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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.translate.util.write;
import static com.google.common.base.Preconditions.checkArgument;
import io.fd.honeycomb.translate.util.RWUtils;
import io.fd.honeycomb.translate.write.DataValidationFailedException;
import io.fd.honeycomb.translate.write.Validator;
import io.fd.honeycomb.translate.write.WriteContext;
import io.fd.honeycomb.translate.write.WriteFailedException;
import io.fd.honeycomb.translate.write.Writer;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import org.opendaylight.yangtools.yang.binding.DataObject;
import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public abstract class AbstractGenericWriter<D extends DataObject> implements Writer<D> {
private static final Logger LOG = LoggerFactory.getLogger(AbstractGenericWriter.class);
private final InstanceIdentifier<D> instanceIdentifier;
private final boolean supportsUpdate;
private Validator<D> validator;
protected AbstractGenericWriter(final InstanceIdentifier<D> type, final boolean supportsUpdate) {
this.instanceIdentifier = RWUtils.makeIidWildcarded(type);
this.supportsUpdate = supportsUpdate;
}
protected AbstractGenericWriter(final InstanceIdentifier<D> type, final boolean supportsUpdate,
final Validator<D> validator) {
this(type, supportsUpdate);
this.validator = validator;
}
@Override
public void processModification(@Nonnull final InstanceIdentifier<? extends DataObject> id,
@Nullable final DataObject dataBefore,
@Nullable final DataObject dataAfter,
@Nonnull final WriteContext ctx) throws WriteFailedException {
LOG.debug("{}: Updating : {}", this, id);
LOG.trace("{}: Updating : {}, from: {} to: {}", this, id, dataBefore, dataAfter);
checkArgument(idPointsToCurrent(id), "Cannot handle data: %s. Only: %s can be handled by writer: %s",
id, getManagedDataObjectType(), this);
if (isWrite(dataBefore, dataAfter)) {
LOG.debug("{}: Writing {} data: {}", this, id, dataAfter);
final D after = castToManaged(dataAfter);
writeCurrentAttributes(getSpecificId(id, after), after, ctx);
} else if (isDelete(dataBefore, dataAfter)) {
LOG.debug("{}: Deleting {} data: {}", this, id, dataBefore);
final D before = castToManaged(dataBefore);
deleteCurrentAttributes(getSpecificId(id, before), before, ctx);
} else {
LOG.debug("{}: Updating {} dataBefore: {}, datAfter: {}", this, id, dataBefore, dataAfter);
checkArgument(dataBefore != null && dataAfter != null, "No data to process");
if (dataBefore.equals(dataAfter)) {
LOG.debug("{}: Skipping modification (no update): {}", this, id);
// No change, ignore
return;
}
final D before = castToManaged(dataBefore);
updateCurrentAttributes(getSpecificId(id, before), before, castToManaged(dataAfter), ctx);
}
}
@Override
public void validate(@Nonnull final InstanceIdentifier<? extends DataObject> id,
@Nullable final DataObject dataBefore, @Nullable final DataObject dataAfter,
@Nonnull final WriteContext ctx) throws DataValidationFailedException {
if (validator == null) {
LOG.trace("{}: validator is not defined. Skipping validation for {}", this, id);
return;
}
LOG.trace("{}: Validating : {}, before: {} after: {}", this, id, dataBefore, dataAfter);
checkArgument(idPointsToCurrent(id), "Cannot handle data: %s. Only: %s can be handled by writer: %s",
id, getManagedDataObjectType(), this);
if (isWrite(dataBefore, dataAfter)) {
final D after = castToManaged(dataAfter);
validator.validateWrite(getSpecificId(id, after), after, ctx);
} else if (isDelete(dataBefore, dataAfter)) {
final D before = castToManaged(dataBefore);
validator.validateDelete(getSpecificId(id, before), before, ctx);
} else {
checkArgument(dataBefore != null && dataAfter != null, "No data to process");
if (dataBefore.equals(dataAfter)) {
LOG.debug("{}: Skipping validation (no update) for: {}", this, id);
// No change, ignore
return;
}
final D before = castToManaged(dataBefore);
validator.validateUpdate(getSpecificId(id, before), before, castToManaged(dataAfter), ctx);
}
}
@SuppressWarnings("unchecked")
protected InstanceIdentifier<D> getSpecificId(@Nonnull final InstanceIdentifier<? extends DataObject> currentId,
@Nonnull final D current) {
return (InstanceIdentifier<D>) currentId;
}
private void checkDataType(@Nonnull final DataObject dataAfter) {
checkArgument(getManagedDataObjectType().getTargetType().isAssignableFrom(dataAfter.getClass()));
}
private D castToManaged(final DataObject data) {
checkDataType(data);
return getManagedDataObjectType().getTargetType().cast(data);
}
private static boolean isWrite(final DataObject dataBefore,
final DataObject dataAfter) {
return dataBefore == null && dataAfter != null;
}
private static boolean isDelete(final DataObject dataBefore,
final DataObject dataAfter) {
return dataAfter == null && dataBefore != null;
}
private boolean idPointsToCurrent(final @Nonnull InstanceIdentifier<? extends DataObject> id) {
return id.getTargetType().equals(getManagedDataObjectType().getTargetType());
}
protected abstract void writeCurrentAttributes(@Nonnull final InstanceIdentifier<D> id,
@Nonnull final D data,
@Nonnull final WriteContext ctx) throws WriteFailedException;
protected abstract void deleteCurrentAttributes(@Nonnull final InstanceIdentifier<D> id,
@Nonnull final D dataBefore,
@Nonnull final WriteContext ctx) throws WriteFailedException;
protected abstract void updateCurrentAttributes(@Nonnull final InstanceIdentifier<D> id,
@Nonnull final D dataBefore,
@Nonnull final D dataAfter,
@Nonnull final WriteContext ctx) throws WriteFailedException;
@Nonnull
@Override
public InstanceIdentifier<D> getManagedDataObjectType() {
return instanceIdentifier;
}
@Override
public String toString() {
return String.format("Writer[%s]", getManagedDataObjectType().getTargetType().getSimpleName());
}
@Override
public boolean supportsDirectUpdate() {
return supportsUpdate;
}
}
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