Examples of com.google.gdata.util.common.xml.XmlWriter

Package com.google.gdata.util.common.xml

Examples of com.google.gdata.util.common.xml.XmlWriter

com.google.gdata.util.common.xml.XmlWriter
Implements a simple XML writer on top of java.io.PrintWriter. This implementation can be conveniently used to generate XML responses in servlets.
The XmlWriter class exposes a number of protected methods that enable it to be subclassed for the purposes of customizing its output. See {@link com.google.javascript.util.JsonWriter} for an example.
Optional Behaviors
There are several behaviors of this class that are optionally available. These features are enabled by passing a {@code Set
}to the constructor:
```
new XmlWriter(sw, EnumSet.of(WriterFlags.WRITE_HEADER, WriterFlags.EXPAND_EMPTY, WriterFlags.PRETTY_PRINT), null)
```
The caller can supply any of the values enumerated in {@link XmlWriter.WriterFlags}, or none. Once a feature has been enabled in the constructor, it cannot be turned off.
Including XML Header
The {@code WRITE_HEADER} flags causes {@code XmlWriter} to emit an XMLheader at the beginning of the XML document:
```
<?xml version='1.0'?>
```
Expanding Empty Elements
The {@code EXPAND_EMPTY} flags causes {@code XmlWriter} to emit "expanded"empty elements (elements consisting of distinct begin and end tags):
```
 <foo> <wee really="yeah"></wee> </foo>
```
Pretty Printing

The {@code PRETTY_PRINT} flag enables pretty printing. This featureformats the XML output with using new lines and tab characters:
```
 <foo> <bar> <wee really="yeah"/> </bar> </foo>
```
Caveats
Elements containing mixed content (i.e. both text children and full-fledged elements) will not generally be formatted correctly. If your XML document contains mixed content, you may not want to use pretty printing:
Will produce wonky formatting:
```
 w.startElement(null, "txt", null, null); w.simpleElement(null, "fooey", null, null); w.characters("Kleenex"); w.endElement(null, "txt");
```
```
 <txt> <fooey/>Kleenex </txt>
```
You can ensure correct formatting of mixed content in your document by using the {@link #innerXml(String)} method to write raw XML.
Correctly formatted:
```
 w.startElement(null, "txt", null, null); w.innerXml("<fooey/>"); w.characters("Kleenex"); w.endElement(null, "txt");
```
```
 <txt><fooey/>Kleenex</txt>
```

        StringWriter stringWriter = new StringWriter();
        ExtensionProfile profile = this.applyAble.getServiceConfig()
                .getExtensionProfile();
        if (profile == null)
            throw new IllegalStateException("ExtensionProfile is not set");
        XmlWriter writer = new XmlWriter(stringWriter);
        this.applyAble.generateAtom(writer, profile);
        DocumentBuilder builder = DocumentBuilderFactory.newInstance()
                .newDocumentBuilder();
        return builder.parse(new InputSource(new StringReader(stringWriter
                .toString())));

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        return doc;
    }


    private String buildContent() throws IOException { 
        StringWriter writer = new StringWriter(); 
        XmlWriter xmlWriter = new XmlWriter(writer, INTERNAL_ENCODING); 
        this.feed.generateAtom(xmlWriter,this.config.getExtensionProfile()); 
        return writer.toString(); 
    }

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                if(template == null){
                    sendNotAvailable(response);
                    return;
                }
                StringWriter writer = new StringWriter();
                XmlWriter xmlWriter = new XmlWriter(writer);
                feed.generateAtom(xmlWriter,this.service.getExtensionProfile());
                try {
                    writeHtml(template,response.getWriter(),writer);
                } catch (TransformerException e) {
                 LOG.error("Can not transform feed for service "+this.service.getName(),e);

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                if(template == null){
                    sendNotAvailable(response);
                    return;
                }
                StringWriter writer = new StringWriter();
                XmlWriter xmlWriter = new XmlWriter(writer);
                entry.generateAtom(xmlWriter,this.service.getExtensionProfile());
                try {
                    writeHtml(template,response.getWriter(),writer);
                } catch (TransformerException e) {
                 LOG.error("Can not transform feed for service "+this.service.getName(),e);

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                this.encoding = encoding;
                
            }
            @Override
            void generateOutputFormat(final BaseFeed feed, final HttpServletResponse response) throws IOException {
                XmlWriter writer = null;
                try{
                 writer = createWriter(response.getWriter());
                if (this.format == OutputFormat.ATOM) {
                    response.setContentType(XMLMIME_ATOM);
                    feed.generateAtom(writer, this.service.getExtensionProfile());
                } else {
                    response.setContentType(XMLMIME_RSS);
                    feed.generateRss(writer, this.service.getExtensionProfile());
                }
                }finally{
                    if(writer != null)
                        writer.close();
                }
            }

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                }
            }


            @Override
            void generateOutputFormat(final BaseEntry entry, final HttpServletResponse response) throws IOException {
                XmlWriter writer = null;
                try{
                 writer = createWriter(response.getWriter());
                if (this.format == OutputFormat.ATOM) {
                    response.setContentType(XMLMIME_ATOM);
                    entry.generateAtom(writer, this.service.getExtensionProfile());
                } else {
                    response.setContentType(XMLMIME_RSS);
                    entry.generateRss(writer, this.service.getExtensionProfile());
                }
                }finally{
                    if(writer != null)
                        writer.close();
                }
            }

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                    if(writer != null)
                        writer.close();
                }
            }
            private XmlWriter createWriter(final Writer target) throws IOException {
                XmlWriter writer = new XmlWriter(target, this.encoding);
                // set the default namespace to Atom if Atom is the response format
                if (this.format == OutputFormat.ATOM)
                    writer.setDefaultNamespace(DEFAULT_NAMESPACE);
                return writer;
            }

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        writeTimeStamp(wrapper.getTimestamp().toString(),writer);
        if(!wrapper.getOperation().equals(StorageOperation.DELETE)){
        writeService(wrapper,writer);
            writer.write(META_DATA_ENTRY_SEPARATOR);
            BaseEntry entry = wrapper.getEntry();
            XmlWriter xmlWriter = new XmlWriter(writer);
            entry.generateAtom(xmlWriter,wrapper.getConfigurator().getExtensionProfile());
        }
        writer.write(META_DATA_ENTRY_SEPARATOR);
        writer.write(STORAGE_OPERATION_SEPARATOR);
        writer.write(META_DATA_ENTRY_SEPARATOR);

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   * @throws Exception if error in retrieving feed
   */
  private void retrieveFeed(PrintStream out)
      throws Exception {
    PrintWriter writer = new PrintWriter(out);
    XmlWriter xmlWriter = new XmlWriter(writer);
    CodeSearchFeed myFeed =
      codesearchService.getFeed(privateFeedUrl, CodeSearchFeed.class);
    out.println("Retrieved feed: ");
    out.println("Title: " + myFeed.getTitle().getPlainText());
    out.println("Entries: " + myFeed.getEntries().size());

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  }


  /** Pretty-print a feed. */
  private static void pp(GoogleService service, BaseFeed feed, Writer w)
      throws IOException {
    XmlWriter xw = new XmlWriter(w, XML_PP, null);
    ExtensionProfile extProfile = service.getExtensionProfile();
    feed.generateAtom(xw, extProfile);
    xw.flush();
    w.write("\n");
    w.flush();
  }

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Examples of com.google.gdata.util.common.xml.XmlWriter

Optional Behaviors

Including XML Header

Expanding Empty Elements

Pretty Printing

Caveats

Related Classes of com.google.gdata.util.common.xml.XmlWriter