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Implemented the file identifier functionality for Java.

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Also fixed flatc not outputting these identifiers for files
compiled on the command-line.

Bug: 16983987
Change-Id: I8b714cfea3a8e144fa52133f62b2f7eda6eb044a
Tested: on Linux
This commit is contained in:
Wouter van Oortmerssen
2014-09-04 16:31:44 -07:00
parent 96592d5dbb
commit 09a2999c66
16 changed files with 113 additions and 17 deletions
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17
java/flatbuffers/FlatBufferBuilder.java
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@@ -25,7 +25,7 @@ import java.nio.charset.Charset;
// Class that helps you build a FlatBuffer.
// See the section "Use in Java" in the main FlatBuffers documentation.
public class FlatBufferBuilder {
public class FlatBufferBuilder extends Constants {
ByteBuffer bb; // Where we construct the FlatBuffer.
int space; // Remaining space in the ByteBuffer.
static final Charset utf8charset = Charset.forName("UTF-8");
@@ -36,10 +36,6 @@ public class FlatBufferBuilder {
int num_vtables = 0; // Number of entries in `vtables` in use.
int vector_num_elems = 0; // For the current vector being built.
// Java doesn't seem to have these.
final int SIZEOF_SHORT = 2;
final int SIZEOF_INT = 4;
// Start with a buffer of size `initial_size`, then grow as required.
public FlatBufferBuilder(int initial_size) {
if (initial_size <= 0) initial_size = 1;
@@ -251,6 +247,17 @@ public class FlatBufferBuilder {
addOffset(root_table);
}
public void finish(int root_table, String file_identifier) {
prep(minalign, SIZEOF_INT + FILE_IDENTIFIER_LENGTH);
if (file_identifier.length() != FILE_IDENTIFIER_LENGTH)
throw new AssertionError("FlatBuffers: file identifier must be length " +
FILE_IDENTIFIER_LENGTH);
for (int i = FILE_IDENTIFIER_LENGTH - 1; i >= 0; i--) {
addByte((byte)file_identifier.charAt(i));
}
addOffset(root_table);
}
public ByteBuffer dataBuffer() { return bb; }
// The FlatBuffer data doesn't start at offset 0 in the ByteBuffer: