Object
ReferenceResolver
Controls the (un)marshaller behavior regarding the
xlink
or uuidref
attributes.
At marshalling time, this class controls whether the marshaller is allowed to write a reference
to an existing instance instead of writing the full object definition.
At unmarshalling time, this class replaces (if possible) a reference by the full object definition.
Subclasses can override the methods defined in this class in order to search in their own catalog.
See the XML.RESOLVER
javadoc for an example of registering a custom ReferenceResolver
to a unmarshaller.
- Since:
- 0.3
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Field Summary
Modifier and TypeFieldDescriptionstatic final ReferenceResolver
The default and thread-safe instance. -
Constructor Summary
ModifierConstructorDescriptionprotected
Creates a defaultReferenceResolver
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Method Summary
Modifier and TypeMethodDescriptionanchor
(MarshalContext context, Object value, CharSequence text) Returns the<gcx:Anchor>
to use for the given text, ornull
if none.<T> boolean
canSubstituteByReference
(MarshalContext context, Class<T> type, T object, String id) Returnstrue
if the marshaller can use axlink:href="#id"
reference to the given object instead of writing the full XML element.<T> boolean
canSubstituteByReference
(MarshalContext context, Class<T> type, T object, UUID uuid) Returnstrue
if the marshaller can use a reference to the given object instead of writing the full XML element.<T> boolean
canSubstituteByReference
(MarshalContext context, Class<T> type, T object, XLink link) Returnstrue
if the marshaller can use axlink:href
reference to the given object instead of writing the full XML element.<T> T
newIdentifiedObject
(MarshalContext context, Class<T> type, Identifier... identifiers) Returns an empty object of the given type having the given identifiers.<T> T
resolve
(MarshalContext context, Class<T> type, UUID uuid) Returns an object of the given type for the givenuuid
attribute, ornull
if none.<T> T
resolve
(MarshalContext context, Class<T> type, XLink link) Returns an object of the given type for the givenxlink
attribute, ornull
if none.
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Field Details
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DEFAULT
The default and thread-safe instance. This instance is used at unmarshalling time when noReferenceResolver
was explicitly set by theXML.RESOLVER
property.
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Constructor Details
-
ReferenceResolver
protected ReferenceResolver()Creates a defaultReferenceResolver
. This constructor is for subclasses only.
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Method Details
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newIdentifiedObject
Returns an empty object of the given type having the given identifiers. The object returned by the default implementation has the following properties:- Implements the given
type
interface. - Implements the
NilObject
andIdentifiedObject
interfaces from this package. IdentifiedObject.getIdentifiers()
will return the given identifiers.IdentifiedObject.getIdentifierMap()
will return aMap
view over the given identifiers.- All other methods except the ones inherited from the
Object
class will return an empty collection, an empty array,null
,Double.NaN
, 0 orfalse
, depending on the method return type.
- Type Parameters:
T
- the compile-time type of thetype
argument.- Parameters:
context
- context (GML version, locale, etc.) of the (un)marshalling process.type
- the type of object to be unmarshalled, often as a GeoAPI interface.identifiers
- an arbitrary number of identifiers. For each identifier, the authority is typically (but not necessarily) one of the constants defined inIdentifierSpace
.- Returns:
- an object of the given type for the given identifiers, or
null
if none.
- Implements the given
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resolve
Returns an object of the given type for the givenuuid
attribute, ornull
if none. The default implementation returnsnull
in all cases.- Type Parameters:
T
- the compile-time type of thetype
argument.- Parameters:
context
- context (GML version, locale, etc.) of the (un)marshalling process.type
- the type of object to be unmarshalled, often as a GeoAPI interface.uuid
- theuuid
attributes.- Returns:
- an object of the given type for the given
uuid
attribute, ornull
if none.
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resolve
Returns an object of the given type for the givenxlink
attribute, ornull
if none. The default implementation performs the following lookups:- If the
xlink:href
attribute is a URI fragment of the form"#foo"
and if an object of classtype
with thegml:id="foo"
attribute has previously been seen in the same XML document, then that object is returned. - Otherwise returns
null
.
- Type Parameters:
T
- the compile-time type of thetype
argument.- Parameters:
context
- context (GML version, locale, etc.) of the (un)marshalling process.type
- the type of object to be unmarshalled, often as a GeoAPI interface.link
- thexlink
attributes.- Returns:
- an object of the given type for the given
xlink
attribute, ornull
if none.
- If the
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canSubstituteByReference
public <T> boolean canSubstituteByReference(MarshalContext context, Class<T> type, T object, String id) Returnstrue
if the marshaller can use axlink:href="#id"
reference to the given object instead of writing the full XML element. This method is invoked by the marshaller when:- The given object has already been marshalled in the same XML document.
- The marshalled object had a
gml:id
attribute- either specified explicitly by
IdentifierMap.put(IdentifierSpace.ID, id)
- or inferred automatically by the marshalled object
(e.g.
AbstractIdentifiedObject
).
- either specified explicitly by
true
, then the use ofxlink:href="#id"
will have precedence over UUID and XLink alternatives.The default implementation unconditionally returns
true
. Subclasses can override this method if they want to filter which objects to declare by reference.- Type Parameters:
T
- the compile-time type of thetype
argument.- Parameters:
context
- context (GML version, locale, etc.) of the (un)marshalling process.type
- the type of object to be unmarshalled, often as a GeoAPI interface.object
- the object to be marshalled.id
- thegml:id
value of the object to be marshalled.- Returns:
true
if the marshaller can use thexlink:href="#id"
attribute instead of marshalling the given object.- Since:
- 0.7
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canSubstituteByReference
public <T> boolean canSubstituteByReference(MarshalContext context, Class<T> type, T object, UUID uuid) Returnstrue
if the marshaller can use a reference to the given object instead of writing the full XML element. This method is invoked when an object to be marshalled has a UUID identifier. Because those object may be defined externally, SIS cannot know if the object shall be fully marshalled or not. Such information needs to be provided by the application.The default implementation returns
true
in the following cases:- If
object
implementsNilObject
. - If
object
implementsEmptiable
and itsisEmpty()
method returnstrue
.
- Type Parameters:
T
- the compile-time type of thetype
argument.- Parameters:
context
- context (GML version, locale, etc.) of the (un)marshalling process.type
- the type of object to be unmarshalled, often as a GeoAPI interface.object
- the object to be marshalled.uuid
- the unique identifier of the object to be marshalled.- Returns:
true
if the marshaller can use theuuidref
attribute instead of marshalling the given object.
- If
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canSubstituteByReference
public <T> boolean canSubstituteByReference(MarshalContext context, Class<T> type, T object, XLink link) Returnstrue
if the marshaller can use axlink:href
reference to the given object instead of writing the full XML element. This method is invoked when an object to be marshalled has aXLink
identifier. Because those object may be defined externally, SIS cannot know if the object shall be fully marshalled or not. Such information needs to be provided by the application.The default implementation returns
true
in the following cases:- If
object
implementsNilObject
. - If
object
implementsEmptiable
and itsisEmpty()
method returnstrue
.
- Type Parameters:
T
- the compile-time type of thetype
argument.- Parameters:
context
- context (GML version, locale, etc.) of the (un)marshalling process.type
- the type of object to be unmarshalled, often as a GeoAPI interface.object
- the object to be marshalled.link
- the reference of the object to be marshalled.- Returns:
true
if the marshaller can use thexlink:href
attribute instead of marshalling the given object.
- If
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anchor
Returns the<gcx:Anchor>
to use for the given text, ornull
if none. Anchors can appear in ISO 19115-3 documents where we would normally expect a character sequence. For example:XML representations of string As <gco:CharacterString>
As <gcx:Anchor>
<cit:country> <gco:CharacterString>France</gco:CharacterString> </cit:country>
<cit:country> <gcx:Anchor xlink:href="SDN:C320:2:FR">France</gcx:Anchor> </cit:country>
- Parameters:
context
- context (GML version, locale, etc.) of the (un)marshalling process.value
- the value for which an anchor is requested. Often the same instance thantext
, but can also be theURI
orLocale
instance for whichtext
is a string representation.text
- the textual representation of the value for which to get the anchor.- Returns:
- the anchor for the given text, or
null
if none.
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