Java tutorial
/* * Firetweet - Twitter client for Android * * Copyright (C) 2012-2014 Mariotaku Lee <mariotaku.lee@gmail.com> * * 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 * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package org.getlantern.firetweet.model; import android.location.Location; import android.os.Parcel; import android.os.Parcelable; import android.support.annotation.NonNull; import android.support.annotation.Nullable; import org.getlantern.jsonserializer.JSONParcel; import org.getlantern.jsonserializer.JSONParcelable; import org.getlantern.firetweet.util.ParseUtils; import java.io.Serializable; import twitter4j.GeoLocation; public class ParcelableLocation implements Serializable, Parcelable, JSONParcelable { private static final long serialVersionUID = -1690848439775407442L; public final double latitude, longitude; public static final Parcelable.Creator<ParcelableLocation> CREATOR = new Parcelable.Creator<ParcelableLocation>() { @Override public ParcelableLocation createFromParcel(final Parcel in) { return new ParcelableLocation(in); } @Override public ParcelableLocation[] newArray(final int size) { return new ParcelableLocation[size]; } }; public static final JSONParcelable.Creator<ParcelableLocation> JSON_CREATOR = new JSONParcelable.Creator<ParcelableLocation>() { @Override public ParcelableLocation createFromParcel(final JSONParcel in) { return new ParcelableLocation(in); } @Override public ParcelableLocation[] newArray(final int size) { return new ParcelableLocation[size]; } }; public ParcelableLocation(final double latitude, final double longitude) { this.latitude = latitude; this.longitude = longitude; } public ParcelableLocation(@Nullable final GeoLocation location) { latitude = location != null ? location.getLatitude() : Double.NaN; longitude = location != null ? location.getLongitude() : Double.NaN; } public ParcelableLocation(@NonNull final JSONParcel in) { latitude = in.readDouble("latitude", Double.NaN); longitude = in.readDouble("longitude", Double.NaN); } public ParcelableLocation(@Nullable final Location location) { latitude = location != null ? location.getLatitude() : Double.NaN; longitude = location != null ? location.getLongitude() : Double.NaN; } public ParcelableLocation(final Parcel in) { latitude = in.readDouble(); longitude = in.readDouble(); } public ParcelableLocation(final String locationString) { if (locationString == null) { latitude = Double.NaN; longitude = Double.NaN; return; } final String[] longlat = locationString.split(","); if (longlat.length != 2) { latitude = Double.NaN; longitude = Double.NaN; } else { latitude = ParseUtils.parseDouble(longlat[0], Double.NaN); longitude = ParseUtils.parseDouble(longlat[1], Double.NaN); } } @Override public int describeContents() { return hashCode(); } @Override public boolean equals(final Object obj) { if (this == obj) return true; if (obj == null) return false; if (!(obj instanceof ParcelableLocation)) return false; final ParcelableLocation other = (ParcelableLocation) obj; if (Double.doubleToLongBits(latitude) != Double.doubleToLongBits(other.latitude)) return false; if (Double.doubleToLongBits(longitude) != Double.doubleToLongBits(other.longitude)) return false; return true; } @Nullable public static ParcelableLocation fromGeoLocation(@Nullable GeoLocation geoLocation) { if (geoLocation == null) return null; return new ParcelableLocation(geoLocation); } @Nullable public static ParcelableLocation fromLocation(@Nullable Location location) { if (location == null) return null; return new ParcelableLocation(location); } public String getHumanReadableString(int decimalDigits) { return String.format("%s,%s", ParseUtils.parsePrettyDecimal(latitude, decimalDigits), ParseUtils.parsePrettyDecimal(longitude, decimalDigits)); } @Override public int hashCode() { final int prime = 31; int result = 1; long temp; temp = Double.doubleToLongBits(latitude); result = prime * result + (int) (temp ^ temp >>> 32); temp = Double.doubleToLongBits(longitude); result = prime * result + (int) (temp ^ temp >>> 32); return result; } public boolean isValid() { return isValidLocation(latitude, longitude); } public static boolean isValidLocation(double latitude, double longitude) { return !Double.isNaN(latitude) && !Double.isNaN(longitude); } public GeoLocation toGeoLocation() { return isValid() ? new GeoLocation(latitude, longitude) : null; } @Override public String toString() { return "ParcelableLocation{latitude=" + latitude + ", longitude=" + longitude + "}"; } @Override public void writeToParcel(final JSONParcel out) { out.writeDouble("latitude", latitude); out.writeDouble("longitude", longitude); } @Override public void writeToParcel(final Parcel out, final int flags) { out.writeDouble(latitude); out.writeDouble(longitude); } public static ParcelableLocation fromString(final String string) { final ParcelableLocation location = new ParcelableLocation(string); if (ParcelableLocation.isValidLocation(location)) return location; return null; } public static boolean isValidLocation(final ParcelableLocation location) { return location != null && location.isValid(); } public static GeoLocation toGeoLocation(final ParcelableLocation location) { return isValidLocation(location) ? location.toGeoLocation() : null; } public static String toString(final ParcelableLocation location) { if (!isValidLocation(location)) return null; return toString(location.latitude, location.longitude); } public static String toString(double latitude, double longitude) { return latitude + "," + longitude; } }