adql.translator

Class PostgreSQLTranslator

java.lang.Object

adql.translator.JDBCTranslator

adql.translator.PostgreSQLTranslator

All Implemented Interfaces:

ADQLTranslator

Direct Known Subclasses:

PgSphereTranslator

public class PostgreSQLTranslator
extends JDBCTranslator

Translates all ADQL objects into an SQL interrogation query designed for PostgreSQL.

It overwrites the translation of mathematical functions whose some have a different name or signature. Besides, it is also implementing the translation of the geometrical functions. However, it does not really translate them. It is just returning the ADQL expression (by calling JDBCTranslator.getDefaultADQLFunction(ADQLFunction)). And so, of course, the execution of a SQL query containing geometrical functions and translated using this translator will not work. It is just a default implementation in case there is no interest of these geometrical functions.

Important: The geometrical functions are translated exactly as in ADQL. You will probably need to extend this translator to correctly manage the geometrical functions. An extension is already available for PgSphere: PgSphereTranslator.

Version:

1.4 (08/2016)

Author:

Grégory Mantelet (CDS;ARI)

See Also:

PgSphereTranslator

Field Summary

Fields

Modifier and Type	Field and Description
protected byte	caseSensitivity Indicate the case sensitivity to apply to each SQL identifier (only SCHEMA, TABLE and COLUMN).

Constructor Summary

Constructors

Constructor and Description
PostgreSQLTranslator() Builds a PostgreSQLTranslator which always translates in SQL all identifiers (schema, table and column) in a case sensitive manner ; in other words, schema, table and column names will be surrounded by double quotes in the SQL translation.
PostgreSQLTranslator(boolean allCaseSensitive) Builds a PostgreSQLTranslator which always translates in SQL all identifiers (schema, table and column) in the specified case sensitivity ; in other words, schema, table and column names will all be surrounded or not by double quotes in the SQL translation.
PostgreSQLTranslator(boolean catalog, boolean schema, boolean table, boolean column) Builds a PostgreSQLTranslator which will always translate in SQL identifiers with the defined case sensitivity.

Method Summary

Modifier and Type	Method and Description
DBType	convertTypeFromDB(int dbmsType, java.lang.String rawDbmsTypeName, java.lang.String dbmsTypeName, java.lang.String[] params) Convert any type provided by a JDBC driver into a type understandable by the ADQL/TAP library.
java.lang.String	convertTypeToDB(DBType type) Convert any type provided by the ADQL/TAP library into a type understandable by a JDBC driver.
boolean	isCaseSensitive(IdentifierField field) Tell whether the specified identifier MUST be translated so that being interpreted case sensitively or not.
java.lang.String	translate(AreaFunction areaFunction)
java.lang.String	translate(BoxFunction box)
java.lang.String	translate(CentroidFunction centroidFunction)
java.lang.String	translate(CircleFunction circle)
java.lang.String	translate(ContainsFunction fct)
java.lang.String	translate(DistanceFunction fct)
java.lang.String	translate(ExtractCoord extractCoord)
java.lang.String	translate(ExtractCoordSys extractCoordSys)
java.lang.String	translate(IntersectsFunction fct)
java.lang.String	translate(MathFunction fct)
java.lang.String	translate(PointFunction point)
java.lang.String	translate(PolygonFunction polygon)
java.lang.String	translate(RegionFunction region)
java.lang.String	translate(StringConstant strConst)
STCS.Region	translateGeometryFromDB(java.lang.Object jdbcColValue) Parse the given JDBC column value as a geometry object and convert it into a STCS.Region.
java.lang.Object	translateGeometryToDB(STCS.Region region) Convert the given STC region into a DB column value.

Methods inherited from class adql.translator.JDBCTranslator

appendIdentifier, appendIdentifier, getColumnName, getDefaultADQLFunction, getDefaultADQLList, getDefaultADQLList, getDefaultColumnReference, getQualifiedSchemaName, getQualifiedTableName, getTableName, translate, translate, translate, translate, translate, translate, translate, translate, translate, translate, translate, translate, translate, translate, translate, translate, translate, translate, translate, translate, translate, translate, translate, translate, translate, translate, translate, translate, translate, translate, translate

Methods inherited from class java.lang.Object

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

Field Detail

caseSensitivity

protected byte caseSensitivity

Indicate the case sensitivity to apply to each SQL identifier (only SCHEMA, TABLE and COLUMN).

Note: In this implementation, this field is set by the constructor and never modified elsewhere. It would be better to never modify it after the construction in order to keep a certain consistency.

Constructor Detail

PostgreSQLTranslator

public PostgreSQLTranslator()

Builds a PostgreSQLTranslator which always translates in SQL all identifiers (schema, table and column) in a case sensitive manner ; in other words, schema, table and column names will be surrounded by double quotes in the SQL translation.

PostgreSQLTranslator

public PostgreSQLTranslator(boolean allCaseSensitive)

Builds a PostgreSQLTranslator which always translates in SQL all identifiers (schema, table and column) in the specified case sensitivity ; in other words, schema, table and column names will all be surrounded or not by double quotes in the SQL translation.

Parameters:

allCaseSensitive - true to translate all identifiers in a case sensitive manner (surrounded by double quotes), false for case insensitivity.

PostgreSQLTranslator

public PostgreSQLTranslator(boolean catalog,
                            boolean schema,
                            boolean table,
                            boolean column)

Builds a PostgreSQLTranslator which will always translate in SQL identifiers with the defined case sensitivity.

Parameters:

catalog - true to translate catalog names with double quotes (case sensitive in the DBMS), false otherwise.

schema - true to translate schema names with double quotes (case sensitive in the DBMS), false otherwise.

table - true to translate table names with double quotes (case sensitive in the DBMS), false otherwise.

column - true to translate column names with double quotes (case sensitive in the DBMS), false otherwise.

Method Detail

isCaseSensitive

public boolean isCaseSensitive(IdentifierField field)

Description copied from class: JDBCTranslator

Tell whether the specified identifier MUST be translated so that being interpreted case sensitively or not. By default, an identifier that must be translated with case sensitivity will be surrounded by double quotes. But, if this function returns FALSE, the SQL name will be written just as given in the metadata, without double quotes.

WARNING: An IdentifierField object can be a SCHEMA, TABLE, COLUMN and ALIAS. However, in this translator, aliases are translated like in ADQL (so, with the same case sensitivity specification as in ADQL). So, this function will never be used to know the case sensitivity to apply to an alias. It is then useless to write a special behavior for the ALIAS value.

Specified by:

isCaseSensitive in class JDBCTranslator

Parameters:

field - The identifier whose the case sensitive to apply is asked.

Returns:

true if the specified identifier must be translated case sensitivity, false otherwise (included if ALIAS or NULL).

translate

public java.lang.String translate(StringConstant strConst)
                           throws TranslationException

Specified by:

translate in interface ADQLTranslator

Overrides:

translate in class JDBCTranslator

Throws:

TranslationException

translate

public java.lang.String translate(MathFunction fct)
                           throws TranslationException

Specified by:

translate in interface ADQLTranslator

Overrides:

translate in class JDBCTranslator

Throws:

TranslationException

translate

public java.lang.String translate(ExtractCoord extractCoord)
                           throws TranslationException

Throws:

TranslationException

translate

public java.lang.String translate(ExtractCoordSys extractCoordSys)
                           throws TranslationException

Throws:

TranslationException

translate

public java.lang.String translate(AreaFunction areaFunction)
                           throws TranslationException

Throws:

TranslationException

translate

public java.lang.String translate(CentroidFunction centroidFunction)
                           throws TranslationException

Throws:

TranslationException

translate

public java.lang.String translate(DistanceFunction fct)
                           throws TranslationException

Throws:

TranslationException

translate

public java.lang.String translate(ContainsFunction fct)
                           throws TranslationException

Throws:

TranslationException

translate

public java.lang.String translate(IntersectsFunction fct)
                           throws TranslationException

Throws:

TranslationException

translate

public java.lang.String translate(BoxFunction box)
                           throws TranslationException

Throws:

TranslationException

translate

public java.lang.String translate(CircleFunction circle)
                           throws TranslationException

Throws:

TranslationException

translate

public java.lang.String translate(PointFunction point)
                           throws TranslationException

Throws:

TranslationException

translate

public java.lang.String translate(PolygonFunction polygon)
                           throws TranslationException

Throws:

TranslationException

translate

public java.lang.String translate(RegionFunction region)
                           throws TranslationException

Throws:

TranslationException

convertTypeFromDB

public DBType convertTypeFromDB(int dbmsType,
                                java.lang.String rawDbmsTypeName,
                                java.lang.String dbmsTypeName,
                                java.lang.String[] params)

Description copied from class: JDBCTranslator

Convert any type provided by a JDBC driver into a type understandable by the ADQL/TAP library.

Specified by:

convertTypeFromDB in class JDBCTranslator

Parameters:

dbmsType - Type returned by a JDBC driver. Note: this value is returned by ResultSetMetadata.getColumnType(int) and correspond to a type of java.sql.Types

rawDbmsTypeName - Full name of the type returned by a JDBC driver. Note: this name is returned by ResultSetMetadata.getColumnTypeName(int) ; this name may contain parameters

dbmsTypeName - Name of type, without the eventual parameters. Note: this name is extracted from rawDbmsTypeName.

params - The eventual type parameters (e.g. char string length). Note: these parameters are extracted from rawDbmsTypeName.

Returns:

The corresponding ADQL/TAP type or NULL if the specified type is unknown.

convertTypeToDB

public java.lang.String convertTypeToDB(DBType type)

Description copied from class: JDBCTranslator

Convert any type provided by the ADQL/TAP library into a type understandable by a JDBC driver.

Note: The returned DBMS type may contain some parameters between brackets.

Specified by:

convertTypeToDB in class JDBCTranslator

Parameters:

type - The ADQL/TAP library's type to convert.

Returns:

The corresponding DBMS type or NULL if the specified type is unknown.

translateGeometryFromDB

public STCS.Region translateGeometryFromDB(java.lang.Object jdbcColValue)
                                    throws ParseException

Description copied from class: JDBCTranslator

Parse the given JDBC column value as a geometry object and convert it into a STCS.Region.

Note: Generally the returned object will be used to get its STC-S expression.

Note: If the given column value is NULL, NULL will be returned.

Important note: This function is called ONLY for value of columns flagged as geometries by JDBCTranslator.convertTypeFromDB(int, String, String, String[]). So the value should always be of the expected type and format. However, if it turns out that the type is wrong and that the conversion is finally impossible, this function SHOULD throw a ParseException.

Specified by:

translateGeometryFromDB in class JDBCTranslator

Parameters:

jdbcColValue - A JDBC column value (returned by ResultSet.getObject(int)).

Returns:

The corresponding STCS.Region if the given value is a geometry.

Throws:

ParseException - If the given object is not a geometrical object or can not be transformed into a STCS.Region object.

translateGeometryToDB

public java.lang.Object translateGeometryToDB(STCS.Region region)
                                       throws ParseException

Description copied from class: JDBCTranslator

Convert the given STC region into a DB column value.

Note: This function is used only by the UPLOAD feature, to import geometries provided as STC-S expression in a VOTable document inside a DB column.

Note: If the given region is NULL, NULL will be returned.

Specified by:

translateGeometryToDB in class JDBCTranslator

Parameters:

region - The region to store in the DB.

Returns:

The corresponding DB column object.

Throws:

ParseException - If the given STC Region can not be converted into a DB object.