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.

     * 
     * @return a Digester with rules and variable substitutor
     */
    private Digester createDigesterThatCanDoAnt()
    {
        Digester digester = new Digester();


        MultiVariableExpander expander = new MultiVariableExpander();
        expander.addSource( "$", mutableSource );
        digester.setSubstitutor( new VariableSubstitutor( expander ) );


        int useRootObj = -1;
        Class<?>[] callerArgTypes = new Class[] { String.class, String.class };
        CallMethodRule caller = new CallMethodRule( useRootObj, "addProperty", callerArgTypes.length, callerArgTypes );
        digester.addRule( "root/property", caller );
        digester.addCallParam( "root/property", 0, "name" );
        digester.addCallParam( "root/property", 1, "value" );


        digester.addObjectCreate( "root/bean", SimpleTestBean.class );
        digester.addSetProperties( "root/bean" );
        digester.addSetNext( "root/bean", "addSimpleTestBean" );
        return digester;
    }

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        throws SAXException, IOException
    {


        String xml = "<root alpha='${attr1}' beta='var{attr2}'/>";
        StringReader input = new StringReader( xml );
        Digester digester = new Digester();


        // Configure the digester as required
        digester.addObjectCreate( "root", SimpleTestBean.class );
        digester.addSetProperties( "root" );


        // Parse our test input.
        SimpleTestBean root = digester.parse( input );


        assertNotNull( "Digester returned no object", root );


        assertEquals( "${attr1}", root.getAlpha() );
        assertEquals( "var{attr2}", root.getBeta() );

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        throws SAXException, IOException
    {


        String xml = "<root alpha='${attr1}' beta='var{attr2}'/>";
        StringReader input = new StringReader( xml );
        Digester digester = new Digester();


        // Configure the digester as required
        MultiVariableExpander expander = new MultiVariableExpander();
        digester.setSubstitutor( new VariableSubstitutor( expander ) );
        digester.addObjectCreate( "root", SimpleTestBean.class );
        digester.addSetProperties( "root" );


        // Parse our test input.
        SimpleTestBean root = digester.parse( input );


        assertNotNull( "Digester returned no object", root );


        assertEquals( "${attr1}", root.getAlpha() );
        assertEquals( "var{attr2}", root.getBeta() );

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        String xml =
            "<root>" + "<bean alpha='${attr1}' beta='var{attr1}'/>" + "<bean alpha='${attr2}' beta='var{attr2}'/>"
                + "</root>";


        StringReader input = new StringReader( xml );
        Digester digester = new Digester();


        // Configure the digester as required
        HashMap<String, Object> source1 = new HashMap<String, Object>();
        source1.put( "attr1", "source1.attr1" );
        source1.put( "attr2", "source1.attr2" ); // should not be used


        HashMap<String, Object> source2 = new HashMap<String, Object>();
        source2.put( "attr1", "source2.attr1" ); // should not be used
        source2.put( "attr2", "source2.attr2" );


        MultiVariableExpander expander = new MultiVariableExpander();
        expander.addSource( "$", source1 );
        expander.addSource( "var", source2 );


        digester.setSubstitutor( new VariableSubstitutor( expander ) );
        digester.addObjectCreate( "root/bean", SimpleTestBean.class );
        digester.addSetProperties( "root/bean" );
        digester.addSetNext( "root/bean", "addSimpleTestBean" );


        // Parse our test input.
        this.simpleTestBeans.clear();
        digester.push( this );
        digester.parse( input );


        assertEquals( 2, this.simpleTestBeans.size() );


        {
            SimpleTestBean bean = this.simpleTestBeans.get( 0 );

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    {


        String xml = "<root>" + "Twas noun{1} and the noun{2}" + " did verb{1} and verb{2} in the noun{3}" + "</root>";


        StringReader input = new StringReader( xml );
        Digester digester = new Digester();


        // Configure the digester as required
        HashMap<String, Object> nouns = new HashMap<String, Object>();
        nouns.put( "1", "brillig" );
        nouns.put( "2", "slithy toves" );
        nouns.put( "3", "wabe" );


        HashMap<String, Object> verbs = new HashMap<String, Object>();
        verbs.put( "1", "gyre" );
        verbs.put( "2", "gimble" );


        MultiVariableExpander expander = new MultiVariableExpander();
        expander.addSource( "noun", nouns );
        expander.addSource( "verb", verbs );
        digester.setSubstitutor( new VariableSubstitutor( expander ) );


        digester.addObjectCreate( "root", SimpleTestBean.class );
        digester.addCallMethod( "root", "setAlpha", 0 );


        // Parse our test input.
        SimpleTestBean root = digester.parse( input );


        assertNotNull( "Digester returned no object", root );


        assertEquals( "Twas brillig and the slithy toves" + " did gyre and gimble in the wabe", root.getAlpha() );
    }

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        throws IOException
    {


        String xml = "<root alpha='${attr1}'/>";
        StringReader input = new StringReader( xml );
        Digester digester = new Digester();


        // Configure the digester as required
        MultiVariableExpander expander = new MultiVariableExpander();
        expander.addSource( "$", new HashMap<String, Object>() );
        digester.setSubstitutor( new VariableSubstitutor( expander ) );


        digester.addObjectCreate( "root", SimpleTestBean.class );
        digester.addSetProperties( "root" );


        // Parse our test input.
        try
        {
            digester.parse( input );
            fail( "Exception expected due to unknown variable." );
        }
        catch ( SAXException e )
        {
            // expected, due to reference to undefined variable

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    public void testExpansionWithMutableSource()
        throws SAXException, IOException
    {
        String xml = "<root>" + "<property name='attr' value='prop.value'/>" + "<bean alpha='${attr}'/>" + "</root>";
        StringReader input = new StringReader( xml );
        Digester digester = createDigesterThatCanDoAnt();


        simpleTestBeans.clear();
        digester.push( this );
        digester.parse( input );


        assertEquals( 1, simpleTestBeans.size() );
        SimpleTestBean bean = simpleTestBeans.get( 0 );
        assertEquals( "prop.value", bean.getAlpha() );
    }

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    {
        String xml =
            "<root>" + "<property name='attr1' value='prop.value1'/>"
                + "<property name='attr2' value='substituted-${attr1}'/>" + "<bean alpha='${attr2}'/>" + "</root>";
        StringReader input = new StringReader( xml );
        Digester digester = createDigesterThatCanDoAnt();


        simpleTestBeans.clear();
        digester.push( this );
        digester.parse( input );


        assertEquals( 1, simpleTestBeans.size() );
        SimpleTestBean bean = simpleTestBeans.get( 0 );
        assertEquals( "substituted-prop.value1", bean.getAlpha() );
    }

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        if ( rules == null )
        {
            throw new DigesterLoadingException( "Impossible to create a new Digester with null Rules" );
        }


        Digester digester = new Digester( reader );
        digester.setRules( rules );
        digester.setSubstitutor( substitutor );
        digester.registerAll( entityValidator );
        digester.setEntityResolver( entityResolver );
        digester.setStackAction( stackAction );
        digester.setNamespaceAware( isNamespaceAware() );
        digester.setExecutorService( executorService );


        addRules( digester );


        return digester;
    }

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        throws Exception
    {
        // * tests that when a PluginCreateRule is defined with a default
        // class, that the default class is instantiated when no class
        // or id is specified in the xml file.
        Digester digester = new Digester();
        PluginRules rc = new PluginRules();
        digester.setRules( rc );


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


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


        try
        {
            digester.parse( Utils.getInputStream( this, "test2.xml" ) );
        }
        catch ( Exception e )
        {
            throw e;
        }

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