Examples of org.apache.commons.betwixt.io.BeanWriter

org.apache.commons.betwixt.io.BeanWriter

BeanWriter outputs beans as XML to an io stream.

The output for each bean is an xml fragment (rather than a well-formed xml-document). This allows bean representations to be appended to a document by writing each in turn to the stream. So to create a well formed xml document, you'll need to write the prolog to the stream first. If you append more than one bean to the stream, then you'll need to add a wrapping root element as well.
The line ending to be used is set by {@link #setEndOfLine}.
The output can be formatted (with whitespace) for easy reading by calling {@link #enablePrettyPrint}. The output will be indented. The indent string used is set by {@link #setIndent}.
Bean graphs can sometimes contain cycles. Care must be taken when serializing cyclic bean graphs since this can lead to infinite recursion. The approach taken by BeanWriter is to automatically assign an ID attribute value to beans. When a cycle is encountered, an element is written that has the IDREF attribute set to the id assigned earlier.
The names of the ID and IDREF attributes used can be customized by the XMLBeanInfo. The id's used can also be customized by the user via IDGenerator subclasses. The implementation used can be set by the IdGenerator property. BeanWriter defaults to using SequentialIDGenerator which supplies id values in numeric sequence.
If generated ID attribute values are not acceptable in the output, then this can be disabled by setting the WriteIDs property to false. If a cyclic reference is encountered in this case then a CyclicReferenceException will be thrown. When the WriteIDs property is set to false, it is recommended that this exception is caught by the caller. @author James Strachan @author Martin van den Bemt

        ListedClassNormalizer classNormalizer = new ListedClassNormalizer();
        classNormalizer.addSubstitution( IFace.class );
        
        StringWriter out = new StringWriter();
        out.write("<?xml version='1.0'?>");
        BeanWriter writer = new BeanWriter( out );
        writer.getXMLIntrospector().setClassNormalizer( classNormalizer );
        FaceImpl bean = new FaceImpl();
        bean.setName("Old Tom Cobbly");
        writer.write(bean);
        
        String xml="<?xml version='1.0'?><IFace><name>Old Tom Cobbly</name></IFace>";
        xmlAssertIsomorphicContent(
                            parseString(out.getBuffer().toString()),
                            parseString(xml),

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                            true);
    }
    
    public void testBeanWriterWorksWithAnAddMethodAndACollection() throws Exception {


        BeanWriter bw = new BeanWriter();
        try {
            bw.write(new BeanWithAddMethod());
        } catch (IllegalArgumentException e) {
            fail("BeanWriter fails when a method is just called add(<type>) and there is also a collection");
        }
    }

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        // Betwixt just writes out the bean as a fragment
        // we want well-formed xml, we need to add the prolog
        writer.write(XML_PROLOG);


        // Create a BeanWriter which writes to our prepared stream
        BeanWriter beanWriter = new BeanWriter(writer);


        // Configure betwixt
        // For more details see java docs or later in the main documentation
        beanWriter.getXMLIntrospector().setAttributesForPrimitives(true);
        beanWriter.setWriteIDs(false);
        beanWriter.enablePrettyPrint();


        // Write example bean as base element 'person'
        beanWriter.write("message", msg);
        beanWriter.flush();


        return writer.toString();
    }

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        elements.addElement(new Element("a"));
        elements.addElement(new Element("b"));
        elements.addElement(new Element("c"));


        StringWriter out = new StringWriter();
        BeanWriter writer = newBeanWriter(out, mapper);
        writer.setWriteEmptyElements( true );
        writer.write(elements);
        writer.flush();
        
        String xmlOut = out.toString();
        
//        testLog.debug(xmlOut);

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        dynasaur.set("isRaptor", Boolean.TRUE);
        dynasaur.set("Period", "Jurassic");
        
        StringWriter out = new StringWriter();
        out.write("<?xml version='1.0'?>");
        BeanWriter writer = new BeanWriter(out);
        writer.getXMLIntrospector().setElementNameMapper(new DecapitalizeNameMapper());
        writer.write(dynasaur);
        
        String xml = "<?xml version='1.0'?><dynasaur><species>Allosaurus</species>"
            + "<isRaptor>true</isRaptor><period>Jurassic</period></dynasaur>";
        
        xmlAssertIsomorphicContent(

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    private BeanWriter newBeanWriter(Writer writer, NameMapper mapper) {
//        SimpleLog log = new SimpleLog("[TestElementsAlt:BeanWriter]");
//        log.setLevel(SimpleLog.LOG_LEVEL_TRACE);
        
        BeanWriter result = new BeanWriter(writer);
        result.setWriteEmptyElements( true );
//        result.setLog(log);
        
//        log = new SimpleLog("[TestElementsAlt:AbstractBeanWriter]");
//        log.setLevel(SimpleLog.LOG_LEVEL_TRACE);
//        result.setAbstractBeanWriterLog(log);
        
        result.setXMLIntrospector(newXMLIntrospector(mapper));
        result.enablePrettyPrint();
        result.setWriteIDs(false);
        return result;
    }

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    public void testOverrideWithDotBetwixt() throws Exception {
        DynaWithDotBetwixt bean = new DynaWithDotBetwixt("Tweedledum","Tweedledee");
        StringWriter out = new StringWriter();
        out.write("<?xml version='1.0'?>");
        BeanWriter writer = new BeanWriter(out);
        writer.getXMLIntrospector().setElementNameMapper(new DecapitalizeNameMapper());
        writer.write("bean", bean);
        
        String xml = "<?xml version='1.0'?><bean><ndp>Tweedledum</ndp></bean>";
        xmlAssertIsomorphicContent(  
                            "Test write dyna beans with dt betwixt",
                            parseString(xml),

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        write( bean );
    }
        
    public void write(Object bean) throws Exception {
        BeanWriter writer = new BeanWriter();
        writer.getXMLIntrospector().setAttributesForPrimitives(false);
        writer.enablePrettyPrint();
        writer.write( bean );
    }

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     * retrieved bean
     */
    private void write(Object bean, Writer out, boolean wrapCollectionsInElement)
    throws Exception
    {
        BeanWriter writer = new BeanWriter(out);
        writer.setWriteEmptyElements( true );
        writer.setXMLIntrospector(createXMLIntrospector());
        // specifies weather to use collection elements or not.
        writer.getXMLIntrospector().setWrapCollectionsInElement(wrapCollectionsInElement);
        // we don't want to write Id attributes to every element
        // we just want our opbject model written nothing more..
        writer.setWriteIDs(false);
        // the source has 2 spaces indention and \n as line seperator.
        writer.setIndent("  ");
        writer.setEndOfLine("\n");
        writer.write(bean);
    }

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    }


    public void testSimpleRead() throws Exception {
        StringWriter out = new StringWriter();
        out.write("<?xml version='1.0'?>");
        BeanWriter writer = new BeanWriter(out);
        IDBean bean = new IDBean("alpha","one");
        bean.addChild(new IDBean("beta","two"));
        bean.addChild(new IDBean("gamma","three"));
        writer.write(bean);
        
        String xml = "<IDBean><name>one</name><children><child><name>two</name><children/>"
                + "<id>beta</id></child><child><name>three</name><children/>"
                + "<id>gamma</id></child></children><id>alpha</id></IDBean>";

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