com.univocity.parsers.csv

Class CsvParser

java.lang.Object

com.univocity.parsers.common.AbstractParser<CsvParserSettings>

com.univocity.parsers.csv.CsvParser

public final class CsvParser
extends AbstractParser<CsvParserSettings>

A very fast CSV parser implementation.

Author:

Univocity Software Pty Ltd - parsers@univocity.com

See Also:

CsvFormat, CsvParserSettings, CsvWriter, AbstractParser

Field Summary

Fields inherited from class com.univocity.parsers.common.AbstractParser

ch, comment, comments, context, ignoreLeadingWhitespace, ignoreTrailingWhitespace, input, lastComment, output, processor, settings, whitespaceRangeStart

Constructor Summary

Constructors

Constructor and Description
CsvParser(CsvParserSettings settings) The CsvParser supports all settings provided by CsvParserSettings, and requires this configuration to be properly initialized.

Method Summary

Modifier and Type	Method and Description
protected boolean	consumeValueOnEOF() Allows the parser implementation to handle any value that was being consumed when the end of the input was reached
CsvFormat	getDetectedFormat() Returns the CSV format detected when one of the following settings is enabled: CommonParserSettings.isLineSeparatorDetectionEnabled() CsvParserSettings.isDelimiterDetectionEnabled() CsvParserSettings.isQuoteDetectionEnabled() The detected format will be available once the parsing process is initialized (i.e.
protected InputAnalysisProcess	getInputAnalysisProcess() Allows the parser implementation to traverse the input buffer before the parsing process starts, in order to enable automatic configuration and discovery of data formats.
protected void	parseRecord() Parser-specific implementation for reading a single record from the input.
void	updateFormat(CsvFormat format) Allows changing the format of the input on the fly.

Methods inherited from class com.univocity.parsers.common.AbstractParser

beginParsing, beginParsing, beginParsing, beginParsing, beginParsing, beginParsing, beginParsing, createParsingContext, getContext, getRecordMetadata, inComment, initialize, iterate, iterate, iterate, iterate, iterate, iterate, iterate, iterateRecords, iterateRecords, iterateRecords, iterateRecords, iterateRecords, iterateRecords, iterateRecords, parse, parse, parse, parse, parse, parse, parse, parseAll, parseAll, parseAll, parseAll, parseAll, parseAll, parseAll, parseAll, parseAll, parseAll, parseAll, parseAll, parseAll, parseAll, parseAll, parseAll, parseAllRecords, parseAllRecords, parseAllRecords, parseAllRecords, parseAllRecords, parseAllRecords, parseAllRecords, parseAllRecords, parseAllRecords, parseAllRecords, parseAllRecords, parseAllRecords, parseAllRecords, parseAllRecords, parseAllRecords, parseAllRecords, parseLine, parseNext, parseNextRecord, parseRecord, processComment, reloadHeaders, stopParsing

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

CsvParser

public CsvParser(CsvParserSettings settings)

The CsvParser supports all settings provided by CsvParserSettings, and requires this configuration to be properly initialized.

Parameters:

settings - the parser configuration

Method Detail

parseRecord

protected final void parseRecord()

Description copied from class: AbstractParser

Parser-specific implementation for reading a single record from the input.

The AbstractParser handles the initialization and processing of the input until it is ready to be parsed.

It then delegates the input to the parser-specific implementation defined by AbstractParser.parseRecord(). In general, an implementation of AbstractParser.parseRecord() will perform the following steps:

• Test the character stored in ch and take some action on it (e.g. is while (ch != '\n'){doSomething()})
• Request more characters by calling ch = input.nextChar();
• Append the desired characters to the output by executing, for example, output.appender.append(ch)
• Notify a value of the record has been fully read by executing output.valueParsed(). This will clear the output appender (CharAppender) so the next call to output.appender.append(ch) will be store the character of the next parsed value
• Rinse and repeat until all values of the record are parsed

Once the AbstractParser.parseRecord() returns, the AbstractParser takes over and handles the information (generally, reorganizing it and passing it on to a RowProcessor).

After the record processing, the AbstractParser reads the next characters from the input, delegating control again to the parseRecord() implementation for processing of the next record.

This cycle repeats until the reading process is stopped by the user, the input is exhausted, or an error happens.

In case of errors, the unchecked exception TextParsingException will be thrown and all resources in use will be closed automatically unless CommonParserSettings.isAutoClosingEnabled() evaluates to false. The exception should contain the cause and more information about where in the input the error happened.

Specified by:

parseRecord in class AbstractParser<CsvParserSettings>

See Also:

CharInputReader, CharAppender, ParserOutput, TextParsingException, RowProcessor

getInputAnalysisProcess

protected final InputAnalysisProcess getInputAnalysisProcess()

Description copied from class: AbstractParser

Allows the parser implementation to traverse the input buffer before the parsing process starts, in order to enable automatic configuration and discovery of data formats.

Overrides:

getInputAnalysisProcess in class AbstractParser<CsvParserSettings>

Returns:

a custom implementation of InputAnalysisProcess. By default, null is returned and no special input analysis will be performed.

getDetectedFormat

public final CsvFormat getDetectedFormat()

Returns the CSV format detected when one of the following settings is enabled:

• CommonParserSettings.isLineSeparatorDetectionEnabled()
• CsvParserSettings.isDelimiterDetectionEnabled()
• CsvParserSettings.isQuoteDetectionEnabled()

The detected format will be available once the parsing process is initialized (i.e. when runs.

Returns:

the detected CSV format, or null if no detection has been enabled or if the parsing process has not been started yet.

consumeValueOnEOF

protected final boolean consumeValueOnEOF()

Description copied from class: AbstractParser

Allows the parser implementation to handle any value that was being consumed when the end of the input was reached

Overrides:

consumeValueOnEOF in class AbstractParser<CsvParserSettings>

Returns:

a flag indicating whether the parser was processing a value when the end of the input was reached.

updateFormat

public final void updateFormat(CsvFormat format)

Allows changing the format of the input on the fly.

Parameters:

format - the new format to use.