wgtmac commented on code in PR #1230: URL: https://github.com/apache/parquet-mr/pull/1230#discussion_r1421438240
########## parquet-common/src/main/java/org/apache/parquet/compression/FallbackCodecFactory.java: ########## @@ -0,0 +1,74 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you 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.apache.parquet.compression; + +import org.apache.parquet.Preconditions; +import org.apache.parquet.hadoop.metadata.CompressionCodecName; + +/** + * {@link CompressionCodecFactory} implementation that delegates to the {@link CompressionCodecFactory} implementations it was constructed with. + */ +public class FallbackCodecFactory implements CompressionCodecFactory { + + private final CompressionCodecFactory[] codecFactories; + + /** + * Constructs a FallbackCodecFactory using other {@link CompressionCodecFactory} implementations. + * The FallbackCodecFactory recognizes that a codec could not be provided by the {@link CompressionCodecFactory} implementations throwing a {@link CodecNotImplementedException}. + * + * @param codecFactories the {@link CompressionCodecFactory} implementations to delegate to, in order. + */ + public FallbackCodecFactory(CompressionCodecFactory... codecFactories) { + Preconditions.checkArgument( + codecFactories != null && codecFactories.length > 0, + "FallbackCodecFactory needs to be constructed using at least one CompressionCodecFactory to fall back on."); + this.codecFactories = codecFactories; + } + + @Override + public BytesInputCompressor getCompressor(CompressionCodecName codecName) { + for (CompressionCodecFactory codecFactory : codecFactories) { + try { + return codecFactory.getCompressor(codecName); Review Comment: What if it returns null? Should it fallback as well? ########## parquet-common/src/main/java/org/apache/parquet/compression/FallbackCodecFactory.java: ########## @@ -0,0 +1,74 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you 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.apache.parquet.compression; + +import org.apache.parquet.Preconditions; +import org.apache.parquet.hadoop.metadata.CompressionCodecName; + +/** + * {@link CompressionCodecFactory} implementation that delegates to the {@link CompressionCodecFactory} implementations it was constructed with. + */ +public class FallbackCodecFactory implements CompressionCodecFactory { + + private final CompressionCodecFactory[] codecFactories; + + /** + * Constructs a FallbackCodecFactory using other {@link CompressionCodecFactory} implementations. + * The FallbackCodecFactory recognizes that a codec could not be provided by the {@link CompressionCodecFactory} implementations throwing a {@link CodecNotImplementedException}. + * + * @param codecFactories the {@link CompressionCodecFactory} implementations to delegate to, in order. + */ + public FallbackCodecFactory(CompressionCodecFactory... codecFactories) { + Preconditions.checkArgument( + codecFactories != null && codecFactories.length > 0, + "FallbackCodecFactory needs to be constructed using at least one CompressionCodecFactory to fall back on."); + this.codecFactories = codecFactories; + } + + @Override + public BytesInputCompressor getCompressor(CompressionCodecName codecName) { + for (CompressionCodecFactory codecFactory : codecFactories) { + try { + return codecFactory.getCompressor(codecName); + } catch (CodecNotImplementedException ignored) { Review Comment: Here it won't catch `CodecNotImplementedException` unless the internal codecFactory is also a FallbackCodecFactory, which sounds weird to me. -- This is an automated message from the Apache Git Service. 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