SET kekunci id [Nilai nama FIELD ...] [EX saat] [NX|XX] (OBJEK geojson )|(POINT lat lon z)|(BOUNDS minlat minlon maxlat maxlon)|(HASH geohash)|(Nilai STRING)
set
arahan adalah bersamaan dengan perintah hash
dalam redis Use juga merupakan gabungan key
dan id
, tetapi perbezaannya ialah perintah set
Tile38 juga boleh membawa lebih banyak atribut lain, seperti menyesuaikan medan FIELD
dan menetapkan tempoh sah EX
Tunggu, kemudian kami perlu mereka bentuk java api
yang berguna untuk sintaks ini supaya pembangun boleh menggunakan Tile38 dengan lebih baik.
Pertama sekali, mengikut tatabahasa yang disediakan di atas, kita boleh membahagikannya kepada tiga bahagian:
1 perintah SET
, kami Anggap kata kunci ini sebagai bahagian yang berasingan; Bahagian kedua ialah
key id [FIELD name value ...] [EX seconds] [NX|XX]
Reka bentuk kod1 Kami menguruskan bahagian pertama kata kunci arahan melalui penghitungan:
enum Tile38Command implements ProtocolKeyword { SET; public final byte[] bytes; static final String UNDERSCORE = "_"; static final String SPACE = " "; Tile38Command() { String name = StringUtils.replace(this.name(), UNDERSCORE, SPACE); this.bytes = name.getBytes(StandardCharsets.US_ASCII); } @Override public byte[] getBytes() { return this.bytes; } }
public class SetOpts { private String key; private String id; //字段值必须是双精度浮点型 private Map<String, Double> fields; // 单位秒 private int ex; // 创建方式: // NX 不存在的时候创建 // XX 存在的时候更新 private NxXx nxXx; private SetOpts(Builder builder) { this.key = builder.key; this.id = builder.id; this.fields = builder.fields; this.ex = builder.ex; this.nxXx = builder.nxXx; } // 把所有的参数按顺序放到列表中 public List<String> commandLine() { List<String> result = new LinkedList<>(); result.add(this.key); result.add(this.id); // 添加所有的FIELD if (MapUtils.isNotEmpty(this.fields)) { for (Map.Entry<String, Double> entry : this.fields.entrySet()) { result.add("FIELD"); result.add(entry.getKey()); result.add(entry.getValue().toString()); } } // 添加`EX` if (this.ex >= 0) { result.add("EX"); result.add(String.valueOf(this.ex)); } // 添加NX或XX if (Objects.nonNull(this.nxXx)) { result.add(this.nxXx.name()); } // 返回结果 return result; } public enum NxXx { NX, XX } // 建造者模式 public static class Builder { private String key; private String id; //字段值必须是双精度浮点型 private Map<String, Double> fields; // 单位秒 private int ex = -1; // 创建方式: // NX 不存在的时候创建 // XX 存在的时候更新 private NxXx nxXx; public Builder key(String key) { this.key = key; return this; } public Builder id(String id) { this.id = id; return this; } public Builder field(String field, double value) { if (Objects.isNull(this.fields)) { this.fields = new LinkedHashMap<>(); } this.fields.put(field, value); return this; } public Builder ex(int seconds) { this.ex = seconds; return this; } public Builder nxXx(NxXx nxXx) { this.nxXx = nxXx; return this; } public SetOpts build() throws AwesomeException { if (StringUtils.isEmpty(this.key)) { throw new AwesomeException(500, "key is empty"); } if (StringUtils.isEmpty(this.id)) { throw new AwesomeException(500, "id is empty"); } // 创建SetOpts对象 return new SetOpts(this); } } }
ProtocolKeyword
Kami menggunakan corak reka bentuk pembina di atas untuk meletakkan semua parameter Semua ditukar ke dalam kelas SetOpts, dan pembangun boleh mengawal parameter dalam arahan secara fleksibel melalui pembinaan objek SetOpts. 3. Kita perlu menukar objek data yang berbeza di bahagian ketiga kepada jenis yang berbeza:
Jenis data POINT
Medan utama Point ialah longitud dan latitud, dalam Selain itu, terdapat medan tambahan
, yang digunakan untuk menyimpan parameter perniagaan tambahan dan boleh kosong.public class Point extends Element implements Serializable { // 经度 private double lng; // 维度 private double lat; // 额外的数据 private double z; public Point(double lng, double lat, double z) { this.lat = lat; this.lng = lng; this.z = z; } public Point(double lng, double lat) { this(lng, lat, Integer.MIN_VALUE); } @Override public List<String> commandArgs() { List<String> result = new LinkedList<>(); result.add("POINT"); result.add(String.valueOf(this.lng)); result.add(String.valueOf(this.lat)); if (this.z != Integer.MIN_VALUE) { result.add(String.valueOf(this.z)); } return result; } }
z
BOUNDS ialah segi empat tepat, dan medan utamanya ialah sudut kiri bawah dan sudut kanan atas Kami menggunakan koordinat1 dan koordinat2 untuk mewakili sudut kiri bawah dan sudut kanan atas ;
@AllArgsConstructor public class Bounds extends Element { private double[] coordinate1; private double[] coordinate2; @Override public List<String> commandArgs() { List<String> result = new LinkedList<>(); result.add("BOUNDS"); result.add(String.valueOf(coordinate1[0])); result.add(String.valueOf(coordinate1[1])); result.add(String.valueOf(coordinate2[0])); result.add(String.valueOf(coordinate2[1])); return result; } }
HASH dan STRING sebenarnya adalah rentetan yang berasingan, tetapi kami masih merangkumkannya untuk digunakan oleh pembangun;
@AllArgsConstructor public class Geohash extends Element { private String hash; @Override public List<String> commandArgs() { List<String> result = new LinkedList<>(); result.add("HASH"); result.add(this.hash); return result; } } @AllArgsConstructor public class RawString extends Element { private String raw; @Override public List<String> commandArgs() { List<String> result = new LinkedList<>(); result.add("STRING"); result.add(this.raw); return result; } }
OBJEK sebenarnya adalah data GeoJSON. Jenis data ini lebih rumit. Terdapat enam jenis secara keseluruhannya. pembangun untuk Untuk menggunakan enam jenis ini dengan lebih baik, kami juga menggunakan corak pembina untuk mereka bentuk jenis data GeoJSON:
Point, LineString, Polygon, MultiPoint, MultiLineString, MultiPolygon
Berikut ialah kod enam pembina Setiap objek dibina berdasarkan BaseGeoJson yang paling asas Jenis medan awam dan medan meta tambahan diekstrak daripada BaseGeoJson. Bilangan dan tahap mata adalah berbeza, jadi mengikut ciri setiap jenis, reka bentuk kod adalah seperti berikut:
@Data public class GeoJson { public static class Builder { public Point.Builder point() { return new Point.Builder(); } public MultiPoint.Builder multPoint() { return new MultiPoint.Builder(); } public LineString.Builder lineString() { return new LineString.Builder(); } public MultiLineString.Builder multiLineString() { return new MultiLineString.Builder(); } public Polygon.Builder polygon() { return new Polygon.Builder(); } public MultiPolygon.Builder multiPolygon() { return new MultiPolygon.Builder(); } } }
Akhir sekali, tambahkan Elemen kelas asas:
// Point类型 public static class Point extends BaseGeoJson { // 坐标点 private double[] coordinates; Point(Builder builder) { super(builder); this.type = GeoJsonType.Point; this.coordinates = builder.coordinates; } @Override protected Object coordinates() { return this.coordinates; } public static class Builder extends BaseGeoJson.Builder { private double[] coordinates; public Builder coordinate(double lon, double lat) { coordinates = new double[]{lat, lon}; return this; } public Point build() { return new Point(this); } } } // MultiPoint类型 public static class MultiPoint extends BaseGeoJson { private double[][] coordinates; MultiPoint(Builder builder) { super(builder); this.type = GeoJsonType.MultiPoint; this.coordinates = builder.convert2Array(); } @Override protected Object coordinates() { return this.coordinates; } public static class Builder extends BaseGeoJson.Builder { private List<Coordinate> coordinates; public Builder coordinate(double lon, double lat) { if (CollectionUtils.isEmpty(this.coordinates)) { this.coordinates = new LinkedList<>(); } this.coordinates.add(new Coordinate(lat, lon)); return this; } protected double[][] convert2Array() { int length = this.coordinates.size(); double[][] result = new double[length][]; for (int i = 0; i < length; i++) { result[i] = this.coordinates.get(i).convertToArray(); } return result; } @Override public MultiPoint build() { return new MultiPoint(this); } } } // LineString类型 public static class LineString extends MultiPoint { private double[][] coordinates; LineString(Builder builder) { super(builder); this.type = GeoJsonType.LineString; } public static class Builder extends MultiPoint.Builder { @Override public LineString build() { return new LineString(this); } } } // MultiLineString类型 public static class MultiLineString extends BaseGeoJson { private double[][][] coordinates; MultiLineString(Builder builder) { super(builder); this.type = GeoJsonType.MultiLineString; this.coordinates = builder.convertToArray(); } @Override protected Object coordinates() { return this.coordinates; } public static class Builder extends BaseGeoJson.Builder { private List<Line> lines = new LinkedList<>(); public Line line() { return new Line(this); } void addLine(Line line) { lines.add(line); } double[][][] convertToArray() { int length = this.lines.size(); double[][][] result = new double[length][][]; for (int i = 0; i < length; i++) { Line line = this.lines.get(i); result[i] = line.convert2Array(); } return result; } @Override public BaseGeoJson build() { return new MultiLineString(this); } } static class Line { private List<Coordinate> coordinates; private Builder builder; Line(Builder builder) { this.builder = builder; this.builder.addLine(this); } private double[][] convert2Array() { int length = this.coordinates.size(); double[][] result = new double[length][]; for (int i = 0; i < length; i++) { result[i] = this.coordinates.get(i).convertToArray(); } return result; } public Line coordinate(double lon, double lat) { if (CollectionUtils.isEmpty(this.coordinates)) { this.coordinates = new LinkedList<>(); } this.coordinates.add(new Coordinate(lat, lon)); return this; } public Line nextLine() { return new Line(this.builder); } public Builder end() { return this.builder; } } } // Polygon类型 public static class Polygon extends MultiPoint { private double[][][] coordinates; Polygon(Builder builder) { super(builder); this.type = GeoJsonType.Polygon; this.coordinates = new double[][][]{builder.convert2Array()}; } public static class Builder extends MultiPoint.Builder { @Override public Polygon build() { return new Polygon(this); } } } // MultiPolygon类型 public static class MultiPolygon extends BaseGeoJson { private double[][][][] coordinates; MultiPolygon(Builder builder) { super(builder); this.type = GeoJsonType.MultiPolygon; this.coordinates = new double[][][][]{builder.convert2Array()}; } @Override protected Object coordinates() { return this.coordinates; } public static class Builder extends BaseGeoJson.Builder { private List<Polygon> polygons = new LinkedList<>(); @Override public BaseGeoJson build() { return new MultiPolygon(this); } void addPolygon(Polygon polygon) { polygons.add(polygon); } private double[][][] convert2Array() { int length = this.polygons.size(); double[][][] result = new double[length][][]; for (int i = 0; i < length; i++) { result[i] = this.polygons.get(i).convert2Array(); } return result; } } static class Polygon { private List<Coordinate> coordinates; private Builder builder; Polygon(Builder builder) { this.builder = builder; this.builder.addPolygon(this); } private double[][] convert2Array() { int length = this.coordinates.size(); double[][] result = new double[length][]; for (int i = 0; i < length; i++) { result[i] = this.coordinates.get(i).convertToArray(); } return result; } public Polygon coordinate(double lon, double lat) { if (CollectionUtils.isEmpty(this.coordinates)) { this.coordinates = new LinkedList<>(); } this.coordinates.add(new Coordinate(lat, lon)); return this; } public Polygon nextLine() { return new Polygon(this.builder); } public Builder end() { return this.builder; } } } // 基类BaseGeoJson public abstract static class BaseGeoJson extends Element { // 公共字段type protected GeoJsonType type; // 公共字段metadata private Map<String, String> metadata; BaseGeoJson(Builder builder) { this.metadata = builder.metadata; } protected abstract Object coordinates(); // 转换成命令参数 @Override public List<String> commandArgs() { List<String> result = new LinkedList<>(); result.add("OBJECT"); result.add(toJson()); return result; } // 提供统一的转json方法 protected String toJson() { Map<String, Object> map = new LinkedHashMap<>(); map.put("type", this.type); map.put("coordinates", coordinates()); if (!CollectionUtils.isEmpty(this.metadata)) { for (Map.Entry<String, String> entry : this.metadata.entrySet()) { map.put(entry.getKey(), entry.getValue()); } } return JsonUtil.obj2String(map); } abstract static class Builder { private Map<String, String> metadata; public Builder meta(String key, String value) { if (MapUtils.isEmpty(this.metadata)) { this.metadata = new LinkedHashMap<>(); } this.metadata.put(key, value); return this; } public abstract BaseGeoJson build(); } static class Coordinate { private double lat; private double lon; Coordinate(double lat, double lon) { this.lat = lat; this.lon = lon; } public double[] convertToArray() { return new double[]{this.lat, this.lon}; } } // GeoJSON所有的数据类型 enum GeoJsonType { Point, LineString, Polygon, MultiPoint, MultiLineString, MultiPolygon } }
Cara menggunakan
Kami Semua jenis data ditukar kepada reka bentuk kod tertentu. Mari lihat cara menggunakannya:
public abstract class Element implements Serializable { public abstract List<String> commandArgs(); }
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