Reference

All Superinterfaces:: URIReference, XMLStructure

public interface Reference
extends URIReference, XMLStructure

A representation of the Reference element as defined in the W3C Recommendation for XML-Signature Syntax and Processing. The XML schema is defined as:

 <element name="Reference" type="ds:ReferenceType"/>
 <complexType name="ReferenceType">
   <sequence>
     <element ref="ds:Transforms" minOccurs="0"/>
     <element ref="ds:DigestMethod"/>
     <element ref="ds:DigestValue"/>
   </sequence>
   <attribute name="Id" type="ID" use="optional"/>
   <attribute name="URI" type="anyURI" use="optional"/>
   <attribute name="Type" type="anyURI" use="optional"/>
 </complexType>

 <element name="DigestValue" type="ds:DigestValueType"/>
 <simpleType name="DigestValueType">
   <restriction base="base64Binary"/>
 </simpleType>

A Reference instance may be created by invoking one of the newReference methods of the XMLSignatureFactory class; for example:

   XMLSignatureFactory factory = XMLSignatureFactory.getInstance("DOM");
   Reference ref = factory.newReference
     ("http://www.ietf.org/rfc/rfc3275.txt",
      factory.newDigestMethod(DigestMethod.SHA1, null));

Since:: 1.6
See Also:: XMLSignatureFactory.newReference(String, DigestMethod), XMLSignatureFactory.newReference(String, DigestMethod, List, String, String)

Method Summary

All Methods

Instance Methods

Abstract Methods
Modifier and Type	Method and Description
`byte[]`	`getCalculatedDigestValue()` Returns the calculated digest value of this `Reference` after a validation operation.
`Data`	`getDereferencedData()` Returns the dereferenced data, if reference caching is enabled.
`InputStream`	`getDigestInputStream()` Returns the pre-digested input stream, if reference caching is enabled.
`DigestMethod`	`getDigestMethod()` Returns the digest method of this `Reference`.
`byte[]`	`getDigestValue()` Returns the digest value of this `Reference`.
`String`	`getId()` Returns the optional `Id` attribute of this `Reference`, which permits this reference to be referenced from elsewhere.
`List`	`getTransforms()` Returns an `unmodifiable list` of `Transform`s that are contained in this `Reference`.
`boolean`	`validate(XMLValidateContext validateContext)` Validates this reference.

Methods inherited from interface javax.xml.crypto.URIReference
getType, getURI

Methods inherited from interface javax.xml.crypto.XMLStructure
isFeatureSupported

- Method Detail
  - getTransforms
```
List getTransforms()
```
    Returns an unmodifiable list of Transforms that are contained in this Reference.
    
    Returns:
    
    an unmodifiable list of Transforms (may be empty but never null)
  - getDigestMethod
```
DigestMethod getDigestMethod()
```
    Returns the digest method of this Reference.
    
    Returns:
    
    the digest method
  - getId
```
String getId()
```
    Returns the optional Id attribute of this Reference, which permits this reference to be referenced from elsewhere.
    
    Returns:
    
    the Id attribute (may be null if not specified)
  - getDigestValue
```
byte[] getDigestValue()
```
    Returns the digest value of this Reference.
    
    Returns:
    
    the raw digest value, or null if this reference has not been digested yet. Each invocation of this method returns a new clone to protect against subsequent modification.
  - getCalculatedDigestValue
```
byte[] getCalculatedDigestValue()
```
    Returns the calculated digest value of this Reference after a validation operation. This method is useful for debugging if the reference fails to validate.
    
    Returns:
    
    the calculated digest value, or null if this reference has not been validated yet. Each invocation of this method returns a new clone to protect against subsequent modification.
  - validate
```
boolean validate(XMLValidateContext validateContext)
          throws XMLSignatureException
```
    Validates this reference. This method verifies the digest of this reference.
    This method only validates the reference the first time it is invoked. On subsequent invocations, it returns a cached result.
    
    Parameters:
    
    validateContext - the validating context
    
    Returns:
    
    true if this reference was validated successfully; false otherwise
    
    Throws:
    
    NullPointerException - if validateContext is null
    
    XMLSignatureException - if an unexpected exception occurs while validating the reference
  - getDereferencedData
```
Data getDereferencedData()
```
    Returns the dereferenced data, if reference caching is enabled. This is the result of dereferencing the URI of this reference during a validation or generation operation.
    
    Returns:
    
    the dereferenced data, or null if reference caching is not enabled or this reference has not been generated or validated
  - getDigestInputStream
```
InputStream getDigestInputStream()
```
    Returns the pre-digested input stream, if reference caching is enabled. This is the input to the digest operation during a validation or signing operation.
    
    Returns:
    
    an input stream containing the pre-digested input, or null if reference caching is not enabled or this reference has not been generated or validated

Interface Reference

Method Summary

Methods inherited from interface javax.xml.crypto.URIReference

Methods inherited from interface javax.xml.crypto.XMLStructure

Method Detail

getTransforms

getDigestMethod

getId

getDigestValue

getCalculatedDigestValue

validate

getDereferencedData

getDigestInputStream