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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.search.predicate.serialization;
import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonGenerator;
import com.yahoo.search.predicate.PredicateQuery;
import com.yahoo.search.predicate.PredicateQueryParser;
import com.yahoo.search.predicate.SubqueryBitmap;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.StringWriter;
import java.io.Writer;
import java.util.List;
/**
* Converts {@link PredicateQuery} to and from JSON
*
* Example:
* {
* features: [
* {"k": "key-name", "v":"value", "s":"0xDEADBEEFDEADBEEF"}
* ],
* rangeFeatures: [
* {"k": "key-name", "v":42, "s":"0xDEADBEEFDEADBEEF"}
* ]
* }
*
* @author bjorncs
*/
public class PredicateQuerySerializer {
private final JsonFactory factory = new JsonFactory();
private final PredicateQueryParser parser = new PredicateQueryParser();
public String toJSON(PredicateQuery query) {
try {
StringWriter writer = new StringWriter(1024);
toJSON(query, writer);
return writer.toString();
} catch (IOException e) {
throw new RuntimeException(e);
}
}
public void toJSON(PredicateQuery query, Writer writer) throws IOException {
try (JsonGenerator g = factory.createGenerator(writer)) {
g.writeStartObject();
// Write features
g.writeArrayFieldStart("features");
for (PredicateQuery.Feature feature : query.getFeatures()) {
writeFeature(feature.key, feature.value, feature.subqueryBitmap, g, JsonGenerator::writeStringField);
}
g.writeEndArray();
// Write rangeFeatures
g.writeArrayFieldStart("rangeFeatures");
for (PredicateQuery.RangeFeature rangeFeature : query.getRangeFeatures()) {
writeFeature(rangeFeature.key, rangeFeature.value, rangeFeature.subqueryBitmap, g,
JsonGenerator::writeNumberField);
}
g.writeEndArray();
g.writeEndObject();
}
}
private static <T> void writeFeature(
String key, T value, long subqueryBitmap, JsonGenerator g, ValueWriter<T> valueWriter)
throws IOException {
g.writeStartObject();
g.writeStringField("k", key);
valueWriter.write(g, "v", value);
if (subqueryBitmap != SubqueryBitmap.DEFAULT_VALUE) {
g.writeStringField("s", toHexString(subqueryBitmap));
}
g.writeEndObject();
}
@FunctionalInterface
private interface ValueWriter<T> {
void write(JsonGenerator g, String key, T value) throws IOException;
}
public PredicateQuery fromJSON(String json) {
PredicateQuery query = new PredicateQuery();
parser.parseJsonQuery(json, query::addFeature, query::addRangeFeature);
return query;
}
public static List<PredicateQuery> parseQueriesFromFile(String queryFile, int maxQueryCount) throws IOException {
PredicateQuerySerializer serializer = new PredicateQuerySerializer();
try (BufferedReader reader = new BufferedReader(new FileReader(queryFile), 8 * 1024)) {
return reader.lines()
.limit(maxQueryCount)
.map(serializer::fromJSON)
.toList();
}
}
private static String toHexString(long subqueryBitMap) {
return "0x" + Long.toHexString(subqueryBitMap);
}
}
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