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.

    // resource <f:resource f:key='images/spacer.gif' [f:data='...'] [ ... any attributes ... ] />
    pattern =ANY_PARENT+NS_PREFIX+RESOURCE_TAG;
    digestr.addObjectCreate(pattern,ResourceElement.class);
    digestr.addSetNext(pattern,CHILD_METHOD);
    {
    Rule rule = new PutAttributesRule(digestr,new String[]{NS_PREFIX+"key",NS_PREFIX+"property",NS_PREFIX+"baseSkin",NS_PREFIX+"skin",NS_PREFIX+"context"});
    digestr.addRule(pattern,rule);
    }
    {
    SetPropertiesRule rule = new SetPropertiesRule(new String[]{NS_PREFIX+"key",NS_PREFIX+"property",NS_PREFIX+"baseSkin",NS_PREFIX+"skin",NS_PREFIX+"context"},new String[]{"value","property","baseSkin","skin","context"});    
    digestr.addRule(pattern,rule);

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    private static void addParentRule(final String xp,
            final ExtendedBaseRules scxmlRules, final int parent) {
        if (parent < 1) {
            return;
        }
        scxmlRules.add(xp, new Rule() {
            // A generic version of setTopRule
            public void body(final String namespace, final String name,
                    final String text) throws Exception {
                TransitionTarget t = (TransitionTarget) getDigester().peek();
                TransitionTarget p = (TransitionTarget) getDigester().peek(

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            new String[] {"event", "cond", "target"},
            new String[] {"event", "cond", "next"}));
        scxmlRules.add(xp, new SetCurrentNamespacesRule());
        scxmlRules.add(xp + XPF_TAR, new SetPropertiesRule());
        addActionRules(xp, scxmlRules, pr, customActions);
        scxmlRules.add(xp + XPF_EXT, new Rule() {
            public void end(final String namespace, final String name) {
                Transition t = (Transition) getDigester().peek(1);
                State exitState = new State();
                exitState.setFinal(true);
                t.getTargets().add(exitState);

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        scxmlRules.add(xp, new SetCurrentNamespacesRule());
        addActionRules(xp, scxmlRules, pr, customActions);


        // Add <exit> custom action rule in Commons SCXML namespace
        scxmlRules.setNamespaceURI(NAMESPACE_COMMONS_SCXML);
        scxmlRules.add(xp + XPF_EXT, new Rule() {
            public void end(final String namespace, final String name) {
                Transition t = (Transition) getDigester().peek(1);
                State exitState = new State();
                exitState.setFinal(true);
                t.getTargets().add(exitState);

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     * 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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    /** Sets digeseter using these Rules */
    public void setDigester(Digester digester) {
        wrappedRules.setDigester(digester);
        Iterator it = defaultRules.iterator();
        while (it.hasNext()) {
            Rule rule = (Rule) it.next();
            rule.setDigester(digester);
        }
    }

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            digester.addCallMethod
              ("faces-config/validator/validator-id", "setValidatorId", 0);
            digester.addCallMethod
              ("faces-config/validator/validator-class", "setValidatorClass", 0);
            
            digester.addRule("faces-config/factory/visit-context-factory", new Rule() {
              @Override
              public void body(String namespace, String name, String text)
                  throws Exception {
                if (text != null && text.trim().length() != 0) {
                    FactoryFinder.setFactory("javax.faces.component.visit.VisitContextFactory", text.trim());

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     * Gets the rule that maps the <code>name</code> element
     * associated with the option
     * @return <code>Rule</code>, not null
     */
    public Rule getNameRule() {
        return new Rule() {
            public void body(String namespace, String name, String text) {
                currentName = text;
            }            
        };
    }

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     * Gets the rule that maps the <code>value</code> element
     * associated with the option
     * @return <code>Rule</code>, not null
     */
    public Rule getValueRule() {
        return new Rule() {
            public void body(String namespace, String name, String text) {
                currentValue = text;
            }            
        };
    }

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                        ElementDescriptor[] desc = currentDescriptor.getElementDescriptors();
                        if (desc.length == 1) {
                            path = "*/"+desc[0].getQualifiedName();
                        }
                    }
                    Rule rule = new BeanCreateRule( childDescriptor, context, path, matchIDs);
                    addRule(path, rule);
                    continue;
                }
                if ( childDescriptor.getUpdater() != null ) {
                    if (log.isTraceEnabled()) {
                        log.trace("Element has updater "
                         + ((MethodUpdater) childDescriptor.getUpdater()).getMethod().getName());
                    }
                    if ( childDescriptor.isPrimitiveType() ) {
                        addPrimitiveTypeRule(path, childDescriptor);
                        
                    } else {
                        // add the first child to the path
                        ElementDescriptor[] grandChildren = childDescriptor.getElementDescriptors();
                        if ( grandChildren != null && grandChildren.length > 0 ) {
                            ElementDescriptor grandChild = grandChildren[0];
                            String grandChildQName = grandChild.getQualifiedName();
                            if ( grandChildQName != null && grandChildQName.length() > 0 ) {
                                if (childDescriptor.isWrapCollectionsInElement()) {
                                    path += '/' + grandChildQName;
                                    
                                } else {
                                    path = prefix + (prefix.endsWith("/")?"":"/") + grandChildQName;
                                }
                            }
                        }
                        
                        // maybe we are adding a primitve type to a collection/array
                        Class beanClass = childDescriptor.getSingularPropertyType();
                        if ( XMLIntrospectorHelper.isPrimitiveType( beanClass ) ) {
                            addPrimitiveTypeRule(path, childDescriptor);
                            
                        } else {
                            Rule rule = new BeanCreateRule( 
                                                        childDescriptor, 
                                                        context, 
                                                        path + '/', 
                                                        matchIDs );
                            addRule( path, rule );

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