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Trip.Leg: Implement custom serialization for List<Point> path, because it was wasting a lot of space.

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This commit is contained in:
Andreas Schildbach 2018-12-02 19:15:41 +01:00
parent ae7146050a
commit e9f06c0741
1 changed files with 36 additions and 2 deletions
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38
enabler/src/de/schildbach/pte/dto/Trip.java
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@ -1,5 +1,5 @@
/*
* Copyright 2010-2015 the original author or authors.
* Copyright the original author or authors.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@ -20,7 +20,12 @@ package de.schildbach.pte.dto;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import java.io.EOFException;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Date;
import java.util.EnumSet;
import java.util.List;
@ -299,7 +304,7 @@ public final class Trip implements Serializable {
public final Location departure;
public final Location arrival;
public List<Point> path;
public transient List<Point> path; // custom serialization, to save space
public Leg(final Location departure, final Location arrival, final List<Point> path) {
this.departure = checkNotNull(departure);
@ -318,6 +323,35 @@ public final class Trip implements Serializable {
/** Maximum time occurring in this leg. */
public abstract Date getMaxTime();
private void writeObject(final ObjectOutputStream os) throws IOException {
os.defaultWriteObject();
if (path != null) {
os.writeInt(path.size());
for (final Point p : path) {
os.writeInt(p.getLatAs1E6());
os.writeInt(p.getLonAs1E6());
}
} else {
os.writeInt(-1);
}
}
private void readObject(final ObjectInputStream is) throws ClassNotFoundException, IOException {
is.defaultReadObject();
try {
final int pathSize = is.readInt();
if (pathSize >= 0) {
path = new ArrayList<>(pathSize);
for (int i = 0; i < pathSize; i++)
path.add(Point.from1E6(is.readInt(), is.readInt()));
} else {
path = null;
}
} catch (final EOFException x) {
path = null;
}
}
}
public final static class Public extends Leg {