Examples of org.apache.commons.digester3.Digester

org.apache.commons.digester3.Digester

A Digester processes an XML input stream by matching a series of element nesting patterns to execute Rules that have been added prior to the start of parsing.

See the Digester Developer Guide for more information.

IMPLEMENTATION NOTE - A single Digester instance may only be used within the context of a single thread at a time, and a call to parse() must be completed before another can be initiated even from the same thread.

A Digester instance should not be used for parsing more than one input document. The problem is that the Digester class has quite a few member variables whose values "evolve" as SAX events are received during a parse. When reusing the Digester instance, all these members must be reset back to their initial states before the second parse begins. The "clear()" method makes a stab at resetting these, but it is actually rather a difficult problem. If you are determined to reuse Digester instances, then at the least you should call the clear() method before each parse, and must call it if the Digester parse terminates due to an exception during a parse.

LEGACY IMPLEMENTATION NOTE - When using the legacy XML schema support (instead of using the {@link Schema} class), a bug in Xerces 2.0.2 prevents the support of XML schema. You need Xerces 2.1/2.3 and up tomake this class work with the legacy XML schema support.

This package was inspired by the XmlMapper class that was part of Tomcat 3.0 and 3.1, but is organized somewhat differently.

    {
        // this method tests the Delegate functionality by capturing all
        // data below the specified pattern, and printing it to stdout.
        // I can't for the moment think how to turn this into a unit test,
        // so this test is disabled.
        Digester digester = new Digester();
        PluginRules rc = new PluginRules();
        digester.setRules( rc );


        DumperRule dr = new DumperRule();
        digester.addRule( "root", dr );


        try
        {
            digester.parse( Utils.getInputStream( this, "test1.xml" ) );
        }
        catch ( Exception e )
        {
            throw e;
        }

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     */
    @Before
    public void setUp()
    {


        digester = new Digester();
        digester.setRules( createMatchingRulesForTest() );


    }

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            "<?xml version='1.0'?>\n" + "<box id='root'>\n" + "  <subBox id='box1'/>\n" + "  <ignoreme/>\n"
                + "  <subBox id='box2'/> <subBox id='box3'/>\n" + "</box>";


        LocationTracker locnTracker = new LocationTracker();


        Digester digester = newLoader( new AbstractRulesModule()
        {


            @Override
            protected void configure()
            {
                forPattern( "box" ).createObject().ofType( Box.class )
                    .then()
                    .setProperties();
                forPattern( "box/subBox" ).createObject().ofType( Box.class )
                    .then()
                    .setProperties()
                    .then()
                    .setNext( "addChild" );
            }


        })
        .setStackAction( locnTracker )
        .newDigester();


        Box root = digester.parse( new StringReader( TEST_XML ) );
        assertNotNull( root );
        List<Box> children = root.getChildren();
        assertEquals( 3, children.size() );
        Box box1 = children.get( 0 );
        Box box2 = children.get( 1 );

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    @Test
    public void testDigesterResolveRelative()
        throws Exception
    {
        Digester digester = new Digester();
        digester.setValidating( true );
        digester.parse( new File( "src/test/resources/org/apache/commons/digester3/document-with-relative-dtd.xml" ) );
    }

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        // now for the tests
        String xml = "<?xml version='1.0' ?><root><element/></root>";


        // test default - which is to propagate the exception
        Digester digester = new Digester();
        digester.addFactoryCreate( "root", new ThrowExceptionCreateRule(), ignoreCreateExceptions );
        try
        {


            digester.parse( new StringReader( xml ) );
            if ( !ignoreCreateExceptions )
            {
                fail( "Exception should be propagated from create rule" );
            }

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    public void testFactoryCreateRule()
        throws Exception
    {


        // test passing object create
        Digester digester = new Digester();
        ObjectCreationFactoryTestImpl factory = new ObjectCreationFactoryTestImpl();
        digester.addFactoryCreate( "root", factory, ignoreCreateExceptions );
        String xml = new String( "<?xml version='1.0' ?><root one='good' two='bad' three='ugly'><element/></root>" );
        digester.parse( new StringReader( xml ) );


        assertEquals( "Object create not called(1)[" + ignoreCreateExceptions + "]", factory.called, true );
        assertEquals( "Attribute not passed (1)[" + ignoreCreateExceptions + "]", factory.attributes.getValue( "one" ),
                      "good" );
        assertEquals( "Attribute not passed (2)[" + ignoreCreateExceptions + "]", factory.attributes.getValue( "two" ),
                      "bad" );
        assertEquals( "Attribute not passed (3)[" + ignoreCreateExceptions + "]", factory.attributes.getValue( "three" ),
                      "ugly" );


        digester = new Digester();
        digester.addFactoryCreate( "root", "org.apache.commons.digester3.ObjectCreationFactoryTestImpl",
                                   ignoreCreateExceptions );
        digester.addSetNext( "root", "add" );
        xml = new String( "<?xml version='1.0' ?><root one='good' two='bad' three='ugly'><element/></root>" );
        List<ObjectCreationFactoryTestImpl> list = new ArrayList<ObjectCreationFactoryTestImpl>();
        digester.push( list );
        digester.parse( new StringReader( xml ) );


        assertEquals( "List should contain only the factory object", list.size(), 1 );
        factory = list.get( 0 );
        assertEquals( "Object create not called(2)[" + ignoreCreateExceptions + "]", factory.called, true );
        assertEquals( "Attribute not passed (4)[" + ignoreCreateExceptions + "]", factory.attributes.getValue( "one" ),
                      "good" );
        assertEquals( "Attribute not passed (5)[" + ignoreCreateExceptions + "]", factory.attributes.getValue( "two" ),
                      "bad" );
        assertEquals( "Attribute not passed (6)[" + ignoreCreateExceptions + "]", factory.attributes.getValue( "three" ),
                      "ugly" );


        digester = new Digester();
        digester.addFactoryCreate( "root", "org.apache.commons.digester3.ObjectCreationFactoryTestImpl", "override",
                                   ignoreCreateExceptions );
        digester.addSetNext( "root", "add" );
        xml = new String( "<?xml version='1.0' ?><root one='good' two='bad' three='ugly'><element/></root>" );
        list = new ArrayList<ObjectCreationFactoryTestImpl>();
        digester.push( list );
        digester.parse( new StringReader( xml ) );


        assertEquals( "List should contain only the factory object", list.size(), 1 );
        factory = list.get( 0 );
        assertEquals( "Object create not called(3)[" + ignoreCreateExceptions + "]", factory.called, true );
        assertEquals( "Attribute not passed (7)[" + ignoreCreateExceptions + "]", factory.attributes.getValue( "one" ),
                      "good" );
        assertEquals( "Attribute not passed (8)[" + ignoreCreateExceptions + "]", factory.attributes.getValue( "two" ),
                      "bad" );
        assertEquals( "Attribute not passed (8)[" + ignoreCreateExceptions + "]", factory.attributes.getValue( "three" ),
                      "ugly" );


        digester = new Digester();
        digester.addFactoryCreate( "root", "org.apache.commons.digester3.ObjectCreationFactoryTestImpl", "override",
                                   ignoreCreateExceptions );
        digester.addSetNext( "root", "add" );
        xml =
            new String( "<?xml version='1.0' ?><root one='good' two='bad' three='ugly' "
                + " override='org.apache.commons.digester3.OtherTestObjectCreationFactory' >" + "<element/></root>" );
        list = new ArrayList<ObjectCreationFactoryTestImpl>();
        digester.push( list );
        digester.parse( new StringReader( xml ) );


        assertEquals( "List should contain only the factory object", list.size(), 1 );
        factory = list.get( 0 );
        assertEquals( "Attribute Override Failed (1)", factory.getClass().getName(),
                      "org.apache.commons.digester3.OtherTestObjectCreationFactory" );
        assertEquals( "Object create not called(4)[" + ignoreCreateExceptions + "]", factory.called, true );
        assertEquals( "Attribute not passed (10)[" + ignoreCreateExceptions + "]", factory.attributes.getValue( "one" ),
                      "good" );
        assertEquals( "Attribute not passed (11)[" + ignoreCreateExceptions + "]", factory.attributes.getValue( "two" ),
                      "bad" );
        assertEquals( "Attribute not passed (12)[" + ignoreCreateExceptions + "]", factory.attributes.getValue( "three" ),
                      "ugly" );


        digester = new Digester();
        digester.addFactoryCreate( "root", ObjectCreationFactoryTestImpl.class, "override", ignoreCreateExceptions );
        digester.addSetNext( "root", "add" );
        xml = new String( "<?xml version='1.0' ?><root one='good' two='bad' three='ugly'><element/></root>" );
        list = new ArrayList<ObjectCreationFactoryTestImpl>();
        digester.push( list );
        digester.parse( new StringReader( xml ) );


        assertEquals( "List should contain only the factory object", list.size(), 1 );
        factory = list.get( 0 );
        assertEquals( "Object create not called(5)[" + ignoreCreateExceptions + "]", factory.called, true );
        assertEquals( "Attribute not passed (13)[" + ignoreCreateExceptions + "]", factory.attributes.getValue( "one" ),
                      "good" );
        assertEquals( "Attribute not passed (14)[" + ignoreCreateExceptions + "]", factory.attributes.getValue( "two" ),
                      "bad" );
        assertEquals( "Attribute not passed (15)[" + ignoreCreateExceptions + "]", factory.attributes.getValue( "three" ),
                      "ugly" );


        digester = new Digester();
        digester.addFactoryCreate( "root", ObjectCreationFactoryTestImpl.class, "override", ignoreCreateExceptions );
        digester.addSetNext( "root", "add" );
        xml =
            new String( "<?xml version='1.0' ?><root one='good' two='bad' three='ugly' "
                + " override='org.apache.commons.digester3.OtherTestObjectCreationFactory' >" + "<element/></root>" );
        list = new ArrayList<ObjectCreationFactoryTestImpl>();
        digester.push( list );
        digester.parse( new StringReader( xml ) );


        assertEquals( "List should contain only the factory object", list.size(), 1 );
        factory = list.get( 0 );
        assertEquals( "Attribute Override Failed (2)", factory.getClass().getName(),
                      "org.apache.commons.digester3.OtherTestObjectCreationFactory" );

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                bindRulesFrom( clazz );
            }


        });


        Digester digester = newLoader(modules).newDigester();
        Object actual = digester.parse(input);


        if (input != null) {
            input.close();
        }

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     */
    @Before
    public void setUp()
    {


        digester = new Digester();


    }

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    {
        // * tests that a rule can declare custom PluginCreateRules
        // that allow it to plug in instances of itself below
        // itself.


        Digester digester = new Digester();
        PluginRules rc = new PluginRules();
        digester.setRules( rc );


        PluginDeclarationRule pdr = new PluginDeclarationRule();
        digester.addRule( "*/plugin", pdr );


        PluginCreateRule pcr = new PluginCreateRule( Widget.class );
        digester.addRule( "root/widget", pcr );
        digester.addSetNext( "root/widget", "addChild" );


        Container root = new Container();
        digester.push( root );


        try
        {
            digester.parse( Utils.getInputStream( this, "test6.xml" ) );
        }
        catch ( Exception e )
        {
            throw e;
        }

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            System.err.println( "usage: pipeline config-file" );
            System.exit( -1 );
        }
        String configFile = args[0];


        Digester digester = new Digester();
        PluginRules rc = new PluginRules();
        digester.setRules( rc );


        digester.addObjectCreate( "pipeline", Pipeline.class );


        digester.addCallMethod( "pipeline/source", "setSource", 1 );
        digester.addCallParam( "pipeline/source", 0, "file" );


        PluginCreateRule pcr = new PluginCreateRule( Transform.class );
        digester.addRule( "pipeline/transform", pcr );
        digester.addSetNext( "pipeline/transform", "setTransform" );


        digester.addCallMethod( "pipeline/destination", "setDest", 1 );
        digester.addCallParam( "pipeline/destination", 0, "file" );


        Pipeline pipeline = null;
        try
        {
            pipeline = digester.parse( configFile );
        }
        catch ( Exception e )
        {
            System.err.println( "oops exception occurred during parse." );
            e.printStackTrace();

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