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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;
/**
* This class represents another expression enclosed in braces.
*
* @author <a href="mailto:simon@yahoo-inc.com">Simon Thoresen</a>
*/
public final class EmbracedNode extends CompositeNode {
// The node to embrace.
private final ExpressionNode value;
/**
* Creates a new expression node that embraces another.
*
* @param value The node to embrace.
*/
public EmbracedNode(ExpressionNode value) {
this.value=value;
}
/** Returns the node enclosed 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) {
String expression = value.toString(context, path, this);
if (value instanceof ReferenceNode) return expression;
return "(" + expression + ")";
}
@Override
public Value evaluate(Context context) {
return value.evaluate(context);
}
@Override
public CompositeNode setChildren(List<ExpressionNode> newChildren) {
if (newChildren.size() != 1)
throw new IllegalArgumentException("Expected 1 child but got " + newChildren.size());
return new EmbracedNode(newChildren.get(0));
}
}
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