}
assert (isNull == 1);
switch (type.getCategory()) {
case PRIMITIVE: {
PrimitiveTypeInfo ptype = (PrimitiveTypeInfo) type;
switch (ptype.getPrimitiveCategory()) {
case VOID: {
return null;
}
case BOOLEAN: {
BooleanWritable r = reuse == null ? new BooleanWritable()
: (BooleanWritable) reuse;
byte b = buffer.read(invert);
assert (b == 1 || b == 2);
r.set(b == 2);
return r;
}
case BYTE: {
ByteWritable r = reuse == null ? new ByteWritable()
: (ByteWritable) reuse;
r.set((byte) (buffer.read(invert) ^ 0x80));
return r;
}
case SHORT: {
ShortWritable r = reuse == null ? new ShortWritable()
: (ShortWritable) reuse;
int v = buffer.read(invert) ^ 0x80;
v = (v << 8) + (buffer.read(invert) & 0xff);
r.set((short) v);
return r;
}
case INT: {
IntWritable r = reuse == null ? new IntWritable() : (IntWritable) reuse;
int v = buffer.read(invert) ^ 0x80;
for (int i = 0; i < 3; i++) {
v = (v << 8) + (buffer.read(invert) & 0xff);
}
r.set(v);
return r;
}
case LONG: {
LongWritable r = reuse == null ? new LongWritable()
: (LongWritable) reuse;
long v = buffer.read(invert) ^ 0x80;
for (int i = 0; i < 7; i++) {
v = (v << 8) + (buffer.read(invert) & 0xff);
}
r.set(v);
return r;
}
case FLOAT: {
FloatWritable r = reuse == null ? new FloatWritable()
: (FloatWritable) reuse;
int v = 0;
for (int i = 0; i < 4; i++) {
v = (v << 8) + (buffer.read(invert) & 0xff);
}
if ((v & (1 << 31)) == 0) {
// negative number, flip all bits
v = ~v;
} else {
// positive number, flip the first bit
v = v ^ (1 << 31);
}
r.set(Float.intBitsToFloat(v));
return r;
}
case DOUBLE: {
DoubleWritable r = reuse == null ? new DoubleWritable()
: (DoubleWritable) reuse;
long v = 0;
for (int i = 0; i < 8; i++) {
v = (v << 8) + (buffer.read(invert) & 0xff);
}
if ((v & (1L << 63)) == 0) {
// negative number, flip all bits
v = ~v;
} else {
// positive number, flip the first bit
v = v ^ (1L << 63);
}
r.set(Double.longBitsToDouble(v));
return r;
}
case STRING: {
Text r = reuse == null ? new Text() : (Text) reuse;
// Get the actual length first
int start = buffer.tell();
int length = 0;
do {
byte b = buffer.read(invert);
if (b == 0) {
// end of string
break;
}
if (b == 1) {
// the last char is an escape char. read the actual char
buffer.read(invert);
}
length++;
} while (true);
if (length == buffer.tell() - start) {
// No escaping happened, so we are already done.
r.set(buffer.getData(), start, length);
} else {
// Escaping happened, we need to copy byte-by-byte.
// 1. Set the length first.
r.set(buffer.getData(), start, length);
// 2. Reset the pointer.
buffer.seek(start);
// 3. Copy the data.
byte[] rdata = r.getBytes();
for (int i = 0; i < length; i++) {
byte b = buffer.read(invert);
if (b == 1) {
// The last char is an escape char, read the actual char.
// The serialization format escape \0 to \1, and \1 to \2,
// to make sure the string is null-terminated.
b = (byte) (buffer.read(invert) - 1);
}
rdata[i] = b;
}
// 4. Read the null terminator.
byte b = buffer.read(invert);
assert (b == 0);
}
return r;
}
case BINARY: {
BytesWritable bw = new BytesWritable() ;
// Get the actual length first
int start = buffer.tell();
int length = 0;
do {
byte b = buffer.read(invert);
if (b == 0) {
// end of string
break;
}
if (b == 1) {
// the last char is an escape char. read the actual char
buffer.read(invert);
}
length++;
} while (true);
if (length == buffer.tell() - start) {
// No escaping happened, so we are already done.
bw.set(buffer.getData(), start, length);
} else {
// Escaping happened, we need to copy byte-by-byte.
// 1. Set the length first.
bw.set(buffer.getData(), start, length);
// 2. Reset the pointer.
buffer.seek(start);
// 3. Copy the data.
byte[] rdata = bw.getBytes();
for (int i = 0; i < length; i++) {
byte b = buffer.read(invert);
if (b == 1) {
// The last char is an escape char, read the actual char.
// The serialization format escape \0 to \1, and \1 to \2,
// to make sure the string is null-terminated.
b = (byte) (buffer.read(invert) - 1);
}
rdata[i] = b;
}
// 4. Read the null terminator.
byte b = buffer.read(invert);
assert (b == 0);
}
return bw;
}
case TIMESTAMP:
TimestampWritable t = (reuse == null ? new TimestampWritable() :
(TimestampWritable) reuse);
byte[] bytes = new byte[8];
for (int i = 0; i < bytes.length; i++) {
bytes[i] = buffer.read(invert);
}
t.setBinarySortable(bytes, 0);
return t;
default: {
throw new RuntimeException("Unrecognized type: "
+ ptype.getPrimitiveCategory());
}
}
}
case LIST: {
ListTypeInfo ltype = (ListTypeInfo) type;