Class AbstractMetadataResolver

All Implemented Interfaces:
Component, DestructableComponent, IdentifiableComponent, IdentifiedComponent, InitializableComponent, Resolver<EntityDescriptor,​CriteriaSet>, MetadataResolver
Direct Known Subclasses:
AbstractBatchMetadataResolver, AbstractDynamicMetadataResolver

public abstract class AbstractMetadataResolver
extends AbstractIdentifiableInitializableComponent
implements MetadataResolver
An abstract, base, implementation of a metadata provider.
  • Field Details

    • log

      private final org.slf4j.Logger log
      Class logger.
    • unmarshallerFactory

      private UnmarshallerFactory unmarshallerFactory
      Unmarshaller factory used to get an unmarshaller for the metadata DOM.
    • requireValidMetadata

      private boolean requireValidMetadata
      Whether metadata is required to be valid.
    • mdFilter

      private MetadataFilter mdFilter
      Filter applied to all metadata.
    • logPrefix

      private String logPrefix
      Logging prefix.
    • failFastInitialization

      private boolean failFastInitialization
      Whether problems during initialization should cause the provider to fail or go on without metadata. The assumption being that in most cases a provider will recover at some point in the future. Default: true.
    • entityBackingStore

      private AbstractMetadataResolver.EntityBackingStore entityBackingStore
      Backing store for runtime EntityDescriptor data.
    • parser

      private ParserPool parser
      Pool of parsers used to process XML.
    • satisfyAnyPredicates

      private boolean satisfyAnyPredicates
      Flag which determines whether predicates used in filtering are connected by a logical 'OR' (true) or by logical 'AND' (false). Defaults to false.
    • criterionPredicateRegistry

      private CriterionPredicateRegistry<EntityDescriptor> criterionPredicateRegistry
      Registry used in resolving predicates from criteria.
    • useDefaultPredicateRegistry

      private boolean useDefaultPredicateRegistry
      Flag which determines whether the default predicate registry will be used if one is not supplied explicitly. Defaults to true.
  • Constructor Details

    • AbstractMetadataResolver

      public AbstractMetadataResolver()
      Constructor.
  • Method Details

    • isRequireValidMetadata

      public boolean isRequireValidMetadata()
      Gets whether the metadata returned by queries must be valid.

      At a minimum, metadata is valid only if the date expressed in the validUntil attribute of the element and all its ancestral elements has not passed. Specific implementations may add additional constraints.

      Specified by:
      isRequireValidMetadata in interface MetadataResolver
      Returns:
      whether the metadata returned by queries must be valid
    • setRequireValidMetadata

      public void setRequireValidMetadata​(boolean require)
      Sets whether the metadata returned by queries must be valid.
      Specified by:
      setRequireValidMetadata in interface MetadataResolver
      Parameters:
      require - whether the metadata returned by queries must be valid
    • getMetadataFilter

      @Nullable public MetadataFilter getMetadataFilter()
      Gets the metadata filter applied to the metadata.
      Specified by:
      getMetadataFilter in interface MetadataResolver
      Returns:
      the metadata filter applied to the metadata
    • setMetadataFilter

      public void setMetadataFilter​(@Nullable MetadataFilter newFilter)
      Sets the metadata filter applied to the metadata.
      Specified by:
      setMetadataFilter in interface MetadataResolver
      Parameters:
      newFilter - the metadata filter applied to the metadata
    • isFailFastInitialization

      public boolean isFailFastInitialization()
      Gets whether problems during initialization should cause the provider to fail or go on without metadata. The assumption being that in most cases a provider will recover at some point in the future.
      Returns:
      whether problems during initialization should cause the provider to fail
    • setFailFastInitialization

      public void setFailFastInitialization​(boolean failFast)
      Sets whether problems during initialization should cause the provider to fail or go on without metadata. The assumption being that in most cases a provider will recover at some point in the future.
      Parameters:
      failFast - whether problems during initialization should cause the provider to fail
    • getParserPool

      @Nonnull public ParserPool getParserPool()
      Gets the pool of parsers to use to parse XML.
      Returns:
      pool of parsers to use to parse XML
    • setParserPool

      public void setParserPool​(@Nonnull ParserPool pool)
      Sets the pool of parsers to use to parse XML.
      Parameters:
      pool - pool of parsers to use to parse XML
    • isSatisfyAnyPredicates

      public boolean isSatisfyAnyPredicates()
      Get the flag indicating whether resolved credentials may satisfy any predicates (i.e. connected by logical 'OR') or all predicates (connected by logical 'AND').

      Defaults to false.

      Returns:
      true if must satisfy all, false otherwise
    • setSatisfyAnyPredicates

      public void setSatisfyAnyPredicates​(boolean flag)
      Set the flag indicating whether resolved credentials may satisfy any predicates (i.e. connected by logical 'OR') or all predicates (connected by logical 'AND').

      Defaults to false.

      Parameters:
      flag - true if must satisfy all, false otherwise
    • getCriterionPredicateRegistry

      @NonnullAfterInit public CriterionPredicateRegistry<EntityDescriptor> getCriterionPredicateRegistry()
      Get the registry used in resolving predicates from criteria.
      Returns:
      the effective registry instance used
    • setCriterionPredicateRegistry

      public void setCriterionPredicateRegistry​(@Nullable CriterionPredicateRegistry<EntityDescriptor> registry)
      Set the registry used in resolving predicates from criteria.
      Parameters:
      registry - the registry instance to use
    • isUseDefaultPredicateRegistry

      public boolean isUseDefaultPredicateRegistry()
      Get the flag which determines whether the default predicate registry will be used if one is not supplied explicitly.

      Defaults to true.

      Returns:
      true if should use default registry, false otherwise
    • setUseDefaultPredicateRegistry

      public void setUseDefaultPredicateRegistry​(boolean flag)
      Set the flag which determines whether the default predicate registry will be used if one is not supplied explicitly.

      Defaults to true.

      Parameters:
      flag - true if should use default registry, false otherwise
    • resolveSingle

      @Nullable public EntityDescriptor resolveSingle​(CriteriaSet criteria) throws ResolverException
      Specified by:
      resolveSingle in interface Resolver<EntityDescriptor,​CriteriaSet>
      Throws:
      ResolverException
    • getUnmarshallerFactory

      protected UnmarshallerFactory getUnmarshallerFactory()
      Get the XMLObject unmarshaller factory to use.
      Returns:
      the unmarshaller factory instance to use
    • doInitialize

      protected final void doInitialize() throws ComponentInitializationException
      Overrides:
      doInitialize in class AbstractIdentifiedInitializableComponent
      Throws:
      ComponentInitializationException
    • doDestroy

      protected void doDestroy()
      Overrides:
      doDestroy in class AbstractInitializableComponent
    • initMetadataResolver

      protected void initMetadataResolver() throws ComponentInitializationException
      Subclasses should override this method to perform any initialization logic necessary. Default implementation is a no-op.
      Throws:
      ComponentInitializationException - thrown if there is a problem initializing the provider
    • unmarshallMetadata

      @Nonnull protected XMLObject unmarshallMetadata​(@Nonnull InputStream metadataInput) throws UnmarshallingException
      Unmarshalls the metadata from the given stream. The stream is closed by this method and the returned metadata released its DOM representation.
      Parameters:
      metadataInput - the input reader to the metadata.
      Returns:
      the unmarshalled metadata
      Throws:
      UnmarshallingException - thrown if the metadata can no be unmarshalled
    • filterMetadata

      @Nullable protected XMLObject filterMetadata​(@Nullable XMLObject metadata) throws FilterException
      Filters the given metadata.
      Parameters:
      metadata - the metadata to be filtered
      Returns:
      the filtered metadata
      Throws:
      FilterException - thrown if there is an error filtering the metadata
    • newFilterContext

      @Nonnull protected MetadataFilterContext newFilterContext()
      Get a new instance of MetadataFilterContext to be used when filtering metadata.

      This default implementation will just return an empty context. Subclasses would override to add contextual info specific to the implementation.

      Returns:
      the new filter context instance
    • releaseMetadataDOM

      protected void releaseMetadataDOM​(@Nullable XMLObject metadata)
      Releases the DOM representation from the metadata object.
      Parameters:
      metadata - the metadata object
    • isValid

      protected boolean isValid​(@Nullable XMLObject descriptor)
      Returns whether the given descriptor is valid. If valid metadata is not required this method always returns true.
      Parameters:
      descriptor - the descriptor to check
      Returns:
      true if valid metadata is not required or the given descriptor is valid, false otherwise
    • lookupEntityID

      @Nonnull @NonnullElements protected List<EntityDescriptor> lookupEntityID​(@Nonnull @NotEmpty String entityID) throws ResolverException
      Get list of descriptors matching an entityID.
      Parameters:
      entityID - entityID to lookup
      Returns:
      a list of descriptors
      Throws:
      ResolverException - if an error occurs
    • lookupIndexedEntityID

      @Nonnull @NonnullElements protected List<EntityDescriptor> lookupIndexedEntityID​(@Nonnull @NotEmpty String entityID)
      Lookup the specified entityID from the index. The returned list will be a copy of what is stored in the backing index, and is safe to be manipulated by callers.
      Parameters:
      entityID - the entityID to lookup
      Returns:
      list copy of indexed entityID's, may be empty, will never be null
    • createNewBackingStore

      @Nonnull protected AbstractMetadataResolver.EntityBackingStore createNewBackingStore()
      Create a new backing store instance for EntityDescriptor data. Subclasses may override to return a more specialized subclass type. Note this method does not make the returned backing store the effective one in use. The caller is responsible for calling setBackingStore(EntityBackingStore) to make it the effective instance in use.
      Returns:
      the new backing store instance
    • getBackingStore

      @Nonnull protected AbstractMetadataResolver.EntityBackingStore getBackingStore()
      Get the EntityDescriptor backing store currently in use by the metadata resolver.
      Returns:
      the current effective entity backing store
    • setBackingStore

      protected void setBackingStore​(@Nonnull AbstractMetadataResolver.EntityBackingStore newBackingStore)
      Set the EntityDescriptor backing store currently in use by the metadata resolver.
      Parameters:
      newBackingStore - the new entity backing store
    • preProcessEntityDescriptor

      protected void preProcessEntityDescriptor​(@Nonnull EntityDescriptor entityDescriptor, @Nonnull AbstractMetadataResolver.EntityBackingStore backingStore)
      Pre-process the specified entity descriptor, updating the specified entity backing store instance as necessary.
      Parameters:
      entityDescriptor - the target entity descriptor to process
      backingStore - the backing store instance to update
    • removeByEntityID

      protected void removeByEntityID​(@Nonnull String entityID, @Nonnull AbstractMetadataResolver.EntityBackingStore backingStore)
      Remove from the backing store all metadata for the entity with the given entity ID.
      Parameters:
      entityID - the entity ID of the metadata to remove
      backingStore - the backing store instance to update
    • indexEntityDescriptor

      protected void indexEntityDescriptor​(@Nonnull EntityDescriptor entityDescriptor, @Nonnull AbstractMetadataResolver.EntityBackingStore backingStore)
      Index the specified entity descriptor, updating the specified entity backing store instance as necessary.
      Parameters:
      entityDescriptor - the target entity descriptor to process
      backingStore - the backing store instance to update
    • preProcessEntitiesDescriptor

      protected void preProcessEntitiesDescriptor​(@Nonnull EntitiesDescriptor entitiesDescriptor, AbstractMetadataResolver.EntityBackingStore backingStore)
      Pre-process the specified entities descriptor, updating the specified entity backing store instance as necessary.
      Parameters:
      entitiesDescriptor - the target entities descriptor to process
      backingStore - the backing store instance to update
    • predicateFilterCandidates

      protected Iterable<EntityDescriptor> predicateFilterCandidates​(@Nonnull Iterable<EntityDescriptor> candidates, @Nonnull CriteriaSet criteria, boolean onEmptyPredicatesReturnEmpty) throws ResolverException
      Filter the supplied candidates by resolving predicates from the supplied criteria and applying the predicates to return a filtered Iterable.
      Parameters:
      candidates - the candidates to evaluate
      criteria - the criteria set to evaluate
      onEmptyPredicatesReturnEmpty - if true and no predicates are supplied, then return an empty iterable; otherwise return the original input candidates
      Returns:
      an iterable of the candidates filtered by the resolved predicates
      Throws:
      ResolverException - if there is a fatal error during resolution
    • getLogPrefix

      @Nonnull @NotEmpty protected String getLogPrefix()
      Return a prefix for logging messages for this component.
      Returns:
      a string for insertion at the beginning of any log messages