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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.tensor.evaluation;
import com.yahoo.tensor.Tensor;
import com.yahoo.tensor.TensorType;
import com.yahoo.tensor.functions.PrimitiveTensorFunction;
import com.yahoo.tensor.functions.TensorFunction;
import com.yahoo.tensor.functions.ToStringContext;
import java.util.Collections;
import java.util.List;
import java.util.Objects;
import java.util.Optional;
/**
* A tensor variable name which resolves to a tensor in the context at evaluation time
*
* @author bratseth
*/
public class VariableTensor<NAMETYPE extends Name> extends PrimitiveTensorFunction<NAMETYPE> {
private final String name;
private final Optional<TensorType> requiredType;
public VariableTensor(String name) {
this.name = name;
this.requiredType = Optional.empty();
}
/** A variable tensor which must be compatible with the given type */
public VariableTensor(String name, TensorType requiredType) {
this.name = name;
this.requiredType = Optional.of(requiredType);
}
@Override
public List<TensorFunction<NAMETYPE>> arguments() { return Collections.emptyList(); }
@Override
public TensorFunction<NAMETYPE> withArguments(List<TensorFunction<NAMETYPE>> arguments) { return this; }
@Override
public PrimitiveTensorFunction<NAMETYPE> toPrimitive() { return this; }
@Override
public TensorType type(TypeContext<NAMETYPE> context) {
TensorType givenType = context.getType(name);
if (givenType == null) return null;
verifyType(givenType);
return givenType;
}
@Override
public Tensor evaluate(EvaluationContext<NAMETYPE> context) {
Tensor tensor = context.getTensor(name);
if (tensor == null) return null;
verifyType(tensor.type());
return tensor;
}
@Override
public String toString(ToStringContext<NAMETYPE> context) {
return name;
}
@Override
public int hashCode() { return Objects.hash("variableTensor", name, requiredType); }
private void verifyType(TensorType givenType) {
if (requiredType.isPresent() && ! givenType.isAssignableTo(requiredType.get()))
throw new IllegalArgumentException("Variable '" + name + "' must be compatible with " +
requiredType.get() + " but was " + givenType);
}
}
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