org.universAAL.middleware.rdf

Class UnmodifiableResource

java.lang.Object

org.universAAL.middleware.rdf.Resource

org.universAAL.middleware.rdf.UnmodifiableResource

public final class UnmodifiableResource
extends Resource

A Resource that can not be modified.

Author:

Carsten Stockloew

Field Summary

Fields inherited from class org.universAAL.middleware.rdf.Resource

ANON_URI_PREFIX, blockAddingTypes, isXMLLiteral, NAMESPACE_PREFIX, ns_delim_index, PROP_INVOLVED_HUMAN_USER, PROP_RDF_FIRST, PROP_RDF_REST, PROP_RDF_TYPE, PROP_RDFS_COMMENT, PROP_RDFS_LABEL, PROP_SERIALIZATION_FULL, PROP_SERIALIZATION_OPTIONAL, PROP_SERIALIZATION_REDUCED, PROP_SERIALIZATION_UNDEFINED, props, RDF_EMPTY_LIST, RDF_NAMESPACE, RDFS_NAMESPACE, SERVICE_NAMESPACE, TYPE_RDF_LIST, TYPE_RDFS_CLASS, uri, VOCABULARY_NAMESPACE

Constructor Summary

Constructors

Constructor and Description
UnmodifiableResource(Resource r)

Method Summary

Modifier and Type	Method and Description
boolean	addType(String typeURI, boolean blockFurtherTypes) Set or add the type of this Resource.
List	asList() If this Resource represents an RDF List, retrieve the elements as List.
void	asList(List l) If this Resource represents an RDF List, retrieve the elements as List.
boolean	changeProperty(String propURI, Object value) Change the value (RDF object) of the specified property (RDF predicate) to the given object.
Resource	copy(boolean isXMLLitera) Create a copy of this resource.
Resource	deepCopy() Create a deep copy of this Resource, i.e.
boolean	equals(Object other) Determines if this Resource equals the specified Resource.
Class	getClassOfUnmodifiable()
String	getLocalName() Get the local name which is the part of the URI after the delimiter ('#').
String	getNamespace() Get the namespace of the URI which is the start of the URI including the delimiter ('#').
String	getOrConstructLabel(String type) If this resource has no original label, constructs one for it without changing the resource itself.
Object	getProperty(String propURI) Get the RDF object for a specified property.
Enumeration	getPropertyURIs() Get all properties, i.e.
int	getPropSerializationType(String propURI) Answers if the given property has to be considered when serializing this individual in a minimized way, and if not ignore-able, whether its value should be presented in its full form or can be reduced.
String	getResourceComment() Get the Resource comment.
String	getResourceLabel() Get the Resource label.
Object	getStaticFieldValue(String fieldName, Object defaultValue) Helper method to get the static field of the java class with the given field name.
String	getType() Returns the URI of the first type added to the list of types of this resource.
String[]	getTypes() Returns the URIs of all known types of this resource.
static Object	getUnmodifiable(Object o) Get an unmodifiable version of the given object.
String	getURI() Get the URI.
int	hashCode() Get the hash code for this Resource, calculated from the URI.
boolean	hasProperty(String propURI) Determines if this Resource has the specified property.
boolean	hasQualifiedName() Determines if this Resource has a qualified, i.e.
boolean	instanceOf(Class c)
boolean	isAnon() Determines if this Resource has an anonymous URI.
boolean	isClosedCollection(String propURI) Returns true if the value of the given property should be treated as an rdf:List.
boolean	isWellFormed() Returns true, if the state of the resource is valid, otherwise false.
int	numberOfProperties() Returns the number of properties, i.e.
boolean	representsQualifiedURI()
boolean	serializesAsXMLLiteral() Resources to be serialized and parsed as rdf:XMLLiteral must overwrite this method and return true.
boolean	setProperty(String propURI, Object value) Adds a statement with this resource as the subject, the given propURI as the predicate and the given value as the object.
boolean	setPropertyPath(String[] propPath, Object value) Set the given value at the end of the given property path, but does not force the setting.
boolean	setPropertyPath(String[] propPath, Object value, boolean force) Set the given value at the end of the given property path.
boolean	setPropertyPathFromOffset(String[] propPath, int fromIndex, Object value, boolean force) Change or add the Resource at the end of the given property path to the given value.
void	setResourceComment(String comment) Set the Resource comment.
void	setResourceLabel(String label) Set the Resource label.
String	toString() Get a String representation of this Resource; returns the URI.
String	toStringRecursive() Debug method: get a string of this RDF graph.
String	toStringRecursive(String prefix, boolean prefixAtStart, Hashtable visitedElements) Debug method: get a string of this RDF graph.

Methods inherited from class org.universAAL.middleware.rdf.Resource

addMultiLangProp, asRDFList, generateAnonURI, getDefaultLang, getFilename, getMultiLangProp, getOrConstructLabel, getResource, getResourceLabel, isAnon, isBlockingAddingTypes, isQualifiedName, literal, unliteral

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

UnmodifiableResource

public UnmodifiableResource(Resource r)

Method Detail

getUnmodifiable

public static Object getUnmodifiable(Object o)

Get an unmodifiable version of the given object. If the parameter is a Resource, an UnmodifiableResource is returned. If the parameter is a List, an UnmodifiableResourceList is returned.

Parameters:

o - The object for which an unmodifiable version should be returned.

Returns:

The unmodifiable version.

changeProperty

public boolean changeProperty(String propURI,
                              Object value)

Description copied from class: Resource

Change the value (RDF object) of the specified property (RDF predicate) to the given object. If the value can't be set, it is ensured that the original value is restored.

Overrides:

changeProperty in class Resource

Parameters:

propURI - The value has to be changed for this property.

value - The new value.

Returns:

true, if the value could be set.

getProperty

public Object getProperty(String propURI)

Description copied from class: Resource

Get the RDF object for a specified property.

Overrides:

getProperty in class Resource

Parameters:

propURI - URI of the property.

Returns:

The object for the given property.

setProperty

public boolean setProperty(String propURI,
                           Object value)

Description copied from class: Resource

Adds a statement with this resource as the subject, the given propURI as the predicate and the given value as the object. Subclasses must override this in order to decide if the statement to be added fits the general class constraints. If not, the call of this method should be ignored. For each property only one single call may be made to this method, unless subsequent calls to this method for setting the value of the same property are treated as an update for an update-able property. Multi-valued properties must be set using an instance of List. The differentiation, if a such list should be treated as an rdf:List, can be made with the help of Resource.isClosedCollection(String). The default implementation here accepts all property-value pairs blindly except for rdf:type which is handled if the value is a type URI, a Resource or a java.util.List of them.

Note: The setting of the property rdf:type is being handled by this class via the final methods Resource.addType(String, boolean), Resource.getType(), and Resource.getTypes(). Although these methods give the view of handling type URIs as strings, but in reality the types are stored as direct instances of this class. So, the subclasses should ignore calls for setting rdf:type; if not, then the subclass must pay attention that the value should be a List of direct instances of this class so that (1) the Resource.toString() method returns just the URI and (2) the serializers get no problems with the value. Also, settings via subclasses may be overwritten by this class if a subsequent call to Resource.addType(String, boolean) is made.

Overrides:

setProperty in class Resource

Returns:

true if the property changed as a result of the call

setPropertyPath

public boolean setPropertyPath(String[] propPath,
                               Object value,
                               boolean force)

Description copied from class: Resource

Set the given value at the end of the given property path.

Overrides:

setPropertyPath in class Resource

See Also:

Resource.setPropertyPathFromOffset(String[], int, Object, boolean)

setPropertyPath

public boolean setPropertyPath(String[] propPath,
                               Object value)

Description copied from class: Resource

Set the given value at the end of the given property path, but does not force the setting.

Overrides:

setPropertyPath in class Resource

See Also:

Resource.setPropertyPathFromOffset(String[], int, Object, boolean)

setPropertyPathFromOffset

public boolean setPropertyPathFromOffset(String[] propPath,
                                         int fromIndex,
                                         Object value,
                                         boolean force)

Description copied from class: Resource

Change or add the Resource at the end of the given property path to the given value. This method starts from this Resource and follows the given property path through the RDF graph. If a property from the path does not yet exist, a new anonymous Resource is automatically created. At the end of the property path, the given value is set as RDF object with the last property from the path as RDF predicate.

Overrides:

setPropertyPathFromOffset in class Resource

Parameters:

propPath - The set of properties defining the path through the RDF graph.

fromIndex - The property path is evaluated from this index on; if 'fromIndex' is greater than zero, then some entries at the beginning are just ignored.

value - The value to set at the end of the property path

force - Determines if setting the value has to be forced. If true, Resource.changeProperty(String, Object) is called, otherwise Resource.setProperty(String, Object) is called.

Returns:

true, if the operation was successful.

asList

public List asList()

Description copied from class: Resource

If this Resource represents an RDF List, retrieve the elements as List.

Overrides:

asList in class Resource

Returns:

The list containing the elements of this RDF list.

asList

public void asList(List l)

Description copied from class: Resource

If this Resource represents an RDF List, retrieve the elements as List.

Overrides:

asList in class Resource

Parameters:

l - The list to store the elements of this RDF list.

copy

public Resource copy(boolean isXMLLitera)

Description copied from class: Resource

Create a copy of this resource. This method only creates a copy of this resource and the property references, but not of the property values. If all resources of the RDF graph should be copied, use Resource.deepCopy().

Overrides:

copy in class Resource

Returns:

the copied resource as a non-specialized instance of Resource, not a subclass of it (Note: future versions may change this and return a specialized copy).

See Also:

#copyAsNonXMLLiteral()

deepCopy

public Resource deepCopy()

Description copied from class: Resource

Create a deep copy of this Resource, i.e. create a new Resource for this object and for the resources of all properties. The copied resources are specialized according to the type information stored in the rdf:type property.

Overrides:

deepCopy in class Resource

Returns:

The copied Resource.

equals

public boolean equals(Object other)

Description copied from class: Resource

Determines if this Resource equals the specified Resource.

Overrides:

equals in class Resource

getOrConstructLabel

public String getOrConstructLabel(String type)

Description copied from class: Resource

If this resource has no original label, constructs one for it without changing the resource itself.

Overrides:

getOrConstructLabel in class Resource

Parameters:

type - The optional type to be used instead of the return value of 'getType()' when constructing a label

Returns:

if there is an original label, that one is returned; otherwise a label constructed on-the-fly will be returned

getPropSerializationType

public int getPropSerializationType(String propURI)

Description copied from class: Resource

Answers if the given property has to be considered when serializing this individual in a minimized way, and if not ignore-able, whether its value should be presented in its full form or can be reduced. The return value must be one of Resource.PROP_SERIALIZATION_OPTIONAL, Resource.PROP_SERIALIZATION_REDUCED, or Resource.PROP_SERIALIZATION_FULL. It can be assumed that the given property is one of those returned by Resource.getPropertyURIs().
Decision criterion should be if the value of this property is absolutely necessary when this resource is being sent to a remote node. If the subclass rates it as unlikely that the receiver side would need this info, the answer should be PROP_SERIALIZATION_OPTIONAL in favor of lower communication traffic and higher performance even at risk of a possible additional query on the receiver side for fetching this info. With the same rationale, if a property should be included in the process of serialization, it is preferable to include it in a reduced form; in this case the return value should be PROP_SERIALIZATION_REDUCED, otherwise PROP_SERIALIZATION_FULL can be returned. Subclasses should normally overwrite this method as this default implementation returns always PROP_SERIALIZATION_FULL.

Overrides:

getPropSerializationType in class Resource

getResourceComment

public String getResourceComment()

Description copied from class: Resource

Get the Resource comment. Convenient method to retrieve rdfs:comment.

Overrides:

getResourceComment in class Resource

Returns:

the comment of this resource.

getResourceLabel

public String getResourceLabel()

Description copied from class: Resource

Get the Resource label. Convenient method to retrieve rdfs:label.

Overrides:

getResourceLabel in class Resource

Returns:

the label of this resource.

getStaticFieldValue

public Object getStaticFieldValue(String fieldName,
                                  Object defaultValue)

Description copied from class: Resource

Helper method to get the static field of the java class with the given field name. If the field is not defined in this class, the given default value is returned.

Overrides:

getStaticFieldValue in class Resource

Parameters:

fieldName - Name of the static field of the java class to retrieve.

defaultValue - Default value, if the field could not be retrieved.

Returns:

The value of the field.

hashCode

public int hashCode()

Description copied from class: Resource

Get the hash code for this Resource, calculated from the URI.

Overrides:

hashCode in class Resource

hasProperty

public boolean hasProperty(String propURI)

Description copied from class: Resource

Determines if this Resource has the specified property.

Overrides:

hasProperty in class Resource

isClosedCollection

public boolean isClosedCollection(String propURI)

Description copied from class: Resource

Returns true if the value of the given property should be treated as an rdf:List. Serializers can use this to determine if a multi-valued property should be serialized using the concept of rdf:List or the property should appear as often as the number of values assigned to the property. The default behavior is that a property associated with an instance of List is assumed to be a closed collection (unless it is specifically an instance of OpenCollection). Subclasses can change this, if needed.

Overrides:

isClosedCollection in class Resource

isWellFormed

public boolean isWellFormed()

Description copied from class: Resource

Returns true, if the state of the resource is valid, otherwise false.

Subclasses should overwrite this methods as the default implementation returns always true.

Overrides:

isWellFormed in class Resource

representsQualifiedURI

public boolean representsQualifiedURI()

Overrides:

representsQualifiedURI in class Resource

serializesAsXMLLiteral

public boolean serializesAsXMLLiteral()

Description copied from class: Resource

Resources to be serialized and parsed as rdf:XMLLiteral must overwrite this method and return true. Serializers and parsers can use this as a hint.

Overrides:

serializesAsXMLLiteral in class Resource

setResourceComment

public void setResourceComment(String comment)

Description copied from class: Resource

Set the Resource comment. Convenient method to set rdfs:comment.

Overrides:

setResourceComment in class Resource

Parameters:

comment - the comment.

setResourceLabel

public void setResourceLabel(String label)

Description copied from class: Resource

Set the Resource label. Convenient method to set rdfs:label.

Overrides:

setResourceLabel in class Resource

Parameters:

label - the label.

toString

public String toString()

Description copied from class: Resource

Get a String representation of this Resource; returns the URI.

Overrides:

toString in class Resource

toStringRecursive

public String toStringRecursive()

Description copied from class: Resource

Debug method: get a string of this RDF graph.

Overrides:

toStringRecursive in class Resource

Returns:

The graph as string.

toStringRecursive

public String toStringRecursive(String prefix,
                                boolean prefixAtStart,
                                Hashtable visitedElements)

Description copied from class: Resource

Debug method: get a string of this RDF graph.

Overrides:

toStringRecursive in class Resource

Parameters:

prefix - Indention string that every line starts with.

prefixAtStart - True iff the first line should start with the prefix string.

Returns:

The graph as string.

numberOfProperties

public int numberOfProperties()

Description copied from class: Resource

Returns the number of properties, i.e. the number of RDF predicates for this Resource.

Overrides:

numberOfProperties in class Resource

isAnon

public boolean isAnon()

Description copied from class: Resource

Determines if this Resource has an anonymous URI.

Overrides:

isAnon in class Resource

hasQualifiedName

public boolean hasQualifiedName()

Description copied from class: Resource

Determines if this Resource has a qualified, i.e. the URI has a delimiter ('#').

Overrides:

hasQualifiedName in class Resource

getURI

public String getURI()

Description copied from class: Resource

Get the URI.

Overrides:

getURI in class Resource

getPropertyURIs

public Enumeration getPropertyURIs()

Description copied from class: Resource

Get all properties, i.e. all RDF predicates for this Resource.

Overrides:

getPropertyURIs in class Resource

addType

public boolean addType(String typeURI,
                       boolean blockFurtherTypes)

Description copied from class: Resource

Set or add the type of this Resource. The type complies to rdf:type. A Resource can have multiple types.

Overrides:

addType in class Resource

Parameters:

typeURI - URI of the type.

blockFurtherTypes - If true, no further types can be added.

getLocalName

public String getLocalName()

Description copied from class: Resource

Get the local name which is the part of the URI after the delimiter ('#').

Overrides:

getLocalName in class Resource

Returns:

The local name of the URI of this resource.

See Also:

Resource.getNamespace(), Resource.getFilename()

getNamespace

public String getNamespace()

Description copied from class: Resource

Get the namespace of the URI which is the start of the URI including the delimiter ('#'). It is the URI without the local name.

Overrides:

getNamespace in class Resource

Returns:

The namespace of the URI of this resource.

See Also:

Resource.getLocalName(), Resource.getFilename()

getType

public String getType()

Description copied from class: Resource

Returns the URI of the first type added to the list of types of this resource.

Overrides:

getType in class Resource

getTypes

public String[] getTypes()

Description copied from class: Resource

Returns the URIs of all known types of this resource.

Overrides:

getTypes in class Resource

getClassOfUnmodifiable

public Class getClassOfUnmodifiable()

instanceOf

public boolean instanceOf(Class c)