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

        
    /** Test output of bean with mixed content */
    public void testSimpleMixedContent() throws Exception {
        StringWriter out = new StringWriter();
        out.write("<?xml version='1.0' encoding='UTF-8'?>");
        BeanWriter writer = new BeanWriter( out );
        writer.write( new MixedContentOne("Life,", "The Universe And Everything", 42) );
        
        String xml = "<?xml version='1.0' encoding='UTF-8'?><deep-thought alpha='Life,' gamma='42'>"
            + "The Universe And Everything</deep-thought>";
        
        xmlAssertIsomorphicContent(

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        bean.setB("<strong>weak</strong>");
        bean.setC("<strong>weak</strong>");
        
        StringWriter out = new StringWriter();
        out.write("<?xml version='1.0'?>");
        BeanWriter writer = new BeanWriter(out);
        writer.getXMLIntrospector().setAttributesForPrimitives(false);
        writer.write(bean);
        
        String expected = "<?xml version='1.0'?>" +
            "<greek-abc>\n" +
            "<alpha><![CDATA[<strong>weak</strong>]]></alpha>\n" +
            "<beta>&lt;strong&gt;weak&lt;/strong&gt;</beta>\n" +

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        bean.addExample(new ExampleImpl(3, "Dormouse"));
        
        StringWriter out = new StringWriter();
        out.write("<?xml version='1.0' encoding='UTF-8'?>");
        
        BeanWriter writer = new BeanWriter( out );
        writer.getXMLIntrospector().setElementNameMapper(new HyphenatedNameMapper());
        writer.getXMLIntrospector().setWrapCollectionsInElement(false);
        
        writer.write( bean );
        
        String xml = "<?xml version='1.0' encoding='UTF-8'?>"
            + "<example-bean><name>Alice</name>"
            + "<example><id>1</id><name>Mad Hatter</name></example>"
            + "<example><id>2</id><name>March Hare</name></example>"

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        Element element = new Element();
        element.setValue("<greeting>What Ho Jeeves!</greeting>");
        
        StringWriter out = new StringWriter();
        out.write("<?xml version='1.0'?>");
        BeanWriter writer = new BeanWriter(out);
        writer.getXMLIntrospector().setAttributesForPrimitives(false);
        writer.setMixedContentEncodingStrategy(new TestBaseMixedContentEncoding(false));
        writer.write(element);
        
        String expected = "<?xml version='1.0'?><Element>\n<value>&lt;greeting&gt;What Ho Jeeves!&lt;/greeting&gt;</value>\n</Element>\n";
        String xml = out.getBuffer().toString();
         
        assertEquals(expected,xml);

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//        baseLog.setLevel(SimpleLog.LOG_LEVEL_TRACE);
        
        // test output when writing empty elements
        StringWriter out = new StringWriter();
        out.write("<?xml version='1.0'?>");
        BeanWriter writer = new BeanWriter(out);
        writer.setWriteEmptyElements(true);
        writer.setWriteIDs(false);
        writer.write(bean);
//        baseLog.debug("SIMPLE EMPTY");
//        baseLog.debug(out.getBuffer().toString());
        String xml = "<?xml version='1.0'?><AddressBean><street>Pasture Lane</street><city>Bradford</city>"
                    + "<code/><country/></AddressBean>";
//        baseLog.debug(xml);


        xmlAssertIsomorphicContent(parseString(out.getBuffer().toString()),parseString(xml), true);
        
        // test output when not writing empty elements
        out = new StringWriter();
        out.write("<?xml version='1.0'?>");
        writer = new BeanWriter(out);
        writer.setWriteEmptyElements(false);
        writer.setWriteIDs(false);
//        writer.setAbstractBeanWriterLog(log);
        writer.write(bean);
        xml = "<?xml version='1.0'?><AddressBean><street>Pasture Lane</street><city>Bradford</city>"
                    + "</AddressBean>";
//        baseLog.debug("SIMPLE NOT EMPTY");
//        baseLog.debug(out.getBuffer().toString());
        xmlAssertIsomorphicContent(parseString(out.getBuffer().toString()),parseString(xml), true);

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        Element element = new Element();
        element.setValue("<greeting>What Ho Jeeves!</greeting>");
        
        StringWriter out = new StringWriter();
        out.write("<?xml version='1.0'?>");
        BeanWriter writer = new BeanWriter(out);
        writer.getXMLIntrospector().setAttributesForPrimitives(false);
        writer.setMixedContentEncodingStrategy(new TestBaseMixedContentEncoding(true));
        writer.write(element);
        
        String expected = "<?xml version='1.0'?><Element>\n<value><![CDATA[<greeting>What Ho Jeeves!</greeting>]]></value>\n</Element>\n";
        String xml = out.getBuffer().toString();
         
        assertEquals(expected,xml);

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//        baseLog.setLevel(SimpleLog.LOG_LEVEL_TRACE);
    
        // test output when writing empty elements
        StringWriter out = new StringWriter();
        out.write("<?xml version='1.0'?>");
        BeanWriter writer = new BeanWriter(out);
        writer.setWriteEmptyElements(true);
        writer.setWriteIDs(false);
        writer.write(root);
//        baseLog.debug("NESTED EMPTY");
//        baseLog.debug(out.getBuffer().toString());
        String xml = "<?xml version='1.0'?><LoopBean><name>base</name><friend><name/><friend><name/></friend>"
                    + "</friend></LoopBean>";
        xmlAssertIsomorphicContent(parseString(out.getBuffer().toString()),parseString(xml), true);
        
        // test output when not writing empty elements
        out = new StringWriter();
        out.write("<?xml version='1.0'?>");
        writer = new BeanWriter(out);
        writer.setWriteEmptyElements(false);
        writer.setWriteIDs(false);
        writer.write(root);
//        baseLog.debug("NESTED NOT EMPTY");
//        baseLog.debug(out.getBuffer().toString());
        xml = "<?xml version='1.0'?><LoopBean><name>base</name></LoopBean>";
        xmlAssertIsomorphicContent(parseString(out.getBuffer().toString()),parseString(xml), true);

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        bean.addHobby("Watching rugby league");
        bean.addHobby("Havin' it large");
    
        StringWriter out = new StringWriter();
        out.write("<?xml version='1.0'?>");
        BeanWriter writer = new BeanWriter(out);
        writer.setWriteEmptyElements(true);
        writer.setWriteIDs(false);
        writer.write(bean);
        
        String xml = "<?xml version='1.0'?><ArrayBean><name>Rob</name><hobbies>"
         + "<hobby>Hacking open source software</hobby>" 
         + "<hobby>Playing cricket</hobby>" 
         + "<hobby>Watching rugby league</hobby>" 
         + "<hobby>Havin' it large</hobby>"
         +"</hobbies></ArrayBean>";
        xmlAssertIsomorphicContent(
                            parseString(out.getBuffer().toString()),
                            parseString(xml), 
                            true);
                            
        String [] array = {"This", "That", "The Other"};
        out = new StringWriter();
        out.write("<?xml version='1.0'?>");
        writer = new BeanWriter(out);
        writer.setWriteEmptyElements(true);
        writer.setWriteIDs(false);
        writer.write(array);
        
        xml = "<?xml version='1.0'?><Array>"
         + "<String>This</String>" 
         + "<String>That</String>" 
         + "<String>The Other</String>"

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        names.addName(new NameBean(""));
    
        StringWriter out = new StringWriter();
        out.write("<?xml version='1.0'?>");


        BeanWriter writer = new BeanWriter(out);
        
        //SimpleLog log = new SimpleLog("[testListedWriteEmptyElements:AbstractBeanWriter]");
        //log.setLevel(SimpleLog.LOG_LEVEL_TRACE);
        //writer.setAbstractBeanWriterLog(log);
        
        //log = new SimpleLog("[testListedWriteEmptyElements:XMLIntrospector]");
        //log.setLevel(SimpleLog.LOG_LEVEL_TRACE);
        //writer.getXMLIntrospector().setLog(log);
        
        //log = new SimpleLog("[testListedWriteEmptyElements:XMLIntrospectorHelper]");
        //log.setLevel(SimpleLog.LOG_LEVEL_TRACE);
        //XMLIntrospectorHelper.setLog(log);
        
        writer.setWriteEmptyElements(false);
        writer.getXMLIntrospector().setWrapCollectionsInElement(false);
        writer.setWriteIDs(false);
        writer.write("Names", names);
        
        String xml = "<?xml version='1.0'?><Names>"
         + "<name><name>Tom</name></name>" 
         + "<name><name>Dick</name></name>" 
         + "<name><name>Harry</name></name>" 
         +"</Names>";
         
        xmlAssertIsomorphicContent(
                            parseString(out.getBuffer().toString()),
                            parseString(xml), 
                            true);
                            
        out = new StringWriter();
        out.write("<?xml version='1.0'?>");


        writer = new BeanWriter(out);
        writer.setWriteEmptyElements(true);
        writer.getXMLIntrospector().setWrapCollectionsInElement(false);
        writer.setWriteIDs(false);
        writer.write("Names", names);
        
        xml = "<?xml version='1.0'?><Names>"
         + "<name><name>Tom</name></name>" 
         + "<name><name>Dick</name></name>" 
         + "<name><name>Harry</name></name>" 
         + "<name><name/></name>"
         +"</Names>";
         
        xmlAssertIsomorphicContent(
                            parseString(out.getBuffer().toString()),
                            parseString(xml), 
                            true);
                            
        out = new StringWriter();
        out.write("<?xml version='1.0'?>");


        writer = new BeanWriter(out);
        writer.setWriteEmptyElements(true);
        writer.getXMLIntrospector().setWrapCollectionsInElement(true);
        writer.setWriteIDs(false);
        writer.write("Names", names);
        
        xml = "<?xml version='1.0'?><Names><names>"
         + "<name><name>Tom</name></name>" 
         + "<name><name>Dick</name></name>" 
         + "<name><name>Harry</name></name>" 
         + "<name><name/></name></names>"
         +"</Names>";
         
        xmlAssertIsomorphicContent(
                            parseString(out.getBuffer().toString()),
                            parseString(xml), 
                            true);
                            
        out = new StringWriter();
        out.write("<?xml version='1.0'?>");


        writer = new BeanWriter(out);
        writer.setWriteEmptyElements(false);
        writer.getXMLIntrospector().setWrapCollectionsInElement(true);
        writer.setWriteIDs(false);
        writer.write("Names", names);
        
        xml = "<?xml version='1.0'?><Names><names>"
         + "<name><name>Tom</name></name>" 
         + "<name><name>Dick</name></name>" 
         + "<name><name>Harry</name></name>"

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        throws Exception
    {
        // Let's try to write the bean
        StringWriter out = new StringWriter();
        out.write("<?xml version='1.0'?>");
        BeanWriter beanWriter = new BeanWriter(out);
        beanWriter.setXMLIntrospector(createXMLIntrospector());
        beanWriter.setWriteIDs(false);
        beanWriter.enablePrettyPrint();
        
        beanWriter.write(po);
        String xml = "<?xml version='1.0'?><content><printingno>555008805581</printingno>"
                + "<componenttest><compdescription>Text</compdescription></componenttest>"
                + "<componenttest><compdescription>Binding</compdescription></componenttest>"
                + "<componenttest><compdescription>Paper Cover</compdescription>"
                + "</componenttest></content>";

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