eugenp · maibin · Feb 26, 2024 · Feb 25, 2024
diff --git a/libraries-data-io-2/pom.xml b/libraries-data-io-2/pom.xml
@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <artifactId>libraries-data-io-2</artifactId>
+    <name>libraries-data-io-3</name>
+
+    <properties>
+        <maven.compiler.source>19</maven.compiler.source>
+        <maven.compiler.target>19</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <google-flatbuffers.version>23.5.26</google-flatbuffers.version>
+    </properties>
+    <dependencies>
+        <dependency>
+            <groupId>com.google.flatbuffers</groupId>
+            <artifactId>flatbuffers-java</artifactId>
+            <version>${google-flatbuffers.version}</version>
+        </dependency>
+    </dependencies>
+
+</project>
diff --git a/libraries-data-io-2/src/main/java/com/baeldung/flatbuffers/MyGame/terrains/Color.java b/libraries-data-io-2/src/main/java/com/baeldung/flatbuffers/MyGame/terrains/Color.java
@@ -0,0 +1,18 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+package MyGame.terrains;
+
+@SuppressWarnings("unused")
+public final class Color {
+  private Color() { }
+  public static final byte Brown = 0;
+  public static final byte Red = 1;
+  public static final byte Green = 2;
+  public static final byte Blue = 3;
+  public static final byte White = 4;
+
+  public static final String[] names = { "Brown", "Red", "Green", "Blue", "White", };
+
+  public static String name(int e) { return names[e]; }
+}
+
diff --git a/libraries-data-io-2/src/main/java/com/baeldung/flatbuffers/MyGame/terrains/Effect.java b/libraries-data-io-2/src/main/java/com/baeldung/flatbuffers/MyGame/terrains/Effect.java
@@ -0,0 +1,51 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+package MyGame.terrains;
+
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+
+import com.google.flatbuffers.BaseVector;
+import com.google.flatbuffers.Constants;
+import com.google.flatbuffers.FlatBufferBuilder;
+import com.google.flatbuffers.Table;
+
+@SuppressWarnings("unused")
+public final class Effect extends Table {
+  public static void ValidateVersion() { Constants.FLATBUFFERS_23_5_26(); }
+  public static Effect getRootAsEffect(ByteBuffer _bb) { return getRootAsEffect(_bb, new Effect()); }
+  public static Effect getRootAsEffect(ByteBuffer _bb, Effect obj) { _bb.order(ByteOrder.LITTLE_ENDIAN); return (obj.__assign(_bb.getInt(_bb.position()) + _bb.position(), _bb)); }
+  public void __init(int _i, ByteBuffer _bb) { __reset(_i, _bb); }
+  public Effect __assign(int _i, ByteBuffer _bb) { __init(_i, _bb); return this; }
+
+  public String name() { int o = __offset(4); return o != 0 ? __string(o + bb_pos) : null; }
+  public ByteBuffer nameAsByteBuffer() { return __vector_as_bytebuffer(4, 1); }
+  public ByteBuffer nameInByteBuffer(ByteBuffer _bb) { return __vector_in_bytebuffer(_bb, 4, 1); }
+  public short damage() { int o = __offset(6); return o != 0 ? bb.getShort(o + bb_pos) : 0; }
+  public boolean mutateDamage(short damage) { int o = __offset(6); if (o != 0) { bb.putShort(o + bb_pos, damage); return true; } else { return false; } }
+
+  public static int createEffect(FlatBufferBuilder builder,
+      int nameOffset,
+      short damage) {
+    builder.startTable(2);
+    Effect.addName(builder, nameOffset);
+    Effect.addDamage(builder, damage);
+    return Effect.endEffect(builder);
+  }
+
+  public static void startEffect(FlatBufferBuilder builder) { builder.startTable(2); }
+  public static void addName(FlatBufferBuilder builder, int nameOffset) { builder.addOffset(0, nameOffset, 0); }
+  public static void addDamage(FlatBufferBuilder builder, short damage) { builder.addShort(1, damage, 0); }
+  public static int endEffect(FlatBufferBuilder builder) {
+    int o = builder.endTable();
+    return o;
+  }
+
+  public static final class Vector extends BaseVector {
+    public Vector __assign(int _vector, int _element_size, ByteBuffer _bb) { __reset(_vector, _element_size, _bb); return this; }
+
+    public Effect get(int j) { return get(new Effect(), j); }
+    public Effect get(Effect obj, int j) {  return obj.__assign(__indirect(__element(j), bb), bb); }
+  }
+}
+
diff --git a/libraries-data-io-2/src/main/java/com/baeldung/flatbuffers/MyGame/terrains/Terrain.java b/libraries-data-io-2/src/main/java/com/baeldung/flatbuffers/MyGame/terrains/Terrain.java
@@ -0,0 +1,59 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+package MyGame.terrains;
+
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+
+import com.google.flatbuffers.BaseVector;
+import com.google.flatbuffers.Constants;
+import com.google.flatbuffers.FlatBufferBuilder;
+import com.google.flatbuffers.Table;
+
+@SuppressWarnings("unused")
+public final class Terrain extends Table {
+  public static void ValidateVersion() { Constants.FLATBUFFERS_23_5_26(); }
+  public static Terrain getRootAsTerrain(ByteBuffer _bb) { return getRootAsTerrain(_bb, new Terrain()); }
+  public static Terrain getRootAsTerrain(ByteBuffer _bb, Terrain obj) { _bb.order(ByteOrder.LITTLE_ENDIAN); return (obj.__assign(_bb.getInt(_bb.position()) + _bb.position(), _bb)); }
+  public void __init(int _i, ByteBuffer _bb) { __reset(_i, _bb); }
+  public Terrain __assign(int _i, ByteBuffer _bb) { __init(_i, _bb); return this; }
+
+  public MyGame.terrains.Vec3 pos() { return pos(new MyGame.terrains.Vec3()); }
+  public MyGame.terrains.Vec3 pos(MyGame.terrains.Vec3 obj) { int o = __offset(4); return o != 0 ? obj.__assign(o + bb_pos, bb) : null; }
+  public String name() { int o = __offset(6); return o != 0 ? __string(o + bb_pos) : null; }
+  public ByteBuffer nameAsByteBuffer() { return __vector_as_bytebuffer(6, 1); }
+  public ByteBuffer nameInByteBuffer(ByteBuffer _bb) { return __vector_in_bytebuffer(_bb, 6, 1); }
+  public byte color() { int o = __offset(8); return o != 0 ? bb.get(o + bb_pos) : 3; }
+  public boolean mutateColor(byte color) { int o = __offset(8); if (o != 0) { bb.put(o + bb_pos, color); return true; } else { return false; } }
+  public String navigation() { int o = __offset(10); return o != 0 ? __string(o + bb_pos) : null; }
+  public ByteBuffer navigationAsByteBuffer() { return __vector_as_bytebuffer(10, 1); }
+  public ByteBuffer navigationInByteBuffer(ByteBuffer _bb) { return __vector_in_bytebuffer(_bb, 10, 1); }
+  public MyGame.terrains.Effect effects(int j) { return effects(new MyGame.terrains.Effect(), j); }
+  public MyGame.terrains.Effect effects(MyGame.terrains.Effect obj, int j) { int o = __offset(12); return o != 0 ? obj.__assign(__indirect(__vector(o) + j * 4), bb) : null; }
+  public int effectsLength() { int o = __offset(12); return o != 0 ? __vector_len(o) : 0; }
+  public MyGame.terrains.Effect.Vector effectsVector() { return effectsVector(new MyGame.terrains.Effect.Vector()); }
+  public MyGame.terrains.Effect.Vector effectsVector(MyGame.terrains.Effect.Vector obj) { int o = __offset(12); return o != 0 ? obj.__assign(__vector(o), 4, bb) : null; }
+
+  public static void startTerrain(FlatBufferBuilder builder) { builder.startTable(5); }
+  public static void addPos(FlatBufferBuilder builder, int posOffset) { builder.addStruct(0, posOffset, 0); }
+  public static void addName(FlatBufferBuilder builder, int nameOffset) { builder.addOffset(1, nameOffset, 0); }
+  public static void addColor(FlatBufferBuilder builder, byte color) { builder.addByte(2, color, 3); }
+  public static void addNavigation(FlatBufferBuilder builder, int navigationOffset) { builder.addOffset(3, navigationOffset, 0); }
+  public static void addEffects(FlatBufferBuilder builder, int effectsOffset) { builder.addOffset(4, effectsOffset, 0); }
+  public static int createEffectsVector(FlatBufferBuilder builder, int[] data) { builder.startVector(4, data.length, 4); for (int i = data.length - 1; i >= 0; i--) builder.addOffset(data[i]); return builder.endVector(); }
+  public static void startEffectsVector(FlatBufferBuilder builder, int numElems) { builder.startVector(4, numElems, 4); }
+  public static int endTerrain(FlatBufferBuilder builder) {
+    int o = builder.endTable();
+    return o;
+  }
+  public static void finishTerrainBuffer(FlatBufferBuilder builder, int offset) { builder.finish(offset); }
+  public static void finishSizePrefixedTerrainBuffer(FlatBufferBuilder builder, int offset) { builder.finishSizePrefixed(offset); }
+
+  public static final class Vector extends BaseVector {
+    public Vector __assign(int _vector, int _element_size, ByteBuffer _bb) { __reset(_vector, _element_size, _bb); return this; }
+
+    public Terrain get(int j) { return get(new Terrain(), j); }
+    public Terrain get(Terrain obj, int j) {  return obj.__assign(__indirect(__element(j), bb), bb); }
+  }
+}
+
diff --git a/libraries-data-io-2/src/main/java/com/baeldung/flatbuffers/MyGame/terrains/Vec3.java b/libraries-data-io-2/src/main/java/com/baeldung/flatbuffers/MyGame/terrains/Vec3.java
@@ -0,0 +1,38 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+package MyGame.terrains;
+
+import java.nio.ByteBuffer;
+
+import com.google.flatbuffers.BaseVector;
+import com.google.flatbuffers.FlatBufferBuilder;
+import com.google.flatbuffers.Struct;
+
+@SuppressWarnings("unused")
+public final class Vec3 extends Struct {
+  public void __init(int _i, ByteBuffer _bb) { __reset(_i, _bb); }
+  public Vec3 __assign(int _i, ByteBuffer _bb) { __init(_i, _bb); return this; }
+
+  public float x() { return bb.getFloat(bb_pos + 0); }
+  public void mutateX(float x) { bb.putFloat(bb_pos + 0, x); }
+  public float y() { return bb.getFloat(bb_pos + 4); }
+  public void mutateY(float y) { bb.putFloat(bb_pos + 4, y); }
+  public float z() { return bb.getFloat(bb_pos + 8); }
+  public void mutateZ(float z) { bb.putFloat(bb_pos + 8, z); }
+
+  public static int createVec3(FlatBufferBuilder builder, float x, float y, float z) {
+    builder.prep(4, 12);
+    builder.putFloat(z);
+    builder.putFloat(y);
+    builder.putFloat(x);
+    return builder.offset();
+  }
+
+  public static final class Vector extends BaseVector {
+    public Vector __assign(int _vector, int _element_size, ByteBuffer _bb) { __reset(_vector, _element_size, _bb); return this; }
+
+    public Vec3 get(int j) { return get(new Vec3(), j); }
+    public Vec3 get(Vec3 obj, int j) {  return obj.__assign(__element(j), bb); }
+  }
+}
+
diff --git a/libraries-data-io-2/src/main/java/com/baeldung/flatbuffers/MyGameMain.java b/libraries-data-io-2/src/main/java/com/baeldung/flatbuffers/MyGameMain.java
@@ -0,0 +1,61 @@
+package com.baeldung.flatbuffers;
+
+import static MyGame.terrains.Terrain.addColor;
+import static MyGame.terrains.Terrain.addEffects;
+import static MyGame.terrains.Terrain.addNavigation;
+import static MyGame.terrains.Terrain.endTerrain;
+import static MyGame.terrains.Terrain.startTerrain;
+
+import java.nio.ByteBuffer;
+
+import com.google.flatbuffers.FlatBufferBuilder;
+
+import MyGame.terrains.Effect;
+import MyGame.terrains.Terrain;
+
+public class MyGameMain {
+
+    public byte[] serialiseDesertTerrainData() {
+        int INITIAL_BUFFER = 1024;
+        FlatBufferBuilder builder = new FlatBufferBuilder(INITIAL_BUFFER);
+
+        int sandstormOffset = builder.createString("Sandstorm");
+        short damage = 3;
+        int sandStorm = MyGame.terrains.Effect.createEffect(builder, sandstormOffset, damage);
+
+        int droughtOffset = builder.createString("Drought");
+        short damageDrought = 1;
+        int drought = MyGame.terrains.Effect.createEffect(builder, droughtOffset, damageDrought);
+        int[] effects = new int[2];
+        effects[0] = sandStorm;
+        effects[1] = drought;
+
+        byte color = MyGame.terrains.Color.Brown;
+        int terrainName = builder.createString("Desert");
+        int navigationName = builder.createString("south");
+
+        int effectOffset = MyGame.terrains.Terrain.createEffectsVector(builder, effects);
+
+        startTerrain(builder);
+        MyGame.terrains.Terrain.addName(builder, terrainName);
+        addColor(builder, color);
+        addNavigation(builder, navigationName);
+        addEffects(builder, effectOffset);
+        int desert = endTerrain(builder);
+        builder.finish(desert);
+
+        return builder.sizedByteArray();
+    }
+
+    public MyGame.terrains.Terrain deserialiseDataToTerrain(byte[] buffer) {
+        ByteBuffer buf = ByteBuffer.wrap(buffer);
+        return Terrain.getRootAsTerrain(buf);
+    }
+
+    public Effect.Vector deserialiseDataToEffect(byte[] buffer) {
+        ByteBuffer buf = ByteBuffer.wrap(buffer);
+
+        return Terrain.getRootAsTerrain(buf)
+          .effectsVector();
+    }
+}
diff --git a/libraries-data-io-2/src/main/java/com/baeldung/flatbuffers/terrain.fbs b/libraries-data-io-2/src/main/java/com/baeldung/flatbuffers/terrain.fbs
@@ -0,0 +1,25 @@
+
+namespace MyGame.terrains;
+
+enum Color:byte { Brown = 0, Red = 1, Green = 2, Blue = 3, White = 4 }
+
+struct Vec3 {
+  x:float;
+  y:float;
+  z:float;
+}
+
+table Terrain {
+  pos:Vec3; // Struct.
+  name: string;
+  color:Color = Blue;
+  navigation: string;
+  effects: [Effect];
+}
+
+table Effect {
+  name: string;
+  damage: short;
+}
+
+root_type Terrain;
diff --git a/libraries-data-io-2/src/test/java/flatbuffers/FlatBufferGameUnitTest.java b/libraries-data-io-2/src/test/java/flatbuffers/FlatBufferGameUnitTest.java
@@ -0,0 +1,43 @@
+package flatbuffers;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import com.baeldung.flatbuffers.MyGameMain;
+
+import MyGame.terrains.Effect;
+
+public class FlatBufferGameUnitTest {
+
+    @Test
+    public void givenTerrainEffect_whenSerialisedWithValues_returnBytes() {
+        MyGameMain myGame = new MyGameMain();
+        byte[] bytes = myGame.serialiseDesertTerrainData();
+        Assert.assertNotNull(bytes);
+    }
+
+    @Test
+    public void givenSerialisedBytes_whenDeSerialised_returnsTerrain() {
+        MyGameMain myGame = new MyGameMain();
+        byte[] bytes = myGame.serialiseDesertTerrainData();
+
+        MyGame.terrains.Terrain terrain = myGame.deserialiseDataToTerrain(bytes);
+        Assert.assertNotNull(terrain);
+        Assert.assertEquals(terrain.name(), "Desert");
+        Assert.assertEquals(terrain.navigation(), "south");
+        Assert.assertEquals(MyGame.terrains.Color.name(terrain.color()), "Brown");
+    }
+
+    @Test
+    public void givenSerialisedBytes_whenDeSerialised_returnsTerrainEffect() {
+        MyGameMain myGame = new MyGameMain();
+        byte[] bytes = myGame.serialiseDesertTerrainData();
+
+        Effect.Vector effectsVector = myGame.deserialiseDataToEffect(bytes);
+        Assert.assertNotNull(effectsVector);
+        Assert.assertEquals(effectsVector.get(0).name(), "Sandstorm");
+        Assert.assertEquals(effectsVector.get(1).name(), "Drought");
+
+        Assert.assertEquals(effectsVector.get(1).damage(), 1);
+    }
+}
diff --git a/pom.xml b/pom.xml
@@ -8,6 +8,9 @@
     <artifactId>parent-modules</artifactId>
     <version>1.0.0-SNAPSHOT</version>
     <name>parent-modules</name>
+    <modules>
+        <module>libraries-data-io-2</module>
+    </modules>
 
     <packaging>pom</packaging>