Package org.eclipse.persistence.sdo.helper

Class SDOHelperContext

java.lang.Object
org.eclipse.persistence.sdo.helper.SDOHelperContext
All Implemented Interfaces:
HelperContext
Direct Known Subclasses:
JAXBHelperContext
public class SDOHelperContext extends Object implements HelperContext
Purpose:
  • This class represents a local HelperContext. The global HelperContext can be accessed as HelperProvider.getDefaultContext().
Responsibilities:
  • Provide access to instances of helper objects.
  • Provide an OSGi compatible HelperContext (when the constructor that takes a ClassLoader is used).

  • Field Details

  • Constructor Details

    • SDOHelperContext

      public SDOHelperContext()
      Create a local HelperContext. The current thread's context ClassLoader will be used to find static instance classes. In OSGi environments the construct that takes a ClassLoader parameter should be used instead.

    • SDOHelperContext

      public SDOHelperContext(String identifier)
      Create a local HelperContext with the given identifier. The current thread's context ClassLoader will be used to find static instance classes. In OSGi environments the construct that takes a ClassLoader parameter should be used instead.
      Parameters:
      identifier - The unique label for this HelperContext.

    • SDOHelperContext

      public SDOHelperContext(ClassLoader aClassLoader)
      Create a local HelperContext. This constructor should be used in OSGi environments.
      Parameters:
      aClassLoader - This class loader will be used to find static instance classes.

    • SDOHelperContext

      public SDOHelperContext(String identifier, ClassLoader aClassLoader)
      Create a local HelperContext with the given identifier. This constructor should be used in OSGi environments.
      Parameters:
      identifier - The unique label for this HelperContext.
      aClassLoader - This class loader will be used to find static instance classes.

  • Method Details

    • setApplicationResolver

      public static void setApplicationResolver(ApplicationResolver aResolver)
      ADVANCED: Used to set an ApplicationResolver instance that will be used to retrieve info pertaining to a given application, such as the application name, in the case where our logic fails. This method can be called once and only once per active server instance.
      Parameters:
      aResolver - the ApplicationResolver instance that will be used to retrieve info pertaining to a given application. Note that null is considered a valid set operation.
      Throws:
      SDOException - if more than one call is made to this method in an active server instance.

    • isApplicationResolverSet

      public static boolean isApplicationResolverSet()
      Indicates if a call to setApplicationResolver has been made.
      Returns:
      true if a prior call to setApplicationResolver has been made, false otherwise

    • initialize

      protected void initialize(ClassLoader aClassLoader)
      The underlying helpers for this instance will be instantiated in this method.
      Parameters:
      aClassLoader -

    • reset

      public void reset()
      Reset the Type,XML and XSD helper instances.

    • getCopyHelper

      public CopyHelper getCopyHelper()
      Return the CopyHelper instance for this helper context.
      Specified by:
      getCopyHelper in interface HelperContext
      Returns:
      a CopyHelper object

    • getDataFactory

      public DataFactory getDataFactory()
      Return the DataFactory instance for this helper context.
      Specified by:
      getDataFactory in interface HelperContext
      Returns:
      a DataFactory object

    • getDataHelper

      public DataHelper getDataHelper()
      Return the DataHelper instance for this helper context.
      Specified by:
      getDataHelper in interface HelperContext
      Returns:
      a DataHelper object

    • getEqualityHelper

      public EqualityHelper getEqualityHelper()
      Return the EqualityHelper instance for this helper context.
      Specified by:
      getEqualityHelper in interface HelperContext
      Returns:
      an EqualityHelper object

    • getTypeHelper

      public TypeHelper getTypeHelper()
      Return the TypeHelper instance for this helper context.
      Specified by:
      getTypeHelper in interface HelperContext
      Returns:
      a TypeHelper object

    • getXMLHelper

      public XMLHelper getXMLHelper()
      Return the XMLHelper instance for this helper context.
      Specified by:
      getXMLHelper in interface HelperContext
      Returns:
      an XMLHelper object

    • getXSDHelper

      public XSDHelper getXSDHelper()
      Return the XSDHelper instance for this helper context.
      Specified by:
      getXSDHelper in interface HelperContext
      Returns:
      an XSDHelper object

    • createResolvable

      public ExternalizableDelegator.Resolvable createResolvable()
      Create and return a new ExternalizableDelegator.Resolvable instance based on this helper context.
      Returns:

    • createResolvable

      public ExternalizableDelegator.Resolvable createResolvable(Object target)
      Create and return a new ExternalizableDelegator.Resolvable instance based on this helper context and a given target.
      Parameters:
      target -
      Returns:

    • putHelperContext

      public static void putHelperContext(ClassLoader key, HelperContext value)
      INTERNAL: Put a ClassLoader/HelperContext key/value pair in the Thread HelperContext map. If Thread.currentThread().getContextClassLoader() == key during getHelperContext() call then the HelperContext (value) will be returned. This method will overwrite an existing entry in the map with the same ClassLoader key.
      Parameters:
      key - class loader
      value - helper context

    • removeHelperContext

      public static void removeHelperContext(ClassLoader key)
      INTERNAL: Remove a ClassLoader/HelperContext key/value pair from the Thread HelperContext map. If there are multiple local helper contexts associated with this ClassLoader, they will all be removed from the map.
      Parameters:
      key - class loader

    • removeHelperContext

      public static void removeHelperContext(String identifier, ClassLoader key)
      INTERNAL
      Parameters:
      identifier - the specific identifier of the HelperContext to be removed. "" for a Global helper
      key - the ClassLoader associated with the HelperContext to be removed

    • getHelperContext

      public static HelperContext getHelperContext()
      INTERNAL: Return the helper context for a given key. The key will either be a ClassLoader or a String (representing an application name). A new context will be created and put in the map if none exists for the given key. The key is assumed to be non-null - getDelegateKey should always return either a string representing the application name (for WLS, WAS and JBoss if available) or a class loader. This is relevant since 'putIfAbsent' will throw a null pointer exception if the key is null.

    • getHelperContext

      public static HelperContext getHelperContext(String identifier)
      Return the local helper context associated with the given identifier, or create one if it does not already exist. If identifier is an alias, the value associated with it in the alias Map will be used as the identifier value.
      Parameters:
      identifier - the identifier or alias to use for lookup/creation
      Returns:
      HelperContext associated with identifier, or a new HelperContext keyed on identifier if none eixsts

    • getHelperContext

      public static HelperContext getHelperContext(String identifier, ClassLoader classLoader)
      Return the local helper context with the given identifier, or create one if it does not already exist.

    • putHelperContext

      public static void putHelperContext(HelperContext ctx)
      Replaces the provided helper context in the map of identifiers to helper contexts for this application. ctx.getIdentifier() will be used to obtain the identifier value. If identifier is a key in the the alias Map, i.e. was previously set as alias, the corresponding entry will be removed from the alias Map.
      Parameters:
      ctx - the HelperContext to be added to the context Map for the current application

    • getHelperContextResolver

      public static SDOHelperContext.HelperContextResolver getHelperContextResolver()
      Getter for HelperContextResolver
      Returns:
      actual strategy

    • setHelperContextResolver

      public static void setHelperContextResolver(Object helperContextResolver)
      Method allows dynamically change HelperContext creation strategy.
      Parameters:
      helperContextResolver - on this object SDOHelperContext.HelperContextResolver.getHelperContext(String, ClassLoader) will be called. If it is null - then default strategy will be set.

    • setHelperContextResolver

      public static void setHelperContextResolver(SDOHelperContext.HelperContextResolver helperContextResolver)
      Method allows dynamically change HelperContext creation strategy.
      Parameters:
      helperContextResolver - strategy to be used. If it is null - then default strategy will be set.

    • removeHelerContextResolver

      public static void removeHelerContextResolver()
      Removes HelperContextResolver for the current application. Application is resolved based on applicationName or classLoader.

    • makeDefaultContext

      public void makeDefaultContext()
      ADVANCED Promote this helper context to be the default or global one. This will completely replace the existing default context including all types and properties defined.

    • getIdentifier

      public String getIdentifier()
      Return the unique label for this HelperContext.
      Returns:
      String representing the unique label for this HelperContext

    • hasHelperContext

      public static boolean hasHelperContext(String identifier)
      Return true if a HelperContext corresponding to this identifier or alias already exists, else false. If identifer is an alias, the corresponding value in the alias Map will be used as the identifier for the lookup.
      Parameters:
      identifier - the alias or identifier used to lookup a helper context
      Returns:
      true if an entry exists in the helper context map for identifier (or the associated identifier value if identifier is an alias), false otherwise.

    • addAlias

      public static void addAlias(String identifier, String alias)
      Add an alias to identifier pair to the alias Map for the current application.
      Parameters:
      identifier - assumed to be a key in the helper context Map
      alias - the alias to be associated with identifier

    • setProperty

      public void setProperty(String name, Object value)
      Add a name/value pair to the properties Map. If name is null, nothing will be done. If value is null, the entry in the Map will be removed (if an entry exists for name).
      Parameters:
      name - the name of the property
      value - the value of the property

    • getProperty

      public Object getProperty(String name)
      Return the value stored in the properties Map for a given name, or null if an entry for name does not exist.
      Parameters:
      name - the name of the property to be returned
      Returns:
      the value associated with name, or null

    • isStrictTypeCheckingEnabled

      public boolean isStrictTypeCheckingEnabled()
      Indicates whether strict type checking is enabled.

      If strict type checking is enabled then Type.getInstanceClass() interface is checked whether it contains getters for all the properties of the Type upon initialization of the Type. If any getter is missing then the interface is ignored and Type.getInstanceClass() will return null.

      The getters are not checked if the strict type checking is disabled.

      Returns:
      boolean value

    • setStrictTypeCheckingEnabled

      public void setStrictTypeCheckingEnabled(boolean enabled)
      Controls type checking strictness. See isStrictTypeCheckingEnabled() for more details.
      Parameters:
      enabled - new value (true to enable the strict validation)

    • getWrapperTypes

      public static Map<SDOTypeHelperDelegate.SDOWrapperTypeId,SDOWrapperType> getWrapperTypes()
      Returns the SDOWrapperType instances for current application

    • putWrapperTypes

      public static Map<SDOTypeHelperDelegate.SDOWrapperTypeId,SDOWrapperType> putWrapperTypes(Map<SDOTypeHelperDelegate.SDOWrapperTypeId,SDOWrapperType> wrapperTypes)
      Replaces the SDOWrapperType instances for current application with the ones passed as an argument
      Parameters:
      wrapperTypes - the SDOWrapperType instances to use for current application
      Returns:
      SDOWrapperType instances configured for current application