Interface Transform

All Superinterfaces:

AlgorithmMethod, XMLStructure

All Known Subinterfaces:

CanonicalizationMethod

All Known Implementing Classes:

TransformService

public interface Transform
extends XMLStructure, AlgorithmMethod

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

<element name="Transform" type="ds:TransformType"/>
   <complexType name="TransformType" mixed="true">
     <choice minOccurs="0" maxOccurs="unbounded">
       <any namespace="##other" processContents="lax"/>
       <!-- (1,1) elements from (0,unbounded) namespaces -->
       <element name="XPath" type="string"/>
     </choice>
     <attribute name="Algorithm" type="anyURI" use="required"/>
   </complexType>

A Transform instance may be created by invoking the newTransform method of the XMLSignatureFactory class.

Since:

1.6

See Also:

XMLSignatureFactory.newTransform(String, TransformParameterSpec)

Fields

BASE64

static final String BASE64

The Base64 transform algorithm URI.

ENVELOPED

static final String ENVELOPED

The Enveloped Signature transform algorithm URI.

XPATH

static final String XPATH

The XPath transform algorithm URI.

XPATH2

static final String XPATH2

The XPath Filter 2 transform algorithm URI.

XSLT

static final String XSLT

The XSLT transform algorithm URI.

Methods

getParameterSpec

AlgorithmParameterSpec getParameterSpec()

Specified by:

getParameterSpec in interface AlgorithmMethod

Returns:

the algorithm-specific input parameters (may be null if not specified)

transform

Data transform(Data data,
               XMLCryptoContext context)
        throws TransformException

Transforms the specified data using the underlying transform algorithm.

Parameters:

data - the data to be transformed

context - the XMLCryptoContext containing additional context (may be null if not applicable)

Returns:

the transformed data

Throws:

NullPointerException - if data is null

TransformException - if an error occurs while executing the transform

transform

Data transform(Data data,
               XMLCryptoContext context,
               OutputStream os)
        throws TransformException

Transforms the specified data using the underlying transform algorithm. If the output of this transform is an OctetStreamData, then this method returns null and the bytes are written to the specified OutputStream. Otherwise, the OutputStream is ignored and the method behaves as if transform(Data, XMLCryptoContext) were invoked.

Parameters:

data - the data to be transformed

context - the XMLCryptoContext containing additional context (may be null if not applicable)

os - the OutputStream that should be used to write the transformed data to

Returns:

the transformed data (or null if the data was written to the OutputStream parameter)

Throws:

NullPointerException - if data or os is null

TransformException - if an error occurs while executing the transform