org.apache.hadoop.hive.ql.parse

Class UnparseTranslator

java.lang.Object

org.apache.hadoop.hive.ql.parse.UnparseTranslator

public class UnparseTranslator
extends Object

UnparseTranslator is used to "unparse" objects such as views when their definition is stored. It has a translations map where its possible to replace all the text with the appropriate escaped version [say invites.ds will be replaced with `invites`.`ds` and the entire query is processed like this and stored as Extended text in table's metadata]. This holds all individual translations and where they apply in the stream. The unparse is lazy and happens when SemanticAnalyzer.saveViewDefinition() calls TokenRewriteStream.toString().

Constructor Summary

Constructors

Constructor and Description
UnparseTranslator(org.apache.hadoop.conf.Configuration conf)

Method Summary

Modifier and Type	Method and Description
void	addCopyTranslation(ASTNode targetNode, ASTNode sourceNode) Register a "copy" translation in which a node will be translated into whatever the translation turns out to be for another node (after previously registered translations have already been performed).
void	addDefaultValueTranslation(ASTNode exprNode, String defaultValue)
void	addIdentifierTranslation(ASTNode identifier) Register a translation for an identifier.
void	addTableNameTranslation(ASTNode tableName, String currentDatabaseName) Register a translation for an tabName.
void	clear()

Methods inherited from class java.lang.Object

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

Constructor Detail

UnparseTranslator

public UnparseTranslator(org.apache.hadoop.conf.Configuration conf)

Method Detail

addTableNameTranslation

public void addTableNameTranslation(ASTNode tableName,
                                    String currentDatabaseName)

Register a translation for an tabName.

Parameters:

tableName - source node (which must be an tabName) to be replaced

addIdentifierTranslation

public void addIdentifierTranslation(ASTNode identifier)

Register a translation for an identifier.

Parameters:

identifier - source node (which must be an identifier) to be replaced

addDefaultValueTranslation

public void addDefaultValueTranslation(ASTNode exprNode,
                                       String defaultValue)

addCopyTranslation

public void addCopyTranslation(ASTNode targetNode,
                               ASTNode sourceNode)

Register a "copy" translation in which a node will be translated into whatever the translation turns out to be for another node (after previously registered translations have already been performed). Deferred translations are performed in the order they are registered, and follow the same rules regarding overlap as non-copy translations.

Parameters:

targetNode - node whose subtree is to be replaced

sourceNode - the node providing the replacement text

clear

public void clear()