javax.xml.bind.attachment.AttachmentUnmarshaller Maven / Gradle / Ivy

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package javax.xml.bind.attachment;

import javax.activation.DataHandler;

/**
 * Enables JAXB unmarshalling of a root document containing optimized binary data formats.
 *
 * This API enables an efficient cooperative processing of optimized
 * binary data formats between a JAXB 2.0 implementation and MIME-based package
 * processor (MTOM/XOP and WS-I AP 1.0). JAXB unmarshals the body of a package, delegating the 
 * understanding of the packaging format being used to a MIME-based 
 * package processor that implements this abstract class.
 *
 * This abstract class identifies if a package requires XOP processing, {@link #isXOPPackage()} and provides retrieval of binary content stored as attachments by content-id.
 *
 * Identifying the content-id, cid, to pass to getAttachment*(String cid)
 * 
 * 
 * For XOP processing, the infoset representation of the cid is described 
 * in step 2a in 
 * Section 3.2 Interpreting XOP Packages
 * 
 * 
 * For WS-I AP 1.0, the cid is identified as an element or attribute of 
 * type ref:swaRef  specified in 
 * Section 4.4 Referencing Attachments from the SOAP Envelope
 * 
 * 
 * 
 * @author Marc Hadley
 * @author Kohsuke Kawaguchi
 * @author Joseph Fialli
 * 
 * @since JAXB 2.0
 * 
 * @see javax.xml.bind.Unmarshaller#setAttachmentUnmarshaller(AttachmentUnmarshaller)
 *
 * @see XML-binary Optimized Packaging
 * @see WS-I Attachments Profile Version 1.0.
 * @see Describing Media Content of Binary Data in XML
 */
public abstract class AttachmentUnmarshaller {
   /**
    * Lookup MIME content by content-id, cid, and return as a {@link DataHandler}.
    * 
    * The returned DataHandler instance must be configured
    * to meet the following required mapping constaint. 
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    *       Required Mappings between MIME and Java Types
    *       
MIME Type Java Type
DataHandler.getContentType() instanceof DataHandler.getContent()
image/gif java.awt.Image
image/jpeg java.awt.Image
text/xml  or application/xml javax.xml.transform.Source
    * Note that it is allowable to support additional mappings.
    * 
    * @param cid It is expected to be a valid lexical form of the XML Schema 
    * xs:anyURI datatype. If {@link #isXOPPackage()}
    * ==true, it must be a valid URI per the cid: URI scheme (see RFC 2387)
    * 
    * @return
    *       a {@link DataHandler} that represents the MIME attachment.
    *
    * @throws IllegalArgumentException if the attachment for the given cid is not found.
    */
   public abstract DataHandler getAttachmentAsDataHandler(String cid);

    /**
     * Retrieve the attachment identified by content-id, cid,  as a byte[].
     *
     * @param cid It is expected to be a valid lexical form of the XML Schema 
     * xs:anyURI datatype. If {@link #isXOPPackage()}
     * ==true, it must be a valid URI per the cid: URI scheme (see RFC 2387)
     *
     * @return byte[] representation of attachment identified by cid.
     * 
    * @throws IllegalArgumentException if the attachment for the given cid is not found.
     */
    public abstract byte[] getAttachmentAsByteArray(String cid);

    /**
     * Read-only property that returns true if JAXB unmarshaller needs to perform XOP processing.
     *
     * This method returns true when the constraints specified
     * in  Identifying XOP Documents are met.
     * This value must not change during the unmarshalling process.
     *
     * @return true when MIME context is a XOP Document.
     */
    public boolean isXOPPackage() { return false; } 
}
* Required Mappings between MIME and Java Types *
MIME Type	Java Type
`DataHandler.getContentType()`	`instanceof DataHandler.getContent()`
image/gif	java.awt.Image
image/jpeg	java.awt.Image
text/xml or application/xml	javax.xml.transform.Source