com.streamsets.pipeline.lib.csv.TestCsvParser.java Source code

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Here is the source code for com.streamsets.pipeline.lib.csv.TestCsvParser.java

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/**
 * Copyright 2015 StreamSets Inc.
 *
 * Licensed under 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 com.streamsets.pipeline.lib.csv;

import com.streamsets.pipeline.lib.io.CountingReader;
import com.streamsets.pipeline.lib.io.ObjectLengthException;
import com.streamsets.pipeline.lib.io.OverrunReader;
import org.apache.commons.csv.CSVFormat;
import org.junit.Assert;
import org.junit.Test;

import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.StringReader;

public class TestCsvParser {

    private OverrunReader getReader(String name) throws Exception {
        InputStream is = Thread.currentThread().getContextClassLoader().getResourceAsStream(name);
        return (is != null) ? new OverrunReader(new InputStreamReader(is), 0, false, false) : null;
    }

    @Test
    public void testParserNoHeaders() throws Exception {
        CsvParser parser = new CsvParser(getReader("TestCsvParser-default.csv"), CSVFormat.DEFAULT, -1);
        Assert.assertArrayEquals(null, parser.getHeaders());
    }

    @Test
    public void testParserHeaders() throws Exception {
        CsvParser parser = new CsvParser(getReader("TestCsvParser-default.csv"),
                CSVFormat.DEFAULT.withHeader((String[]) null).withSkipHeaderRecord(true), -1);
        try {
            Assert.assertArrayEquals(new String[] { "h1", "h2", "h3", "h4" }, parser.getHeaders());
        } finally {
            parser.close();
        }
    }

    @Test
    public void testParserRecords() throws Exception {
        CsvParser parser = new CsvParser(getReader("TestCsvParser-default.csv"),
                CSVFormat.DEFAULT.withHeader((String[]) null).withSkipHeaderRecord(true), -1);
        try {
            Assert.assertEquals(12, parser.getReaderPosition());

            String[] record = parser.read();
            Assert.assertEquals(20, parser.getReaderPosition());
            Assert.assertNotNull(record);
            Assert.assertArrayEquals(new String[] { "a", "b", "c", "d" }, record);

            record = parser.read();
            Assert.assertEquals(33, parser.getReaderPosition());
            Assert.assertNotNull(record);
            Assert.assertArrayEquals(new String[] { "w", "x", "y", "z", "extra" }, record);

            Assert.assertNull(parser.read());
            Assert.assertEquals(33, parser.getReaderPosition());
        } finally {
            parser.close();
        }
    }

    @Test
    public void testParserRecordsFromOffset() throws Exception {
        CsvParser parser = new CsvParser(getReader("TestCsvParser-default.csv"),
                CSVFormat.DEFAULT.withHeader((String[]) null).withSkipHeaderRecord(true), -1, 12, 0);
        try {
            Assert.assertEquals(12, parser.getReaderPosition());

            String[] record = parser.read();
            Assert.assertEquals(20, parser.getReaderPosition());
            Assert.assertNotNull(record);
            Assert.assertArrayEquals(new String[] { "a", "b", "c", "d" }, record);

            record = parser.read();
            Assert.assertEquals(33, parser.getReaderPosition());
            Assert.assertNotNull(record);
            Assert.assertArrayEquals(new String[] { "w", "x", "y", "z", "extra" }, record);

            Assert.assertNull(parser.read());
            Assert.assertEquals(33, parser.getReaderPosition());
        } finally {
            parser.close();
        }
        parser = new CsvParser(getReader("TestCsvParser-default.csv"),
                CSVFormat.DEFAULT.withHeader((String[]) null).withSkipHeaderRecord(true), -1, 20, 0);
        try {
            Assert.assertEquals(20, parser.getReaderPosition());

            String[] record = parser.read();
            Assert.assertEquals(33, parser.getReaderPosition());
            Assert.assertNotNull(record);
            Assert.assertArrayEquals(new String[] { "w", "x", "y", "z", "extra" }, record);

            Assert.assertNull(parser.read());
            Assert.assertEquals(33, parser.getReaderPosition());
        } finally {
            parser.close();
        }
    }

    @Test
    public void testMaxObjectLen() throws Exception {
        CsvParser parser = new CsvParser(new StringReader("a,b,c\naa,bb,cc\ne,f,g\n"),
                CSVFormat.DEFAULT.withHeader((String[]) null).withSkipHeaderRecord(false), 6);
        try {
            Assert.assertEquals(0, parser.getReaderPosition());

            String[] record = parser.read();
            Assert.assertEquals(6, parser.getReaderPosition());
            Assert.assertNotNull(record);
            Assert.assertArrayEquals(new String[] { "a", "b", "c" }, record);

            try {
                parser.read();
                Assert.fail();
            } catch (ObjectLengthException ex) {
            }
            Assert.assertEquals(15, parser.getReaderPosition());
            record = parser.read();
            Assert.assertNotNull(record);
            Assert.assertArrayEquals(new String[] { "e", "f", "g" }, record);
            Assert.assertNull(parser.read());
        } finally {
            parser.close();
        }
    }

    @Test
    public void testSkipLines() throws Exception {
        CsvParser parser = new CsvParser(
                new CountingReader(new StringReader("foo\nbar\r\na,b,c\naa,bb,cc\ne,f,g\n")),
                CSVFormat.DEFAULT.withHeader((String[]) null).withSkipHeaderRecord(false), -1, 0, 2);
        try {
            Assert.assertEquals(9, parser.getReaderPosition());

            String[] record = parser.read();
            Assert.assertEquals(15, parser.getReaderPosition());
            Assert.assertNotNull(record);
            Assert.assertArrayEquals(new String[] { "a", "b", "c" }, record);
            record = parser.read();
            Assert.assertNotNull(record);
            Assert.assertArrayEquals(new String[] { "aa", "bb", "cc" }, record);
            Assert.assertEquals(24, parser.getReaderPosition());
            record = parser.read();
            Assert.assertNotNull(record);
            Assert.assertArrayEquals(new String[] { "e", "f", "g" }, record);
            Assert.assertEquals(30, parser.getReaderPosition());
            record = parser.read();
            Assert.assertNull(record);
            Assert.assertEquals(30, parser.getReaderPosition());
        } finally {
            parser.close();
        }
    }
}