Also added new constructor that allows ByteBuffer reuse.
Change-Id: I9c20ea96c67533066461f4e23b0d03b9b47cd068
Tested: on OS X.
int space; // Remaining space in the ByteBuffer.
static final Charset utf8charset = Charset.forName("UTF-8");
int minalign = 1; // Minimum alignment encountered so far.
- int[] vtable; // The vtable for the current table, null otherwise.
+ int[] vtable = null; // The vtable for the current table, null otherwise.
int object_start; // Starting offset of the current struct/table.
int[] vtables = new int[16]; // List of offsets of all vtables.
int num_vtables = 0; // Number of entries in `vtables` in use.
bb = newByteBuffer(new byte[initial_size]);
}
+ // Alternative constructor allowing reuse of ByteBuffers
+ public FlatBufferBuilder(ByteBuffer existing_bb) {
+ bb = existing_bb;
+ bb.clear();
+ bb.order(ByteOrder.LITTLE_ENDIAN);
+ space = bb.capacity();
+ }
+
ByteBuffer newByteBuffer(byte[] buf) {
ByteBuffer newbb = ByteBuffer.wrap(buf);
newbb.order(ByteOrder.LITTLE_ENDIAN);
// Create a java String from UTF-8 data stored inside the flatbuffer.
protected String __string(int offset) {
offset += bb.getInt(offset);
- return new String(bb.array(), offset + SIZEOF_INT, bb.getInt(offset), Charset.forName("UTF-8"));
+ if (bb.hasArray()) {
+ return new String(bb.array(), offset + SIZEOF_INT, bb.getInt(offset), Charset.forName("UTF-8"));
+ } else {
+ // We can't access .array(), since the ByteBuffer is read-only.
+ // We're forced to make an extra copy:
+ bb.position(offset + SIZEOF_INT);
+ byte[] copy = new byte[bb.getInt(offset)];
+ bb.get(copy);
+ bb.position(0);
+ return new String(copy, 0, copy.length, Charset.forName("UTF-8"));
+ }
}
// Get the length of a vector whose offset is stored at "offset" in this object.
}
// Test it:
-
TestBuffer(fbb.dataBuffer(), fbb.dataStart());
+ // 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());
+
System.out.println("FlatBuffers test: completed successfully");
}