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[CsvIO] update error and result handling. (#32023)
Co-authored-by: Lahari Guduru <108150650+lahariguduru@users.noreply.github.com>
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sdks/java/io/csv/src/main/java/org/apache/beam/sdk/io/csv/CsvIOParseResult.java
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|---|---|---|
| @@ -0,0 +1,100 @@ | ||
| /* | ||
| * 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.beam.sdk.io.csv; | ||
|
|
||
| import java.util.Map; | ||
| import org.apache.beam.sdk.Pipeline; | ||
| import org.apache.beam.sdk.coders.Coder; | ||
| import org.apache.beam.sdk.transforms.PTransform; | ||
| import org.apache.beam.sdk.values.PCollection; | ||
| import org.apache.beam.sdk.values.PCollectionTuple; | ||
| import org.apache.beam.sdk.values.PInput; | ||
| import org.apache.beam.sdk.values.POutput; | ||
| import org.apache.beam.sdk.values.PValue; | ||
| import org.apache.beam.sdk.values.TupleTag; | ||
| import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableMap; | ||
|
|
||
| /** | ||
| * The {@link T} and {@link CsvIOParseError} {@link PCollection} results of parsing CSV records. Use | ||
| * {@link #getOutput()} and {@link #getErrors()} to apply these results in a pipeline. | ||
| */ | ||
| public class CsvIOParseResult<T> implements POutput { | ||
|
|
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| static <T> CsvIOParseResult<T> of( | ||
| TupleTag<T> outputTag, | ||
| Coder<T> outputCoder, | ||
| TupleTag<CsvIOParseError> errorTag, | ||
| PCollectionTuple pct) { | ||
| return new CsvIOParseResult<>(outputTag, outputCoder, errorTag, pct); | ||
| } | ||
|
|
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| static <T> CsvIOParseResult<T> empty(Pipeline pipeline, Coder<T> outputCoder) { | ||
| return new CsvIOParseResult<>( | ||
| new TupleTag<T>() {}, | ||
| outputCoder, | ||
| new TupleTag<CsvIOParseError>() {}, | ||
| PCollectionTuple.empty(pipeline)); | ||
| } | ||
|
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| private final Pipeline pipeline; | ||
| private final TupleTag<T> outputTag; | ||
| private final PCollection<T> output; | ||
| private final TupleTag<CsvIOParseError> errorTag; | ||
| private final PCollection<CsvIOParseError> errors; | ||
|
|
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| private CsvIOParseResult( | ||
| TupleTag<T> outputTag, | ||
| Coder<T> outputCoder, | ||
| TupleTag<CsvIOParseError> errorTag, | ||
| PCollectionTuple pct) { | ||
| this.outputTag = outputTag; | ||
| this.errorTag = errorTag; | ||
| this.pipeline = pct.getPipeline(); | ||
| this.output = pct.get(outputTag).setCoder(outputCoder); | ||
| this.errors = pct.get(errorTag).setCoder(CsvIOParseError.CODER); | ||
| } | ||
|
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| /** The {@link T} {@link PCollection} as a result of successfully parsing CSV records. */ | ||
| public PCollection<T> getOutput() { | ||
| return output; | ||
| } | ||
|
|
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| /** | ||
| * The {@link CsvIOParseError} {@link PCollection} as a result of errors associated with parsing | ||
| * CSV records. | ||
| */ | ||
| public PCollection<CsvIOParseError> getErrors() { | ||
| return errors; | ||
| } | ||
|
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| @Override | ||
| public Pipeline getPipeline() { | ||
| return pipeline; | ||
| } | ||
|
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| @Override | ||
| public Map<TupleTag<?>, PValue> expand() { | ||
| return ImmutableMap.of( | ||
| outputTag, output, | ||
| errorTag, errors); | ||
| } | ||
|
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| @Override | ||
| public void finishSpecifyingOutput( | ||
| String transformName, PInput input, PTransform<?, ?> transform) {} | ||
| } |
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