Module org.postgresql.pljava.internal

Package org.postgresql.pljava.sqlj

Class Loader

java.lang.Object

java.lang.ClassLoader

org.postgresql.pljava.sqlj.Loader

public class Loader
extends ClassLoader

Class loader to load from jars installed in the database with SQLJ.INSTALL_JAR.

Author:

Thomas Hallgren

Field Summary

Fields

Modifier and Type	Field	Description
static ClassLoader	SENTINEL	A distinguished singleton instance to serve as a type-safe "sentinel" reference in context classloader management (as Java considers null to be a meaningful setContextClassLoader argument).

Method Summary

Modifier and Type	Method	Description
static void	clearSchemaLoaders()	Removes all cached schema loaders, functions, and type maps.
protected Class<?>	findClass(String name)
protected URL	findResource(String name)
protected Enumeration<URL>	findResources(String name)
static ClassLoader	getCurrentLoader()	Obtains the loader that is in effect for the current schema (i.e.
static ClassLoader	getSchemaLoader(Lexicals.Identifier.Simple schema)	Obtain a loader that has been configured for the class path of the schema named schemaName.
static Map<Oid,Class<? extends SQLData>>	getTypeMap(Lexicals.Identifier.Simple schema)	Returns the SQL type Oid to Java Class map that contains the Java UDT mappings for the given schema.

Methods inherited from class java.lang.ClassLoader

clearAssertionStatus, defineClass, defineClass, defineClass, defineClass, definePackage, findClass, findLibrary, findLoadedClass, findResource, findSystemClass, getClassLoadingLock, getDefinedPackage, getDefinedPackages, getName, getPackage, getPackages, getParent, getPlatformClassLoader, getResource, getResourceAsStream, getResources, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, getUnnamedModule, isRegisteredAsParallelCapable, loadClass, loadClass, registerAsParallelCapable, resolveClass, resources, setClassAssertionStatus, setDefaultAssertionStatus, setPackageAssertionStatus, setSigners

Methods inherited from class java.lang.Object

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

Field Detail

SENTINEL

public static final ClassLoader SENTINEL

A distinguished singleton instance to serve as a type-safe "sentinel" reference in context classloader management (as Java considers null to be a meaningful setContextClassLoader argument).

Method Detail

clearSchemaLoaders

public static void clearSchemaLoaders()

Removes all cached schema loaders, functions, and type maps. This method is called by the utility functions that manipulate the data that has been cached. It is not intended to be called from user code.

getCurrentLoader

public static ClassLoader getCurrentLoader()
                                    throws SQLException

Obtains the loader that is in effect for the current schema (i.e. the schema that is first in the search path).

Returns:

A loader

Throws:

SQLException

getSchemaLoader

public static ClassLoader getSchemaLoader(Lexicals.Identifier.Simple schema)
                                   throws SQLException

Obtain a loader that has been configured for the class path of the schema named schemaName. Class paths are defined using the SQL procedure sqlj.set_classpath.

Parameters:

schema - The name of the schema as an Identifier.Simple.

Returns:

A loader.

Throws:

SQLException

getTypeMap

public static Map<Oid,Class<? extends SQLData>> getTypeMap(Lexicals.Identifier.Simple schema)
                                                          throws SQLException

Returns the SQL type Oid to Java Class map that contains the Java UDT mappings for the given schema. This method is called by the function mapping mechanisms. Application code should never call this method.

Parameters:

schema - The schema

Returns:

The Map, possibly empty but never null.

Throws:

SQLException

findClass

protected Class<?> findClass(String name)
                      throws ClassNotFoundException

Overrides:

findClass in class ClassLoader

Throws:

ClassNotFoundException

findResource

protected URL findResource(String name)

Overrides:

findResource in class ClassLoader

findResources

protected Enumeration<URL> findResources(String name)
                                  throws IOException

Overrides:

findResources in class ClassLoader

Throws:

IOException