/*
* Licensed to CRATE Technology GmbH ("Crate") under one or more contributor
* license agreements. See the NOTICE file distributed with this work for
* additional information regarding copyright ownership. Crate licenses
* this file to you under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License. You may
* obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
* However, if you have executed another commercial license agreement
* with Crate these terms will supersede the license and you may use the
* software solely pursuant to the terms of the relevant commercial agreement.
*/
package io.crate.operation.scalar.geo;
import com.google.common.collect.ImmutableList;
import io.crate.metadata.FunctionIdent;
import io.crate.metadata.FunctionInfo;
import io.crate.operation.scalar.ScalarFunctionModule;
import io.crate.operation.scalar.UnaryScalar;
import io.crate.types.DataType;
import io.crate.types.DataTypes;
import io.crate.types.GeoPointType;
import org.apache.lucene.util.BytesRef;
import org.elasticsearch.common.geo.GeoHashUtils;
import org.elasticsearch.common.lucene.BytesRefs;
import java.util.Collections;
import java.util.List;
import java.util.function.Function;
public final class GeoHashFunction {
private static final List<DataType> SUPPORTED_INPUT_TYPES = ImmutableList.of(DataTypes.GEO_POINT, DataTypes.STRING, DataTypes.DOUBLE_ARRAY, DataTypes.UNDEFINED);
private static void register(ScalarFunctionModule module, String name, Function<Object, BytesRef> func) {
for (DataType inputType : SUPPORTED_INPUT_TYPES) {
FunctionIdent ident = new FunctionIdent(name, Collections.singletonList(inputType));
module.register(new UnaryScalar<>(new FunctionInfo(ident, DataTypes.STRING), func));
}
}
public static void register(ScalarFunctionModule module) {
register(module, "geohash", GeoHashFunction::getGeoHash);
}
private static BytesRef getGeoHash(Object value) {
Double[] geoValue = GeoPointType.INSTANCE.value(value);
return BytesRefs.toBytesRef(GeoHashUtils.stringEncode(geoValue[0], geoValue[1]));
}
}