1 /*
   2  * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package com.sun.xml.internal.bind.v2.runtime.output;
  27 
  28 import java.io.IOException;

  29 import java.lang.reflect.Constructor;
  30 
  31 import javax.xml.stream.XMLStreamException;
  32 import javax.xml.stream.XMLStreamWriter;
  33 

  34 import com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl;
  35 import com.sun.xml.internal.bind.v2.runtime.XMLSerializer;
  36 
  37 import com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl;
  38 import org.xml.sax.SAXException;
  39 
  40 /**
  41  * {@link XmlOutput} that writes to StAX {@link XMLStreamWriter}.
  42  * <p>
  43  * TODO:
  44  * Finding the optimized FI implementations is a bit hacky and not very
  45  * extensible. Can we use the service provider mechanism in general for
  46  * concrete implementations of XmlOutputAbstractImpl.
  47  *
  48  * @author Kohsuke Kawaguchi
  49  */
  50 public class XMLStreamWriterOutput extends XmlOutputAbstractImpl {
  51 
  52     /**
  53      * Creates a new {@link XmlOutput} from a {@link XMLStreamWriter}.
  54      * This method recognizes an FI StAX writer.
  55      */
  56     public static XmlOutput create(XMLStreamWriter out, JAXBContextImpl context) {
  57         // try optimized path
  58         final Class writerClass = out.getClass();
  59         if (writerClass==FI_STAX_WRITER_CLASS) {
  60             try {
  61                 return FI_OUTPUT_CTOR.newInstance(out, context);
  62             } catch (Exception e) {
  63             }
  64         }
  65         if (STAXEX_WRITER_CLASS!=null && STAXEX_WRITER_CLASS.isAssignableFrom(writerClass)) {
  66             try {
  67                 return STAXEX_OUTPUT_CTOR.newInstance(out);
  68             } catch (Exception e) {
  69             }
  70         }
  71 



  72         // otherwise the normal writer.
  73         return new XMLStreamWriterOutput(out);
  74     }
  75 
  76 
  77     private final XMLStreamWriter out;
  78 




  79     protected final char[] buf = new char[256];
  80 
  81     protected XMLStreamWriterOutput(XMLStreamWriter out) {
  82         this.out = out;


  83     }
  84 
  85     // not called if we are generating fragments
  86     @Override
  87     public void startDocument(XMLSerializer serializer, boolean fragment, int[] nsUriIndex2prefixIndex, NamespaceContextImpl nsContext) throws IOException, SAXException, XMLStreamException {
  88         super.startDocument(serializer, fragment,nsUriIndex2prefixIndex,nsContext);
  89         if(!fragment)
  90             out.writeStartDocument();
  91     }
  92 
  93     @Override
  94     public void endDocument(boolean fragment) throws IOException, SAXException, XMLStreamException {
  95         if(!fragment) {
  96             out.writeEndDocument();
  97             out.flush();
  98         }
  99         super.endDocument(fragment);
 100     }
 101 
 102     public void beginStartTag(int prefix, String localName) throws IOException, XMLStreamException {
 103         out.writeStartElement(
 104             nsContext.getPrefix(prefix),
 105             localName,
 106             nsContext.getNamespaceURI(prefix));
 107 
 108         NamespaceContextImpl.Element nse = nsContext.getCurrent();
 109         if(nse.count()>0) {
 110             for( int i=nse.count()-1; i>=0; i-- ) {
 111                 String uri = nse.getNsUri(i);
 112                 if(uri.length()==0 && nse.getBase()==1)
 113                     continue;   // no point in definint xmlns='' on the root
 114                 out.writeNamespace(nse.getPrefix(i),uri);
 115             }
 116         }
 117     }
 118 
 119     public void attribute(int prefix, String localName, String value) throws IOException, XMLStreamException {
 120         if(prefix==-1)
 121             out.writeAttribute(localName,value);
 122         else
 123             out.writeAttribute(
 124                     nsContext.getPrefix(prefix),
 125                     nsContext.getNamespaceURI(prefix),
 126                     localName, value);
 127     }
 128 
 129     public void endStartTag() throws IOException, SAXException {
 130         // noop
 131     }
 132 
 133     public void endTag(int prefix, String localName) throws IOException, SAXException, XMLStreamException {
 134         out.writeEndElement();
 135     }
 136 
 137     public void text(String value, boolean needsSeparatingWhitespace) throws IOException, SAXException, XMLStreamException {
 138         if(needsSeparatingWhitespace)
 139             out.writeCharacters(" ");
 140         out.writeCharacters(value);
 141     }
 142 
 143     public void text(Pcdata value, boolean needsSeparatingWhitespace) throws IOException, SAXException, XMLStreamException {
 144         if(needsSeparatingWhitespace)
 145             out.writeCharacters(" ");
 146 
 147         int len = value.length();
 148         if(len <buf.length) {
 149             value.writeTo(buf,0);
 150             out.writeCharacters(buf,0,len);
 151         } else {
 152             out.writeCharacters(value.toString());
 153         }
 154     }
 155 
 156     /**
 157      * Reference to FI's XMLStreamWriter class, if FI can be loaded.
 158      */
 159     private static final Class FI_STAX_WRITER_CLASS = initFIStAXWriterClass();
 160     private static final Constructor<? extends XmlOutput> FI_OUTPUT_CTOR = initFastInfosetOutputClass();
 161 
 162     private static Class initFIStAXWriterClass() {
 163         try {
 164             Class<?> llfisw = Class.forName("com.sun.xml.internal.org.jvnet.fastinfoset.stax.LowLevelFastInfosetStreamWriter");
 165             Class<?> sds = Class.forName("com.sun.xml.internal.fastinfoset.stax.StAXDocumentSerializer");
 166             // Check if StAXDocumentSerializer implements LowLevelFastInfosetStreamWriter
 167             if (llfisw.isAssignableFrom(sds))
 168                 return sds;
 169             else
 170                 return null;
 171         } catch (Throwable e) {
 172             return null;
 173         }
 174     }
 175 
 176     private static Constructor<? extends XmlOutput> initFastInfosetOutputClass() {
 177         try {
 178             if (FI_STAX_WRITER_CLASS == null)
 179                 return null;
 180             Class c = Class.forName("com.sun.xml.internal.bind.v2.runtime.output.FastInfosetStreamWriterOutput");
 181             return c.getConstructor(FI_STAX_WRITER_CLASS, JAXBContextImpl.class);
 182         } catch (Throwable e) {
 183             return null;
 184         }
 185     }
 186 
 187     //
 188     // StAX-ex
 189     //
 190     private static final Class STAXEX_WRITER_CLASS = initStAXExWriterClass();
 191     private static final Constructor<? extends XmlOutput> STAXEX_OUTPUT_CTOR = initStAXExOutputClass();
 192 
 193     private static Class initStAXExWriterClass() {
 194         try {
 195             return Class.forName("com.sun.xml.internal.org.jvnet.staxex.XMLStreamWriterEx");
 196         } catch (Throwable e) {
 197             return null;
 198         }
 199     }
 200 
 201     private static Constructor<? extends XmlOutput> initStAXExOutputClass() {
 202         try {
 203             Class c = Class.forName("com.sun.xml.internal.bind.v2.runtime.output.StAXExStreamWriterOutput");
 204             return c.getConstructor(STAXEX_WRITER_CLASS);
 205         } catch (Throwable e) {
 206             return null;
 207         }
 208     }
 209 













































































 210 }
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