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Note.java
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Note.java
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package music;
/**
* Note represents a note played by an instrument.
*/
public class Note implements Music {
private final double duration;
private final Pitch pitch;
private final Instrument instrument;
private void checkRep() {
assert duration >= 0;
assert pitch != null;
assert instrument != null;
}
/**
* Make a Note played by instrument for duration beats.
* @param duration duration in beats, must be >= 0
* @param pitch pitch to play
* @param instrument instrument to use
*/
public Note(double duration, Pitch pitch, Instrument instrument) {
this.duration = duration;
this.pitch = pitch;
this.instrument = instrument;
checkRep();
}
/**
* @return pitch of this note
*/
public Pitch pitch() {
return pitch;
}
/**
* @return instrument that should play this note
*/
public Instrument instrument() {
return instrument;
}
/**
* @return duration of this note
*/
public double duration() {
return duration;
}
/**
* Play this note.
*/
public void play(SequencePlayer player, double atBeat) {
player.addNote(instrument, pitch, atBeat, duration);
}
@Override
public int hashCode() {
long durationBits = Double.doubleToLongBits(duration);
return (int) (durationBits ^ (durationBits >>> 32))
+ instrument.hashCode()
+ pitch.hashCode();
}
@Override
public boolean equals(Object obj) {
if (this == obj) return true;
if (obj == null) return false;
if (getClass() != obj.getClass()) return false;
final Note other = (Note) obj;
return duration == other.duration
&& instrument.equals(other.instrument)
&& pitch.equals(other.pitch);
}
@Override
public String toString() {
return pitch.toString() + duration;
}
}