Java tutorial
/* * 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.nifi.csv; import static org.junit.Assert.assertEquals; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.math.BigInteger; import java.nio.charset.StandardCharsets; import java.sql.Date; import java.sql.Time; import java.sql.Timestamp; import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.HashMap; import java.util.LinkedHashMap; import java.util.List; import java.util.Map; import java.util.TimeZone; import org.apache.commons.csv.CSVFormat; import org.apache.commons.csv.QuoteMode; import org.apache.nifi.schema.access.SchemaNameAsAttribute; import org.apache.nifi.serialization.SimpleRecordSchema; import org.apache.nifi.serialization.record.DataType; import org.apache.nifi.serialization.record.MapRecord; import org.apache.nifi.serialization.record.Record; import org.apache.nifi.serialization.record.RecordField; import org.apache.nifi.serialization.record.RecordFieldType; import org.apache.nifi.serialization.record.RecordSchema; import org.apache.nifi.serialization.record.RecordSet; import org.junit.Test; public class TestWriteCSVResult { @Test public void testDataTypes() throws IOException { final CSVFormat csvFormat = CSVFormat.DEFAULT.withQuoteMode(QuoteMode.ALL).withRecordSeparator("\n"); final StringBuilder headerBuilder = new StringBuilder(); final List<RecordField> fields = new ArrayList<>(); for (final RecordFieldType fieldType : RecordFieldType.values()) { if (fieldType == RecordFieldType.CHOICE) { final List<DataType> possibleTypes = new ArrayList<>(); possibleTypes.add(RecordFieldType.INT.getDataType()); possibleTypes.add(RecordFieldType.LONG.getDataType()); fields.add(new RecordField(fieldType.name().toLowerCase(), fieldType.getChoiceDataType(possibleTypes))); } else { fields.add(new RecordField(fieldType.name().toLowerCase(), fieldType.getDataType())); } headerBuilder.append('"').append(fieldType.name().toLowerCase()).append('"').append(","); } final RecordSchema schema = new SimpleRecordSchema(fields); final ByteArrayOutputStream baos = new ByteArrayOutputStream(); final long now = System.currentTimeMillis(); try (final WriteCSVResult result = new WriteCSVResult(csvFormat, schema, new SchemaNameAsAttribute(), baos, RecordFieldType.DATE.getDefaultFormat(), RecordFieldType.TIME.getDefaultFormat(), RecordFieldType.TIMESTAMP.getDefaultFormat(), true, "UTF-8")) { final Map<String, Object> valueMap = new HashMap<>(); valueMap.put("string", "abc?123"); valueMap.put("boolean", true); valueMap.put("byte", (byte) 1); valueMap.put("char", 'c'); valueMap.put("short", (short) 8); valueMap.put("int", 9); valueMap.put("bigint", BigInteger.valueOf(8L)); valueMap.put("long", 8L); valueMap.put("float", 8.0F); valueMap.put("double", 8.0D); valueMap.put("date", new Date(now)); valueMap.put("time", new Time(now)); valueMap.put("timestamp", new Timestamp(now)); valueMap.put("record", null); valueMap.put("choice", 48L); valueMap.put("array", null); final Record record = new MapRecord(schema, valueMap); final RecordSet rs = RecordSet.of(schema, record); result.write(rs); } final String output = new String(baos.toByteArray(), StandardCharsets.UTF_8); headerBuilder.deleteCharAt(headerBuilder.length() - 1); final String headerLine = headerBuilder.toString(); final String[] splits = output.split("\n"); assertEquals(2, splits.length); assertEquals(headerLine, splits[0]); final String values = splits[1]; final StringBuilder expectedBuilder = new StringBuilder(); expectedBuilder.append("\"abc?123\",\"true\",\"1\",\"c\",\"8\",\"9\",\"8\",\"8\",\"8.0\",\"8.0\","); final String dateValue = getDateFormat(RecordFieldType.DATE.getDefaultFormat()).format(now); final String timeValue = getDateFormat(RecordFieldType.TIME.getDefaultFormat()).format(now); final String timestampValue = getDateFormat(RecordFieldType.TIMESTAMP.getDefaultFormat()).format(now); expectedBuilder.append('"').append(dateValue).append('"').append(','); expectedBuilder.append('"').append(timeValue).append('"').append(','); expectedBuilder.append('"').append(timestampValue).append('"').append(','); expectedBuilder.append(",\"48\",,"); final String expectedValues = expectedBuilder.toString(); assertEquals(expectedValues, values); } @Test public void testExtraFieldInWriteRecord() throws IOException { final CSVFormat csvFormat = CSVFormat.DEFAULT.withEscape('\\').withQuoteMode(QuoteMode.NONE) .withRecordSeparator("\n"); final List<RecordField> fields = new ArrayList<>(); fields.add(new RecordField("id", RecordFieldType.STRING.getDataType())); final RecordSchema schema = new SimpleRecordSchema(fields); final Map<String, Object> values = new HashMap<>(); values.put("id", "1"); values.put("name", "John"); final Record record = new MapRecord(schema, values); final ByteArrayOutputStream baos = new ByteArrayOutputStream(); final String output; try (final WriteCSVResult writer = new WriteCSVResult(csvFormat, schema, new SchemaNameAsAttribute(), baos, RecordFieldType.DATE.getDefaultFormat(), RecordFieldType.TIME.getDefaultFormat(), RecordFieldType.TIMESTAMP.getDefaultFormat(), true, "ASCII")) { writer.beginRecordSet(); writer.write(record); writer.finishRecordSet(); writer.flush(); output = baos.toString(); } assertEquals("id\n1\n", output); } @Test public void testExtraFieldInWriteRawRecord() throws IOException { final CSVFormat csvFormat = CSVFormat.DEFAULT.withEscape('\\').withQuoteMode(QuoteMode.NONE) .withRecordSeparator("\n"); final List<RecordField> fields = new ArrayList<>(); fields.add(new RecordField("id", RecordFieldType.STRING.getDataType())); final RecordSchema schema = new SimpleRecordSchema(fields); final Map<String, Object> values = new LinkedHashMap<>(); values.put("id", "1"); values.put("name", "John"); final Record record = new MapRecord(schema, values); final ByteArrayOutputStream baos = new ByteArrayOutputStream(); final String output; try (final WriteCSVResult writer = new WriteCSVResult(csvFormat, schema, new SchemaNameAsAttribute(), baos, RecordFieldType.DATE.getDefaultFormat(), RecordFieldType.TIME.getDefaultFormat(), RecordFieldType.TIMESTAMP.getDefaultFormat(), true, "ASCII")) { writer.beginRecordSet(); writer.writeRawRecord(record); writer.finishRecordSet(); writer.flush(); output = baos.toString(); } assertEquals("id,name\n1,John\n", output); } @Test public void testMissingFieldWriteRecord() throws IOException { final CSVFormat csvFormat = CSVFormat.DEFAULT.withEscape('\\').withQuoteMode(QuoteMode.NONE) .withRecordSeparator("\n"); final List<RecordField> fields = new ArrayList<>(); fields.add(new RecordField("id", RecordFieldType.STRING.getDataType())); fields.add(new RecordField("name", RecordFieldType.STRING.getDataType())); final RecordSchema schema = new SimpleRecordSchema(fields); final Map<String, Object> values = new LinkedHashMap<>(); values.put("id", "1"); final Record record = new MapRecord(schema, values); final ByteArrayOutputStream baos = new ByteArrayOutputStream(); final String output; try (final WriteCSVResult writer = new WriteCSVResult(csvFormat, schema, new SchemaNameAsAttribute(), baos, RecordFieldType.DATE.getDefaultFormat(), RecordFieldType.TIME.getDefaultFormat(), RecordFieldType.TIMESTAMP.getDefaultFormat(), true, "ASCII")) { writer.beginRecordSet(); writer.writeRecord(record); writer.finishRecordSet(); writer.flush(); output = baos.toString(); } assertEquals("id,name\n1,\n", output); } @Test public void testMissingFieldWriteRawRecord() throws IOException { final CSVFormat csvFormat = CSVFormat.DEFAULT.withEscape('\\').withQuoteMode(QuoteMode.NONE) .withRecordSeparator("\n"); final List<RecordField> fields = new ArrayList<>(); fields.add(new RecordField("id", RecordFieldType.STRING.getDataType())); fields.add(new RecordField("name", RecordFieldType.STRING.getDataType())); final RecordSchema schema = new SimpleRecordSchema(fields); final Map<String, Object> values = new LinkedHashMap<>(); values.put("id", "1"); final Record record = new MapRecord(schema, values); final ByteArrayOutputStream baos = new ByteArrayOutputStream(); final String output; try (final WriteCSVResult writer = new WriteCSVResult(csvFormat, schema, new SchemaNameAsAttribute(), baos, RecordFieldType.DATE.getDefaultFormat(), RecordFieldType.TIME.getDefaultFormat(), RecordFieldType.TIMESTAMP.getDefaultFormat(), true, "ASCII")) { writer.beginRecordSet(); writer.writeRawRecord(record); writer.finishRecordSet(); writer.flush(); output = baos.toString(); } assertEquals("id,name\n1,\n", output); } @Test public void testMissingAndExtraFieldWriteRecord() throws IOException { final CSVFormat csvFormat = CSVFormat.DEFAULT.withEscape('\\').withQuoteMode(QuoteMode.NONE) .withRecordSeparator("\n"); final List<RecordField> fields = new ArrayList<>(); fields.add(new RecordField("id", RecordFieldType.STRING.getDataType())); fields.add(new RecordField("name", RecordFieldType.STRING.getDataType())); final RecordSchema schema = new SimpleRecordSchema(fields); final Map<String, Object> values = new LinkedHashMap<>(); values.put("id", "1"); values.put("dob", "1/1/1970"); final Record record = new MapRecord(schema, values); final ByteArrayOutputStream baos = new ByteArrayOutputStream(); final String output; try (final WriteCSVResult writer = new WriteCSVResult(csvFormat, schema, new SchemaNameAsAttribute(), baos, RecordFieldType.DATE.getDefaultFormat(), RecordFieldType.TIME.getDefaultFormat(), RecordFieldType.TIMESTAMP.getDefaultFormat(), true, "ASCII")) { writer.beginRecordSet(); writer.writeRecord(record); writer.finishRecordSet(); writer.flush(); output = baos.toString(); } assertEquals("id,name\n1,\n", output); } @Test public void testMissingAndExtraFieldWriteRawRecord() throws IOException { final CSVFormat csvFormat = CSVFormat.DEFAULT.withEscape('\\').withQuoteMode(QuoteMode.NONE) .withRecordSeparator("\n"); final List<RecordField> fields = new ArrayList<>(); fields.add(new RecordField("id", RecordFieldType.STRING.getDataType())); fields.add(new RecordField("name", RecordFieldType.STRING.getDataType())); final RecordSchema schema = new SimpleRecordSchema(fields); final Map<String, Object> values = new LinkedHashMap<>(); values.put("id", "1"); values.put("dob", "1/1/1970"); final Record record = new MapRecord(schema, values); final ByteArrayOutputStream baos = new ByteArrayOutputStream(); final String output; try (final WriteCSVResult writer = new WriteCSVResult(csvFormat, schema, new SchemaNameAsAttribute(), baos, RecordFieldType.DATE.getDefaultFormat(), RecordFieldType.TIME.getDefaultFormat(), RecordFieldType.TIMESTAMP.getDefaultFormat(), true, "ASCII")) { writer.beginRecordSet(); writer.writeRawRecord(record); writer.finishRecordSet(); writer.flush(); output = baos.toString(); } assertEquals("id,dob,name\n1,1/1/1970,\n", output); } private DateFormat getDateFormat(final String format) { final DateFormat df = new SimpleDateFormat(format); df.setTimeZone(TimeZone.getTimeZone("gmt")); return df; } }