/*
* 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.cast;
import com.google.common.base.Preconditions;
import io.crate.metadata.DynamicFunctionResolver;
import io.crate.metadata.FunctionIdent;
import io.crate.metadata.FunctionImplementation;
import io.crate.metadata.FunctionInfo;
import io.crate.operation.scalar.ScalarFunctionModule;
import io.crate.planner.symbol.Function;
import io.crate.types.ArrayType;
import io.crate.types.DataType;
import io.crate.types.DataTypes;
import org.apache.lucene.util.BytesRef;
import java.util.List;
import java.util.Locale;
public class ToStringArrayFunction extends ToArrayFunction<BytesRef> {
public static final String NAME = "toStringArray";
public static final DataType ARRAY_STRING_TYPE = new ArrayType(DataTypes.STRING);
private static FunctionInfo createInfo(List<DataType> types) {
return new FunctionInfo(new FunctionIdent(NAME, types), ARRAY_STRING_TYPE);
}
public static void register(ScalarFunctionModule module) {
module.register(NAME, new Resolver());
}
private ToStringArrayFunction(FunctionInfo info) {
super(info);
}
private static class Resolver implements DynamicFunctionResolver {
@Override
public FunctionImplementation<Function> getForTypes(List<DataType> dataTypes) throws IllegalArgumentException {
Preconditions.checkArgument(dataTypes.size() == 1, "Invalid number of arguments");
Preconditions.checkArgument(DataTypes.isCollectionType(dataTypes.get(0)), "Argument must be a collection type");
ArrayType arrayType = (ArrayType) dataTypes.get(0);
// TODO: support geo inner types
Preconditions.checkArgument(DataTypes.PRIMITIVE_TYPES.contains(arrayType.innerType()),
String.format(Locale.ENGLISH, "Array inner type '%s' not supported for conversion",
arrayType.innerType().getName()));
return new ToStringArrayFunction(createInfo(dataTypes));
}
}
}