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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.demo;
import com.yahoo.component.chain.dependencies.After;
import com.yahoo.component.chain.dependencies.Before;
import com.yahoo.component.chain.dependencies.Provides;
import com.yahoo.demo.DemoConfig.Demo;
import com.yahoo.prelude.query.AndItem;
import com.yahoo.prelude.query.CompositeItem;
import com.yahoo.prelude.query.Item;
import com.yahoo.prelude.query.WordItem;
import com.yahoo.processing.request.CompoundName;
import com.yahoo.search.Query;
import com.yahoo.search.Result;
import com.yahoo.search.Searcher;
import com.yahoo.search.query.QueryTree;
import com.yahoo.search.searchchain.Execution;
import com.yahoo.search.searchchain.PhaseNames;
import java.util.List;
/**
* A searcher for adding a set of configured terms as AND terms, and add a
* single term from the request to the query tree (after running the term
* through a shared component).
*/
@After(PhaseNames.RAW_QUERY)
@Before(PhaseNames.TRANSFORMED_QUERY)
@Provides(DemoSearcher.DEMO_TRANSFORM)
public class DemoSearcher extends Searcher {
public static final String DEMO_TRANSFORM = "com.yahoo.demo.DemoSearcher.NothingUseful";
/**
* The request property with this name will be filtered and added to the
* query as an AND term.
*/
public static final CompoundName EXTRA_TERM = new CompoundName("extraTerm");
private final List<Demo> extraTerms;
private final DemoComponent infrastructure;
public DemoSearcher(DemoComponent infrastructure, DemoConfig extraTerms) {
this.extraTerms = extraTerms.demo();
this.infrastructure = infrastructure;
}
/**
* Programmatic query transform, add terms from config and the EXTRA_TERM
* request property.
*/
@Override
public Result search(Query query, Execution execution) {
QueryTree q = query.getModel().getQueryTree();
addAndItem(q, infrastructure.normalize(
query.properties().getString(EXTRA_TERM)));
for (Demo d : extraTerms) {
addAndItem(q, d.term());
}
return execution.search(query);
}
private void addAndItem(QueryTree q, String term) {
Item root = q.getRoot();
CompositeItem compositeRoot;
if (root instanceof AndItem) {
compositeRoot = (CompositeItem) root;
} else {
compositeRoot = new AndItem();
compositeRoot.addItem(root);
q.setRoot(compositeRoot);
}
compositeRoot.addItem(new WordItem(term));
}
}
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