public ArrayWritable readArray(ArrayWritable aw) throws IOException {
if (aw == null) {
aw = new ArrayWritable(TypedBytesWritable.class);
} else if (!aw.getValueClass().equals(TypedBytesWritable.class)) {
throw new RuntimeException("value class has to be TypedBytesWritable");
}
int length = in.readVectorHeader();
Writable[] writables = new Writable[length];
for (int i = 0; i < length; i++) {
writables[i] = new TypedBytesWritable(in.readRaw());
}
aw.set(writables);
return aw;
}
public Text readText(Text t) throws IOException {
if (t == null) {
t = new Text();
}
t.set(in.readString());
return t;
}
public FloatWritable readFloat(FloatWritable fw) throws IOException {
if (fw == null) {
fw = new FloatWritable();
}
fw.set(in.readFloat());
return fw;
}
public DoubleWritable readDouble(DoubleWritable dw) throws IOException {
if (dw == null) {
dw = new DoubleWritable();
}
dw.set(in.readDouble());
return dw;
}
public VIntWritable readVInt(VIntWritable iw) throws IOException {
if (iw == null) {
iw = new VIntWritable();
}
iw.set(in.readInt());
return iw;
}
public VLongWritable readVLong(VLongWritable lw) throws IOException {
if (lw == null) {
lw = new VLongWritable();
}
lw.set(in.readLong());
return lw;
}
public BooleanWritable readBoolean(BooleanWritable bw) throws IOException {
if (bw == null) {
bw = new BooleanWritable();
}
bw.set(in.readBool());
return bw;
}
public ShortWritable readShort(ShortWritable sw) throws IOException {
if (sw == null) {
sw = new ShortWritable();
}
sw.set(in.readShort());
return sw;
}
public ByteWritable readByte(ByteWritable bw) throws IOException {
if (bw == null) {
bw = new ByteWritable();
}
bw.set(in.readByte());
return bw;
}
public BytesWritable readBytes(BytesWritable bw) throws IOException {
byte[] bytes = in.readBytes();
if (bw == null) {
bw = new BytesWritable(bytes);
} else {
bw.set(bytes, 0, bytes.length);
}
return bw;
}
public SortedMapWritable readSortedMap(SortedMapWritable mw) throws IOException {
if (mw == null) {
mw = new SortedMapWritable();
}
int length = in.readMapHeader();
for (int i = 0; i < length; i++) {
WritableComparable key = (WritableComparable) read();
Writable value = read();
mw.put(key, value);
}
return mw;
}
public Writable readWritable(Writable writable) throws IOException {
ByteArrayInputStream bais = new ByteArrayInputStream(in.readBytes());
DataInputStream dis = new DataInputStream(bais);
String className = WritableUtils.readString(dis);
if (writable == null) {
try {
Class<? extends Writable> cls = conf.getClassByName(className).asSubclass(Writable.class);
writable = (Writable) ReflectionUtils.newInstance(cls, conf);
} catch (ClassNotFoundException e) {
throw new IOException(e);
}
} else if (!writable.getClass().getName().equals(className)) {
throw new IOException("wrong Writable class given");
}
writable.readFields(dis);
return writable;
}
public Class<? extends Writable> readType() throws IOException {
Type type = in.readType();
if (type == null) {
return null;
}
switch (type) {
case BYTES:
return BytesWritable.class;
case BYTE:
return ByteWritable.class;
case BOOL:
return BooleanWritable.class;
case INT:
return VIntWritable.class;
case LONG:
return VLongWritable.class;
case FLOAT:
return FloatWritable.class;
case SHORT:
return ShortWritable.class;
case DOUBLE:
return DoubleWritable.class;
case STRING:
return Text.class;
case VECTOR:
return ArrayWritable.class;
case MAP:
return MapWritable.class;
case WRITABLE:
return Writable.class;
case ENDOFRECORD:
return null;
case NULL:
return NullWritable.class;
default:
throw new RuntimeException("unknown type");
}
}
public Writable read() throws IOException {
Type type = in.readType();
if (type == null) {
return null;
}
switch (type) {
case BYTES:
return readBytes();
case BYTE:
return readByte();
case BOOL:
return readBoolean();
case INT:
return readVInt();
case SHORT:
return readShort();
case LONG:
return readVLong();
case FLOAT:
return readFloat();
case DOUBLE:
return readDouble();
case STRING:
return readText();
case VECTOR:
return readArray();
case MAP:
return readMap();
case WRITABLE:
return readWritable();
case ENDOFRECORD:
return null;
case NULL:
return NullWritable.get();
default:
throw new RuntimeException("unknown type");
}
}
/**
* Get a thread-local typed bytes writable input for the supplied {@link DataInput}.
*
* @param in data input object
* @return typed bytes writable input corresponding to the supplied {@link DataInput}.
*/
public static TypedBytesWritableInput get(DataInput in) {
return get(TypedBytesInput.get(in));
}
public Type readTypeCode() throws IOException {
return in.readType();
}