Package org.apache.drill.exec.store.easy.json.values

Class ScalarListener

java.lang.Object

org.apache.drill.exec.store.easy.json.values.ScalarListener

All Implemented Interfaces:

ValueListener

Direct Known Subclasses:

BigIntListener, BinaryValueListener, BooleanListener, DateValueListener, DecimalValueListener, DoubleListener, IntervalValueListener, StrictBigIntValueListener, StrictDoubleValueListener, StrictIntValueListener, StrictStringValueListener, TimestampValueListener, TimeValueListener, UtcDateValueListener, UtcTimestampValueListener, VarCharListener

public abstract class ScalarListener
extends Object
implements ValueListener

Base class for scalar field listeners

Field Summary

Fields

Modifier and Type	Field	Description
protected final boolean	isArray
protected final JsonLoaderImpl	loader
protected final ScalarWriter	writer

Constructor Summary

Constructors

Constructor	Description
ScalarListener(JsonLoaderImpl loader, ScalarWriter writer)

Method Summary

Modifier and Type	Method	Description
protected void	addValueToListenerMap(String key, Object value)
protected void	addValueToListenerMap(String key, String value)	Adds a field's most recent value to the column listener map.
void	onText(String value)	Called when a parser converts a JSON structure to text rather than delivering the token directly.
void	onValue(com.fasterxml.jackson.core.JsonToken token, TokenIterator tokenizer)	Called for a JSON scalar token.
ColumnMetadata	schema()
protected void	setArrayNull()
protected void	setNull()
protected UserException	typeConversionError(String jsonType)

Methods inherited from class java.lang.Object

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

Field Details

loader

protected final JsonLoaderImpl loader

writer

protected final ScalarWriter writer

isArray

protected final boolean isArray

Constructor Details

ScalarListener

public ScalarListener(JsonLoaderImpl loader,
 ScalarWriter writer)

Method Details

schema

public ColumnMetadata schema()

onValue

public void onValue(com.fasterxml.jackson.core.JsonToken token,
 TokenIterator tokenizer)

Description copied from interface: ValueListener

Called for a JSON scalar token.

Specified by:

onValue in interface ValueListener

Parameters:

token - the scalar token

tokenizer - provides access to the value of the token

onText

public void onText(String value)

Description copied from interface: ValueListener

Called when a parser converts a JSON structure to text rather than delivering the token directly.

Specified by:

onText in interface ValueListener

Parameters:

value - the string value of the parsed token or structure

setNull

protected void setNull()

setArrayNull

protected void setArrayNull()

typeConversionError

protected UserException typeConversionError(String jsonType)

addValueToListenerMap

protected void addValueToListenerMap(String key,
 String value)

Adds a field's most recent value to the column listener map. This data is only stored if the listener column map is defined, and has keys.

Parameters:

key - The key of the listener field

value - The value of to be retained

addValueToListenerMap

protected void addValueToListenerMap(String key,
 Object value)