/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.cayenne.unit.util;
import org.apache.cayenne.di.spi.ModuleProvider;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import java.util.ServiceLoader;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
public class ModuleProviderChecker {
private Class<? extends ModuleProvider> expectedProvider;
private Class<? extends ModuleProvider> providerInterface;
public static void testProviderPresent(Class<? extends ModuleProvider> expectedProvider,
Class<? extends ModuleProvider> providerInterface) {
new ModuleProviderChecker(expectedProvider, providerInterface).testProviderPresent();
}
protected ModuleProviderChecker(Class<? extends ModuleProvider> expectedProvider,
Class<? extends ModuleProvider> providerInterface) {
this.expectedProvider = Objects.requireNonNull(expectedProvider);
this.providerInterface = Objects.requireNonNull(providerInterface);
assertTrue("Provider interface expected", providerInterface.isInterface());
if(expectedProvider.equals(providerInterface)) {
fail("Expected provider class and required interface should be different.");
}
}
protected void testProviderPresent() {
List<ModuleProvider> providers = new ArrayList<>();
for (ModuleProvider p : ServiceLoader.load(providerInterface)) {
if (expectedProvider.equals(p.getClass())) {
providers.add(p);
}
}
switch (providers.size()) {
case 0:
fail("Expected provider '" + expectedProvider.getName() + "' is not found");
break;
case 1:
break;
default:
fail("Expected provider '" + expectedProvider.getName() + "' is found more then once: " + providers.size());
break;
}
}
}