/* * Copyright 2014 Google Inc. All rights reserved. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.io.*; import java.nio.ByteBuffer; import MyGame.Example.*; import com.google.flatbuffers.FlatBufferBuilder; class JavaTest { public static void main(String[] args) { // First, let's test reading a FlatBuffer generated by C++ code: // This file was generated from monsterdata_test.json byte[] data = null; File file = new File("monsterdata_test.mon"); RandomAccessFile f = null; try { f = new RandomAccessFile(file, "r"); data = new byte[(int)f.length()]; f.readFully(data); f.close(); } catch(java.io.IOException e) { System.out.println("FlatBuffers test: couldn't read file"); return; } // Now test it: ByteBuffer bb = ByteBuffer.wrap(data); TestBuffer(bb); // Second, let's create a FlatBuffer from scratch in Java, and test it also. // We use an initial size of 1 to exercise the reallocation algorithm, // normally a size larger than the typical FlatBuffer you generate would be // better for performance. FlatBufferBuilder fbb = new FlatBufferBuilder(1); // We set up the same values as monsterdata.json: int str = fbb.createString("MyMonster"); int inv = Monster.createInventoryVector(fbb, new byte[] { 0, 1, 2, 3, 4 }); int fred = fbb.createString("Fred"); Monster.startMonster(fbb); Monster.addName(fbb, fred); int mon2 = Monster.endMonster(fbb); Monster.startTest4Vector(fbb, 2); Test.createTest(fbb, (short)10, (byte)20); Test.createTest(fbb, (short)30, (byte)40); int test4 = fbb.endVector(); int testArrayOfString = Monster.createTestarrayofstringVector(fbb, new int[] { fbb.createString("test1"), fbb.createString("test2") }); Monster.startMonster(fbb); Monster.addPos(fbb, Vec3.createVec3(fbb, 1.0f, 2.0f, 3.0f, 3.0, Color.Green, (short)5, (byte)6)); Monster.addHp(fbb, (short)80); Monster.addName(fbb, str); Monster.addInventory(fbb, inv); Monster.addTestType(fbb, (byte)Any.Monster); Monster.addTest(fbb, mon2); Monster.addTest4(fbb, test4); Monster.addTestarrayofstring(fbb, testArrayOfString); Monster.addTestbool(fbb, false); Monster.addTesthashu32Fnv1(fbb, Integer.MAX_VALUE + 1L); int mon = Monster.endMonster(fbb); Monster.finishMonsterBuffer(fbb, mon); // Write the result to a file for debugging purposes: // Note that the binaries are not necessarily identical, since the JSON // parser may serialize in a slightly different order than the above // Java code. They are functionally equivalent though. try { DataOutputStream os = new DataOutputStream(new FileOutputStream( "monsterdata_java_wire.mon")); os.write(fbb.dataBuffer().array(), fbb.dataBuffer().position(), fbb.offset()); os.close(); } catch(java.io.IOException e) { System.out.println("FlatBuffers test: couldn't write file"); return; } // Test it: TestExtendedBuffer(fbb.dataBuffer()); // Make sure it also works with read only ByteBuffers. This is slower, // since creating strings incurs an additional copy // (see Table.__string). TestExtendedBuffer(fbb.dataBuffer().asReadOnlyBuffer()); TestEnums(); //Attempt to mutate Monster fields and check whether the buffer has been mutated properly // revert to original values after testing Monster monster = Monster.getRootAsMonster(fbb.dataBuffer()); // mana is optional and does not exist in the buffer so the mutation should fail // the mana field should retain its default value TestEq(monster.mutateMana((short)10), false); TestEq(monster.mana(), (short)150); // testType is an existing field and mutating it should succeed TestEq(monster.testType(), (byte)Any.Monster); TestEq(monster.mutateTestType(Any.NONE), true); TestEq(monster.testType(), (byte)Any.NONE); TestEq(monster.mutateTestType(Any.Monster), true); TestEq(monster.testType(), (byte)Any.Monster); //mutate the inventory vector TestEq(monster.mutateInventory(0, 1), true); TestEq(monster.mutateInventory(1, 2), true); TestEq(monster.mutateInventory(2, 3), true); TestEq(monster.mutateInventory(3, 4), true); TestEq(monster.mutateInventory(4, 5), true); for (int i = 0; i < monster.inventoryLength(); i++) { TestEq(monster.inventory(i), i + 1); } //reverse mutation TestEq(monster.mutateInventory(0, 0), true); TestEq(monster.mutateInventory(1, 1), true); TestEq(monster.mutateInventory(2, 2), true); TestEq(monster.mutateInventory(3, 3), true); TestEq(monster.mutateInventory(4, 4), true); // get a struct field and edit one of its fields Vec3 pos = monster.pos(); TestEq(pos.x(), 1.0f); pos.mutateX(55.0f); TestEq(pos.x(), 55.0f); pos.mutateX(1.0f); TestEq(pos.x(), 1.0f); TestExtendedBuffer(fbb.dataBuffer().asReadOnlyBuffer()); System.out.println("FlatBuffers test: completed successfully"); } static void TestEnums() { TestEq(Color.name(Color.Red), "Red"); TestEq(Color.name(Color.Blue), "Blue"); TestEq(Any.name(Any.NONE), "NONE"); TestEq(Any.name(Any.Monster), "Monster"); } static void TestBuffer(ByteBuffer bb) { TestEq(Monster.MonsterBufferHasIdentifier(bb), true); Monster monster = Monster.getRootAsMonster(bb); TestEq(monster.hp(), (short)80); TestEq(monster.mana(), (short)150); // default TestEq(monster.name(), "MyMonster"); // monster.friendly() // can't access, deprecated Vec3 pos = monster.pos(); TestEq(pos.x(), 1.0f); TestEq(pos.y(), 2.0f); TestEq(pos.z(), 3.0f); TestEq(pos.test1(), 3.0); TestEq(pos.test2(), Color.Green); Test t = pos.test3(); TestEq(t.a(), (short)5); TestEq(t.b(), (byte)6); TestEq(monster.testType(), (byte)Any.Monster); Monster monster2 = new Monster(); TestEq(monster.test(monster2) != null, true); TestEq(monster2.name(), "Fred"); TestEq(monster.inventoryLength(), 5); int invsum = 0; for (int i = 0; i < monster.inventoryLength(); i++) invsum += monster.inventory(i); TestEq(invsum, 10); // Alternative way of accessing a vector: ByteBuffer ibb = monster.inventoryAsByteBuffer(); invsum = 0; while (ibb.position() < ibb.limit()) invsum += ibb.get(); TestEq(invsum, 10); Test test_0 = monster.test4(0); Test test_1 = monster.test4(1); TestEq(monster.test4Length(), 2); TestEq(test_0.a() + test_0.b() + test_1.a() + test_1.b(), 100); TestEq(monster.testarrayofstringLength(), 2); TestEq(monster.testarrayofstring(0),"test1"); TestEq(monster.testarrayofstring(1),"test2"); TestEq(monster.testbool(), false); } // this method checks additional fields not present in the binary buffer read from file // these new tests are performed on top of the regular tests static void TestExtendedBuffer(ByteBuffer bb) { TestBuffer(bb); Monster monster = Monster.getRootAsMonster(bb); TestEq(monster.testhashu32Fnv1(), Integer.MAX_VALUE + 1L); } static void TestEq(T a, T b) { if (!a.equals(b)) { System.out.println("" + a.getClass().getName() + " " + b.getClass().getName()); System.out.println("FlatBuffers test FAILED: \'" + a + "\' != \'" + b + "\'"); assert false; System.exit(1); } } }