/*
* Copyright 2016 Sai Pullabhotla.
*
* Licensed 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.
*/
package com.jmethods.catatumbo.mappers;
import com.google.cloud.datastore.NullValue;
import com.google.cloud.datastore.StringValue;
import com.google.cloud.datastore.Value;
import com.google.cloud.datastore.ValueBuilder;
import com.jmethods.catatumbo.Mapper;
import com.jmethods.catatumbo.MappingException;
/**
* An implementation of {@link Mapper} for mapping Char type to/from Cloud Datastore.
*
* @author Sai Pullabhotla
*
*/
public class CharMapper implements Mapper {
@Override
public ValueBuilder<?, ?, ?> toDatastore(Object input) {
if (input == null) {
return NullValue.newBuilder();
}
return StringValue.newBuilder(String.valueOf((char) input));
}
@Override
public Object toModel(Value<?> input) {
if (input instanceof NullValue) {
return null;
}
String str = ((StringValue) input).get();
if (str.length() != 1) {
throw new MappingException(String.format("Unable to convert %s to char", str));
}
return str.charAt(0);
}
}
