io.prestosql.operator.scalar

Class JsonExtract.ObjectFieldJsonExtractor<T>

java.lang.Object

io.prestosql.operator.scalar.JsonExtract.ObjectFieldJsonExtractor<T>

All Implemented Interfaces:

JsonExtract.JsonExtractor<T>

Enclosing class:

JsonExtract

public static class JsonExtract.ObjectFieldJsonExtractor<T>
extends Object
implements JsonExtract.JsonExtractor<T>

Constructor Summary

Constructors

Constructor and Description
ObjectFieldJsonExtractor(String fieldName, JsonExtract.JsonExtractor<? extends T> delegate)
ObjectFieldJsonExtractor(String fieldName, JsonExtract.JsonExtractor<? extends T> delegate, boolean exceptionOnOutOfBounds)

Method Summary

Modifier and Type	Method and Description
T	extract(com.fasterxml.jackson.core.JsonParser jsonParser) Executes the extraction on the existing content of the JsonParser and outputs the match.
T	processJsonArray(com.fasterxml.jackson.core.JsonParser jsonParser)
T	processJsonObject(com.fasterxml.jackson.core.JsonParser jsonParser)

Methods inherited from class java.lang.Object

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

Constructor Detail

ObjectFieldJsonExtractor

public ObjectFieldJsonExtractor(String fieldName,
                                JsonExtract.JsonExtractor<? extends T> delegate)

ObjectFieldJsonExtractor

public ObjectFieldJsonExtractor(String fieldName,
                                JsonExtract.JsonExtractor<? extends T> delegate,
                                boolean exceptionOnOutOfBounds)

Method Detail

extract

public T extract(com.fasterxml.jackson.core.JsonParser jsonParser)
          throws IOException

Description copied from interface: JsonExtract.JsonExtractor

Executes the extraction on the existing content of the JsonParser and outputs the match.

Notes:

• JsonParser must be on the FIRST token of the value to be processed when extract is called
• INVARIANT: when extract() returns, the current token of the parser will be the LAST token of the value

Specified by:

extract in interface JsonExtract.JsonExtractor<T>

Returns:

the value, or null if not applicable

Throws:

IOException

processJsonObject

public T processJsonObject(com.fasterxml.jackson.core.JsonParser jsonParser)
                    throws IOException

Throws:

IOException

processJsonArray

public T processJsonArray(com.fasterxml.jackson.core.JsonParser jsonParser)
                   throws IOException

Throws:

IOException