Class IRIx
- Direct Known Subclasses:
IRIProviderJenaIRI.IRIxJena
The class IRIx
is an abstraction layer; a provider is needed to give an
implementation. A provider is selected at start-up and is not expected to change
while the system is running.
Use IRIs.reference(java.lang.String)
to check a string is suitable for us in RDF.
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Method Summary
Modifier and TypeMethodDescriptionstatic IRIx
Create anIRIx
without resolving the iri.static IRIx
Create anIRIx
for any string.abstract boolean
abstract Object
getImpl()
Return the implementation object of the provider.abstract int
hashCode()
abstract boolean
Test whether the IRI has the given scheme name.abstract boolean
An absolute URI is one with a URI scheme and without a fragment.abstract boolean
An RDF Reference is an URI which has scheme.abstract boolean
A relative URI one without a scheme, and maybe without some of the other parts.abstract IRIx
Syntax-based Normalization Normalize anIRIx
.abstract IRIx
relativize
(IRIx other) Return (if possible), an IRI that is relative to the base argument.abstract IRIx
Try to resolve a string against this IRI as base.abstract IRIx
Try to resolve a string against this IRI as base.str()
Return the URI as string.toString()
User readable form.
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Method Details
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create
Create anIRIx
without resolving the iri. This operation may throw anIRIException
.See
IRIs.resolve(String)
to create an absolute IRI, resolving against the system base if necessary.See
IRIs.check(String)
to check a string is an absolute URI and is suitable for use in RDF.See
IRIs.reference(String)
when the string is an absolute URI and should not be resolved against local system base (e.g. it was passed in from outside) to create anIRIx
that is suitable for use in RDF.- Throws:
IRIException
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createAny
Create anIRIx
for any string. It returns a IRIx holder and does no checking whatsoever. Whether the IRI "works" is down to care by the application.- Throws:
IRIException
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isAbsolute
public abstract boolean isAbsolute()An absolute URI is one with a URI scheme and without a fragment. The other components, host (authority), path, and query, are optional.absolute-URI = scheme ":" hier-part [ "?" query ]
Beware of the meaning :
http:abc
is an absolute URI - it has only a schema and a path without a root.Note that a URI can be both "not absolute" and "not relative", e.g.
http://example/path#fragment
.See isReference() for testing whether a URI is suitable for use in RDF.
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isRelative
public abstract boolean isRelative()A relative URI one without a scheme, and maybe without some of the other parts.Often it is just the path part.
See isReference() for testing whether a URI is suitable for use in RDF.
Note that a URI can be both "not absolute" and "not relative", e.g.
http://example/path#fragment
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hasScheme
Test whether the IRI has the given scheme name.The scheme name should be lowercase.
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isReference
public abstract boolean isReference()An RDF Reference is an URI which has scheme. If it is hierarchical, it should have a non-empty host authority. It may have a query component and may have a fragment component. This not a term in RFC 3986 and it is not the same as "absolute URI".In RDF data it is a useful concept. It is either an absolute URI, but if it is hierarchical, it must have a host.
Examples:
- http://www.w3.org/
- http://www.w3.org/1999/02/22-rdf-syntax-ns#type
- urn:abc:def
- urn:abc:def#frag
- http:abc -- no host authority; HTTP is a hierarchical URI scheme
- http:// -- the http(s) URI scheme requires the host to be not empty if there is an authority component.
In practical terms:
- It has a scheme name.
- It does not have user info ("user:password@")
- It can have a fragment.
- If it is an HTTP URI:
- It has a host authority, that is, a "//" section
- It should have a path (starting "/" after the host authority) but this is not required.
- If it is a URN (RFC8141), which is a "rootless URI" with no "//" part:
- Optionally, it can have a r-component (though this is not advised), a q-component, and a f-component (which is a URI fragment).
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resolve
Try to resolve a string against this IRI as base. This call is "base.resolver(possibleRelativeIRI)". ThrowIRIException
if the string does not conform to the IRI grammar. -
resolve
Try to resolve a string against this IRI as base. ThrowIRIException
if the string does not conform to the IRI grammar. Return the original IRIx if there is no change. -
normalize
Syntax-based Normalization Normalize anIRIx
. -
relativize
Return (if possible), an IRI that is relative to the base argument. If this IRI is a relative path, this is returned unchanged.The base ("this" object) must have a scheme, have no fragment and no query string. Only the path name is made relative.
If no relative IRI can be found, return null.
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str
Return the URI as string. This has a stronger contract than "toString". "Object.toString" is a user readable string (e.g. it might add enclosing "<>" or show the parsed structure of the IRI) whereasasString()
is by contract the string that comprises the IRI. The string returned may be the normalized form. It is guaranteed to be usable as string in other API calls that expect a IRI in string form if the original input was a legal IRI by the RFC grammar and any additional scheme-specific rules the IRI provider enforces. -
getImpl
Return the implementation object of the provider. The class of the object depends on the provider. -
hashCode
public abstract int hashCode() -
equals
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toString
User readable form. Not guaranteed to be usable as a string in other API calls. Usestr()
to get a string form that represents the IRI in the RFC grammar.
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