/* * 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.custommappers; import java.lang.reflect.Field; import java.math.BigDecimal; import com.google.cloud.datastore.LongValue; import com.google.cloud.datastore.NullValue; import com.google.cloud.datastore.Value; import com.google.cloud.datastore.ValueBuilder; import com.jmethods.catatumbo.Mapper; import com.jmethods.catatumbo.MappingException;; /** * A custom mapper for testing the custom mapper functionality. This mapper maps a BigDecimal type * to an Integer property in the Cloud Datastore. * * @author Sai Pullabhotla * */ public class CurrencyMapper implements Mapper { /** * Fractional digits */ private int fractionalDigits; /** * Creates a new instance of CurrencyMapper. * * @param field * the field to which this mapper is to be attached. */ public CurrencyMapper(Field field) { if (!field.getType().equals(BigDecimal.class)) { throw new IllegalArgumentException("Field type must be BigDecimal"); } this.fractionalDigits = 2; } @Override public ValueBuilder<?, ?, ?> toDatastore(Object input) { if (input == null) { return NullValue.newBuilder(); } try { BigDecimal n = (BigDecimal) input; n = n.movePointRight(fractionalDigits); return LongValue.newBuilder(n.longValueExact()); } catch (Exception e) { throw new MappingException(e); } } @Override public Object toModel(Value<?> input) { if (input instanceof NullValue) { return null; } BigDecimal n = new BigDecimal(((LongValue) input).get()); n = n.movePointLeft(fractionalDigits); return n; } }