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csv-serde
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Added line end delimiter and null string support

master
Abhinav Sarkar 2014-06-07 17:07:38 +05:30
parent f315c1ae4b
commit 8daf918fc8
1 changed files with 50 additions and 49 deletions
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39
src/main/java/com/bizo/hive/serde/csv/CSVSerde.java
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@ -1,15 +1,7 @@
package com.bizo.hive.serde.csv;
import java.io.CharArrayReader;
import java.io.IOException;
import java.io.Reader;
import java.io.StringWriter;
import java.io.Writer;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Properties;
import au.com.bytecode.opencsv.CSVReader;
import au.com.bytecode.opencsv.CSVWriter;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hive.serde.Constants;
import org.apache.hadoop.hive.serde2.SerDe;
@ -26,8 +18,11 @@ import org.apache.hadoop.hive.serde2.typeinfo.TypeInfoUtils;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.Writable;
import au.com.bytecode.opencsv.CSVReader;
import au.com.bytecode.opencsv.CSVWriter;
import java.io.*;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Properties;
/**
@ -45,7 +40,8 @@ public final class CSVSerde implements SerDe {
private char separatorChar;
private char quoteChar;
private char escapeChar;
private String lineEnd;
private String nullDefinedAs;
@Override
public void initialize(final Configuration conf, final Properties tbl) throws SerDeException {
@ -71,6 +67,8 @@ public final class CSVSerde implements SerDe {
separatorChar = getProperty(tbl, "separatorChar", CSVWriter.DEFAULT_SEPARATOR);
quoteChar = getProperty(tbl, "quoteChar", CSVWriter.DEFAULT_QUOTE_CHARACTER);
escapeChar = getProperty(tbl, "escapeChar", CSVWriter.DEFAULT_ESCAPE_CHARACTER);
lineEnd = tbl.getProperty("lineEnd", CSVWriter.DEFAULT_LINE_END);
nullDefinedAs = tbl.getProperty("nullDefinedAs", "\\N");
}
private final char getProperty(final Properties tbl, final String property, final char def) {
@ -104,10 +102,13 @@ public final class CSVSerde implements SerDe {
// Convert the field to Java class String, because objects of String type
// can be stored in String, Text, or some other classes.
outputFields[c] = fieldStringOI.getPrimitiveJavaObject(field);
if (outputFields[c] == null) {
outputFields[c] = nullDefinedAs;
}
}
final StringWriter writer = new StringWriter();
final CSVWriter csv = newWriter(writer, separatorChar, quoteChar, escapeChar);
final CSVWriter csv = newWriter(writer, separatorChar, quoteChar, escapeChar, lineEnd);
try {
csv.writeNext(outputFields);
@ -130,7 +131,7 @@ public final class CSVSerde implements SerDe {
for (int i=0; i< numCols; i++) {
if (read != null && i < read.length) {
row.set(i, read[i]);
row.set(i, read[i] == nullDefinedAs ? null : read[i]);
} else {
row.set(i, null);
}
@ -150,7 +151,7 @@ public final class CSVSerde implements SerDe {
}
}
private CSVReader newReader(final Reader reader, char separator, char quote, char escape) {
private static CSVReader newReader(final Reader reader, char separator, char quote, char escape) {
// CSVReader will throw an exception if any of separator, quote, or escape is the same, but
// the CSV format specifies that the escape character and quote char are the same... very weird
if (CSVWriter.DEFAULT_ESCAPE_CHARACTER == escape) {
@ -160,11 +161,11 @@ public final class CSVSerde implements SerDe {
}
}
private CSVWriter newWriter(final Writer writer, char separator, char quote, char escape) {
private static CSVWriter newWriter(final Writer writer, char separator, char quote, char escape, String lineEnd) {
if (CSVWriter.DEFAULT_ESCAPE_CHARACTER == escape) {
return new CSVWriter(writer, separator, quote, "");
return new CSVWriter(writer, separator, quote, lineEnd);
} else {
return new CSVWriter(writer, separator, quote, escape, "");
return new CSVWriter(writer, separator, quote, escape, lineEnd);
}
}