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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.v3po.translate.util.write;
import com.google.common.base.Optional;
import com.google.common.base.Preconditions;
import com.google.common.collect.Iterables;
import io.fd.honeycomb.v3po.translate.util.ReflectionUtils;
import io.fd.honeycomb.v3po.translate.spi.write.ChildWriterCustomizer;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Collections;
import javax.annotation.Nonnull;
import org.opendaylight.yangtools.yang.binding.DataObject;
import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
/**
* Might be slow !
*/
public class ReflexiveChildWriterCustomizer<C extends DataObject> extends NoopWriterCustomizer<C> implements
ChildWriterCustomizer<C> {
@Nonnull
@Override
@SuppressWarnings("unchecked")
public Optional<C> extract(@Nonnull final InstanceIdentifier<C> currentId, @Nonnull final DataObject parentData) {
final Class<C> currentType = currentId.getTargetType();
final Optional<Method> method = ReflectionUtils.findMethodReflex(getParentType(currentId),
"get" + currentType.getSimpleName(), Collections.<Class<?>>emptyList(), currentType);
Preconditions.checkArgument(method.isPresent(), "Unable to get %s from %s", currentType, parentData);
try {
return method.isPresent()
? Optional.of((C) method.get().invoke(parentData))
: Optional.<C>absent();
} catch (IllegalAccessException | InvocationTargetException e) {
throw new IllegalArgumentException("Unable to get " + currentType + " from " + parentData, e);
}
}
private Class<? extends DataObject> getParentType(final @Nonnull InstanceIdentifier<C> currentId) {
return Iterables.get(currentId.getPathArguments(), Iterables.size(currentId.getPathArguments()) - 2).getType();
}
}
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