MoneyXstreamLegacyTest.java

/**
 * Copyright (C) cedarsoft GmbH.
 *
 * Licensed under the GNU General Public License version 3 (the "License")
 * with Classpath Exception; you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 *         http://www.cedarsoft.org/gpl3ce
 *         (GPL 3 with Classpath Exception)
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 3 only, as
 * published by the Free Software Foundation. cedarsoft GmbH designates this
 * particular file as subject to the "Classpath" exception as provided
 * by cedarsoft GmbH in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 3 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 3 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact cedarsoft GmbH, 72810 Gomaringen, Germany,
 * or visit www.cedarsoft.com if you need additional information or
 * have any questions.
 */

package com.cedarsoft.serialization.demo2;


import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.converters.ConversionException;
import org.junit.*;
import org.xml.sax.SAXException;

import javax.annotation.Nonnull;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import java.io.IOException;
import java.io.InputStream;

import static com.cedarsoft.test.utils.AssertUtils.assertXMLEquals;
import static org.junit.Assert.*;

/**
 *
 */
public class MoneyXstreamLegacyTest {
  private XStream xStream;

  @Before
  public void setUp() throws Exception {
    xStream = new XStream();
    xStream.alias( "money", Money.class );
  }

  @Test
  public void testFromXml() throws IOException {
    assertEquals( 701, ( ( Money ) xStream.fromXML( MoneyTest.EXPECTED.openStream() ) ).getCents() );
    assertEquals( 7.01, ( ( Money ) xStream.fromXML( MoneyTest.EXPECTED.openStream() ) ).getAmount(), 0 );
  }

  @Test
  public void testFromXmlLegacyFormat() throws IOException {
    try {
      xStream.fromXML( com.cedarsoft.serialization.demo1.MoneyTest.EXPECTED.openStream() );
      fail( "Where is the Exception" );
    } catch ( ConversionException e ) {
      assertEquals( "No such field com.cedarsoft.serialization.demo2.Money.amount\n" +
                      "---- Debugging information ----\n" +
                      "field               : amount\n" +
                      "class               : com.cedarsoft.serialization.demo2.Money\n" +
                      "required-type       : com.cedarsoft.serialization.demo2.Money\n" +
                      "converter-type      : com.thoughtworks.xstream.converters.reflection.ReflectionConverter\n" +
                      "path                : /money/amount\n" +
                      "line number         : 3\n" +
                      "version             : 1.4.7\n" +
                      "-------------------------------", e.getMessage() );
    }
  }

  @Test
  public void testCustomConverter() throws IOException, SAXException {
    xStream.registerConverter( new MoneyConverter() );
    //writing
    assertXMLEquals( com.cedarsoft.serialization.demo2.MoneyTest.EXPECTED, xStream.toXML( new Money( 701 ) ) );
    //current format
    assertEquals( 701, ( ( Money ) xStream.fromXML( MoneyTest.EXPECTED.openStream() ) ).getCents() );
    //old format
    assertEquals( 701, ( ( Money ) xStream.fromXML( com.cedarsoft.serialization.demo1.MoneyTest.EXPECTED.openStream() ) ).getCents() );
  }

  @Test
  public void testManual() throws XMLStreamException, IOException, SAXException {
    assertEquals( 701, deserialize( MoneyTest.EXPECTED.openStream(), Version.CURRENT ).getCents() );
    assertEquals( 701, deserialize( com.cedarsoft.serialization.demo1.MoneyTest.EXPECTED.openStream(), Version.LEGACY ).getCents() );
  }

  private static Money deserialize( @Nonnull InputStream serialized, Version version ) throws XMLStreamException {
    //Boilerplate
    XMLInputFactory factory = XMLInputFactory.newInstance();
    XMLStreamReader reader = factory.createXMLStreamReader( serialized );
    //    writer.writeStartDocument();

    //That is the actual code
    reader.nextTag();//money
    reader.nextTag();//cents or amount
    reader.next();//the content

    long cents;
    if ( version == Version.LEGACY ) {
      cents = Money.convertValueToCents( Double.parseDouble( reader.getText() ) );
    } else {
      cents = Long.parseLong( reader.getText() );
    }

    return new Money( cents );
  }

  public enum Version {
    LEGACY,
    CURRENT
  }
}