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

        bean.addLine("\"By thy long grey beard and the glittering eye,");
        bean.addLine("Now wherefore stopp'st thou me?\"");
        
        StringWriter out = new StringWriter();
        out.write("<?xml version='1.0'?>");
        BeanWriter writer = new BeanWriter(out);
        writer.getBindingConfiguration().setMapIDs(false);
        writer.write(bean);
        
        String xml = out.toString();
        xmlAssertIsomorphic(parseString(expected), parseString(xml));
    }

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        StringWriter outputWriter = new StringWriter();


        outputWriter.write("<?xml version=\"1.0\" ?>\n");


        BeanWriter beanWriter = new BeanWriter(outputWriter);
        beanWriter.setEndOfLine("\n");
        beanWriter.enablePrettyPrint();
        beanWriter.setWriteEmptyElements(true);
        beanWriter.getBindingConfiguration().setMapIDs(false);
        beanWriter.getXMLIntrospector().register(new InputSource(new StringReader(MAPPING)));
        beanWriter.setEndOfLine("\n"); //force to \n so expected values match for sure
        beanWriter.write(container);


        String output = outputWriter.toString();


        assertEquals(EXPECTED1, output);

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        StringWriter outputWriter = new StringWriter();


        outputWriter.write("<?xml version=\"1.0\" ?>\n");


        BeanWriter beanWriter = new BeanWriter(outputWriter);
        beanWriter.setEndOfLine("\n");
        beanWriter.enablePrettyPrint();
        beanWriter.setWriteEmptyElements(true);
        beanWriter.getBindingConfiguration().setMapIDs(false);
        beanWriter.getXMLIntrospector().register(new InputSource(new StringReader(MAPPING)));
        beanWriter.setEndOfLine("\n"); //force to \n so expected values match for sure
        beanWriter.write(container);


        String output = outputWriter.toString();


        assertEquals(EXPECTED2, output);

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        StringWriter outputWriter = new StringWriter();


        outputWriter.write("<?xml version=\"1.0\" ?>\n");


        BeanWriter beanWriter = new BeanWriter(outputWriter);
        beanWriter.setEndOfLine("\n");
        beanWriter.enablePrettyPrint();
        beanWriter.setWriteEmptyElements(true);
        beanWriter.getBindingConfiguration().setMapIDs(false);
        beanWriter.getXMLIntrospector().register(new InputSource(new StringReader(MAPPING)));
        beanWriter.setEndOfLine("\n"); //force to \n so expected values match for sure
        beanWriter.write(container);


        String output = outputWriter.toString();


        assertEquals(EXPECTED3, output);

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    }


    public void testSimpleRead() throws Exception {
        StringWriter out = new StringWriter();
        out.write("<?xml version='1.0'?>");
        BeanWriter writer = new BeanWriter(out);
        writer.getBindingConfiguration().setMapIDs(false);
        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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        Animals animals = new Animals();
        animals.addAnimal(new FerretBean("albino", "Lector"));
        animals.addAnimal(new CatBean("Sam", "black"));
        animals.addAnimal(new DogBean("Bobby"));
       
        BeanWriter writer = new BeanWriter(out);
        writer.getXMLIntrospector().getConfiguration()
            .setMappingDerivationStrategy(MappingDerivationStrategy.USE_BIND_TIME_TYPE);
        writer.getXMLIntrospector().getConfiguration()
            .setWrapCollectionsInElement(false);
        writer.getBindingConfiguration().setMapIDs(false);
        writer.write(animals);
        
        String expected = "<?xml version='1.0'?>" +
            "<Animals>" +
            "  <animal>" +
            "    <call>Dook</call><colour>albino</colour>" +

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        Animals animals = new Animals();
        animals.addAnimal(new FerretBean("albino", "Lector"));
        animals.addAnimal(new CatBean("Sam", "black"));
        animals.addAnimal(new DogBean("Bobby"));
       
        BeanWriter writer = new BeanWriter(out);
        writer.getXMLIntrospector().getConfiguration()
            .setMappingDerivationStrategy(MappingDerivationStrategy.USE_INTROSPECTION_TIME_TYPE);
        writer.getXMLIntrospector().getConfiguration()
            .setWrapCollectionsInElement(false);
        writer.getBindingConfiguration().setMapIDs(false);
        writer.write(animals);
        
        String expected = "<?xml version='1.0'?><Animals>" +
            "  <animal><call>Dook</call><latinName>Mustela putoris furo</latinName></animal>" +
            "  <animal><call>Meow</call><latinName>Felis catus</latinName></animal>" +
            "  <animal><call>Woof</call><latinName>Canis familiaris</latinName></animal>" +

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            = new InputSource(
                    new FileReader(getTestFile("src/test/org/apache/commons/betwixt/mapping.xml")));
        
        StringWriter outputWriter = new StringWriter();
        outputWriter.write("<?xml version='1.0' ?>\n");
        BeanWriter beanWriter = new BeanWriter(outputWriter);
            beanWriter.setEndOfLine("\n");
            beanWriter.enablePrettyPrint();
        beanWriter.setWriteEmptyElements(true);
        beanWriter.getXMLIntrospector().register(source);
            beanWriter.setEndOfLine("\n"); //force to ensure matches on expected
        beanWriter.write(partyBean);
        String expectedOut = "<?xml version='1.0' ?>\n" +
                         "  <party id=\"1\">\n" +
                         "    <the-excuse>too late</the-excuse>\n" +
                         "    <location id=\"2\">\n" +
                         "      <street>12312 Here</street>\n" +

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            assertEquals("Second element name", "alpha" , elementDescriptors[1].getPropertyName());
        }
        
        // might as well give test output
        StringWriter out = new StringWriter();
        BeanWriter writer = new BeanWriter(out);
        writer.getBindingConfiguration().setMapIDs(false);
        BeanWithBeanInfoBean bean = new BeanWithBeanInfoBean("alpha value","beta value","gamma value");
        writer.write(bean);
        
        if (alphaFirst) {
        
            xmlAssertIsomorphicContent(
                    parseFile("src/test/org/apache/commons/betwixt/introspection/test-bwbi-output-a.xml"),

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        ListedClassNormalizer classNormalizer = new ListedClassNormalizer();
        classNormalizer.addSubstitution( IFace.class );
        
        StringWriter out = new StringWriter();
        out.write("<?xml version='1.0'?>");
        BeanWriter writer = new BeanWriter( out );
    writer.getBindingConfiguration().setMapIDs(false);
        writer.getXMLIntrospector().getConfiguration().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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