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

     * @return an Object which is the root of the network of Java objects
     * created by digesting fileURL
     */
    public static Object load(URL digesterRules, ClassLoader classLoader,
                              InputStream input) throws IOException, SAXException, DigesterLoadingException {
        Digester digester = createDigester(digesterRules);
        digester.setClassLoader(classLoader);
        try {
            return digester.parse(input);
        } catch (XmlLoadException ex) {
            // This is a runtime exception that can be thrown by
            // FromXmlRuleSet#addRuleInstances, which is called by the Digester
            // before it parses the file.
            throw new DigesterLoadingException(ex.getMessage(), ex);

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                                Reader reader) 
                                    throws 
                                        IOException, 
                                        SAXException, 
                                        DigesterLoadingException {
        Digester digester = createDigester(digesterRules);
        digester.setClassLoader(classLoader);
        try {
            return digester.parse(reader);
        } catch (XmlLoadException ex) {
            // This is a runtime exception that can be thrown by
            // FromXmlRuleSet#addRuleInstances, which is called by the Digester
            // before it parses the file.
            throw new DigesterLoadingException(ex.getMessage(), ex);

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     * created by digesting fileURL
     */
    public static Object load(URL digesterRules, ClassLoader classLoader,
                              InputStream input, Object rootObject) throws IOException, SAXException,
            DigesterLoadingException {
        Digester digester = createDigester(digesterRules);
        digester.setClassLoader(classLoader);
        digester.push(rootObject);
        try {
            return digester.parse(input);
        } catch (XmlLoadException ex) {
            // This is a runtime exception that can be thrown by
            // FromXmlRuleSet#addRuleInstances, which is called by the Digester
            // before it parses the file.
            throw new DigesterLoadingException(ex.getMessage(), ex);

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                                Object rootObject) 
                                    throws 
                                        IOException, 
                                        SAXException,
                                        DigesterLoadingException {
        Digester digester = createDigester(digesterRules);
        digester.setClassLoader(classLoader);
        digester.push(rootObject);
        try {
            return digester.parse(input);
        } catch (XmlLoadException ex) {
            // This is a runtime exception that can be thrown by
            // FromXmlRuleSet#addRuleInstances, which is called by the Digester
            // before it parses the file.
            throw new DigesterLoadingException(ex.getMessage(), ex);

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

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

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    public void testCreateDigester() throws Exception {
        URL rules = getClass().getClassLoader().getResource("org/apache/commons/digester/xmlrules/testrules.xml");
        URL input = getClass().getClassLoader().getResource("org/apache/commons/digester/xmlrules/test.xml");
        assertNotNull("The test could not locate testrules.xml", rules);
        assertNotNull("The test could not locate test.xml", input);
        Digester digester = DigesterLoader.createDigester(rules);
        digester.push(new ArrayList());
        Object root = digester.parse(input.openStream());
        assertEquals("[foo1 baz1 foo2, foo3 foo4]",root.toString());
    }

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     * Validates that circular includes are detected and result in an exception
     */
    public void testCircularInclude1() {
        URL rules = ClassLoader.getSystemResource("org/apache/commons/digester/xmlrules/testCircularRules.xml");
        try {
            Digester digester = DigesterLoader.createDigester(rules);
            assertNotNull(digester); // just to prevent compiler warning on unused var
        } catch (Exception ex) {
            return;
        }
        fail("Creating a digester with circular rules should have thrown CircularIncludeException.");

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        String xml = "<?xml version='1.0' ?>"
                     + "<root><foo attr='long'><bar>short</bar><foobar><ping>tosh</ping></foobar></foo></root>";
        
        CallParamTestObject testObject = new CallParamTestObject();
        
        Digester digester = DigesterLoader.createDigester(new InputSource(new StringReader(rulesXml)));
        digester.push(testObject);
        digester.parse(new StringReader(xml));        
                                                                        
        assertEquals("Incorrect left value", "long", testObject.getLeft());
        assertEquals("Incorrect middle value", "short", testObject.getMiddle());
        assertEquals("Incorrect right value", "", testObject.getRight());
    }

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        URL rules = getClass().getClassLoader().getResource("org/apache/commons/digester/xmlrules/test-node-create-rules.xml");
        URL input = getClass().getClassLoader().getResource("org/apache/commons/digester/xmlrules/test-node-create-rules-input.xml");
        assertNotNull("The test could not locate test-node-create-rules.xml", rules);
        assertNotNull("The test could not locate test-node-create-rules-input.xml", input);
        Digester digester = DigesterLoader.createDigester(rules);
        digester.push(new ArrayList());
        Object root = digester.parse(input.openStream());


        assertNotNull("root was null", root);        
        assertTrue("no nodes were captured.", (((List)root).size() > 0));
        Object[] nodeArray = (Object[])((List)root).toArray();
        assertNotNull("resulting node array from array list was null", nodeArray);

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