Examples of org.apache.commons.betwixt.XMLIntrospector

org.apache.commons.betwixt.XMLIntrospector

XMLIntrospector an introspector of beans to create a XMLBeanInfo instance.

By default, XMLBeanInfo caching is switched on. This means that the first time that a request is made for a XMLBeanInfo for a particular class, the XMLBeanInfo is cached. Later requests for the same class will return the cached value.

Note :

This class makes use of the java.bean.Introspector class, which contains a BeanInfoSearchPath. To make sure betwixt can do his work correctly, this searchpath is completely ignored during processing. The original values will be restored after processing finished
@author James Strachan @author Martin van den Bemt

     * @return descriptor for the singular property class type referenced.
     */
    protected ElementDescriptor getElementDescriptor( ElementDescriptor propertyDescriptor ) {
        Class beanClass = propertyDescriptor.getSingularPropertyType();
        if ( beanClass != null ) {
            XMLIntrospector introspector = getBeanReader().getXMLIntrospector();
            try {
                XMLBeanInfo xmlInfo = introspector.introspect( beanClass );
                return xmlInfo.getElementDescriptor();
                
            } catch (Exception e) {
                log.warn( "Could not introspect class: " + beanClass, e );
            }

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     */
  public XMLIntrospector getXMLIntrospector() {
        // read context is not intended to be used by multiple threads
        // so no need to worry about lazy creation
        if (xmlIntrospector == null) {
            xmlIntrospector = new XMLIntrospector();
        }
    return xmlIntrospector;
  }

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        //XMLIntrospectorHelper.setLog(log);
        
        //log = new SimpleLog("[testReadwithCollectionsInElementRoundTrip:XMLIntrospector]");
        //log.setLevel(SimpleLog.LOG_LEVEL_TRACE);
    
        XMLIntrospector intro = createXMLIntrospector();
        //intro.setLog(log);
        intro.setWrapCollectionsInElement(true);
        
        //log = new SimpleLog("[testReadwithCollectionsInElementRoundTrip:BeanReader]");
        //log.setLevel(SimpleLog.LOG_LEVEL_TRACE);
        
        BeanReader reader = new BeanReader();

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//        BeanRuleSet.setLog(log);
        
//  log = new SimpleLog("[testReadWithoutCollectionsInElementRoundTrip:XMLIntrospector]");
//        log.setLevel(SimpleLog.LOG_LEVEL_TRACE);
 
        XMLIntrospector intro = createXMLIntrospector();
        intro.setWrapCollectionsInElement(false);
//        intro.setLog(log);
//        log = new SimpleLog("[testReadWithoutCollectionsInElementRoundTrip:XMLIntrospectorHelper]");
//        log.setLevel(SimpleLog.LOG_LEVEL_TRACE);
//        XMLIntrospectorHelper.setLog(log);
        BeanReader reader = new BeanReader();

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    }
    /**
     * Set up the XMLIntroSpector
     */
    protected XMLIntrospector createXMLIntrospector() {
        XMLIntrospector introspector = new XMLIntrospector();


        // set elements for attributes to true
        introspector.setAttributesForPrimitives(true);
        introspector.setWrapCollectionsInElement(false);
        
        return introspector;
    }

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    }
    
    public void testIntrospector() throws Exception {
        //SimpleLog log = new SimpleLog("testIntrospector:introspector");
        //log.setLevel(SimpleLog.LOG_LEVEL_TRACE);
        XMLIntrospector introspector = new XMLIntrospector();
        //introspector.setLog(log);
        
        introspector.setAttributesForPrimitives(true);
        
        Object bean = createBean();
        
        XMLBeanInfo info = introspector.introspect( bean );
        
        assertTrue( "Found XMLBeanInfo", info != null );
        
        ElementDescriptor descriptor = info.getElementDescriptor();
        
        assertTrue( "Found root element descriptor", descriptor != null );
        
        AttributeDescriptor[] attributes = descriptor.getAttributeDescriptors();
        
        assertTrue( "Found attributes", attributes != null && attributes.length > 0 );
        
        // test second introspection with caching on
        info = introspector.introspect( bean );
        
        assertTrue( "Found XMLBeanInfo", info != null );
        
        descriptor = info.getElementDescriptor();
        
        assertTrue( "Found root element descriptor", descriptor != null );
        
        attributes = descriptor.getAttributeDescriptors();
        
        assertTrue( "Found attributes", attributes != null && attributes.length > 0 );




        // test introspection with caching off      
        //introspector.setCachingEnabled(false);  
        introspector.setRegistry(new NoCacheRegistry());
        info = introspector.introspect( bean );
        
        assertTrue( "Found XMLBeanInfo", info != null );
        
        descriptor = info.getElementDescriptor();
        
        assertTrue( "Found root element descriptor", descriptor != null );
        
        attributes = descriptor.getAttributeDescriptors();
        
        assertTrue( "Found attributes", attributes != null && attributes.length > 0 );




        // test introspection after flushing cache
//        introspector.setCachingEnabled(true);
        introspector.setRegistry(new DefaultXMLBeanInfoRegistry()); 
        //introspector.flushCache();
        info = introspector.introspect( bean );
        
        assertTrue( "Found XMLBeanInfo", info != null );
        
        descriptor = info.getElementDescriptor();

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        result.setWriteIDs(false);
        return result;
    }


    private XMLIntrospector newXMLIntrospector(NameMapper mapper) {
        XMLIntrospector introspector = new XMLIntrospector();
        introspector.setAttributesForPrimitives(true);
        introspector.setWrapCollectionsInElement(false);
        introspector.setElementNameMapper(mapper);
        return introspector;
    }

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        propertyDescriptors = null;


//        SimpleLog log = new SimpleLog("[testBeanWithBeanInfo:XMLIntrospector]");
//        log.setLevel(SimpleLog.LOG_LEVEL_TRACE);


        XMLIntrospector introspector = new XMLIntrospector();
        introspector.setAttributesForPrimitives(false);
//        introspector.setLog(log);
        
        XMLBeanInfo xmlBeanInfo = introspector.introspect(BeanWithBeanInfoBean.class);
        
        ElementDescriptor[] elementDescriptors = xmlBeanInfo.getElementDescriptor().getElementDescriptors();
        
//        log = new SimpleLog("[testBeanWithBeanInfo]");
//        log.setLevel(SimpleLog.LOG_LEVEL_DEBUG);

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                    parseString(out.toString()));
        }
    }
    
    public void testDefaultClassNormalizer() throws Exception {
        XMLIntrospector introspector = new XMLIntrospector();
        
        FaceImpl face = new FaceImpl();
        XMLBeanInfo info = introspector.introspect( face );
        ElementDescriptor elementDescriptor = info.getElementDescriptor();
    
        AttributeDescriptor[] attributeDescriptor = elementDescriptor.getAttributeDescriptors();      
        ElementDescriptor[] children = elementDescriptor.getElementDescriptors();

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        assertEquals("Expected no attributes", 0, attributeDescriptor.length);
        assertEquals("Expected two elements", 2, children.length);
    }  
    
    public void testClassNormalizer() throws Exception {
        XMLIntrospector introspector = new XMLIntrospector();
        introspector.setClassNormalizer( new ClassNormalizer() {
                
                public Class normalize(Class clazz) {
                    if (IFace.class.isAssignableFrom( clazz )) {
                        return IFace.class;
                    }  
                    return super.normalize( clazz );
                }  
            });
        
        FaceImpl face = new FaceImpl();
        XMLBeanInfo info = introspector.introspect( face );
        ElementDescriptor elementDescriptor = info.getElementDescriptor();
        assertEquals("Expected only itself", 1, elementDescriptor.getElementDescriptors().length);
    
        AttributeDescriptor[] attributeDescriptor = elementDescriptor.getAttributeDescriptors();      
        ElementDescriptor[] children = elementDescriptor.getElementDescriptors();

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