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/*
 * Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
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/*
 * $Id: RetrievalMethod.java,v 1.8 2005/05/10 16:35:35 mullan Exp $
 */
package javax.xml.crypto.dsig.keyinfo;

import javax.xml.crypto.Data;
import javax.xml.crypto.URIReference;
import javax.xml.crypto.URIReferenceException;
import javax.xml.crypto.XMLCryptoContext;
import javax.xml.crypto.XMLStructure;
import javax.xml.crypto.dsig.Transform;
import java.util.List;


A representation of the XML RetrievalMethod element as
defined in the 
W3C Recommendation for XML-Signature Syntax and Processing.
A RetrievalMethod object is used to convey a reference to
KeyInfo information that is stored at another location.
The XML schema definition is defined as:

  <element name="RetrievalMethod" type="ds:RetrievalMethodType"/>
  <complexType name="RetrievalMethodType">
    <sequence>
      <element name="Transforms" type="ds:TransformsType" minOccurs="0"/>
    </sequence>
    <attribute name="URI" type="anyURI"/>
    <attribute name="Type" type="anyURI" use="optional"/>
  </complexType>


A RetrievalMethod instance may be created by invoking one of the newRetrievalMethod methods of the KeyInfoFactory class, and passing it the URI identifying the location of the KeyInfo, an optional type URI identifying the type of KeyInfo, and an optional list of Transforms; for example: 
  KeyInfoFactory factory = KeyInfoFactory.getInstance("DOM");
  RetrievalMethod rm = factory.newRetrievalMethod
     ("#KeyValue-1", KeyValue.DSA_TYPE, Collections.singletonList(Transform.BASE64));



Author:Sean Mullan, JSR 105 Expert Group
See Also:
Since:1.6
/**
 * A representation of the XML <code>RetrievalMethod</code> element as
 * defined in the <a href="http://www.w3.org/TR/xmldsig-core/">
 * W3C Recommendation for XML-Signature Syntax and Processing</a>.
 * A <code>RetrievalMethod</code> object is used to convey a reference to
 * <code>KeyInfo</code> information that is stored at another location.
 * The XML schema definition is defined as:
 *
 * <pre>
 *   &lt;element name="RetrievalMethod" type="ds:RetrievalMethodType"/&gt;
 *   &lt;complexType name="RetrievalMethodType"&gt;
 *     &lt;sequence&gt;
 *       &lt;element name="Transforms" type="ds:TransformsType" minOccurs="0"/&gt;
 *     &lt;/sequence&gt;
 *     &lt;attribute name="URI" type="anyURI"/&gt;
 *     &lt;attribute name="Type" type="anyURI" use="optional"/&gt;
 *   &lt;/complexType&gt;
 * </pre>
 *
 * A <code>RetrievalMethod</code> instance may be created by invoking one of the
 * {@link KeyInfoFactory#newRetrievalMethod newRetrievalMethod} methods
 * of the {@link KeyInfoFactory} class, and passing it the URI
 * identifying the location of the KeyInfo, an optional type URI identifying
 * the type of KeyInfo, and an optional list of {@link Transform}s; for example:
 * <pre>
 *   KeyInfoFactory factory = KeyInfoFactory.getInstance("DOM");
 *   RetrievalMethod rm = factory.newRetrievalMethod
 *      ("#KeyValue-1", KeyValue.DSA_TYPE, Collections.singletonList(Transform.BASE64));
 * </pre>
 *
 * @author Sean Mullan
 * @author JSR 105 Expert Group
 * @since 1.6
 * @see KeyInfoFactory#newRetrievalMethod(String)
 * @see KeyInfoFactory#newRetrievalMethod(String, String, List)
 */
public interface RetrievalMethod extends URIReference, XMLStructure {

    
Returns an unmodifiable
list of Transforms of this RetrievalMethod.

Returns:an unmodifiable list of Transform objects (may be
   empty but never null).
/**
     * Returns an {@link java.util.Collections#unmodifiableList unmodifiable
     * list} of {@link Transform}s of this <code>RetrievalMethod</code>.
     *
     * @return an unmodifiable list of <code>Transform</code> objects (may be
     *    empty but never <code>null</code>).
     */
    List getTransforms();

    
Returns the URI of the referenced KeyInfo information.

Returns:the URI of the referenced KeyInfo information in
   RFC 2396 format (never null)
/**
     * Returns the URI of the referenced <code>KeyInfo</code> information.
     *
     * @return the URI of the referenced <code>KeyInfo</code> information in
     *    RFC 2396 format (never <code>null</code>)
     */
    String getURI();

   
Dereferences the KeyInfo information referenced by this
RetrievalMethod and applies the specified
Transforms.

Params:
  • context – an XMLCryptoContext that may contain
   additional useful information for dereferencing the URI. The
   context's baseURI and dereferencer
   parameters (if specified) are used to resolve and dereference this
   RetrievalMethod
Throws:
Returns:a Data object representing the raw contents of the
   KeyInfo information referenced by this
   RetrievalMethod. It is the caller's responsibility to
   convert the returned data to an appropriate
   KeyInfo object.
/**
    * Dereferences the <code>KeyInfo</code> information referenced by this
    * <code>RetrievalMethod</code> and applies the specified
    * <code>Transform</code>s.
    *
    * @param context an <code>XMLCryptoContext</code> that may contain
    *    additional useful information for dereferencing the URI. The
    *    context's <code>baseURI</code> and <code>dereferencer</code>
    *    parameters (if specified) are used to resolve and dereference this
    *    <code>RetrievalMethod</code>
    * @return a <code>Data</code> object representing the raw contents of the
    *    <code>KeyInfo</code> information referenced by this
    *    <code>RetrievalMethod</code>. It is the caller's responsibility to
    *    convert the returned data to an appropriate
    *    <code>KeyInfo</code> object.
    * @throws NullPointerException if <code>context</code> is <code>null</code>
    * @throws URIReferenceException if there is an error while dereferencing
    */
    Data dereference(XMLCryptoContext context) throws URIReferenceException;
}