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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.rule.CompositeNode;
import com.yahoo.searchlib.rankingexpression.rule.ExpressionNode;
import com.yahoo.searchlib.rankingexpression.rule.ReferenceNode;
import com.yahoo.searchlib.rankingexpression.transform.ExpressionTransformer;
import java.util.Map;
/**
* Inlines macros in ranking expressions
*
* @author bratseth
*/
class MacroInliner extends ExpressionTransformer {
private final Map<String, RankProfile.Macro> macros;
public MacroInliner(Map<String, RankProfile.Macro> macros) {
this.macros = macros;
}
@Override
public ExpressionNode transform(ExpressionNode node) {
if (node instanceof ReferenceNode)
return transformFeatureNode((ReferenceNode)node);
if (node instanceof CompositeNode)
return transformChildren((CompositeNode)node);
return node;
}
private ExpressionNode transformFeatureNode(ReferenceNode feature) {
RankProfile.Macro macro = macros.get(feature.getName());
if (macro == null) return feature;
return transform(macro.getRankingExpression().getRoot()); // inline recursively and return
}
}
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