Examples of org.apache.commons.digester.Rule

org.apache.commons.digester.Rule
Concrete implementations of this class implement actions to be taken when a corresponding nested pattern of XML elements has been matched.
Writing a custom Rule is considered perfectly normal when using Digester, and is encouraged whenever the default set of Rule classes don't meet your requirements; the digester framework can help process xml even when the built-in rules aren't quite what is needed. Creating a custom Rule is just as easy as subclassing javax.servlet.http.HttpServlet for webapps, or javax.swing.Action for GUI applications.
If a rule wishes to manipulate a digester stack (the default object stack, a named stack, or the parameter stack) then it should only ever push objects in the rule's begin method and always pop exactly the same number of objects off the stack during the rule's end method. Of course peeking at the objects on the stacks can be done from anywhere.
Rule objects should be stateless, ie they should not update any instance member during the parsing process. A rule instance that changes state will encounter problems if invoked in a "nested" manner; this can happen if the same instance is added to digester multiple times or if a wildcard pattern is used which can match both an element and a child of the same element. The digester object stack and named stacks should be used to store any state that a rule requires, making the rule class safe under all possible uses.

     * working.
     */
    private void addOldArgRules(Digester digester) {


        // Create a new rule to process args elements
        Rule rule = new Rule() {
            public void begin(String namespace, String name, 
                               Attributes attributes) throws Exception {
                // Create the Arg
                Arg arg = new Arg();
                arg.setKey(attributes.getValue("key"));

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    public List match(String namespaceURI, String pattern) {
        List list = rules.match(namespaceURI, pattern);
        List sublist = new ArrayList(list.size());


        for (Iterator i = list.iterator(); i.hasNext(); ) {
            Rule rule = (Rule) i.next();


            if (!(rule instanceof ContextSensitiveRule) || ((ContextSensitiveRule) rule).isContextMatched(context)) {
                sublist.add(rule);
            }
        }

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    /**
     * Factory for creating a BeanPropertySetterRule.
     */
    private class BeanPropertySetterRuleFactory extends AbstractObjectCreationFactory {
        public Object createObject(Attributes attributes) throws Exception {
            Rule beanPropertySetterRule = null;
            String propertyname = attributes.getValue("propertyname");
                
            if (propertyname == null) {
                // call the setter method corresponding to the element name.
                beanPropertySetterRule = new BeanPropertySetterRule();

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    /**
     * Factory for creating a CallMethodRule.
     */
    protected class CallMethodRuleFactory extends AbstractObjectCreationFactory {
        public Object createObject(Attributes attributes) {
            Rule callMethodRule = null;
            String methodName = attributes.getValue("methodname");


            // Select which element is to be the target. Default to zero,
            // ie the top object on the stack.
            int targetOffset = 0;

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            // create callparamrule
            int paramIndex = Integer.parseInt(attributes.getValue("paramnumber"));
            String attributeName = attributes.getValue("attrname");
            String fromStack = attributes.getValue("from-stack");
            String stackIndex = attributes.getValue("stack-index");
            Rule callParamRule = null;


            if (attributeName == null) {
                if (stackIndex != null) {                    
                    callParamRule = new CallParamRule(
                        paramIndex, Integer.parseInt(stackIndex));

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            int paramIndex = Integer.parseInt(attributes.getValue("paramnumber"));
            String attributeName = attributes.getValue("attrname");
            String type = attributes.getValue("type");
            String value = attributes.getValue("value");


            Rule objectParamRule = null;


            // type name is requried
            if (type == null) {
                throw new RuntimeException("Attribute 'type' is required.");
            }

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        if ((rules != null) && (rules.size() > 0)) {
            Log log = digester.getLogger();
            boolean debug = log.isDebugEnabled();
            for (int i = 0; i < rules.size(); i++) {
                try {
                    Rule rule = (Rule) rules.get(i);
                    if (debug) {
                        log.debug("  Fire begin() for " + rule);
                    }
                    rule.begin(namespace, name, list);
                } catch (Exception e) {
                    throw digester.createSAXException(e);
                } catch (Error e) {
                    throw e;
                }

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        if ((rules != null) && (rules.size() > 0)) {
            Log log = digester.getLogger();
            boolean debug = log.isDebugEnabled();
            for (int i = 0; i < rules.size(); i++) {
                try {
                    Rule rule = (Rule) rules.get(i);
                    if (debug) {
                        log.debug("  Fire body() for " + rule);
                    }
                    rule.body(namespaceURI, name, text);
                } catch (Exception e) {
                    throw digester.createSAXException(e);
                } catch (Error e) {
                    throw e;
                }

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            Log log = digester.getLogger();
            boolean debug = log.isDebugEnabled();
            for (int i = 0; i < rules.size(); i++) {
                int j = (rules.size() - i) - 1;
                try {
                    Rule rule = (Rule) rules.get(j);
                    if (debug) {
                        log.debug("  Fire end() for " + rule);
                    }
                    rule.end(namespaceURI, name);
                } catch (Exception e) {
                    throw digester.createSAXException(e);
                } catch (Error e) {
                    throw e;
                }

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        // <binding> inside <component>


        pattern = rootElementName + "/component/binding";


        Rule createBindingSpecificationRule = new CreateBindingSpecificationRule();


        digester.addRule(pattern, createBindingSpecificationRule);
        digester.addInitializeProperty(pattern, "type", BindingType.DYNAMIC);
        digester.addSetExtendedProperty(pattern, "expression", "value", true);
        digester.addConnectChild(pattern, "setBinding", "name");


        // <field-binding> inside <component>
        // For compatibility with 1.3 DTD only, removed in 3.0 DTD


        pattern = rootElementName + "/component/field-binding";


        digester.addRule(pattern, createBindingSpecificationRule);
        digester.addInitializeProperty(pattern, "type", BindingType.FIELD);
        digester.addSetExtendedProperty(pattern, "field-name", "value", true);
        digester.addConnectChild(pattern, "setBinding", "name");


        // <inherited-binding> inside <component>


        pattern = rootElementName + "/component/inherited-binding";


        digester.addRule(pattern, createBindingSpecificationRule);
        digester.addInitializeProperty(pattern, "type", BindingType.INHERITED);
        digester.addSetLimitedProperties(pattern, "parameter-name", "value");
        digester.addConnectChild(pattern, "setBinding", "name");


        // <static-binding> inside <component>


        pattern = rootElementName + "/component/static-binding";


        digester.addRule(pattern, createBindingSpecificationRule);
        digester.addInitializeProperty(pattern, "type", BindingType.STATIC);
        digester.addSetExtendedProperty(pattern, "value", "value", true);
        digester.addConnectChild(pattern, "setBinding", "name");


        // <string-binding> inside <component>
        // Maintained just for 1.3 DTD compatibility


        pattern = rootElementName + "/component/string-binding";


        digester.addRule(pattern, createBindingSpecificationRule);
        digester.addInitializeProperty(pattern, "type", BindingType.STRING);
        digester.addSetLimitedProperties(pattern, "key", "value");
        digester.addConnectChild(pattern, "setBinding", "name");


        // Renamed to <message-binding> in the 3.0 DTD


        pattern = rootElementName + "/component/message-binding";


        digester.addRule(pattern, createBindingSpecificationRule);
        digester.addInitializeProperty(pattern, "type", BindingType.STRING);
        digester.addSetLimitedProperties(pattern, "key", "value");
        digester.addConnectChild(pattern, "setBinding", "name");


        // <listener-binding> inside <component>


        pattern = rootElementName + "/component/listener-binding";


        digester.addRule(pattern, new CreateListenerBindingSpecificationRule());
        digester.addSetLimitedProperties(pattern, "language", "language");
        digester.addBody(pattern, "value");
        digester.addConnectChild(pattern, "setBinding", "name");


        // <external-asset>


        pattern = rootElementName + "/external-asset";


        Rule createAssetSpecificationRule = new CreateAssetSpecificationRule();


        digester.addRule(pattern, createAssetSpecificationRule);
        digester.addInitializeProperty(pattern, "type", AssetType.EXTERNAL);
        digester.addValidate(
            pattern,

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