class:Transform [NONE]

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)

field:BASE64 [NONE]

BASE64
```
static final String BASE64
```
The Base64 transform algorithm URI.

See Also:

Constant Field Values

field:ENVELOPED [NONE]

ENVELOPED
```
static final String ENVELOPED
```
The Enveloped Signature transform algorithm URI.

See Also:

Constant Field Values

field:XPATH [NONE]

XPATH
```
static final String XPATH
```
The XPath transform algorithm URI.

See Also:

Constant Field Values

field:XPATH2 [NONE]

XPATH2
```
static final String XPATH2
```
The XPath Filter 2 transform algorithm URI.

See Also:

Constant Field Values

field:XSLT [NONE]

XSLT
```
static final String XSLT
```
The XSLT transform algorithm URI.

See Also:

Constant Field Values

method:getParameterSpec() [NONE]

getParameterSpec
```
AlgorithmParameterSpec getParameterSpec()
```
Returns the algorithm-specific input parameters associated with this Transform.
The returned parameters can be typecast to a TransformParameterSpec object.

Specified by:

getParameterSpec in interface AlgorithmMethod

Returns:

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

method:transform(javax.xml.crypto.Data,javax.xml.crypto.XMLCryptoContext) [NONE]

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

method:transform(javax.xml.crypto.Data,javax.xml.crypto.XMLCryptoContext,java.io.OutputStream) [NONE]

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