org.junit.platform.launcher.core.ServiceLoaderTestEngineRegistry Maven / Gradle / Ivy
/*
* Copyright 2015-2019 the original author or authors.
*
* All rights reserved. This program and the accompanying materials are
* made available under the terms of the Eclipse Public License v2.0 which
* accompanies this distribution and is available at
*
* https://www.eclipse.org/legal/epl-v20.html
*/
package org.junit.platform.launcher.core;
import static java.lang.String.join;
import static java.util.stream.Collectors.toList;
import java.util.ArrayList;
import java.util.List;
import java.util.ServiceLoader;
import java.util.stream.Stream;
import org.junit.platform.commons.logging.Logger;
import org.junit.platform.commons.logging.LoggerFactory;
import org.junit.platform.commons.util.ClassLoaderUtils;
import org.junit.platform.commons.util.CollectionUtils;
import org.junit.platform.engine.TestEngine;
/**
* @since 1.0
*/
class ServiceLoaderTestEngineRegistry {
private static final Logger logger = LoggerFactory.getLogger(ServiceLoaderTestEngineRegistry.class);
public Iterable loadTestEngines() {
Iterable testEngines = ServiceLoader.load(TestEngine.class,
ClassLoaderUtils.getDefaultClassLoader());
logger.config(() -> createDiscoveredTestEnginesMessage(testEngines));
return testEngines;
}
@SuppressWarnings("unchecked")
private String createDiscoveredTestEnginesMessage(Iterable testEngines) {
// @formatter:off
List details = ((Stream) CollectionUtils.toStream(testEngines))
.map(engine -> String.format("%s (%s)", engine.getId(), join(", ", computeAttributes(engine))))
.collect(toList());
return details.isEmpty()
? "No TestEngine implementation discovered."
: "Discovered TestEngines with IDs: [" + join(", ", details) + "]";
// @formatter:on
}
private List computeAttributes(TestEngine engine) {
List attributes = new ArrayList<>(4);
engine.getGroupId().ifPresent(groupId -> attributes.add("group ID: " + groupId));
engine.getArtifactId().ifPresent(artifactId -> attributes.add("artifact ID: " + artifactId));
engine.getVersion().ifPresent(version -> attributes.add("version: " + version));
ClassLoaderUtils.getLocation(engine).ifPresent(location -> attributes.add("location: " + location));
return attributes;
}
}