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.

    public void testDefaultPlugins2()
        throws Exception
    {
        // * tests that when there is no default plugin, it is an error
        // not to have one of plugin-class or plugin-id specified
        Digester digester = new Digester();
        PluginRules rc = new PluginRules();
        digester.setRules( rc );


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


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


        Exception exception = null;
        Log oldLog = digester.getLogger();
        try
        {
            digester.setLogger( new NoOpLog() );
            digester.parse( Utils.getInputStream( this, "test2.xml" ) );
        }
        catch ( Exception e )
        {
            exception = e;
        }
        finally
        {
            digester.setLogger( oldLog );
        }


        assertNotNull( exception );
        assertEquals( SAXParseException.class, exception.getClass() );
        assertEquals( PluginInvalidInputException.class, ( (SAXParseException) exception ).getException().getClass() );

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     */
    @Before
    public void setUp()
    {


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


    }

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    public void testDefaultPlugins3()
        throws Exception
    {
        // * tests that the default plugin must implement or extend the
        // plugin base class.
        Digester digester = new Digester();
        PluginRules rc = new PluginRules();
        digester.setRules( rc );


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


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


        Exception exception = null;
        Log oldLog = digester.getLogger();
        try
        {
            digester.setLogger( new NoOpLog() );
            digester.parse( Utils.getInputStream( this, "test2.xml" ) );
        }
        catch ( Exception e )
        {
            exception = e;
        }
        finally
        {
            digester.setLogger( oldLog );
        }


        assertNotNull( exception );
        assertEquals( SAXParseException.class, exception.getClass() );
        assertEquals( PluginConfigurationException.class, ( (SAXParseException) exception ).getException().getClass() );

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                this.body = text;
            }
        }


        TestSubRule tsr = new TestSubRule();
        Digester digester = new Digester();
        digester.addRule( "alpha/beta", tsr );


        // it's not easy to transform dirty harry into the mighty circus - but let's give it a try
        String xml =
            "<?xml version='1.0'?><alpha><beta forname='Dirty' surname='Harry'>Do you feel luck punk?</beta></alpha>";
        InputSource in = new InputSource( new StringReader( xml ) );


        digester.parse( in );


        assertEquals( "Unsubstituted body text", "Do you feel luck punk?", tsr.body );
        assertEquals( "Unsubstituted number of attributes", 2, tsr.attributes.getLength() );
        assertEquals( "Unsubstituted forname attribute value", "Dirty", tsr.attributes.getValue( "forname" ) );
        assertEquals( "Unsubstituted surname attribute value", "Harry", tsr.attributes.getValue( "surname" ) );


        digester.setSubstitutor( new Substitutor()
        {
            @Override
            public Attributes substitute( Attributes attributes )
            {
                AttributesImpl results = new AttributesImpl();
                results.addAttribute( "", "python", "python", "CDATA", "Cleese" );
                return results;
            }


            @Override
            public String substitute( String bodyText )
            {
                return "And now for something completely different...";
            }
        } );


        // now transform into the full monty
        in = new InputSource( new StringReader( xml ) );
        digester.parse( in );


        assertEquals( "Substituted body text", "And now for something completely different...", tsr.body );
        assertEquals( "Substituted number of attributes", 1, tsr.attributes.getLength() );
        assertEquals( "Substituted python attribute value", "Cleese", tsr.attributes.getValue( "", "python" ) );
    }

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    public void testNamedStackPushPeekPop()
        throws Exception
    {
        BigDecimal archimedesAveragePi = new BigDecimal( "3.1418" );
        String testStackName = "org.apache.commons.digester3.tests.testNamedStackPushPeekPop";
        Digester digester = new Digester();
        assertTrue( "Stack starts empty:", digester.isEmpty( testStackName ) );
        digester.push( testStackName, archimedesAveragePi );
        assertEquals( "Peeked value:", archimedesAveragePi, digester.peek( testStackName ) );
        assertEquals( "Popped value:", archimedesAveragePi, digester.pop( testStackName ) );
        assertTrue( "Stack ends empty:", digester.isEmpty( testStackName ) );


        digester.push( testStackName, "1" );
        digester.push( testStackName, "2" );
        digester.push( testStackName, "3" );


        assertEquals( "Peek#1", "1", digester.peek( testStackName, 2 ) );
        assertEquals( "Peek#2", "2", digester.peek( testStackName, 1 ) );
        assertEquals( "Peek#3", "3", digester.peek( testStackName, 0 ) );
        assertEquals( "Peek#3a", "3", digester.peek( testStackName ) );


        try
        {
            // peek beyond stack
            digester.peek( testStackName, 3 );
            fail( "Peek#4 failed to throw an exception." );
        }
        catch ( EmptyStackException ex )
        {
            // ok, expected
        }


        try
        {
            // peek a nonexistent named stack
            digester.peek( "no.such.stack", 0 );
            fail( "Peeking a non-existent stack failed to throw an exception." );
        }
        catch ( EmptyStackException ex )
        {
            // ok, expected

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    @Test
    public void testNamedIndependence()
    {
        String testStackOneName = "org.apache.commons.digester3.tests.testNamedIndependenceOne";
        String testStackTwoName = "org.apache.commons.digester3.tests.testNamedIndependenceTwo";
        Digester digester = new Digester();
        digester.push( testStackOneName, "Tweedledum" );
        digester.push( testStackTwoName, "Tweedledee" );
        assertEquals( "Popped value one:", "Tweedledum", digester.pop( testStackOneName ) );
        assertEquals( "Popped value two:", "Tweedledee", digester.pop( testStackTwoName ) );
    }

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    /** Tests popping named stack not yet pushed */
    @Test
    public void testPopNamedStackNotPushed()
    {
        String testStackName = "org.apache.commons.digester3.tests.testPopNamedStackNotPushed";
        Digester digester = new Digester();
        try
        {


            digester.pop( testStackName );
            fail( "Expected an EmptyStackException" );


        }
        catch ( EmptyStackException e )
        {
            // expected
        }


        try
        {


            digester.peek( testStackName );
            fail( "Expected an EmptyStackException" );


        }
        catch ( EmptyStackException e )
        {

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    /** Tests for isEmpty */
    @Test
    public void testNamedStackIsEmpty()
    {
        String testStackName = "org.apache.commons.digester3.tests.testNamedStackIsEmpty";
        Digester digester = new Digester();
        assertTrue( "A named stack that has no object pushed onto it yet should be empty",
                    digester.isEmpty( testStackName ) );


        digester.push( testStackName, "Some test value" );
        assertFalse( "A named stack that has an object pushed onto it should be not empty",
                     digester.isEmpty( testStackName ) );


        digester.peek( testStackName );
        assertFalse( "Peek should not effect whether the stack is empty", digester.isEmpty( testStackName ) );


        digester.pop( testStackName );
        assertTrue( "A named stack that has it's last object popped is empty", digester.isEmpty( testStackName ) );
    }

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     */
    @Test
    public void testGetRoot()
        throws Exception
    {
        Digester digester = new Digester();
        digester.addRule( "root", new ObjectCreateRule( TestBean.class ) );


        String xml = "<root/>";
        InputSource in = new InputSource( new StringReader( xml ) );


        digester.parse( in );


        Object root = digester.getRoot();
        assertNotNull( "root object not retrieved", root );
        assertTrue( "root object not a TestRule instance", ( root instanceof TestBean ) );
    }

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        Object obj4 = new String( "replpush.obj4" );


        Object obj8 = new String( "obj8" );
        Object obj9 = new String( "obj9" );


        Digester d = new Digester();
        d.setStackAction( action );


        assertEquals( 0, action.events.size() );
        d.push( obj1 );
        d.push( obj2 );
        d.push( obj3 );
        d.push( obj4 );


        assertNotNull( d.peek( 0 ) );
        // for obj4, a copy should have been pushed
        assertNotSame( obj4, d.peek( 0 ) );
        assertEquals( obj4, d.peek( 0 ) );
        // for obj3, replacement only occurs on pop
        assertSame( obj3, d.peek( 1 ) );
        assertSame( obj2, d.peek( 2 ) );
        assertSame( obj1, d.peek( 3 ) );


        Object obj4a = d.pop();
        Object obj3a = d.pop();
        Object obj2a = d.pop();
        Object obj1a = d.pop();


        assertFalse( obj4 == obj4a );
        assertEquals( obj4, obj4a );
        assertFalse( obj3 == obj4a );
        assertEquals( obj3, obj3a );
        assertSame( obj2, obj2a );
        assertSame( obj1, obj1a );


        d.push( "stack1", obj8 );
        d.push( "stack1", obj9 );
        Object obj9a = d.pop( "stack1" );
        Object obj8a = d.pop( "stack1" );


        assertSame( obj8, obj8a );
        assertSame( obj9, obj9a );


        assertEquals( 12, action.events.size() );

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