/**
* (c) Copyright 2012 WibiData, Inc.
*
* See the NOTICE file distributed with this work for additional
* information regarding copyright ownership.
*
* 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 org.kiji.schema;
import java.io.IOException;
import com.google.common.base.Preconditions;
import org.kiji.annotations.ApiAudience;
import org.kiji.annotations.ApiStability;
import org.kiji.schema.impl.BoundColumnReaderSpec;
import org.kiji.schema.impl.CounterCellDecoder;
import org.kiji.schema.impl.GenericCellDecoder;
import org.kiji.schema.impl.ProtobufCellDecoder;
import org.kiji.schema.impl.RawBytesCellDecoder;
import org.kiji.schema.layout.CellSpec;
import org.kiji.schema.layout.KijiTableLayout;
/**
* Factory for Kiji cell decoders using GenericCellDecoder to handle record-based schemas.
*/
@ApiAudience.Framework
@ApiStability.Evolving
public final class GenericCellDecoderFactory implements KijiCellDecoderFactory {
/** Singleton instance. */
private static final GenericCellDecoderFactory SINGLETON = new GenericCellDecoderFactory();
/** @return an instance of the GenericCellDecoderFactory. */
public static KijiCellDecoderFactory get() {
return SINGLETON;
}
/** Singleton constructor. */
private GenericCellDecoderFactory() {
}
/** {@inheritDoc} */
@Override
public <T> KijiCellDecoder<T> create(CellSpec cellSpec) throws IOException {
Preconditions.checkNotNull(cellSpec);
switch (cellSpec.getCellSchema().getType()) {
case AVRO:
case CLASS:
case INLINE:
return new GenericCellDecoder<T>(cellSpec);
case RAW_BYTES:
return new RawBytesCellDecoder(cellSpec);
case PROTOBUF:
return new ProtobufCellDecoder<T>(cellSpec);
case COUNTER:
// purposefully forget the type (long) param of cell decoders for counters.
@SuppressWarnings("unchecked")
final KijiCellDecoder<T> counterCellDecoder = (KijiCellDecoder<T>) CounterCellDecoder.get();
return counterCellDecoder;
default:
throw new InternalKijiError("Unhandled cell encoding: " + cellSpec.getCellSchema());
}
}
/** {@inheritDoc} */
@Override
public <T> KijiCellDecoder<T> create(KijiTableLayout layout, BoundColumnReaderSpec spec)
throws IOException {
Preconditions.checkNotNull(layout);
Preconditions.checkNotNull(spec);
switch (spec.getColumnReaderSpec().getEncoding()) {
case RAW_BYTES:
return new RawBytesCellDecoder<T>(spec);
case AVRO:
return new GenericCellDecoder<T>(layout, spec);
case PROTOBUF:
return new ProtobufCellDecoder<T>(layout, spec);
case COUNTER:
// purposefully forget the type (long) param of cell decoders for counters.
@SuppressWarnings("unchecked")
final KijiCellDecoder<T> counterCellDecoder = (KijiCellDecoder<T>) CounterCellDecoder.get();
return counterCellDecoder;
default:
throw new InternalKijiError(
"Unhandled cell encoding in reader spec: " + spec.getColumnReaderSpec());
}
}
}