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Added accessor in Java to get vectors as ByteBuffers.

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Also cleaned up ByteBuffer usage in general: ByteBuffer.position
now universally indicates the start of a ByteBuffer.

Change-Id: Ic4bfb98f9df9501b8fc82de2c45db7d7311135ac
Tested: on Linux.
This commit is contained in:
Wouter van Oortmerssen
2014-09-10 16:38:37 -07:00
parent 32f2c1c3b9
commit 858e9961e2
7 changed files with 93 additions and 33 deletions
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21
tests/JavaTest.java
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@@ -41,7 +41,7 @@ class JavaTest {
// Now test it:
ByteBuffer bb = ByteBuffer.wrap(data);
TestBuffer(bb, 0);
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,
@@ -95,7 +95,7 @@ class JavaTest {
try {
DataOutputStream os = new DataOutputStream(new FileOutputStream(
"monsterdata_java_wire.bin"));
os.write(fbb.dataBuffer().array(), fbb.dataStart(), fbb.offset());
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");
@@ -103,20 +103,20 @@ class JavaTest {
}
// Test it:
TestBuffer(fbb.dataBuffer(), fbb.dataStart());
TestBuffer(fbb.dataBuffer());
// Make sure it also works with read only ByteBuffers. This is slower,
// since creating strings incurs an additional copy
// (see Table.__string).
TestBuffer(fbb.dataBuffer().asReadOnlyBuffer(), fbb.dataStart());
TestBuffer(fbb.dataBuffer().asReadOnlyBuffer());
System.out.println("FlatBuffers test: completed successfully");
}
static void TestBuffer(ByteBuffer bb, int start) {
TestEq(Monster.MonsterBufferHasIdentifier(bb, start), true);
static void TestBuffer(ByteBuffer bb) {
TestEq(Monster.MonsterBufferHasIdentifier(bb), true);
Monster monster = Monster.getRootAsMonster(bb, start);
Monster monster = Monster.getRootAsMonster(bb);
TestEq(monster.hp(), (short)80);
TestEq(monster.mana(), (short)150); // default
@@ -145,6 +145,13 @@ class JavaTest {
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);