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


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


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


        return introspector;
    }

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     *
     * @return TODO: DOCUMENT ME!
     */
    protected XMLIntrospector createXMLIntrospector()
    {
        XMLIntrospector introspector = new XMLIntrospector();


        // set elements for attributes to true
        introspector.getConfiguration().setAttributesForPrimitives(false);


        // wrap collections in an XML element
        //introspector.setWrapCollectionsInElement(true);
        // turn bean elements first letter into lower case
        introspector.getConfiguration().setElementNameMapper(new DecapitalizeNameMapper());
        introspector.getConfiguration().setAttributeNameMapper(new DecapitalizeNameMapper());


        introspector.getConfiguration().setPluralStemmer(new DefaultPluralStemmer());


        return introspector;
    }

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     *
     * @return introspector
     */
    private XMLIntrospector createXMLIntrospector()
    {
        XMLIntrospector introspector = new XMLIntrospector();


        // set elements for attributes to true
        introspector.getConfiguration().setAttributesForPrimitives(false);


        // wrap collections in an XML element
        //introspector.setWrapCollectionsInElement(true);
        // turn bean elements first letter into lower case
        introspector.getConfiguration().setElementNameMapper(new DecapitalizeNameMapper());
        introspector.getConfiguration().setAttributeNameMapper(new DecapitalizeNameMapper());


        introspector.getConfiguration().setPluralStemmer(new DefaultPluralStemmer());


        return introspector;
    }

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        if ( var == null ) {
            throw new MissingAttributeException( "var" );
        }
        invokeBody(output);        
        
        XMLIntrospector introspector = getIntrospector();
        
        context.setVariable( var, introspector );
        
        // now lets clear this introspector so that its recreated again next time
        this.introspector = null;

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    /**
     * Factory method to create a new XMLIntrospector
     */
    protected XMLIntrospector createIntrospector() {
        return new XMLIntrospector();
    }

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    /**
     * @return the introspector to be used, lazily creating one if required.
     */
    public XMLIntrospector getIntrospector() {
        if (introspector == null) {
            introspector = new XMLIntrospector();
        }
        return introspector;
    }

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     * @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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        // simple test this one
        // a problem was reported when introspecting classes with 'add' properties
        // when using the HyphenatedNameMapper
        // basically, the test is that no exception is thrown
        //
        XMLIntrospector introspector = new XMLIntrospector();
        introspector.getConfiguration().setElementNameMapper(new HyphenatedNameMapper());
        introspector.introspect(new ArrayList());
    }

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     * / Turbine projects. Maybe a static helper method - question is what to
     * call it???
     */
    protected XMLIntrospector createXMLIntrospector()
    {
        XMLIntrospector introspector = new XMLIntrospector();


        // set elements for attributes to true
        introspector.getConfiguration().setAttributesForPrimitives(false);


        // wrap collections in an XML element
        introspector.getConfiguration().setWrapCollectionsInElement(false);


        // turn bean elements first letter into lower case
        introspector.getConfiguration().setElementNameMapper( new DecapitalizeNameMapper() );


        // Set default plural stemmer.
        introspector.getConfiguration().setPluralStemmer( new DefaultPluralStemmer() );


        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.getConfiguration().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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