XMLSignatureFactory (Java Platform SE 6) (original) (raw)

javax.xml.crypto.dsig

Class XMLSignatureFactory

java.lang.Object javax.xml.crypto.dsig.XMLSignatureFactory

public abstract class XMLSignatureFactory

extends Object

A factory for creating XMLSignature objects from scratch or for unmarshalling an XMLSignature object from a corresponding XML representation.

Each instance of XMLSignatureFactory supports a specific XML mechanism type. To create an XMLSignatureFactory, call one of the static getInstance methods, passing in the XML mechanism type desired, for example:

XMLSignatureFactory factory = XMLSignatureFactory.getInstance("DOM");

The objects that this factory produces will be based on DOM and abide by the DOM interoperability requirements as defined in the[ DOM Mechanism Requirements](../../../../../technotes/guides/security/xmldsig/overview.html#DOM Mechanism Requirements) section of the API overview. See the[ Service Providers](../../../../../technotes/guides/security/xmldsig/overview.html#Service Provider) section of the API overview for a list of standard mechanism types.

XMLSignatureFactory implementations are registered and loaded using the Provider mechanism. For example, a service provider that supports the DOM mechanism would be specified in the Provider subclass as:

 put("XMLSignatureFactory.DOM", "org.example.DOMXMLSignatureFactory");

An implementation MUST minimally support the default mechanism type: DOM.

Note that a caller must use the same XMLSignatureFactory instance to create the XMLStructures of a particular XMLSignature that is to be generated. The behavior is undefined if XMLStructures from different providers or different mechanism types are used together.

Also, the XMLStructures that are created by this factory may contain state specific to the XMLSignature and are not intended to be reusable.

Creating XMLSignatures from scratch

Once the XMLSignatureFactory has been created, objects can be instantiated by calling the appropriate method. For example, aReference instance may be created by invoking one of the[newReference](../../../../javax/xml/crypto/dsig/XMLSignatureFactory.html#newReference%28java.lang.String, javax.xml.crypto.dsig.DigestMethod%29) methods.

Unmarshalling XMLSignatures from XML

Alternatively, an XMLSignature may be created from an existing XML representation by invoking the unmarshalXMLSignature method and passing it a mechanism-specific XMLValidateContext instance containing the XML content:

DOMValidateContext context = new DOMValidateContext(key, signatureElement); XMLSignature signature = factory.unmarshalXMLSignature(context);

Each XMLSignatureFactory must support the required XMLValidateContext types for that factory type, but may support others. A DOM XMLSignatureFactory must support DOMValidateContext objects.

Signing and marshalling XMLSignatures to XML

Each XMLSignature created by the factory can also be marshalled to an XML representation and signed, by invoking the sign method of the XMLSignature object and passing it a mechanism-specific XMLSignContext object containing the signing key and marshalling parameters (see DOMSignContext). For example:

DOMSignContext context = new DOMSignContext(privateKey, document);
signature.sign(context);

Concurrent Access

The static methods of this class are guaranteed to be thread-safe. Multiple threads may concurrently invoke the static methods defined in this class with no ill effects.

However, this is not true for the non-static methods defined by this class. Unless otherwise documented by a specific provider, threads that need to access a single XMLSignatureFactory instance concurrently should synchronize amongst themselves and provide the necessary locking. Multiple threads each manipulating a different XMLSignatureFactory instance need not synchronize.

Since:

1.6

XMLSignatureFactory

protected XMLSignatureFactory()

Default constructor, for invocation by subclasses.

getInstance

public static XMLSignatureFactory getInstance(String mechanismType)

Returns an XMLSignatureFactory that supports the specified XML processing mechanism and representation type (ex: "DOM").

This method uses the standard JCA provider lookup mechanism to locate and instantiate an XMLSignatureFactory implementation of the desired mechanism type. It traverses the list of registered security Providers, starting with the most preferred Provider. A new XMLSignatureFactory object from the first Provider that supports the specified mechanism is returned.

Note that the list of registered providers may be retrieved via the Security.getProviders() method.

Parameters:

mechanismType - the type of the XML processing mechanism and representation. See the [ Service Providers](../../../../../technotes/guides/security/xmldsig/overview.html#Service Provider) section of the API overview for a list of standard mechanism types.

Returns:

a new XMLSignatureFactory

Throws:

[NullPointerException](../../../../java/lang/NullPointerException.html "class in java.lang") - if mechanismType is null

[NoSuchMechanismException](../../../../javax/xml/crypto/NoSuchMechanismException.html "class in javax.xml.crypto") - if no Provider supports an XMLSignatureFactory implementation for the specified mechanism

See Also:

Provider

getInstance

public static XMLSignatureFactory getInstance(String mechanismType, Provider provider)

Returns an XMLSignatureFactory that supports the requested XML processing mechanism and representation type (ex: "DOM"), as supplied by the specified provider. Note that the specified Provider object does not have to be registered in the provider list.

Parameters:

mechanismType - the type of the XML processing mechanism and representation. See the [ Service Providers](../../../../../technotes/guides/security/xmldsig/overview.html#Service Provider) section of the API overview for a list of standard mechanism types.

provider - the Provider object

Returns:

a new XMLSignatureFactory

Throws:

[NullPointerException](../../../../java/lang/NullPointerException.html "class in java.lang") - if provider or mechanismType is null

[NoSuchMechanismException](../../../../javax/xml/crypto/NoSuchMechanismException.html "class in javax.xml.crypto") - if an XMLSignatureFactory implementation for the specified mechanism is not available from the specified Provider object

See Also:

Provider

getInstance

public static XMLSignatureFactory getInstance(String mechanismType, String provider) throws NoSuchProviderException

Returns an XMLSignatureFactory that supports the requested XML processing mechanism and representation type (ex: "DOM"), as supplied by the specified provider. The specified provider must be registered in the security provider list.

Note that the list of registered providers may be retrieved via the Security.getProviders() method.

Parameters:

mechanismType - the type of the XML processing mechanism and representation. See the [ Service Providers](../../../../../technotes/guides/security/xmldsig/overview.html#Service Provider) section of the API overview for a list of standard mechanism types.

provider - the string name of the provider

Returns:

a new XMLSignatureFactory

Throws:

[NoSuchProviderException](../../../../java/security/NoSuchProviderException.html "class in java.security") - if the specified provider is not registered in the security provider list

[NullPointerException](../../../../java/lang/NullPointerException.html "class in java.lang") - if provider or mechanismType is null

[NoSuchMechanismException](../../../../javax/xml/crypto/NoSuchMechanismException.html "class in javax.xml.crypto") - if an XMLSignatureFactory implementation for the specified mechanism is not available from the specified provider

See Also:

Provider

getInstance

public static XMLSignatureFactory getInstance()

Returns an XMLSignatureFactory that supports the default XML processing mechanism and representation type ("DOM").

This method uses the standard JCA provider lookup mechanism to locate and instantiate an XMLSignatureFactory implementation of the default mechanism type. It traverses the list of registered security Providers, starting with the most preferred Provider. A new XMLSignatureFactory object from the first Provider that supports the DOM mechanism is returned.

Note that the list of registered providers may be retrieved via the Security.getProviders() method.

Returns:

a new XMLSignatureFactory

Throws:

[NoSuchMechanismException](../../../../javax/xml/crypto/NoSuchMechanismException.html "class in javax.xml.crypto") - if no Provider supports an XMLSignatureFactory implementation for the DOM mechanism

See Also:

Provider

getMechanismType

public final String getMechanismType()

Returns the type of the XML processing mechanism and representation supported by this XMLSignatureFactory (ex: "DOM").

Returns:

the XML processing mechanism type supported by thisXMLSignatureFactory

getProvider

public final Provider getProvider()

Returns the provider of this XMLSignatureFactory.

Returns:

the provider of this XMLSignatureFactory

newXMLSignature

public abstract XMLSignature newXMLSignature(SignedInfo si, KeyInfo ki)

Creates an XMLSignature and initializes it with the contents of the specified SignedInfo and KeyInfo objects.

Parameters:

si - the signed info

ki - the key info (may be null)

Returns:

an XMLSignature

Throws:

[NullPointerException](../../../../java/lang/NullPointerException.html "class in java.lang") - if si is null

newXMLSignature

public abstract XMLSignature newXMLSignature(SignedInfo si, KeyInfo ki, List objects, String id, String signatureValueId)

Creates an XMLSignature and initializes it with the specified parameters.

Parameters:

si - the signed info

ki - the key info (may be null)

objects - a list of XMLObjects (may be empty ornull)

id - the Id (may be null)

signatureValueId - the SignatureValue Id (may be null)

Returns:

an XMLSignature

Throws:

[NullPointerException](../../../../java/lang/NullPointerException.html "class in java.lang") - if si is null

[ClassCastException](../../../../java/lang/ClassCastException.html "class in java.lang") - if any of the objects are not of type XMLObject

newReference

public abstract Reference newReference(String uri, DigestMethod dm)

Creates a Reference with the specified URI and digest method.

Parameters:

uri - the reference URI (may be null)

dm - the digest method

Returns:

a Reference

Throws:

[IllegalArgumentException](../../../../java/lang/IllegalArgumentException.html "class in java.lang") - if uri is not RFC 2396 compliant

[NullPointerException](../../../../java/lang/NullPointerException.html "class in java.lang") - if dm is null

newReference

public abstract Reference newReference(String uri, DigestMethod dm, List transforms, String type, String id)

Creates a Reference with the specified parameters.

Parameters:

uri - the reference URI (may be null)

dm - the digest method

transforms - a list of Transforms. The list is defensively copied to protect against subsequent modification. May be null or empty.

type - the reference type, as a URI (may be null)

id - the reference ID (may be null)

Returns:

a Reference

Throws:

[ClassCastException](../../../../java/lang/ClassCastException.html "class in java.lang") - if any of the transforms are not of type Transform

[IllegalArgumentException](../../../../java/lang/IllegalArgumentException.html "class in java.lang") - if uri is not RFC 2396 compliant

[NullPointerException](../../../../java/lang/NullPointerException.html "class in java.lang") - if dm is null

newReference

public abstract Reference newReference(String uri, DigestMethod dm, List transforms, String type, String id, byte[] digestValue)

Creates a Reference with the specified parameters and pre-calculated digest value.

This method is useful when the digest value of a Reference has been previously computed. See for example, the OASIS-DSS (Digital Signature Services) specification.

Parameters:

uri - the reference URI (may be null)

dm - the digest method

transforms - a list of Transforms. The list is defensively copied to protect against subsequent modification. May be null or empty.

type - the reference type, as a URI (may be null)

id - the reference ID (may be null)

digestValue - the digest value. The array is cloned to protect against subsequent modification.

Returns:

a Reference

Throws:

[ClassCastException](../../../../java/lang/ClassCastException.html "class in java.lang") - if any of the transforms are not of type Transform

[IllegalArgumentException](../../../../java/lang/IllegalArgumentException.html "class in java.lang") - if uri is not RFC 2396 compliant

[NullPointerException](../../../../java/lang/NullPointerException.html "class in java.lang") - if dm or digestValue is null

newReference

public abstract Reference newReference(String uri, DigestMethod dm, List appliedTransforms, Data result, List transforms, String type, String id)

Creates a Reference with the specified parameters.

This method is useful when a list of transforms have already been applied to the Reference. See for example, the OASIS-DSS (Digital Signature Services) specification.

When an XMLSignature containing this reference is generated, the specified transforms (if non-null) are applied to the specified result. The Transforms element of the resulting Reference element is set to the concatenation of the appliedTransforms and transforms.

Parameters:

uri - the reference URI (may be null)

dm - the digest method

appliedTransforms - a list of Transforms that have already been applied. The list is defensively copied to protect against subsequent modification. The list must contain at least one entry.

result - the result of processing the sequence of appliedTransforms

transforms - a list of Transforms that are to be applied when generating the signature. The list is defensively copied to protect against subsequent modification. May be null or empty.

type - the reference type, as a URI (may be null)

id - the reference ID (may be null)

Returns:

a Reference

Throws:

[ClassCastException](../../../../java/lang/ClassCastException.html "class in java.lang") - if any of the transforms (in either list) are not of type Transform

[IllegalArgumentException](../../../../java/lang/IllegalArgumentException.html "class in java.lang") - if uri is not RFC 2396 compliant or appliedTransforms is empty

[NullPointerException](../../../../java/lang/NullPointerException.html "class in java.lang") - if dm, appliedTransforms or result is null

newSignedInfo

public abstract SignedInfo newSignedInfo(CanonicalizationMethod cm, SignatureMethod sm, List references)

Creates a SignedInfo with the specified canonicalization and signature methods, and list of one or more references.

Parameters:

cm - the canonicalization method

sm - the signature method

references - a list of one or more References. The list is defensively copied to protect against subsequent modification.

Returns:

a SignedInfo

Throws:

[ClassCastException](../../../../java/lang/ClassCastException.html "class in java.lang") - if any of the references are not of type Reference

[IllegalArgumentException](../../../../java/lang/IllegalArgumentException.html "class in java.lang") - if references is empty

[NullPointerException](../../../../java/lang/NullPointerException.html "class in java.lang") - if any of the parameters are null

newSignedInfo

public abstract SignedInfo newSignedInfo(CanonicalizationMethod cm, SignatureMethod sm, List references, String id)

Creates a SignedInfo with the specified parameters.

Parameters:

cm - the canonicalization method

sm - the signature method

references - a list of one or more References. The list is defensively copied to protect against subsequent modification.

id - the id (may be null)

Returns:

a SignedInfo

Throws:

[ClassCastException](../../../../java/lang/ClassCastException.html "class in java.lang") - if any of the references are not of type Reference

[IllegalArgumentException](../../../../java/lang/IllegalArgumentException.html "class in java.lang") - if references is empty

[NullPointerException](../../../../java/lang/NullPointerException.html "class in java.lang") - if cm, sm, orreferences are null

newXMLObject

public abstract XMLObject newXMLObject(List content, String id, String mimeType, String encoding)

Creates an XMLObject from the specified parameters.

Parameters:

content - a list of XMLStructures. The list is defensively copied to protect against subsequent modification. May be null or empty.

id - the Id (may be null)

mimeType - the mime type (may be null)

encoding - the encoding (may be null)

Returns:

an XMLObject

Throws:

[ClassCastException](../../../../java/lang/ClassCastException.html "class in java.lang") - if content contains any entries that are not of type XMLStructure

newManifest

public abstract Manifest newManifest(List references)

Creates a Manifest containing the specified list of References.

Parameters:

references - a list of one or more References. The list is defensively copied to protect against subsequent modification.

Returns:

a Manifest

Throws:

[NullPointerException](../../../../java/lang/NullPointerException.html "class in java.lang") - if references is null

[IllegalArgumentException](../../../../java/lang/IllegalArgumentException.html "class in java.lang") - if references is empty

[ClassCastException](../../../../java/lang/ClassCastException.html "class in java.lang") - if references contains any entries that are not of type Reference

newManifest

public abstract Manifest newManifest(List references, String id)

Creates a Manifest containing the specified list of References and optional id.

Parameters:

references - a list of one or more References. The list is defensively copied to protect against subsequent modification.

id - the id (may be null)

Returns:

a Manifest

Throws:

[NullPointerException](../../../../java/lang/NullPointerException.html "class in java.lang") - if references is null

[IllegalArgumentException](../../../../java/lang/IllegalArgumentException.html "class in java.lang") - if references is empty

[ClassCastException](../../../../java/lang/ClassCastException.html "class in java.lang") - if references contains any entries that are not of type Reference

newSignatureProperty

public abstract SignatureProperty newSignatureProperty(List content, String target, String id)

Creates a SignatureProperty containing the specified list of XMLStructures, target URI and optional id.

Parameters:

content - a list of one or more XMLStructures. The list is defensively copied to protect against subsequent modification.

target - the target URI of the Signature that this property applies to

id - the id (may be null)

Returns:

a SignatureProperty

Throws:

[NullPointerException](../../../../java/lang/NullPointerException.html "class in java.lang") - if content or target is null

[IllegalArgumentException](../../../../java/lang/IllegalArgumentException.html "class in java.lang") - if content is empty

[ClassCastException](../../../../java/lang/ClassCastException.html "class in java.lang") - if content contains any entries that are not of type XMLStructure

newSignatureProperties

public abstract SignatureProperties newSignatureProperties(List properties, String id)

Creates a SignatureProperties containing the specified list of SignaturePropertys and optional id.

Parameters:

properties - a list of one or more SignaturePropertys. The list is defensively copied to protect against subsequent modification.

id - the id (may be null)

Returns:

a SignatureProperties

Throws:

[NullPointerException](../../../../java/lang/NullPointerException.html "class in java.lang") - if properties is null

[IllegalArgumentException](../../../../java/lang/IllegalArgumentException.html "class in java.lang") - if properties is empty

[ClassCastException](../../../../java/lang/ClassCastException.html "class in java.lang") - if properties contains any entries that are not of type SignatureProperty

newDigestMethod

public abstract DigestMethod newDigestMethod(String algorithm, DigestMethodParameterSpec params) throws NoSuchAlgorithmException, InvalidAlgorithmParameterException

Creates a DigestMethod for the specified algorithm URI and parameters.

Parameters:

algorithm - the URI identifying the digest algorithm

params - algorithm-specific digest parameters (may be null)

Returns:

the DigestMethod

Throws:

[InvalidAlgorithmParameterException](../../../../java/security/InvalidAlgorithmParameterException.html "class in java.security") - if the specified parameters are inappropriate for the requested algorithm

[NoSuchAlgorithmException](../../../../java/security/NoSuchAlgorithmException.html "class in java.security") - if an implementation of the specified algorithm cannot be found

[NullPointerException](../../../../java/lang/NullPointerException.html "class in java.lang") - if algorithm is null

newSignatureMethod

public abstract SignatureMethod newSignatureMethod(String algorithm, SignatureMethodParameterSpec params) throws NoSuchAlgorithmException, InvalidAlgorithmParameterException

Creates a SignatureMethod for the specified algorithm URI and parameters.

Parameters:

algorithm - the URI identifying the signature algorithm

params - algorithm-specific signature parameters (may be null)

Returns:

the SignatureMethod

Throws:

[InvalidAlgorithmParameterException](../../../../java/security/InvalidAlgorithmParameterException.html "class in java.security") - if the specified parameters are inappropriate for the requested algorithm

[NoSuchAlgorithmException](../../../../java/security/NoSuchAlgorithmException.html "class in java.security") - if an implementation of the specified algorithm cannot be found

[NullPointerException](../../../../java/lang/NullPointerException.html "class in java.lang") - if algorithm is null

newTransform

public abstract Transform newTransform(String algorithm, TransformParameterSpec params) throws NoSuchAlgorithmException, InvalidAlgorithmParameterException

Creates a Transform for the specified algorithm URI and parameters.

Parameters:

algorithm - the URI identifying the transform algorithm

params - algorithm-specific transform parameters (may be null)

Returns:

the Transform

Throws:

[InvalidAlgorithmParameterException](../../../../java/security/InvalidAlgorithmParameterException.html "class in java.security") - if the specified parameters are inappropriate for the requested algorithm

[NoSuchAlgorithmException](../../../../java/security/NoSuchAlgorithmException.html "class in java.security") - if an implementation of the specified algorithm cannot be found

[NullPointerException](../../../../java/lang/NullPointerException.html "class in java.lang") - if algorithm is null

newTransform

public abstract Transform newTransform(String algorithm, XMLStructure params) throws NoSuchAlgorithmException, InvalidAlgorithmParameterException

Creates a Transform for the specified algorithm URI and parameters. The parameters are specified as a mechanism-specificXMLStructure (ex: DOMStructure). This method is useful when the parameters are in XML form or there is no standard class for specifying the parameters.

Parameters:

algorithm - the URI identifying the transform algorithm

params - a mechanism-specific XML structure from which to unmarshal the parameters from (may be null if not required or optional)

Returns:

the Transform

Throws:

[ClassCastException](../../../../java/lang/ClassCastException.html "class in java.lang") - if the type of params is inappropriate for this XMLSignatureFactory

[InvalidAlgorithmParameterException](../../../../java/security/InvalidAlgorithmParameterException.html "class in java.security") - if the specified parameters are inappropriate for the requested algorithm

[NoSuchAlgorithmException](../../../../java/security/NoSuchAlgorithmException.html "class in java.security") - if an implementation of the specified algorithm cannot be found

[NullPointerException](../../../../java/lang/NullPointerException.html "class in java.lang") - if algorithm is null

newCanonicalizationMethod

public abstract CanonicalizationMethod newCanonicalizationMethod(String algorithm, C14NMethodParameterSpec params) throws NoSuchAlgorithmException, InvalidAlgorithmParameterException

Creates a CanonicalizationMethod for the specified algorithm URI and parameters.

Parameters:

algorithm - the URI identifying the canonicalization algorithm

params - algorithm-specific canonicalization parameters (may be null)

Returns:

the CanonicalizationMethod

Throws:

[InvalidAlgorithmParameterException](../../../../java/security/InvalidAlgorithmParameterException.html "class in java.security") - if the specified parameters are inappropriate for the requested algorithm

[NoSuchAlgorithmException](../../../../java/security/NoSuchAlgorithmException.html "class in java.security") - if an implementation of the specified algorithm cannot be found

[NullPointerException](../../../../java/lang/NullPointerException.html "class in java.lang") - if algorithm is null

newCanonicalizationMethod

public abstract CanonicalizationMethod newCanonicalizationMethod(String algorithm, XMLStructure params) throws NoSuchAlgorithmException, InvalidAlgorithmParameterException

Creates a CanonicalizationMethod for the specified algorithm URI and parameters. The parameters are specified as a mechanism-specific XMLStructure (ex: DOMStructure). This method is useful when the parameters are in XML form or there is no standard class for specifying the parameters.

Parameters:

algorithm - the URI identifying the canonicalization algorithm

params - a mechanism-specific XML structure from which to unmarshal the parameters from (may be null if not required or optional)

Returns:

the CanonicalizationMethod

Throws:

[ClassCastException](../../../../java/lang/ClassCastException.html "class in java.lang") - if the type of params is inappropriate for this XMLSignatureFactory

[InvalidAlgorithmParameterException](../../../../java/security/InvalidAlgorithmParameterException.html "class in java.security") - if the specified parameters are inappropriate for the requested algorithm

[NoSuchAlgorithmException](../../../../java/security/NoSuchAlgorithmException.html "class in java.security") - if an implementation of the specified algorithm cannot be found

[NullPointerException](../../../../java/lang/NullPointerException.html "class in java.lang") - if algorithm is null

getKeyInfoFactory

public final KeyInfoFactory getKeyInfoFactory()

Returns a KeyInfoFactory that creates KeyInfo objects. The returned KeyInfoFactory has the same mechanism type and provider as this XMLSignatureFactory.

Returns:

a KeyInfoFactory

Throws:

[NoSuchMechanismException](../../../../javax/xml/crypto/NoSuchMechanismException.html "class in javax.xml.crypto") - if a KeyFactory implementation with the same mechanism type and provider is not available

unmarshalXMLSignature

public abstract XMLSignature unmarshalXMLSignature(XMLValidateContext context) throws MarshalException

Unmarshals a new XMLSignature instance from a mechanism-specific XMLValidateContext instance.

Parameters:

context - a mechanism-specific context from which to unmarshal the signature from

Returns:

the XMLSignature

Throws:

[NullPointerException](../../../../java/lang/NullPointerException.html "class in java.lang") - if context is null

[ClassCastException](../../../../java/lang/ClassCastException.html "class in java.lang") - if the type of context is inappropriate for this factory

[MarshalException](../../../../javax/xml/crypto/MarshalException.html "class in javax.xml.crypto") - if an unrecoverable exception occurs during unmarshalling

unmarshalXMLSignature

public abstract XMLSignature unmarshalXMLSignature(XMLStructure xmlStructure) throws MarshalException

Unmarshals a new XMLSignature instance from a mechanism-specific XMLStructure instance. This method is useful if you only want to unmarshal (and not validate) an XMLSignature.

Parameters:

xmlStructure - a mechanism-specific XML structure from which to unmarshal the signature from

Returns:

the XMLSignature

Throws:

[NullPointerException](../../../../java/lang/NullPointerException.html "class in java.lang") - if xmlStructure is null

[ClassCastException](../../../../java/lang/ClassCastException.html "class in java.lang") - if the type of xmlStructure is inappropriate for this factory

[MarshalException](../../../../javax/xml/crypto/MarshalException.html "class in javax.xml.crypto") - if an unrecoverable exception occurs during unmarshalling

isFeatureSupported

public abstract boolean isFeatureSupported(String feature)

Indicates whether a specified feature is supported.

Parameters:

feature - the feature name (as an absolute URI)

Returns:

true if the specified feature is supported,false otherwise

Throws:

[NullPointerException](../../../../java/lang/NullPointerException.html "class in java.lang") - if feature is null

getURIDereferencer

public abstract URIDereferencer getURIDereferencer()

Returns a reference to the URIDereferencer that is used by default to dereference URIs in Reference objects.

Returns:

a reference to the default URIDereferencer (nevernull)

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