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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.search.pagetemplates.engine.resolvers;
import com.yahoo.search.Query;
import com.yahoo.search.Result;
import com.yahoo.search.pagetemplates.engine.Resolution;
import com.yahoo.search.pagetemplates.engine.Resolver;
import com.yahoo.search.pagetemplates.model.Choice;
import com.yahoo.search.pagetemplates.model.MapChoice;
import com.yahoo.search.pagetemplates.model.PageElement;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* A resolver which
* <ul>
* <li>Always chooses the <i>last</i> alternative of any Choice
* <li>Always maps values to placeholders in the order they are listed in the map definition of any MapChoice
* </ul>
* This is useful for testing.
* <p>
* The id of this if <code>native.deterministic</code>
*
* @author <a href="mailto:bratseth@yahoo-inc.com">Jon Bratseth</a>
*/
public class DeterministicResolver extends Resolver {
public static final String nativeId = "native.deterministic";
public DeterministicResolver() {}
protected DeterministicResolver(String id) {
super(id);
}
/** Chooses the last alternative of any choice */
@Override
public void resolve(Choice choice, Query query, Result result, Resolution resolution) {
resolution.addChoiceResolution(choice,choice.alternatives().size()-1);
}
/** Chooses a mapping which is always by the literal order given in the source template */
@Override
public void resolve(MapChoice choice,Query query,Result result,Resolution resolution) {
Map<String, List<PageElement>> mapping=new HashMap<>();
// Map 1-1 by order
List<String> placeholderIds=choice.placeholderIds();
List<List<PageElement>> valueList=choice.values();
int i=0;
for (String placeholderId : placeholderIds)
mapping.put(placeholderId,valueList.get(i++));
resolution.addMapChoiceResolution(choice,mapping);
}
}
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