Package org.apache.druid.java.util.common.parsers

Class AbstractFlatTextFormatParser

java.lang.Object

org.apache.druid.java.util.common.parsers.AbstractFlatTextFormatParser

All Implemented Interfaces:

Parser<String,Object>

Direct Known Subclasses:

CSVParser, DelimitedParser

public abstract class AbstractFlatTextFormatParser
extends Object
implements Parser<String,Object>

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	AbstractFlatTextFormatParser.FlatTextFormat

Constructor Summary

Constructors

Constructor	Description
AbstractFlatTextFormatParser(String listDelimiter, boolean hasHeaderRow, int maxSkipHeaderRows)

Method Summary

Modifier and Type	Method	Description
List<String>	getFieldNames()	Returns the fieldNames that we expect to see in parsed Maps, if known, or null otherwise.
String	getListDelimiter()
protected abstract List<String>	parseLine(String input)
Map<String,Object>	parseToMap(String input)	Parse a String into a Map.
void	setFieldNames(Iterable<String> fieldNames)	Set the fieldNames that you expect to see in parsed Maps.
void	setFieldNames(String header)
void	startFileFromBeginning()	This method may or may not get called at the start of reading of every file depending on the type of IndexTasks.

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractFlatTextFormatParser

public AbstractFlatTextFormatParser(@Nullable
                                    String listDelimiter,
                                    boolean hasHeaderRow,
                                    int maxSkipHeaderRows)

Method Detail

startFileFromBeginning

public void startFileFromBeginning()

Description copied from interface: Parser

This method may or may not get called at the start of reading of every file depending on the type of IndexTasks. The parser state should be reset if exists.

Specified by:

startFileFromBeginning in interface Parser<String,Object>

getListDelimiter

public String getListDelimiter()

getFieldNames

public List<String> getFieldNames()

Description copied from interface: Parser

Returns the fieldNames that we expect to see in parsed Maps, if known, or null otherwise. Deprecated; Parsers should not, in general, be expected to know what fields they will return.

Specified by:

getFieldNames in interface Parser<String,Object>

setFieldNames

public void setFieldNames(Iterable<String> fieldNames)

Description copied from interface: Parser

Set the fieldNames that you expect to see in parsed Maps. Deprecated; Parsers should not, in general, be expected to know what fields they will return. Some individual types of parsers do need to know (like a TSV parser) and those parsers have their own way of setting field names.

Specified by:

setFieldNames in interface Parser<String,Object>

setFieldNames

public void setFieldNames(String header)

parseToMap

public Map<String,Object> parseToMap(String input)

Description copied from interface: Parser

Parse a String into a Map. The result can be null which means the given input string will be ignored.

Specified by:

parseToMap in interface Parser<String,Object>

parseLine

protected abstract List<String> parseLine(String input)
                                   throws IOException

Throws:

IOException