BigfootDev/flatbuffers-bigfoot
1
0
Fork 0
forked from BigfootDev/flatbuffers
Code Pull Requests Activity

Java: Added access object for vector of struct and vector of tables. (#5233)

Browse Source 
* Java: Added access object for vector of struct and vector of tables.

* Java: Workarounds removed when accessing the union vector.
This commit is contained in:
Kulikov Alexey
2019-09-23 23:22:43 +07:00
committed by Wouter van Oortmerssen
parent 97f3aa9174
commit e365c502ff
40 changed files with 989 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files

42
java/com/google/flatbuffers/Table.java
View File

@@ -75,6 +75,13 @@ public class Table {
return offset + bb.getInt(offset);
}
/**
* Retrieve a relative offset.
*
* @param offset An `int` index into a ByteBuffer containing the relative offset.
* @param bb from which the relative offset will be retrieved.
* @return Returns the relative offset stored at `offset`.
*/
protected static int __indirect(int offset, ByteBuffer bb) {
return offset + bb.getInt(offset);
}
@@ -91,6 +98,23 @@ public class Table {
* @return Returns a `String` from the data stored inside the FlatBuffer at `offset`.
*/
protected String __string(int offset) {
return __string(offset, bb, utf8);
}
/**
* Create a Java `String` from UTF-8 data stored inside the FlatBuffer.
*
* This allocates a new string and converts to wide chars upon each access,
* which is not very efficient. Instead, each FlatBuffer string also comes with an
* accessor based on __vector_as_bytebuffer below, which is much more efficient,
* assuming your Java program can handle UTF-8 data directly.
*
* @param offset An `int` index into the Table's ByteBuffer.
* @param bb Table ByteBuffer used to read a string at given offset.
* @param utf8 decoder that creates a Java `String` from UTF-8 characters.
* @return Returns a `String` from the data stored inside the FlatBuffer at `offset`.
*/
protected static String __string(int offset, ByteBuffer bb, Utf8 utf8) {
offset += bb.getInt(offset);
int length = bb.getInt(offset);
return utf8.decodeUtf8(bb, offset + SIZEOF_INT, length);
@@ -169,11 +193,19 @@ public class Table {
* @return Returns the Table that points to the union at `offset`.
*/
protected Table __union(Table t, int offset) {
offset += bb_pos;
t.bb_pos = offset + bb.getInt(offset);
t.bb = bb;
t.vtable_start = t.bb_pos - bb.getInt(t.bb_pos);
t.vtable_size = bb.getShort(t.vtable_start);
return __union(t, offset, bb);
}
/**
* Initialize any Table-derived type to point to the union at the given `offset`.
*
* @param t A `Table`-derived type that should point to the union at `offset`.
* @param offset An `int` index into the Table's ByteBuffer.
* @param bb Table ByteBuffer used to initialize the object Table-derived type.
* @return Returns the Table that points to the union at `offset`.
*/
protected static Table __union(Table t, int offset, ByteBuffer bb) {
t.__reset(__indirect(offset, bb), bb);
return t;
}