org.springframework.data.web.config.SpringDataWebConfigurationIntegrationTests.java Source code

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Here is the source code for org.springframework.data.web.config.SpringDataWebConfigurationIntegrationTests.java

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/*
 * Copyright 2015-2017 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.data.web.config;

import static org.assertj.core.api.Assertions.*;

import java.util.ArrayList;
import java.util.List;

import org.assertj.core.api.Condition;
import org.junit.Test;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.data.classloadersupport.HidingClassLoader;
import org.springframework.data.web.ProjectingJackson2HttpMessageConverter;
import org.springframework.data.web.XmlBeamHttpMessageConverter;
import org.springframework.http.converter.HttpMessageConverter;
import org.xmlbeam.ProjectionFactory;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.jayway.jsonpath.DocumentContext;

/**
 * Integration test for {@link SpringDataWebConfiguration}.
 *
 * @author Christoph Strobl
 * @author Jens Schauder
 * @author Oliver Gierke
 */
public class SpringDataWebConfigurationIntegrationTests {

    @Test // DATACMNS-987
    public void shouldNotLoadJacksonConverterWhenJacksonNotPresent() {

        List<HttpMessageConverter<?>> converters = new ArrayList<HttpMessageConverter<?>>();

        createConfigWithClassLoader(HidingClassLoader.hide(ObjectMapper.class)).extendMessageConverters(converters);

        assertThat(converters).areNot(instanceWithClassName(ProjectingJackson2HttpMessageConverter.class));
    }

    @Test // DATACMNS-987
    public void shouldNotLoadJacksonConverterWhenJaywayNotPresent() {

        List<HttpMessageConverter<?>> converters = new ArrayList<HttpMessageConverter<?>>();

        createConfigWithClassLoader(HidingClassLoader.hide(DocumentContext.class))
                .extendMessageConverters(converters);

        assertThat(converters).areNot(instanceWithClassName(ProjectingJackson2HttpMessageConverter.class));
    }

    @Test // DATACMNS-987
    public void shouldNotLoadXBeamConverterWhenXBeamNotPresent() throws Exception {

        List<HttpMessageConverter<?>> converters = new ArrayList<HttpMessageConverter<?>>();

        ClassLoader classLoader = HidingClassLoader.hide(ProjectionFactory.class);
        createConfigWithClassLoader(classLoader).extendMessageConverters(converters);

        assertThat(converters).areNot(instanceWithClassName(XmlBeamHttpMessageConverter.class));
    }

    @Test // DATACMNS-987
    public void shouldLoadAllConvertersWhenDependenciesArePresent() throws Exception {

        List<HttpMessageConverter<?>> converters = new ArrayList<HttpMessageConverter<?>>();

        createConfigWithClassLoader(getClass().getClassLoader()).extendMessageConverters(converters);

        assertThat(converters).haveAtLeastOne(instanceWithClassName(XmlBeamHttpMessageConverter.class));
        assertThat(converters).haveAtLeastOne(instanceWithClassName(ProjectingJackson2HttpMessageConverter.class));
    }

    private SpringDataWebConfiguration createConfigWithClassLoader(ClassLoader classLoader) {

        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(
                SpringDataWebConfiguration.class);

        context.setClassLoader(classLoader);

        try {
            return context.getBean(SpringDataWebConfiguration.class);
        } finally {
            context.close();
        }
    }

    /**
     * Creates a {@link Condition} that checks if an object is an instance of a class with the same name as the provided
     * class. This is necessary since we are dealing with multiple classloaders which would make a simple instanceof fail
     * all the time
     *
     * @param expectedClass the class that is expected (possibly loaded by a different classloader).
     * @return a {@link Condition}
     */
    private static Condition<Object> instanceWithClassName(Class<?> expectedClass) {

        return new Condition<>(it -> it.getClass().getName().equals(expectedClass.getName()), //
                "with class name %s!", expectedClass.getName());
    }
}