Provides services for managing ontology documents, including loading imported
documents, and locally caching documents from resolvable URL's to improve
load performance. This class now delegates some of the responsibility for
resolving URI's and caching models to FileManager
.
By default, OntDocumentManager will use a copy of the
singleton global FileManager. Alternatively, a specific FileManager
can be given to a document manager instance to use when resolving URI's and file paths.
Note that the default behaviour is to hold a copy of the global file
manager. In order to ensure that the document manager directly uses the global
file manager (e.g. so that document manager sees updates to the location mappings
held by the file manager), use the setFileManager(FileManager)
method. For
example:
OntDocumentManager dm = OntDocumentManager.getInstance(); dm.setFileManager( FileManager.get() );
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Nested Class Summary
Nested ClassesModifier and TypeClassDescriptionstatic class
The default implementation ofOntDocumentManager.ReadHook
makes no changes.static interface
Interface defining a handler call-back in the case that theOntDocumentManager
fails in an attempt to read the contents of a URL into a model.static interface
Interface denoting a handler class that can intervene in the process of reading a source document into a model. -
Field Summary
FieldsModifier and TypeFieldDescriptionstatic final Property
Represents the alternative local copy of the public ontology; assumed to be resolvable, hence URL not URIstatic final String
The anchor char is added to the end of namespace prefix expansionsstatic final Property
Defines boolean policy choice of caching loaded modelsstatic final String
The default path for searching for the metadata on locally cached ontologiesstatic final Resource
rdf:type for document manager policy nodesstatic final Property
Specifies the URI of an ontology that we do not want to import, even if processImports is true.static final Property
Represents the ontology language used to encode the ontologystatic final String
Namespace for ontology metadata resources and propertiesstatic final Resource
rdf:type for ontology specification nodes in meta-data filestatic final Property
Represents the standard prefix for this namespacestatic final Property
Defines boolean policy choice of loading the imports closurestatic final Property
Represents the public URI of an ontology; also used to derive the namespacestatic final Property
The policy property for including the pre-declared namespace prefixes in a model. -
Constructor Summary
ConstructorsConstructorDescriptionInitialise a document manager by searching the default path for ontology metadata about known ontologies cached locally.OntDocumentManager
(String path) Initialise a document manager by searching the given path for ontology metadata about known ontologies cached locally.OntDocumentManager
(Model config) Initialise a document manager with the given configuration model.OntDocumentManager
(FileManager fileMgr, String path) Initialise a document manager by with the given FileManager, and then searching the given path for ontology metadata about known ontologies cached locally.OntDocumentManager
(FileManager fileMgr, Model config) Initialise a document manager with the given configuration model. -
Method Summary
Modifier and TypeMethodDescriptionvoid
addAltEntry
(String docURI, String locationURL) Add an entry for an alternative copy of the document with the given document URI.void
addIgnoreImport
(String uri) Add the given URI to the set of URI's we ignore in imports statementsvoid
Add an entry thatmodel
is the appropriate model to use for the given ontology document.void
Add an entry thatmodel
is the appropriate model to use for the given ontology documentvoid
Remove all entries from the model cachevoid
Configure this document manager using the given configuration information, after first resetting the model back to all default values.void
Configure this document manager according to the configuration options supplied by the given configuration model.doAltURLMapping
(String uri) Answer the URL of the alternative copy of the ontology document with the given URI, if known, or the URI unchanged if no alternative is known.void
Remove all managed entries for the given document.boolean
Answer true if the models loaded by this document manager from a given URI will be cached, so that they can be re-used in other compound ontology models.Answer the file manager instance being used by this document manager.static OntDocumentManager
OntDocumentManager is not a singleton, but a global default instance is available for applications where a single shared document manager is sufficient.Answer the URL of the most recently loaded policy URL, or null if no document manager policy has yet been loaded since the metadata search path was last set.Answer the path used to search for the ontology metadata to load.Answer the cached model corresponding to the given document, if known.getOntology
(String uri, OntModelSpec spec) Answer the ontology model that results from loading the document with the given URI.boolean
Answer the policy flag indicating whether the imports statements of loaded ontologies will be processed to build a union of s.Answer the handler object that handles failed document read attempts, or null if not defined.Answer the current ReadHook for this document manager instanceboolean
ignoringImport
(String uri) Answer true if the given URI is one that will be ignored during importsAnswer an iterator over the ontology document URI's that this document manager knows to re-direct to other URL's.Answer an iterator over the set of URI's we're ignoringvoid
loadImport
(OntModel model, String uri) Add the given model from the given URI as an import to the given model.void
loadImports
(OntModel model) Inspect the statements in the graph expressed by the given model, and load into the model any imported documents.void
removeIgnoreImport
(String uri) Remove the given URI from the set of URI's we ignore in imports statementsvoid
reset()
Reset all state in this document manager back to the default values it would have had when the object was created.void
reset
(boolean reload) Reset all state in this document manager back to the default values it would have had when the object was created.void
setCacheModels
(boolean cacheModels) Set the policy flag that indicates whether loaded models are cached by URIvoid
Set the file manager used by this ODM instance to a copy of the global file manager (and, by extension, the global location mapper).void
setFileManager
(FileManager fileMgr) Set the file manager used by this ODM instance to a copy of the global file manager (and, by extension, the global location mapper).void
setMetadataSearchPath
(String path, boolean replace) Change the search path for loading ontology metadata to the given path.void
setProcessImports
(boolean processImports) Set the policy flag for processing imports of loaded ontologies.void
Set the handler for read failures, overwriting any existing value.Replace the existing ReadHook with the given value.void
unloadImport
(OntModel model, String uri) Remove from the given model the import denoted by the given URI.
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Field Details
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DEFAULT_METADATA_PATH
The default path for searching for the metadata on locally cached ontologies- See Also:
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NS
Namespace for ontology metadata resources and properties- See Also:
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ANCHOR
The anchor char is added to the end of namespace prefix expansions- See Also:
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ONTOLOGY_SPEC
rdf:type for ontology specification nodes in meta-data file -
PUBLIC_URI
Represents the public URI of an ontology; also used to derive the namespace -
ALT_URL
Represents the alternative local copy of the public ontology; assumed to be resolvable, hence URL not URI -
PREFIX
Represents the standard prefix for this namespace -
LANGUAGE
Represents the ontology language used to encode the ontology -
DOC_MGR_POLICY
rdf:type for document manager policy nodes -
CACHE_MODELS
Defines boolean policy choice of caching loaded models -
PROCESS_IMPORTS
Defines boolean policy choice of loading the imports closure -
IGNORE_IMPORT
Specifies the URI of an ontology that we do not want to import, even if processImports is true. -
USE_DECLARED_NS_PREFIXES
The policy property for including the pre-declared namespace prefixes in a model.
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Constructor Details
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OntDocumentManager
public OntDocumentManager()Initialise a document manager by searching the default path for ontology metadata about known ontologies cached locally.
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OntDocumentManager
Initialise a document manager by searching the given path for ontology metadata about known ontologies cached locally.
- Parameters:
path
- The search path to search for initial metadata, which will also replace the current search path for this document manager. Use null to prevent loading of any initial ontology metadata. The path is a series of URL's, separated by a semi-colon (;).
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OntDocumentManager
Initialise a document manager by with the given FileManager, and then searching the given path for ontology metadata about known ontologies cached locally.
- Parameters:
path
- The search path to search for initial metadata- See Also:
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OntDocumentManager
Initialise a document manager with the given configuration model. This model is used in place of any model that might be found by searching the meta-data search path. Uses the default file manager, i.e. a copy of the global file manager.
- Parameters:
config
- An RDF model containing configuration information for this document manager.
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OntDocumentManager
Initialise a document manager with the given configuration model. This model is used in place of any model that might be found by searching the meta-data search path.
- Parameters:
fileMgr
- A file manager to use when locating source files for ontologiesconfig
- An RDF model containing configuration information for this document manager.
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Method Details
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getInstance
OntDocumentManager is not a singleton, but a global default instance is available for applications where a single shared document manager is sufficient.
- Returns:
- The default, global instance of a document manager
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getFileManager
Answer the file manager instance being used by this document manager.
- Returns:
- This object's file manager
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setReadHook
Replace the existing ReadHook with the given value. The previous read hook is returned.- Parameters:
hook
- The new read hook- Returns:
- The old read hook
- Throws:
IllegalArgumentException
- if the new read hook is null
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getReadHook
Answer the current ReadHook for this document manager instance- Returns:
- The read hook
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setFileManager
public void setFileManager()Set the file manager used by this ODM instance to a copy of the global file manager (and, by extension, the global location mapper).
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setFileManager
Set the file manager used by this ODM instance to a copy of the global file manager (and, by extension, the global location mapper).
- Parameters:
fileMgr
- The new file manager
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getMetadataSearchPath
Answer the path used to search for the ontology metadata to load. The format is a ';' separated list of URI's. The first URI on the path that is readable is taken to be the location of the local ontology metadata.
- Returns:
- The ontology metadata search path, as a string.
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setMetadataSearchPath
Change the search path for loading ontology metadata to the given path. If
replace
is true, any existing mappings are removed before the new path is searched. Otherwise, existing data will only be replaced if it is clobbered by keys loaded from the metadata loaded from the new path.- Parameters:
path
- The new metadata search path (seegetMetadataSearchPath()
for format)replace
- If true, clear existing mappings first
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setReadFailureHandler
Set the handler for read failures, overwriting any existing value.- Parameters:
rfHandler
- The new handler for failed document read attempts.
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getReadFailureHandler
Answer the handler object that handles failed document read attempts, or null if not defined.- Returns:
- The current read failure handler, or null
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configure
Configure this document manager using the given configuration information, after first resetting the model back to all default values.
- Parameters:
config
- Document manager configuration as an RDF model- See Also:
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configure
Configure this document manager according to the configuration options supplied by the given configuration model. If
reset
is true, the document manager is first reset back to all default values.- Parameters:
config
- Document manager configuration as an RDF modelreset
- If true, reset the document manager to default values, before attempting to configure the document manager using the given model.- See Also:
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reset
public void reset(boolean reload) Reset all state in this document manager back to the default values it would have had when the object was created. Optionally reload the profile metadata from the search path. Note that the metadata search path is not changed by this reset.
- Parameters:
reload
- If true, reload the configuration file from the search path.
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reset
public void reset()Reset all state in this document manager back to the default values it would have had when the object was created. This does not reload the configuration information from the search path. Note also that the metadata search path is one of the values that is reset back to its default value.
- See Also:
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listDocuments
Answer an iterator over the ontology document URI's that this document manager knows to re-direct to other URL's. Note that being in this iteration does not mean that a document with the given name is in the set of cached models held by this document manager.
- Returns:
- An Iterator ranging over the public URI strings for the known document URI's.
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doAltURLMapping
Answer the URL of the alternative copy of the ontology document with the given URI, if known, or the URI unchanged if no alternative is known.
- Parameters:
uri
- The ontology document to lookup- Returns:
- The resolvable location of the alternative copy, if known, or
uri
otherwise
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getModel
Answer the cached model corresponding to the given document, if known.
- Parameters:
uri
- The ontology document to lookup- Returns:
- The model for the document, or null if the model is not known.
- See Also:
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addAltEntry
Add an entry for an alternative copy of the document with the given document URI.
- Parameters:
docURI
- The public URI of the ontology documentlocationURL
- A locally resolvable URL where an alternative copy of the ontology document can be found
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addModel
Add an entry that
model
is the appropriate model to use for the given ontology document. Will not replace any existing model that is cached for this URI (seeaddModel(String, Model, boolean)
for an alternative that can replace existing models).- Parameters:
docURI
- The public URI of the ontology documentmodel
- A model containing the triples from the document
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addModel
Add an entry that
model
is the appropriate model to use for the given ontology document- Parameters:
docURI
- The public URI of the ontology documentmodel
- A model containing the triples from the documentreplace
- If true, replace any existing entry with this one.
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forget
Remove all managed entries for the given document. Note does not side-effect the prefixes table: this will have to be done separately.
- Parameters:
docURI
- The public URI for an ontology document
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getOntology
Answer the ontology model that results from loading the document with the given URI. This may be a cached model, if this document manager's policy is to cache loaded models. If not, or if no model is cached, the document will be read into a suitable model. The model will contain the imports closure of the ontology, if that is the current policy of this document manager.
- Parameters:
uri
- Identifies the model to load.spec
- Specifies the structure of the ontology model to create- Returns:
- An ontology model containing the statements from the ontology document.
- See Also:
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getProcessImports
public boolean getProcessImports()Answer the policy flag indicating whether the imports statements of loaded ontologies will be processed to build a union of s.
- Returns:
- True if imported models will be included in a loaded model
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getCacheModels
public boolean getCacheModels()Answer true if the models loaded by this document manager from a given URI will be cached, so that they can be re-used in other compound ontology models.
- Returns:
- If true, a cache is maintained of loaded models from their URI's.
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setProcessImports
public void setProcessImports(boolean processImports) Set the policy flag for processing imports of loaded ontologies.
- Parameters:
processImports
- If true, load imported ontologies during load- See Also:
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setCacheModels
public void setCacheModels(boolean cacheModels) Set the policy flag that indicates whether loaded models are cached by URI
- Parameters:
cacheModels
- If true, models will be cached by URI- See Also:
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addIgnoreImport
Add the given URI to the set of URI's we ignore in imports statements
- Parameters:
uri
- A URI to ignore when importing
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removeIgnoreImport
Remove the given URI from the set of URI's we ignore in imports statements
- Parameters:
uri
- A URI to ignore no longer when importing
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listIgnoredImports
Answer an iterator over the set of URI's we're ignoring
- Returns:
- An iterator over ignored imports
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ignoringImport
Answer true if the given URI is one that will be ignored during imports
- Parameters:
uri
- A URI to test- Returns:
- True if uri will be ignored as an import
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clearCache
public void clearCache()Remove all entries from the model cache
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loadImports
Inspect the statements in the graph expressed by the given model, and load into the model any imported documents. Imports statements are recognised according to the model's language profile. An occurs check allows cycles of importing safely. This method will do nothing if the policy for this manager is not to process imports. If the cache policy for this doc manager allows, models will be cached by URI and re-used where possible.
- Parameters:
model
- An ontology model whose imports are to be loaded.
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loadImport
Add the given model from the given URI as an import to the given model. Any models imported by the given URI will also be imported.
- Parameters:
model
- A model to import intouri
- The URI of a document to import
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unloadImport
Remove from the given model the import denoted by the given URI.
- Parameters:
model
- A modeluri
- The URI of a document to no longer import
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getLoadedPolicyURL
Answer the URL of the most recently loaded policy URL, or null if no document manager policy has yet been loaded since the metadata search path was last set.
- Returns:
- The most recently loaded policy URL or null.
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