103 lines
3.7 KiB
Java
103 lines
3.7 KiB
Java
/*
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* The MIT License
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* Copyright © 2014-2021 Ilkka Seppälä
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package com.iluwatar.tolerantreader;
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import java.io.FileInputStream;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.ObjectInputStream;
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import java.io.ObjectOutputStream;
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import java.util.Map;
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/**
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* RainbowFishSerializer provides methods for reading and writing {@link RainbowFish} objects to
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* file. Tolerant Reader pattern is implemented here by serializing maps instead of {@link
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* RainbowFish} objects. This way the reader does not break even though new properties are added to
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* the schema.
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*/
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public final class RainbowFishSerializer {
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public static final String LENGTH_METERS = "lengthMeters";
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public static final String WEIGHT_TONS = "weightTons";
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private RainbowFishSerializer() {
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}
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/**
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* Write V1 RainbowFish to file.
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*/
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public static void writeV1(RainbowFish rainbowFish, String filename) throws IOException {
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var map = Map.of(
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"name", rainbowFish.getName(),
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"age", String.format("%d", rainbowFish.getAge()),
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LENGTH_METERS, String.format("%d", rainbowFish.getLengthMeters()),
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WEIGHT_TONS, String.format("%d", rainbowFish.getWeightTons())
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);
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try (var fileOut = new FileOutputStream(filename);
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var objOut = new ObjectOutputStream(fileOut)) {
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objOut.writeObject(map);
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}
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}
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/**
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* Write V2 RainbowFish to file.
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*/
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public static void writeV2(RainbowFishV2 rainbowFish, String filename) throws IOException {
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var map = Map.of(
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"name", rainbowFish.getName(),
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"age", String.format("%d", rainbowFish.getAge()),
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"lengthMeters", String.format("%d", rainbowFish.getLengthMeters()),
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WEIGHT_TONS, String.format("%d", rainbowFish.getWeightTons()),
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"angry", Boolean.toString(rainbowFish.getAngry()),
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"hungry", Boolean.toString(rainbowFish.getHungry()),
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"sleeping", Boolean.toString(rainbowFish.getSleeping())
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);
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try (var fileOut = new FileOutputStream(filename);
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var objOut = new ObjectOutputStream(fileOut)) {
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objOut.writeObject(map);
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}
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}
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/**
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* Read V1 RainbowFish from file.
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*/
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public static RainbowFish readV1(String filename) throws IOException, ClassNotFoundException {
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Map<String, String> map;
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try (var fileIn = new FileInputStream(filename);
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var objIn = new ObjectInputStream(fileIn)) {
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map = (Map<String, String>) objIn.readObject();
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}
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return new RainbowFish(
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map.get("name"),
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Integer.parseInt(map.get("age")),
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Integer.parseInt(map.get("lengthMeters")),
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Integer.parseInt(map.get(WEIGHT_TONS))
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);
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}
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}
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