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Commons Digester example source code file (TestDefaultPlugin.java)

This example Commons Digester source code file (TestDefaultPlugin.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

container, container, digester, digester, exception, exception, log, nooplog, plugincreaterule, pluginrules, pluginrules, sax, slider, testdefaultplugin, textlabel, util

The Commons Digester TestDefaultPlugin.java source code

/* $Id: TestDefaultPlugin.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.List;

import org.apache.commons.digester.Digester;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.impl.NoOpLog;
import org.junit.Test;
import org.xml.sax.SAXParseException;

public class TestDefaultPlugin {

    // --------------------------------------------------------------- Test cases
    @Test
    public void testDefaultPlugins1() throws Exception {
        // * tests that when a PluginCreateRule is defined with a default
        //   class, that the default class is instantiated when no class
        //   or id is specified in the xml file.
        Digester digester = new Digester();
        PluginRules rc = new PluginRules();
        digester.setRules(rc);
        
        PluginCreateRule pcr = new PluginCreateRule(Widget.class, TextLabel.class);
        digester.addRule("root/widget", pcr);
        digester.addSetNext("root/widget", "addChild");

        Container root = new Container();
        digester.push(root);
        
        try {
            digester.parse(
                Utils.getInputStream(this, "test2.xml"));
        }
        catch(Exception e) {
            throw e;
        }
        
        Object child;
        List<Widget> children = root.getChildren();
        assertNotNull(children);
        assertEquals(3, children.size());
        
        child = children.get(0);
        assertNotNull(child);
        assertEquals(TextLabel.class, child.getClass());
        TextLabel label1 = (TextLabel) child;
        assertEquals("label1", label1.getLabel());
        
        child = children.get(1);
        assertNotNull(child);
        assertEquals(TextLabel.class, child.getClass());
        TextLabel label2 = (TextLabel) child;
        assertEquals("label2", label2.getLabel());
        
        child = children.get(2);
        assertNotNull(child);
        assertEquals(Slider.class, child.getClass());
        Slider slider1 = (Slider) child;
        assertEquals("slider1", slider1.getLabel());
    }

    public void testDefaultPlugins2() throws Exception {
        // * tests that when there is no default plugin, it is an error
        //   not to have one of plugin-class or plugin-id specified
        Digester digester = new Digester();
        PluginRules rc = new PluginRules();
        digester.setRules(rc);
        
        PluginCreateRule pcr = new PluginCreateRule(Widget.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(
                Utils.getInputStream(this, "test2.xml"));
        }
        catch(Exception e) {
            exception = e;
        }
        finally {
            digester.setLogger(oldLog);
        }
        
        assertNotNull(exception);
        assertEquals(SAXParseException.class, exception.getClass());
        assertEquals(
            PluginInvalidInputException.class, 
            ((SAXParseException)exception).getException().getClass());
    }

    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(
                Utils.getInputStream(this, "test2.xml"));
        }
        catch(Exception e) {
            exception = e;
        }
        finally {
            digester.setLogger(oldLog);
        }
        
        assertNotNull(exception);
        assertEquals(SAXParseException.class, exception.getClass());
        assertEquals(
            PluginConfigurationException.class, 
            ((SAXParseException)exception).getException().getClass());
    }
}

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