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## javax.xml.crypto.dsig
Interface 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));

Author:
  Sean Mullan, Erwin van der Koogh, JSR 105 Expert Group
See Also:
  `XMLSignatureFactory.newReference(String, DigestMethod)`, `XMLSignatureFactory.newReference(String, DigestMethod, List, String, String)`

Method Summary
`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.
`java.io.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`.
`java.lang.String` | `getId()` Returns the optional `Id` attribute of this `Reference`, which permits this reference to be referenced from elsewhere.
`java.util.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

    java.util.List getTransforms()

  Returns an `unmodifiable list` of `Transform`s that are contained in this `Reference`.

  Returns:
    an unmodifiable list of `Transform`s (may be empty but never `null`)

### getDigestMethod

    DigestMethod getDigestMethod()

  Returns the digest method of this `Reference`.

  Returns:
    the digest method

### getId

    java.lang.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:
    `java.lang.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

    java.io.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

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