org.apache.hive.beeline.SeparatedValuesOutputFormat Maven / Gradle / Ivy
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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.
*/
/*
* This source file is based on code taken from SQLLine 1.0.2
* See SQLLine notice in LICENSE
*/
package org.apache.hive.beeline;
import java.io.IOException;
import java.io.StringWriter;
import org.apache.hadoop.io.IOUtils;
import org.supercsv.io.CsvListWriter;
import org.supercsv.prefs.CsvPreference;
/**
* OutputFormat for values separated by a delimiter.
*/
class SeparatedValuesOutputFormat implements OutputFormat {
public final static String DISABLE_QUOTING_FOR_SV = "disable.quoting.for.sv";
private final BeeLine beeLine;
private CsvPreference quotedCsvPreference;
private CsvPreference unquotedCsvPreference;
SeparatedValuesOutputFormat(BeeLine beeLine, char separator) {
this.beeLine = beeLine;
unquotedCsvPreference = new CsvPreference.Builder('\0', separator, "").build();
quotedCsvPreference = new CsvPreference.Builder('"', separator, "").build();
}
private void updateCsvPreference() {
if (beeLine.getOpts().getOutputFormat().equals("dsv")) {
// check whether delimiter changed by user
char curDel = (char) getCsvPreference().getDelimiterChar();
char newDel = beeLine.getOpts().getDelimiterForDSV();
// if delimiter changed, rebuild the csv preference
if (newDel != curDel) {
// "" is passed as the end of line symbol in following function, as
// beeline itself adds newline
if (isQuotingDisabled()) {
unquotedCsvPreference = new CsvPreference.Builder('\0', newDel, "").build();
} else {
quotedCsvPreference = new CsvPreference.Builder('"', newDel, "").build();
}
}
}
}
@Override
public int print(Rows rows) {
updateCsvPreference();
int count = 0;
while (rows.hasNext()) {
if (count == 0 && !beeLine.getOpts().getShowHeader()) {
rows.next();
count++;
continue;
}
printRow((Rows.Row) rows.next());
count++;
}
return count - 1; // sans header row
}
private String getFormattedStr(String[] vals) {
StringWriter strWriter = new StringWriter();
CsvListWriter writer = new CsvListWriter(strWriter, getCsvPreference());
if (vals.length > 0) {
try {
writer.write(vals);
} catch (IOException e) {
beeLine.error(e);
} finally {
IOUtils.closeStream(writer);
}
}
return strWriter.toString();
}
private void printRow(Rows.Row row) {
String[] vals = row.values;
String formattedStr = getFormattedStr(vals);
beeLine.output(formattedStr);
}
private boolean isQuotingDisabled() {
String quotingDisabledStr = System.getProperty(SeparatedValuesOutputFormat.DISABLE_QUOTING_FOR_SV);
if (quotingDisabledStr == null || quotingDisabledStr.isEmpty()) {
// default is disabling the double quoting for separated value
return true;
}
String parsedOptionStr = quotingDisabledStr.toLowerCase();
if (parsedOptionStr.equals("false") || parsedOptionStr.equals("true")) {
return Boolean.parseBoolean(parsedOptionStr);
} else {
beeLine.error("System Property disable.quoting.for.sv is now " + parsedOptionStr
+ " which only accepts boolean value");
return true;
}
}
private CsvPreference getCsvPreference() {
if (isQuotingDisabled()) {
return unquotedCsvPreference;
} else {
return quotedCsvPreference;
}
}
}