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/*
* Copyright (c) 2016 Cisco and/or its affiliates.
*
* 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 io.fd.honeycomb.infra.distro.schema;
import com.google.common.base.Charsets;
import com.google.common.base.Strings;
import com.google.common.collect.Lists;
import com.google.common.io.Resources;
import com.google.inject.AbstractModule;
import com.google.inject.Singleton;
import com.google.inject.multibindings.Multibinder;
import java.io.IOException;
import java.net.URL;
import java.util.Collections;
import java.util.List;
import javax.annotation.Nonnull;
import org.opendaylight.yangtools.yang.binding.YangModelBindingProvider;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Load all YangModelBindingProvider classes from classpath.
* <p/>
* Relying on /META-INF/services/ metadata.
*/
public class YangBindingProviderModule extends AbstractModule {
private static final Logger LOG = LoggerFactory.getLogger(YangBindingProviderModule.class);
private static final String YANG_BA_PROVIDER_PATH = "META-INF/services/" + YangModelBindingProvider.class.getName();
protected void configure() {
final Multibinder<YangModelBindingProvider> binder =
Multibinder.newSetBinder(binder(), YangModelBindingProvider.class);
final List<URL> resources;
try {
resources = Collections.list(getClass().getClassLoader().getResources(YANG_BA_PROVIDER_PATH));
} catch (IOException e) {
throw new IllegalStateException("Unable to load binding providers from path: " + YANG_BA_PROVIDER_PATH, e);
}
LOG.debug("ModuleProviders found at {}", resources);
resources.stream()
.map(YangBindingProviderModule::urlToString)
.flatMap(content -> Lists.newArrayList(content.split("\n")).stream())
.filter(line -> !Strings.isNullOrEmpty(line.trim()))
.distinct()
.map(YangBindingProviderModule::loadClass)
.forEach(providerClass -> {
LOG.debug("ModuleProvider found for {}", providerClass);
binder.addBinding().to((Class<? extends YangModelBindingProvider>) providerClass)
.in(Singleton.class);
});
}
private static Class<?> loadClass(@Nonnull final String className) {
try {
return Class.forName(className);
} catch (ClassNotFoundException e) {
throw new IllegalArgumentException("Unable to load class: " + className, e);
}
}
private static String urlToString(@Nonnull final URL url) {
try {
return Resources.toString(url, Charsets.UTF_8);
} catch (IOException e) {
throw new IllegalArgumentException("Unable to read resource from: " + url, e);
}
}
}
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