Examples of org.apache.commons.digester.Digester

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

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.

IMPLEMENTATION NOTE - A bug in Xerces 2.0.2 prevents the support of XML schema. You need Xerces 2.1/2.3 and up to make this class working with XML schema

    }


    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(
                TestAll.getInputStream(this, "test2.xml"));
        }
        catch(Exception e) {
            exception = e;
        }
        finally {
            digester.setLogger(oldLog);
        }
        
        assertTrue(exception != null);
        assertEquals(SAXParseException.class, exception.getClass());
        assertEquals(

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     * Creates a Digester configured to show Ant-like capability.
     * 
     * @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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     */
    public void testNoExpansion() 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.
        Object root = digester.parse(input);


        assertNotNull("Digester returned no object", root);
        SimpleTestBean bean = (SimpleTestBean) root;
        
        assertEquals("${attr1}", bean.getAlpha());

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     */
    public void testExpansionWithNoSource() 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.
        Object root = digester.parse(input);


        assertNotNull("Digester returned no object", root);
        SimpleTestBean bean = (SimpleTestBean) root;
        
        assertEquals("${attr1}", bean.getAlpha());

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              "<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 source1 = new HashMap();
        source1.put("attr1", "source1.attr1");
        source1.put("attr2", "source1.attr2"); // should not be used
        
        HashMap source2 = new HashMap();
        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 = (SimpleTestBean) this.simpleTestBeans.get(0);

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            "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 nouns = new HashMap();
        nouns.put("1", "brillig");
        nouns.put("2", "slithy toves");
        nouns.put("3", "wabe");
        
        HashMap verbs = new HashMap();
        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.
        Object root = digester.parse(input);


        assertNotNull("Digester returned no object", root);
        SimpleTestBean bean = (SimpleTestBean) root;
        
        assertEquals(

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     */
    public void testExpansionException() 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());
        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 testRecursiveRules() throws Exception {
        // * 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(
                TestAll.getInputStream(this, "test6.xml"));
        }
        catch(Exception e) {
            throw e;
        }

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    public void testDefaultBehaviour() throws Exception {
        // tests that by default the attributes used are 
        // named "plugin-class" and "plugin-id"


        Digester digester = new Digester();
        digester.setNamespaceAware(true);
        PluginRules rc = new PluginRules();
        digester.setRules(rc);
        
        PluginDeclarationRule pdr = new PluginDeclarationRule();
        digester.addRule("root/plugin", pdr);
        
        PluginCreateRule widgetPluginRule = new PluginCreateRule(Widget.class);
        digester.addRule("root/widget", widgetPluginRule);
        digester.addSetNext("root/widget", "addWidget");


        PluginCreateRule gadgetPluginRule = new PluginCreateRule(Widget.class);
        digester.addRule("root/gadget", gadgetPluginRule);
        digester.addSetNext("root/gadget", "addGadget");


        MultiContainer root = new MultiContainer();
        digester.push(root);
        
        try {
            digester.parse(
                TestAll.getInputStream(this, "test7.xml"));


        } catch(Exception e) {
            throw e;
        }

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        // with "null" for namespace (ie attributes not in any namespace).
        //
        // note that in order not to screw up all other tests, we need
        // to reset the global names after we finish here!


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


        rc.setPluginIdAttribute(null, "id");
        rc.setPluginClassAttribute(null, "class");
     
        PluginDeclarationRule pdr = new PluginDeclarationRule();
        digester.addRule("root/plugin", pdr);
        
        PluginCreateRule widgetPluginRule = new PluginCreateRule(Widget.class);
        digester.addRule("root/widget", widgetPluginRule);
        digester.addSetNext("root/widget", "addWidget");


        PluginCreateRule gadgetPluginRule = new PluginCreateRule(Widget.class);
        digester.addRule("root/gadget", gadgetPluginRule);
        digester.addSetNext("root/gadget", "addGadget");


        MultiContainer root = new MultiContainer();
        digester.push(root);
        
        try {
            digester.parse(
                TestAll.getInputStream(this, "test7.xml"));
                
        } catch(Exception e) {
            throw e;
        }

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