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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.searchlib.rankingexpression.rule;
import com.yahoo.searchlib.rankingexpression.evaluation.Context;
import com.yahoo.searchlib.rankingexpression.evaluation.Value;
import java.util.Collections;
import java.util.Deque;
import java.util.List;
/**
* A node which flips the sign of the value produced from the nested expression
*
* @author bratseth
*/
public class NegativeNode extends CompositeNode {
private final ExpressionNode value;
/** Constructs a new negative node */
public NegativeNode(ExpressionNode value) {
this.value = value;
}
/** Returns the node creating the value negated by this */
public ExpressionNode getValue() { return value; }
@Override
public List<ExpressionNode> children() {
return Collections.singletonList(value);
}
@Override
public String toString(SerializationContext context, Deque<String> path, CompositeNode parent) {
return "-" + value.toString(context, path, parent);
}
@Override
public Value evaluate(Context context) {
return value.evaluate(context).negate();
}
@Override
public NegativeNode setChildren(List<ExpressionNode> children) {
if (children.size() != 1) throw new IllegalArgumentException("Expected 1 children but got " + children.size());
return new NegativeNode(children.get(0));
}
}
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