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package com.yahoo.prelude.fastsearch;
import com.yahoo.data.access.Inspector;
import com.yahoo.data.access.simple.Value;
import com.yahoo.io.GrowableByteBuffer;
import com.yahoo.tensor.Tensor;
import com.yahoo.tensor.serialization.TypedBinaryFormat;
import java.nio.ByteBuffer;
import java.util.Optional;
/**
* A tensor field. Tensors are encoded as a data field where the data (following the length)
* is encoded in a tensor binary format defined by com.yahoo.tensor.serialization.TypedBinaryFormat
*
* @author bratseth
*/
public class TensorField extends DocsumField implements VariableLengthField {
public TensorField(String name) {
super(name);
}
@Override
public Tensor decode(ByteBuffer buffer) {
int length = buffer.getInt();
if (length == 0) return null;
ByteBuffer contentBuffer = ByteBuffer.wrap(buffer.array(), buffer.arrayOffset() + buffer.position(), length);
Tensor tensor = TypedBinaryFormat.decode(Optional.empty(), new GrowableByteBuffer(contentBuffer));
buffer.position(buffer.position() + length);
return tensor;
}
@Override
public Tensor decode(ByteBuffer b, FastHit hit) {
Tensor tensor = decode(b);
hit.setField(name, tensor);
return tensor;
}
@Override
public String toString() {
return "field " + getName() + " type tensor";
}
@Override
public int getLength(ByteBuffer b) {
int offset = b.position();
int length = b.getInt();
b.position(offset + length);
return length;
}
@Override
public int sizeOfLength() {
return 4;
}
@Override
public Object convert(Inspector value) {
byte[] content = value.asData(Value.empty().asData());
if (content.length == 0) return null;
return TypedBinaryFormat.decode(Optional.empty(), GrowableByteBuffer.wrap(content));
}
}
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