Parser (druid-processing 28.0.0 API)

All Known Implementing Classes:

AbstractFlatTextFormatParser, CSVParser, DelimitedParser, JavaScriptParser, JSONPathParser, JSONToLowerParser, RegexParser
```
public interface Parser<K,V>
```
Class that can parse Strings into Maps. Not thread-safe.

Method Summary

All Methods Instance Methods Abstract Methods Default Methods Deprecated Methods
Modifier and Type	Method	Description
`List<String>`	`getFieldNames()`	Deprecated.
`Map<K,V>`	`parseToMap(String input)`	Parse a String into a Map.
`void`	`setFieldNames(Iterable<String> fieldNames)`	Deprecated.
`default void`	`startFileFromBeginning()`	This method may or may not get called at the start of reading of every file depending on the type of IndexTasks.

- Method Detail
  - startFileFromBeginning
```
default void startFileFromBeginning()
```
    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.
  - parseToMap
```
@Nullable
Map<K,V> parseToMap(String input)
```
    Parse a String into a Map. The result can be null which means the given input string will be ignored.
    
    Throws:
    
    ParseException - if the String cannot be parsed
  - setFieldNames
```
@Deprecated
void setFieldNames(Iterable<String> fieldNames)
```
    Deprecated.
    
    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.
  - getFieldNames
```
@Deprecated
List<String> getFieldNames()
```
    Deprecated.
    
    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.