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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.searchdefinition;
import com.yahoo.searchlib.rankingexpression.evaluation.TensorValue;
import com.yahoo.searchlib.rankingexpression.evaluation.Value;
import com.yahoo.searchlib.rankingexpression.rule.CompositeNode;
import com.yahoo.searchlib.rankingexpression.rule.ExpressionNode;
import com.yahoo.searchlib.rankingexpression.rule.NameNode;
import com.yahoo.searchlib.rankingexpression.rule.ReferenceNode;
import com.yahoo.searchlib.rankingexpression.transform.ExpressionTransformer;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
/**
* Transforms named references to constant tensors with the rank feature 'constant'.
*
* @author geirst
*/
class ConstantTensorTransformer extends ExpressionTransformer {
private final Map<String, Value> constants;
private final Map<String, String> rankPropertiesOutput;
public ConstantTensorTransformer(Map<String, Value> constants,
Map<String, String> rankPropertiesOutput) {
this.constants = constants;
this.rankPropertiesOutput = rankPropertiesOutput;
}
@Override
public ExpressionNode transform(ExpressionNode node) {
if (node instanceof ReferenceNode) {
return transformFeature((ReferenceNode) node);
} else if (node instanceof CompositeNode) {
return transformChildren((CompositeNode) node);
} else {
return node;
}
}
private ExpressionNode transformFeature(ReferenceNode node) {
if (!node.getArguments().isEmpty()) {
return transformArguments(node);
} else {
return transformConstantReference(node);
}
}
private ExpressionNode transformArguments(ReferenceNode node) {
List<ExpressionNode> arguments = node.getArguments().expressions();
List<ExpressionNode> transformedArguments = new ArrayList<>(arguments.size());
for (ExpressionNode argument : arguments) {
transformedArguments.add(transform(argument));
}
return node.setArguments(transformedArguments);
}
private ExpressionNode transformConstantReference(ReferenceNode node) {
Value value = constants.get(node.getName());
if (value == null || !(value instanceof TensorValue)) {
return node;
}
TensorValue tensorValue = (TensorValue)value;
String featureName = "constant(" + node.getName() + ")";
String tensorType = tensorValue.asTensor().type().toString();
rankPropertiesOutput.put(featureName + ".value", tensorValue.toString());
rankPropertiesOutput.put(featureName + ".type", tensorType);
return new ReferenceNode("constant", Arrays.asList(new NameNode(node.getName())), null);
}
}
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