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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.example;
import com.yahoo.data.access.Inspectable;
import com.yahoo.data.access.Inspector;
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.result.Hit;
import com.yahoo.search.searchchain.Execution;
import com.yahoo.search.searchchain.SearchChain;
import com.yahoo.tensor.Tensor;
import com.yahoo.tensor.TensorType;
import java.util.Iterator;
import java.util.Map;
public class UserProfileSearcher extends Searcher {
public Result search(Query query, Execution execution) {
Object userIdProperty = query.properties().get("user_id");
if (userIdProperty != null) {
Hit userProfile = retrieveUserProfile(userIdProperty.toString(), execution);
if (userProfile != null) {
addUserProfileTensorToQuery(query, userProfile);
addReadItemsToQuery(query, userProfile);
}
}
return execution.search(query);
}
private Hit retrieveUserProfile(String userId, Execution execution) {
Query query = new Query();
query.getModel().setRestrict("user");
query.getModel().getQueryTree().setRoot(new WordItem(userId, "user_id"));
query.setHits(1);
SearchChain vespaChain = execution.searchChainRegistry().getComponent("vespa");
Result result = new Execution(vespaChain, execution.context()).search(query);
execution.fill(result); // this is needed to get the actual summary data
Iterator<Hit> hiterator = result.hits().deepIterator();
return hiterator.hasNext() ? hiterator.next() : null;
}
private void addReadItemsToQuery(Query query, Hit userProfile) {
Object readItems = userProfile.getField("has_read_items");
if (readItems != null && readItems instanceof Inspectable) {
query.properties().set(new CompoundName("has_read_items"), readItems);
}
}
private void addUserProfileTensorToQuery(Query query, Hit userProfile) {
Object userItemCf = userProfile.getField("user_item_cf");
if (userItemCf != null && userItemCf instanceof Inspectable) {
Tensor.Builder tensorBuilder = Tensor.Builder.of(new TensorType.Builder().indexed("user_item_cf", 10).build());
Inspector cells = ((Inspectable)userItemCf).inspect().field("cells");
for (Inspector cell : cells.entries()) {
Tensor.Builder.CellBuilder cellBuilder = tensorBuilder.cell();
Inspector address = cell.field("address");
for (Map.Entry<String, Inspector> entry : address.fields()) {
String dim = entry.getKey();
String label = entry.getValue().asString();
cellBuilder.label(dim, label);
}
Inspector value = cell.field("value");
cellBuilder.value(value.asDouble());
}
query.properties().set(new CompoundName("user_item_cf"), tensorBuilder.build());
}
}
}
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