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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.tensor;
import com.google.common.annotations.Beta;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
/**
* Builder class for a MapTensor.
*
* The set of dimensions of the resulting tensor is the union of
* the dimensions specified explicitly and the ones specified in the
* tensor cell addresses.
*
* @author <a href="mailto:geirst@yahoo-inc.com">Geir Storli</a>
*/
@Beta
public class MapTensorBuilder {
private final Set<String> dimensions = new HashSet<>();
private final Map<TensorAddress, Double> cells = new HashMap<>();
public class CellBuilder {
private final TensorAddress.Builder addressBuilder = new TensorAddress.Builder();
public CellBuilder label(String dimension, String label) {
dimensions.add(dimension);
addressBuilder.add(dimension, label);
return this;
}
public MapTensorBuilder value(double cellValue) {
cells.put(addressBuilder.build(), cellValue);
return MapTensorBuilder.this;
}
}
public MapTensorBuilder() {
}
public MapTensorBuilder dimension(String dimension) {
dimensions.add(dimension);
return this;
}
public CellBuilder cell() {
return new CellBuilder();
}
public Tensor build() {
return new MapTensor(dimensions, cells);
}
}
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