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Commons Digester example source code file (TestConfigurablePluginAttributes.java)

This example Commons Digester source code file (TestConfigurablePluginAttributes.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons Digester tags/keywords

digester, exception, linkedlist, list, list, multicontainer, multicontainer, plugincreaterule, plugindeclarationrule, plugindeclarationrule, pluginrules, pluginrules, test, testconfigurablepluginattributes, util

The Commons Digester TestConfigurablePluginAttributes.java source code

/* $Id: TestConfigurablePluginAttributes.java 992060 2010-09-02 19:09:47Z simonetripodi $
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


package org.apache.commons.digester.plugins;

import static org.junit.Assert.*;

import java.util.LinkedList;
import java.util.List;

import org.apache.commons.digester.Digester;
import org.junit.Test;

/**
 * Test cases for functionality which sets what xml attributes specify
 * the plugin class or plugin declaration id.
 */

public class TestConfigurablePluginAttributes {

    // --------------------------------------------------------------- Test cases
    @Test
    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(
                Utils.getInputStream(this, "test7.xml"));

        } catch(Exception e) {
            throw e;
        }

        List<Widget> widgets = root.getWidgets();
        assertNotNull(widgets);
        assertEquals(4, widgets.size());

        assertEquals(TextLabel.class, widgets.get(0).getClass());
        assertEquals(TextLabel.class, widgets.get(1).getClass());
        assertEquals(TextLabel.class, widgets.get(2).getClass());
        assertEquals(TextLabel.class, widgets.get(3).getClass());
        
        List<Widget> gadgets = root.getGadgets();
        assertNotNull(gadgets);
        assertEquals(4, gadgets.size());

        assertEquals(TextLabel.class, gadgets.get(0).getClass());
        assertEquals(TextLabel.class, gadgets.get(1).getClass());
        assertEquals(TextLabel.class, gadgets.get(2).getClass());
        assertEquals(TextLabel.class, gadgets.get(3).getClass());
    }

    @Test
    public void testGlobalOverride() throws Exception {
        // Tests that using setDefaultPluginXXXX overrides behaviour for all
        // PluginCreateRule instances. Also tests specifying attributes
        // 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(
                Utils.getInputStream(this, "test7.xml"));
                
        } catch(Exception e) {
            throw e;
        }

        List<Widget> widgets = root.getWidgets();
        assertNotNull(widgets);
        assertEquals(4, widgets.size());

        assertEquals(Slider.class, widgets.get(0).getClass());
        assertEquals(Slider.class, widgets.get(1).getClass());
        assertEquals(Slider.class, widgets.get(2).getClass());
        assertEquals(Slider.class, widgets.get(3).getClass());
        
        List<Widget> gadgets = root.getGadgets();
        assertNotNull(gadgets);
        assertEquals(4, gadgets.size());

        assertEquals(Slider.class, gadgets.get(0).getClass());
        assertEquals(Slider.class, gadgets.get(1).getClass());
        assertEquals(Slider.class, gadgets.get(2).getClass());
        assertEquals(Slider.class, gadgets.get(3).getClass());
    }

    @Test
    public void testInstanceOverride() throws Exception {
        // Tests that using setPluginXXXX overrides behaviour for only
        // that particular PluginCreateRule instance. Also tests that
        // attributes can be in namespaces.

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

        PluginDeclarationRule pdr = new PluginDeclarationRule();
        digester.addRule("root/plugin", pdr);

        // for plugins at pattern "root/widget", use xml attributes "id" and
        // "class" in the custom namespace as the values for plugin id and
        // class, not the default (and non-namespaced) values of 
        // "plugin-id" and "plugin-class".
        PluginCreateRule widgetPluginRule = new PluginCreateRule(Widget.class);
        widgetPluginRule.setPluginIdAttribute(
            "http://commons.apache.org/digester/plugins", "id");
        widgetPluginRule.setPluginClassAttribute(
            "http://commons.apache.org/digester/plugins", "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(
                Utils.getInputStream(this, "test7.xml"));
        } catch(Exception e) {
            throw e;
        }

        List<Widget> widgets = root.getWidgets();
        assertNotNull(widgets);
        assertEquals(4, widgets.size());

        assertEquals(TextLabel2.class, widgets.get(0).getClass());
        assertEquals(TextLabel2.class, widgets.get(1).getClass());
        assertEquals(TextLabel2.class, widgets.get(2).getClass());
        assertEquals(TextLabel2.class, widgets.get(3).getClass());
        
        List<Widget> gadgets = root.getGadgets();
        assertNotNull(gadgets);
        assertEquals(4, gadgets.size());

        assertEquals(TextLabel.class, gadgets.get(0).getClass());
        assertEquals(TextLabel.class, gadgets.get(1).getClass());
        assertEquals(TextLabel.class, gadgets.get(2).getClass());
        assertEquals(TextLabel.class, gadgets.get(3).getClass());
    }
    
    // inner classes used for testing
    
    public static class MultiContainer {
        private LinkedList<Widget> widgets = new LinkedList();
        private LinkedList<Widget> gadgets = new LinkedList();
    
        public MultiContainer() {}
        
        public void addWidget(Widget child) {
            widgets.add(child);
        }
    
        public List<Widget> getWidgets() {
            return widgets;
        }

        public void addGadget(Widget child) {
            gadgets.add(child);
        }
    
        public List<Widget> getGadgets() {
            return gadgets;
        }
    }
}

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