org.springframework.hateoas.VndErrorsMarshallingTest.java Source code

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Here is the source code for org.springframework.hateoas.VndErrorsMarshallingTest.java

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/*
 * Copyright 2013-2014 the original author or authors.
 *
 * 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 org.springframework.hateoas;

import static org.hamcrest.Matchers.*;
import static org.junit.Assert.*;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.StringReader;
import java.io.StringWriter;
import java.io.Writer;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.charset.Charset;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;

import org.custommonkey.xmlunit.Diff;
import org.junit.Before;
import org.junit.Test;
import org.springframework.core.io.ClassPathResource;
import org.springframework.hateoas.VndErrors.VndError;
import org.springframework.hateoas.core.EvoInflectorRelProvider;
import org.springframework.hateoas.hal.Jackson2HalModule;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;

/**
 * Integration tests for marshalling of {@link VndErrors}.
 * 
 * @author Oliver Gierke
 */
public class VndErrorsMarshallingTest {

    ObjectMapper jackson2Mapper;
    Marshaller marshaller;
    Unmarshaller unmarshaller;

    RelProvider relProvider = new EvoInflectorRelProvider();

    VndErrors errors;
    String jsonReference;
    String json2Reference;
    String xmlReference;

    public VndErrorsMarshallingTest() throws IOException {

        jsonReference = readFile(new ClassPathResource("vnderror.json"));
        json2Reference = readFile(new ClassPathResource("vnderror2.json"));
        xmlReference = readFile(new ClassPathResource("vnderror.xml"));
    }

    @Before
    public void setUp() throws Exception {

        jackson2Mapper = new com.fasterxml.jackson.databind.ObjectMapper();
        jackson2Mapper.registerModule(new Jackson2HalModule());
        jackson2Mapper.setHandlerInstantiator(new Jackson2HalModule.HalHandlerInstantiator(relProvider, null));
        jackson2Mapper.configure(SerializationFeature.INDENT_OUTPUT, true);

        JAXBContext context = JAXBContext.newInstance(VndErrors.class);
        marshaller = context.createMarshaller();
        unmarshaller = context.createUnmarshaller();

        VndError error = new VndError("42", "Validation failed!", //
                new Link("http://...", "describes"), new Link("http://...", "help"));
        errors = new VndErrors(error, error, error);
    }

    /**
     * @see #62
     */
    @Test
    public void jackson2Marshalling() throws Exception {
        assertThat(jackson2Mapper.writeValueAsString(errors), equalToIgnoringWhiteSpace(json2Reference));
    }

    /**
     * @see #62, #154
     */
    @Test
    public void jaxbMarshalling() throws Exception {

        Writer writer = new StringWriter();
        marshaller.marshal(errors, writer);

        assertThat(new Diff(xmlReference, writer.toString()).similar(), is(true));
    }

    /**
     * @see #93, #94
     */
    @Test
    public void jackson2UnMarshalling() throws Exception {
        assertThat(jackson2Mapper.readValue(jsonReference, VndErrors.class), is(errors));
    }

    /**
     * @see #93, #94
     */
    @Test
    public void jaxbUnMarshalling() throws Exception {
        VndErrors actual = (VndErrors) unmarshaller.unmarshal(new StringReader(xmlReference));
        assertThat(actual, is(errors));
    }

    private static String readFile(org.springframework.core.io.Resource resource) throws IOException {

        FileInputStream stream = new FileInputStream(resource.getFile());

        try {
            FileChannel fc = stream.getChannel();
            MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());
            return Charset.defaultCharset().decode(bb).toString();
        } finally {
            stream.close();
        }
    }
}