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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.searchlib.rankingexpression.rule;
import com.yahoo.searchlib.rankingexpression.Reference;
import com.yahoo.searchlib.rankingexpression.evaluation.Context;
import com.yahoo.searchlib.rankingexpression.evaluation.Value;
import com.yahoo.tensor.TensorType;
import com.yahoo.tensor.evaluation.TypeContext;
import java.util.Deque;
import java.util.List;
import java.util.Objects;
/**
* A node which returns the outcome of a comparison.
*
* @author bratseth
*/
public class ComparisonNode extends BooleanNode {
/** The operator string of this condition. */
private final TruthOperator operator;
private final List<ExpressionNode> conditions;
public ComparisonNode(ExpressionNode leftCondition, TruthOperator operator, ExpressionNode rightCondition) {
conditions = List.of(leftCondition, rightCondition);
this.operator = operator;
}
@Override
public List<ExpressionNode> children() {
return conditions;
}
public TruthOperator getOperator() { return operator; }
public ExpressionNode getLeftCondition() { return conditions.get(0); }
public ExpressionNode getRightCondition() { return conditions.get(1); }
@Override
public StringBuilder toString(StringBuilder string, SerializationContext context, Deque<String> path, CompositeNode parent) {
getLeftCondition().toString(string, context, path, this).append(' ').append(operator).append(' ');
return getRightCondition().toString(string, context, path, this);
}
@Override
public TensorType type(TypeContext<Reference> context) {
return TensorType.empty; // by definition
}
@Override
public Value evaluate(Context context) {
Value leftValue = getLeftCondition().evaluate(context);
Value rightValue = getRightCondition().evaluate(context);
return leftValue.compare(operator,rightValue);
}
@Override
public ComparisonNode setChildren(List<ExpressionNode> children) {
if (children.size() != 2) throw new IllegalArgumentException("A comparison test must have 2 children");
return new ComparisonNode(children.get(0), operator, children.get(1));
}
@Override
public int hashCode() { return Objects.hash(operator, conditions); }
}
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