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flatbuffers/tests/JavaTest.java

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/*
* 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 NamespaceA.*;
import NamespaceA.NamespaceB.*;
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);
int[] names = {fbb.createString("Frodo"), fbb.createString("Barney"), fbb.createString("Wilma")};
int[] off = new int[3];
Monster.startMonster(fbb);
Monster.addName(fbb, names[0]);
off[0] = Monster.endMonster(fbb);
Monster.startMonster(fbb);
Monster.addName(fbb, names[1]);
off[1] = Monster.endMonster(fbb);
Monster.startMonster(fbb);
Monster.addName(fbb, names[2]);
off[2] = Monster.endMonster(fbb);
int sortMons = fbb.createSortedVectorOfTables(new Monster(), off);
// 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);
Monster.addTestarrayoftables(fbb, sortMons);
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);
// Accessing a vector of sorted by the key tables
TestEq(monster.testarrayoftables(0).name(), "Barney");
TestEq(monster.testarrayoftables(1).name(), "Frodo");
TestEq(monster.testarrayoftables(2).name(), "Wilma");
// Example of searching for a table by the key
TestEq(Monster.lookupByKey(sortMons, "Frodo", fbb.dataBuffer()).name(), "Frodo");
TestEq(Monster.lookupByKey(sortMons, "Barney", fbb.dataBuffer()).name(), "Barney");
TestEq(Monster.lookupByKey(sortMons, "Wilma", fbb.dataBuffer()).name(), "Wilma");
// 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());
TestNamespaceNesting();
TestNestedFlatBuffer();
TestCreateByteVector();
TestCreateUninitializedVector();
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 TestNamespaceNesting() {
// reference / manipulate these to verify compilation
FlatBufferBuilder fbb = new FlatBufferBuilder(1);
TableInNestedNS.startTableInNestedNS(fbb);
TableInNestedNS.addFoo(fbb, 1234);
int nestedTableOff = TableInNestedNS.endTableInNestedNS(fbb);
TableInFirstNS.startTableInFirstNS(fbb);
TableInFirstNS.addFooTable(fbb, nestedTableOff);
int off = TableInFirstNS.endTableInFirstNS(fbb);
}
static void TestNestedFlatBuffer() {
final String nestedMonsterName = "NestedMonsterName";
final short nestedMonsterHp = 600;
final short nestedMonsterMana = 1024;
FlatBufferBuilder fbb1 = new FlatBufferBuilder(16);
int str1 = fbb1.createString(nestedMonsterName);
Monster.startMonster(fbb1);
Monster.addName(fbb1, str1);
Monster.addHp(fbb1, nestedMonsterHp);
Monster.addMana(fbb1, nestedMonsterMana);
int monster1 = Monster.endMonster(fbb1);
Monster.finishMonsterBuffer(fbb1, monster1);
byte[] fbb1Bytes = fbb1.sizedByteArray();
fbb1 = null;
FlatBufferBuilder fbb2 = new FlatBufferBuilder(16);
int str2 = fbb2.createString("My Monster");
int nestedBuffer = Monster.createTestnestedflatbufferVector(fbb2, fbb1Bytes);
Monster.startMonster(fbb2);
Monster.addName(fbb2, str2);
Monster.addHp(fbb2, (short)50);
Monster.addMana(fbb2, (short)32);
Monster.addTestnestedflatbuffer(fbb2, nestedBuffer);
int monster = Monster.endMonster(fbb2);
Monster.finishMonsterBuffer(fbb2, monster);
// Now test the data extracted from the nested buffer
Monster mons = Monster.getRootAsMonster(fbb2.dataBuffer());
Monster nestedMonster = mons.testnestedflatbufferAsMonster();
TestEq(nestedMonsterMana, nestedMonster.mana());
TestEq(nestedMonsterHp, nestedMonster.hp());
TestEq(nestedMonsterName, nestedMonster.name());
}
static void TestCreateByteVector() {
FlatBufferBuilder fbb = new FlatBufferBuilder(16);
int str = fbb.createString("MyMonster");
byte[] inventory = new byte[] { 0, 1, 2, 3, 4 };
int vec = fbb.createByteVector(inventory);
Monster.startMonster(fbb);
Monster.addInventory(fbb, vec);
Monster.addName(fbb, str);
int monster1 = Monster.endMonster(fbb);
Monster.finishMonsterBuffer(fbb, monster1);
Monster monsterObject = Monster.getRootAsMonster(fbb.dataBuffer());
TestEq(monsterObject.inventory(1), (int)inventory[1]);
TestEq(monsterObject.inventoryLength(), inventory.length);
TestEq(ByteBuffer.wrap(inventory), monsterObject.inventoryAsByteBuffer());
}
static void TestCreateUninitializedVector() {
FlatBufferBuilder fbb = new FlatBufferBuilder(16);
int str = fbb.createString("MyMonster");
byte[] inventory = new byte[] { 0, 1, 2, 3, 4 };
ByteBuffer bb = fbb.createUnintializedVector(1, inventory.length, 1);
for (byte i:inventory) {
bb.put(i);
}
int vec = fbb.endVector();
Monster.startMonster(fbb);
Monster.addInventory(fbb, vec);
Monster.addName(fbb, str);
int monster1 = Monster.endMonster(fbb);
Monster.finishMonsterBuffer(fbb, monster1);
Monster monsterObject = Monster.getRootAsMonster(fbb.dataBuffer());
TestEq(monsterObject.inventory(1), (int)inventory[1]);
TestEq(monsterObject.inventoryLength(), inventory.length);
TestEq(ByteBuffer.wrap(inventory), monsterObject.inventoryAsByteBuffer());
}
static <T> 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);
}
}
}
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