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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.tensor.evaluation;
import com.google.common.annotations.Beta;
import com.yahoo.tensor.Tensor;
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;
/**
* A tensor variable name which resolves to a tensor in the context at evaluation time
*
* @author bratseth
*/
@Beta
public class VariableTensor extends PrimitiveTensorFunction {
private final String name;
public VariableTensor(String name) {
this.name = name;
}
@Override
public List<TensorFunction> functionArguments() { return Collections.emptyList(); }
@Override
public TensorFunction replaceArguments(List<TensorFunction> arguments) { return this; }
@Override
public PrimitiveTensorFunction toPrimitive() { return this; }
@Override
public Tensor evaluate(EvaluationContext context) {
return ((MapEvaluationContext)context).get(name);
}
@Override
public String toString(ToStringContext context) {
return name;
}
}
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