwise 098 */ 099 public boolean remove(MidiEvent event) 100 { 101 synchronized (events) 102 { 103 if (! eventSet.remove(event)) 104 return false; 105 106 int i = events.indexOf(event); 107 if (i >= 0) 108 { 109 events.remove(i); 110 return true; 111 } 112 113 throw new InternalError("event in set but not list"); 114 } 115 } 116 117 /** 118 * Get an event idetified by its order index 119 * 120 * @param index the location of the event to get 121 * @return the event at index 122 * @throws ArrayIndexOutOfBoundsException if index is out of bounds 123 */ 124 public MidiEvent get(int index) throws ArrayIndexOutOfBoundsException 125 { 126 synchronized (events) 127 { 128 try 129 { 130 return (MidiEvent) events.get(index); 131 } 132 catch (IndexOutOfBoundsException e) 133 { 134 throw (ArrayIndexOutOfBoundsException) 135 new ArrayIndexOutOfBoundsException().initCause(e); 136 } 137 } 138 } 139 140 141 /** 142 * Get the number events in this track. 143 * 144 * @return the number of events in this track 145 */ 146 public int size() 147 { 148 return events.size(); 149 } 150 151 /** 152 * Get the length of the track in MIDI ticks. 153 * 154 * @return the length of the track in MIDI ticks 155 */ 156 public long ticks() 157 { 158 synchronized (events) 159 { 160 int size = events.size(); 161 return ((MidiEvent) events.get(size - 1)).getTick(); 162 } 163 } 164 } 165