org.apache.beam.sdk.extensions.sql.meta.provider.text.BeamTextCSVTable.java Source code

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Here is the source code for org.apache.beam.sdk.extensions.sql.meta.provider.text.BeamTextCSVTable.java

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/*
 * 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.extensions.sql.meta.provider.text;

import org.apache.beam.sdk.Pipeline;
import org.apache.beam.sdk.io.TextIO;
import org.apache.beam.sdk.schemas.Schema;
import org.apache.beam.sdk.transforms.PTransform;
import org.apache.beam.sdk.values.PBegin;
import org.apache.beam.sdk.values.PCollection;
import org.apache.beam.sdk.values.POutput;
import org.apache.beam.sdk.values.Row;
import org.apache.commons.csv.CSVFormat;

/**
 * {@code BeamTextCSVTable} is a {@code BeamTextTable} which formatted in CSV.
 *
 * <p>{@link CSVFormat} itself has many dialects, check its javadoc for more info.
 */
public class BeamTextCSVTable extends BeamTextTable {

    private String filePattern;
    private CSVFormat csvFormat;

    /** CSV table with {@link CSVFormat#DEFAULT DEFAULT} format. */
    public BeamTextCSVTable(Schema beamSchema, String filePattern) {
        this(beamSchema, filePattern, CSVFormat.DEFAULT);
    }

    public BeamTextCSVTable(Schema schema, String filePattern, CSVFormat csvFormat) {
        super(schema, filePattern);
        this.filePattern = filePattern;
        this.csvFormat = csvFormat;
    }

    @Override
    public PCollection<Row> buildIOReader(Pipeline pipeline) {
        return PBegin.in(pipeline).apply("decodeRecord", TextIO.read().from(filePattern)).apply("parseCSVLine",
                new BeamTextCSVTableIOReader(schema, filePattern, csvFormat));
    }

    @Override
    public PTransform<? super PCollection<Row>, POutput> buildIOWriter() {
        return new BeamTextCSVTableIOWriter(schema, filePattern, csvFormat);
    }

    public CSVFormat getCsvFormat() {
        return csvFormat;
    }

    public String getFilePattern() {
        return filePattern;
    }
}