| /* |
| * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * 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. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package com.sun.xml.internal.org.jvnet.staxex.util; |
| |
| import java.io.IOException; |
| |
| import javax.xml.bind.attachment.AttachmentMarshaller; |
| import javax.xml.stream.XMLStreamConstants; |
| import javax.xml.stream.XMLStreamException; |
| import javax.xml.stream.XMLStreamReader; |
| import javax.xml.stream.XMLStreamWriter; |
| import javax.xml.XMLConstants; |
| |
| import com.sun.xml.internal.org.jvnet.staxex.Base64Data; |
| import com.sun.xml.internal.org.jvnet.staxex.XMLStreamReaderEx; |
| import com.sun.xml.internal.org.jvnet.staxex.XMLStreamWriterEx; |
| |
| /** |
| * Reads a sub-tree from {@link XMLStreamReader} and writes to {@link XMLStreamWriter} |
| * as-is. |
| * |
| * <p> |
| * This class can be sub-classed to implement a simple transformation logic. |
| * |
| * @author Kohsuke Kawaguchi |
| * @author Ryan Shoemaker |
| */ |
| public class XMLStreamReaderToXMLStreamWriter { |
| |
| static public class Breakpoint { |
| protected XMLStreamReader reader; |
| protected XMLStreamWriter writer; |
| |
| public Breakpoint(XMLStreamReader r, XMLStreamWriter w) { reader = r; writer = w; } |
| |
| public XMLStreamReader reader() { return reader; } |
| public XMLStreamWriter writer() { return writer; } |
| public boolean proceedBeforeStartElement() { return true; } |
| public boolean proceedAfterStartElement() { return true; } |
| } |
| |
| private static final int BUF_SIZE = 4096; |
| |
| protected XMLStreamReader in; |
| protected XMLStreamWriter out; |
| |
| private char[] buf; |
| |
| boolean optimizeBase64Data = false; |
| |
| AttachmentMarshaller mtomAttachmentMarshaller; |
| |
| /** |
| * Reads one subtree and writes it out. |
| * |
| * <p> |
| * The {@link XMLStreamWriter} never receives a start/end document event. |
| * Those need to be written separately by the caller. |
| */ |
| public void bridge(XMLStreamReader in, XMLStreamWriter out) throws XMLStreamException { |
| bridge(in, out, null); |
| } |
| |
| public void bridge(Breakpoint breakPoint) throws XMLStreamException { |
| bridge(breakPoint.reader(), breakPoint.writer(), breakPoint); |
| } |
| |
| private void bridge(XMLStreamReader in, XMLStreamWriter out, Breakpoint breakPoint) throws XMLStreamException { |
| assert in!=null && out!=null; |
| this.in = in; |
| this.out = out; |
| |
| optimizeBase64Data = (in instanceof XMLStreamReaderEx); |
| |
| if (out instanceof XMLStreamWriterEx && out instanceof MtomStreamWriter) { |
| mtomAttachmentMarshaller = ((MtomStreamWriter) out).getAttachmentMarshaller(); |
| } |
| // remembers the nest level of elements to know when we are done. |
| int depth=0; |
| |
| buf = new char[BUF_SIZE]; |
| |
| // if the parser is at the start tag, proceed to the first element |
| int event = getEventType(); |
| |
| if( event!=XMLStreamConstants.START_ELEMENT) |
| throw new IllegalStateException("The current event is not START_ELEMENT\n but " + event); |
| |
| do { |
| // These are all of the events listed in the javadoc for |
| // XMLEvent. |
| // The spec only really describes 11 of them. |
| switch (event) { |
| case XMLStreamConstants.START_ELEMENT : |
| if (breakPoint != null && !breakPoint.proceedBeforeStartElement()) return; |
| depth++; |
| handleStartElement(); |
| if (breakPoint != null && !breakPoint.proceedAfterStartElement()) return; |
| break; |
| case XMLStreamConstants.END_ELEMENT : |
| handleEndElement(); |
| depth--; |
| if(depth==0) |
| return; |
| break; |
| case XMLStreamConstants.CHARACTERS : |
| handleCharacters(); |
| break; |
| case XMLStreamConstants.ENTITY_REFERENCE : |
| handleEntityReference(); |
| break; |
| case XMLStreamConstants.PROCESSING_INSTRUCTION : |
| handlePI(); |
| break; |
| case XMLStreamConstants.COMMENT : |
| handleComment(); |
| break; |
| case XMLStreamConstants.DTD : |
| handleDTD(); |
| break; |
| case XMLStreamConstants.CDATA : |
| handleCDATA(); |
| break; |
| case XMLStreamConstants.SPACE : |
| handleSpace(); |
| break; |
| case XMLStreamConstants.END_DOCUMENT: |
| throw new XMLStreamException("Malformed XML at depth="+depth+", Reached EOF. Event="+event); |
| default : |
| throw new XMLStreamException("Cannot process event: " + event); |
| } |
| |
| event=getNextEvent(); |
| } while (depth!=0); |
| } |
| |
| protected void handlePI() throws XMLStreamException { |
| out.writeProcessingInstruction( |
| in.getPITarget(), |
| in.getPIData()); |
| } |
| |
| |
| protected void handleCharacters() throws XMLStreamException { |
| |
| CharSequence c = null; |
| |
| if (optimizeBase64Data) { |
| c = ((XMLStreamReaderEx)in).getPCDATA(); |
| } |
| |
| if ((c != null) && (c instanceof Base64Data)) { |
| if (mtomAttachmentMarshaller != null) { |
| Base64Data b64d = (Base64Data) c; |
| ((XMLStreamWriterEx)out).writeBinary(b64d.getDataHandler()); |
| } else { |
| try { |
| ((Base64Data)c).writeTo(out); |
| } catch (IOException e) { |
| throw new XMLStreamException(e); |
| } |
| } |
| } else { |
| for (int start=0,read=buf.length; read == buf.length; start+=buf.length) { |
| read = in.getTextCharacters(start, buf, 0, buf.length); |
| out.writeCharacters(buf, 0, read); |
| } |
| } |
| } |
| |
| protected void handleEndElement() throws XMLStreamException { |
| out.writeEndElement(); |
| } |
| |
| protected void handleStartElement() throws XMLStreamException { |
| String nsUri = in.getNamespaceURI(); |
| if(nsUri==null) |
| out.writeStartElement(in.getLocalName()); |
| else |
| out.writeStartElement( |
| fixNull(in.getPrefix()), |
| in.getLocalName(), |
| nsUri |
| ); |
| |
| // start namespace bindings |
| int nsCount = in.getNamespaceCount(); |
| for (int i = 0; i < nsCount; i++) { |
| out.writeNamespace( |
| fixNull(in.getNamespacePrefix(i)), //StAX reader will return null for default NS |
| fixNull(in.getNamespaceURI(i))); // zephyr doesn't like null, I don't know what is correct, so just fix null to "" for now |
| } |
| |
| // write attributes |
| int attCount = in.getAttributeCount(); |
| for (int i = 0; i < attCount; i++) { |
| handleAttribute(i); |
| } |
| } |
| |
| /** |
| * Writes out the {@code i}-th attribute of the current element. |
| * |
| * <p> |
| * Used from {@link #handleStartElement()}. |
| */ |
| protected void handleAttribute(int i) throws XMLStreamException { |
| String nsUri = in.getAttributeNamespace(i); |
| String prefix = in.getAttributePrefix(i); |
| if (fixNull(nsUri).equals(XMLConstants.XMLNS_ATTRIBUTE_NS_URI)) { |
| //Its a namespace decl, ignore as it is already written. |
| return; |
| } |
| |
| if(nsUri==null || prefix == null || prefix.equals("")) { |
| out.writeAttribute( |
| in.getAttributeLocalName(i), |
| in.getAttributeValue(i) |
| ); |
| } else { |
| out.writeAttribute( |
| prefix, |
| nsUri, |
| in.getAttributeLocalName(i), |
| in.getAttributeValue(i) |
| ); |
| } |
| } |
| |
| protected void handleDTD() throws XMLStreamException { |
| out.writeDTD(in.getText()); |
| } |
| |
| protected void handleComment() throws XMLStreamException { |
| out.writeComment(in.getText()); |
| } |
| |
| protected void handleEntityReference() throws XMLStreamException { |
| out.writeEntityRef(in.getText()); |
| } |
| |
| protected void handleSpace() throws XMLStreamException { |
| handleCharacters(); |
| } |
| |
| protected void handleCDATA() throws XMLStreamException { |
| out.writeCData(in.getText()); |
| } |
| |
| private static String fixNull(String s) { |
| if(s==null) return ""; |
| else return s; |
| } |
| |
| private int getEventType() throws XMLStreamException { |
| int event = in.getEventType(); |
| // if the parser is at the start tag, proceed to the first element |
| //Note - need to do this every time because we could be using a composite reader |
| if(event == XMLStreamConstants.START_DOCUMENT) { |
| // nextTag doesn't correctly handle DTDs |
| while( !in.isStartElement() ) { |
| event = in.next(); |
| if (event == XMLStreamConstants.COMMENT) |
| handleComment(); |
| } |
| } |
| return event; |
| } |
| |
| private int getNextEvent() throws XMLStreamException { |
| in.next(); |
| return getEventType(); |
| } |
| } |