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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.document.datatypes;
import com.yahoo.document.Field;
import com.yahoo.document.TensorDataType;
import com.yahoo.document.serialization.FieldReader;
import com.yahoo.document.serialization.FieldWriter;
import com.yahoo.document.serialization.XmlStream;
import com.yahoo.tensor.Tensor;
import com.yahoo.tensor.TensorType;
import java.util.Optional;
/**
* Field value class that wraps a tensor.
*
* @author geirst
*/
public class TensorFieldValue extends FieldValue {
private Optional<Tensor> tensor;
private final TensorDataType dataType;
/** Create an empty tensor field value */
public TensorFieldValue(TensorType type) {
this.dataType = new TensorDataType(type);
this.tensor = Optional.empty();
}
/** Create a tensor field value containing the given tensor */
public TensorFieldValue(Tensor tensor) {
this.dataType = new TensorDataType(tensor.type());
this.tensor = Optional.of(tensor);
}
public Optional<Tensor> getTensor() {
return tensor;
}
@Override
public TensorDataType getDataType() {
return dataType;
}
@Override
public void printXml(XmlStream xml) {
// TODO (geirst)
}
@Override
public void clear() {
tensor = Optional.empty();
}
@Override
public void assign(Object o) {
if (o == null) {
assignTensor(Optional.empty());
} else if (o instanceof Tensor) {
assignTensor(Optional.of((Tensor)o));
} else if (o instanceof TensorFieldValue) {
assignTensor(((TensorFieldValue)o).getTensor());
} else {
throw new IllegalArgumentException("Expected class '" + getClass().getName() + "', got '" +
o.getClass().getName() + "'.");
}
}
public void assignTensor(Optional<Tensor> tensor) {
if (tensor.isPresent() && ! tensor.get().type().isAssignableTo(dataType.getTensorType()))
throw new IllegalArgumentException("Type mismatch: Cannot assign tensor of type " + tensor.get().type() +
" to field of type " + dataType.getTensorType());
this.tensor = tensor;
}
@Override
public void serialize(Field field, FieldWriter writer) {
writer.write(field, this);
}
@Override
public void deserialize(Field field, FieldReader reader) {
reader.read(field, this);
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if ( ! (o instanceof TensorFieldValue)) return false;
TensorFieldValue other = (TensorFieldValue)o;
if ( ! dataType.getTensorType().equals(other.dataType.getTensorType())) return false;
if ( ! tensor.equals(other.tensor)) return false;
return true;
}
@Override
public Object getWrappedValue() {
return tensor.orElse(null);
}
}
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