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/*
* Copyright (c) 2017 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.hc2vpp.docs.core;
import static java.util.stream.Collectors.toMap;
import com.google.common.io.Resources;
import java.io.IOException;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
import org.opendaylight.yangtools.yang.binding.YangModelBindingProvider;
import org.opendaylight.yangtools.yang.binding.YangModuleInfo;
/**
* Maps namespaces to models
*/
class ModelTypeIndex {
private final Map<YangModelKey, String> namespaceToModuleIndex;
ModelTypeIndex() throws IOException {
namespaceToModuleIndex = collectAllModules(this.getClass().getClassLoader())
.stream()
.collect(toMap(YangModelKey::new, yangModuleInfo -> yangModuleInfo.getName().toString()));
}
private static YangModelBindingProvider getModuleBindingProviderInstance(final Class<?> aClass) {
try {
return (YangModelBindingProvider) aClass.newInstance();
} catch (InstantiationException | IllegalAccessException e) {
throw new IllegalStateException(e);
}
}
private static Class<?> loadClass(final ClassLoader classLoader, final String name) {
try {
return classLoader.loadClass(name);
} catch (ClassNotFoundException e) {
throw new IllegalStateException(e);
}
}
private static List<String> loadResource(final URL url) {
try {
return Resources.readLines(url, StandardCharsets.UTF_8);
} catch (IOException e) {
throw new IllegalStateException(e);
}
}
String namespaceToModule(final String namespace,
final String revision) {
return namespaceToModuleIndex.get(new YangModelKey(namespace, revision));
}
private Set<YangModuleInfo> collectAllModules(final ClassLoader classLoader) throws IOException {
return Collections.list(classLoader.getResources("META-INF/services/" +
YangModelBindingProvider.class.getName()))
.stream()
.map(ModelTypeIndex::loadResource)
.flatMap(Collection::stream)
.map(name -> loadClass(classLoader, name))
.map(ModelTypeIndex::getModuleBindingProviderInstance)
.map(YangModelBindingProvider::getModuleInfo)
.collect(Collectors.toSet());
}
}
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