/* * Copyright 2017 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 java.time.LocalDateTime; import java.time.format.DateTimeFormatter; import java.time.format.DateTimeParseException; import java.util.Locale; 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 {@link LocalDateTime} to/from Cloud Datastore. * {@link LocalDateTime} types are mapped to String type in the Cloud Datastore. * {@link LocalDateTime} objects are persisted into the datastore with a nano-second precision in * the <code>uuuu-MM-dd'T'HH:mm:ss.nnnnnnnnn</code> format. * * @author Sai Pullabhotla * */ public class LocalDateTimeMapper implements Mapper { /** * The formatter to use for converting LocalTime to String and vice versa. */ public static final DateTimeFormatter FORMATTER = DateTimeFormatter .ofPattern("uuuu-MM-dd'T'HH:mm:ss.nnnnnnnnn", Locale.ENGLISH); @Override public ValueBuilder<?, ?, ?> toDatastore(Object input) { if (input == null) { return NullValue.newBuilder(); } return StringValue.newBuilder(((LocalDateTime) input).format(FORMATTER)); } @Override public Object toModel(Value<?> input) { if (input instanceof NullValue) { return null; } try { return LocalDateTime.parse(((StringValue) input).get(), FORMATTER); } catch (ClassCastException exp) { String pattern = "Mapping of type %s to %s is not supported"; throw new MappingException( String.format(pattern, input.getClass().getName(), LocalDateTime.class.getName()), exp); } catch (DateTimeParseException exp) { throw new MappingException(exp); } } }