org.jvnet.staxex.XMLStreamReaderEx Maven / Gradle / Ivy
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
package org.jvnet.staxex;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamException;
/**
* {@link XMLStreamReader} extended for reading binary data.
*
*
* Some producer of infoset (in particular, such as FastInfoset,
* XOP deecoder), usees a native format that enables efficient
* treatment of binary data. For ordinary infoset consumer
* (that just uses {@link XMLStreamReader}, those binary data
* will just look like base64-encoded string, but this interface
* allows consumers of such infoset to access this raw binary data.
* Such infoset producer may choose to implement this additoinal
* interface, to expose this functionality.
*
*
* Consumers that are capable of using this interface can query
* {@link XMLStreamReader} if it supports this by simply downcasting
* it to this interface like this:
*
*
* XMLStreamReader reader = ...;
* if( reader instanceof XMLStreamReaderEx ) {
* // this reader supports binary data exchange
* ...
* } else {
* // noop
* ...
* }
*
*
*
* Also note that it is also allowed for the infoset producer
* to implement this interface in such a way that {@link #getPCDATA()}
* always delegate to {@link #getText()}, although it's not desirable.
*
*
* This interface is a private contract between such producers
* and consumers to allow them to exchange binary data without
* converting it to base64.
*
* @see XMLStreamWriterEx
* @author Kohsuke Kawaguchi
* @author Paul Sandoz
*/
public interface XMLStreamReaderEx extends XMLStreamReader {
///**
// * Works like {@link XMLStreamReader#getText()}
// * but returns text as {@link DataSource}.
// *
// *
// * This method can be invoked whenever {@link XMLStreamReader#getText()}
// * can be invoked. Invoking this method means the caller is assuming
// * that the text is (conceptually) base64-encoded binary data.
// *
// *
// * This abstraction is necessary to treat XOP as infoset encoding.
// * That is, you can either access the XOP-attached binary through
// * {@link XMLStreamReader#getText()} (in which case you'll see the
// * base64 encoded string), or you can access it as a binary data
// * directly by using this method.
// *
// *
// * Note that even if you are reading from non XOP-aware {@link XMLStreamReader},
// * this method must be still supported; if the reader is pointing
// * to a text, this method is responsible for decoding base64 and
// * producing a {@link DataHandler} with "application/octet-stream"
// * as the content type.
// *
// * @return
// * always non-null valid object.
// * Invocations of this method may return the same object as long
// * as the {@link XMLStreamReader#next()} method is not used,
// * but otherwise {@link DataSource} object returned from this method
// * is considered to be owned by the client, and therefore it shouldn't
// * be reused by the implementation of this method.
// *
// *
// * The returned {@link DataSource} is read-only, and the caller
// * must not invoke {@link DataSource#getOutputStream()}.
// *
// * @throws IllegalStateException
// * if the parser is not pointing at characters infoset item.
// * @throws XMLStreamException
// * if the parser points to text but text is not base64-encoded text,
// * or if some other parsing error occurs (such as if the <xop:Include>
// * points to a non-existing attachment.)
// *
// *
// * It is also OK for this method to return successfully, only to fail
// * during an {@link InputStream} is read from {@link DataSource}.
// */
//DataSource getTextAsDataHandler() throws XMLStreamException;
///**
// * Works like {@link XMLStreamReader#getText()}
// * but returns text as {@link byte[]}.
// *
// *
// * The contract of this method is mostly the same as
// * {@link #getTextAsDataHandler()}, except that this
// * method returns the binary datas as an exact-size byte[].
// *
// *
// * This method is also not capable of reporting the content type
// * of this binary data, even if it is available to the parser.
// *
// * @see #getTextAsDataHandler()
// */
//byte[] getTextAsByteArray() throws XMLStreamException;
/**
* Works like {@link #getText()}
* but hides the actual data representation.
*
* @return
* The {@link CharSequence} that represents the
* character infoset items at the current position.
*
*
* The {@link CharSequence} is normally a {@link String},
* but can be any other {@link CharSequence} implementation.
* For binary data, however, use of {@link Base64Data} is
* recommended (so that the consumer interested in seeing it
* as binary data may take advantage of mor efficient
* data representation.)
*
*
* The object returned from this method belongs to the parser,
* and its content is guaranteed to be the same only until
* the {@link #next()} method is invoked.
*
* @throws IllegalStateException
* if the parser is not pointing at characters infoset item.
*
* TODO:
* fix the dependency to JAXB internal class.
*/
CharSequence getPCDATA() throws XMLStreamException;
/**
* {@inheritDoc}
*/
NamespaceContextEx getNamespaceContext();
/**
* Works like {@link #getElementText()} but trims the leading
* and trailing whitespace.
*
*
* The parser can often do this more efficiently than
* {@code getElementText().trim()}.
*
* @see #getElementText()
*/
String getElementTextTrim() throws XMLStreamException;
}