org.apache.shardingsphere.core.parse.antlr.extractor.impl.dml.select

Class SubqueryExtractor

java.lang.Object

org.apache.shardingsphere.core.parse.antlr.extractor.impl.dml.select.SubqueryExtractor

All Implemented Interfaces:

OptionalSQLSegmentExtractor, SQLSegmentExtractor

public final class SubqueryExtractor
extends Object
implements OptionalSQLSegmentExtractor

Subquery extractor.

Author:

duhongjun

Constructor Summary

Constructors

Constructor and Description
SubqueryExtractor()

Method Summary

Modifier and Type	Method and Description
com.google.common.base.Optional<SubquerySegment>	extract(org.antlr.v4.runtime.ParserRuleContext subqueryNode) Extract SQL segment from SQL AST.

Methods inherited from class java.lang.Object

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

Constructor Detail

SubqueryExtractor

public SubqueryExtractor()

Method Detail

extract

public com.google.common.base.Optional<SubquerySegment> extract(org.antlr.v4.runtime.ParserRuleContext subqueryNode)

Description copied from interface: OptionalSQLSegmentExtractor

Extract SQL segment from SQL AST.

Specified by:

extract in interface OptionalSQLSegmentExtractor

Parameters:

subqueryNode - ancestor node of AST

Returns:

SQL segment