org.apache.shardingsphere.sql.parser.core.extractor.util

Class ExtractorUtils

java.lang.Object

org.apache.shardingsphere.sql.parser.core.extractor.util.ExtractorUtils

public final class ExtractorUtils
extends Object

Extractor utility.

Author:

duhongjun

Constructor Summary

Constructors

Constructor and Description
ExtractorUtils()

Method Summary

Modifier and Type	Method and Description
static com.google.common.base.Optional<org.antlr.v4.runtime.ParserRuleContext>	findFirstChildNode(org.antlr.v4.runtime.ParserRuleContext node, RuleName ruleName) Find first child node.
static com.google.common.base.Optional<org.antlr.v4.runtime.ParserRuleContext>	findFirstChildNodeNoneRecursive(org.antlr.v4.runtime.ParserRuleContext node, RuleName ruleName) Find first child node none recursive.
static com.google.common.base.Optional<org.antlr.v4.runtime.ParserRuleContext>	findSingleNodeFromFirstDescendant(org.antlr.v4.runtime.ParserRuleContext node, RuleName ruleName) Find single node from first descendant which only has one child.
static Collection<org.antlr.v4.runtime.ParserRuleContext>	getAllDescendantNodes(org.antlr.v4.runtime.ParserRuleContext node, RuleName ruleName) Get all descendant nodes.
static org.antlr.v4.runtime.ParserRuleContext	getFirstChildNode(org.antlr.v4.runtime.ParserRuleContext node, RuleName ruleName) Get first child node.

Methods inherited from class java.lang.Object

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

Constructor Detail

ExtractorUtils

public ExtractorUtils()

Method Detail

getFirstChildNode

public static org.antlr.v4.runtime.ParserRuleContext getFirstChildNode(org.antlr.v4.runtime.ParserRuleContext node,
                                                                       RuleName ruleName)

Get first child node.

Parameters:

node - start node

ruleName - rule name

Returns:

matched node

findFirstChildNode

public static com.google.common.base.Optional<org.antlr.v4.runtime.ParserRuleContext> findFirstChildNode(org.antlr.v4.runtime.ParserRuleContext node,
                                                                                                         RuleName ruleName)

Find first child node.

Parameters:

node - start node

ruleName - rule name

Returns:

matched node

findFirstChildNodeNoneRecursive

public static com.google.common.base.Optional<org.antlr.v4.runtime.ParserRuleContext> findFirstChildNodeNoneRecursive(org.antlr.v4.runtime.ParserRuleContext node,
                                                                                                                      RuleName ruleName)

Find first child node none recursive.

Parameters:

node - start node

ruleName - rule name

Returns:

matched node

findSingleNodeFromFirstDescendant

public static com.google.common.base.Optional<org.antlr.v4.runtime.ParserRuleContext> findSingleNodeFromFirstDescendant(org.antlr.v4.runtime.ParserRuleContext node,
                                                                                                                        RuleName ruleName)

Find single node from first descendant which only has one child.

Parameters:

node - start node

ruleName - rule name

Returns:

matched node

getAllDescendantNodes

public static Collection<org.antlr.v4.runtime.ParserRuleContext> getAllDescendantNodes(org.antlr.v4.runtime.ParserRuleContext node,
                                                                                       RuleName ruleName)

Get all descendant nodes.

Parameters:

node - start node

ruleName - rule name

Returns:

all descendant nodes