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Commons Digester example source code file (TestLocalRules.java)

This example Commons Digester source code file (TestLocalRules.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, digester, digester, exception, list, object, plugincreaterule, plugindeclarationrule, plugindeclarationrule, pluginrules, pluginrules, slider, slider, test, util

The Commons Digester TestLocalRules.java source code

/* $Id: TestLocalRules.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.junit.Test;

/**
 * Test cases for defining custom rules on the plugin class itself.
 */

public class TestLocalRules {

    // --------------------------------------------------------------- Test cases
    @Test
    public void testLocalRules() throws Exception {
        // * tests that the plugin class can define an addRules method,
        //   which gets detected and executed.
        Digester digester = new Digester();
        PluginRules rc = new PluginRules();
        digester.setRules(rc);
        
        PluginDeclarationRule pdr = new PluginDeclarationRule();
        digester.addRule("root/plugin", pdr);
        
        PluginCreateRule pcr2 = new PluginCreateRule(Widget.class);
        digester.addRule("root/widget", pcr2);
        digester.addSetNext("root/widget", "addChild");

        Container root = new Container();
        digester.push(root);
        
        try {
            digester.parse(
                Utils.getInputStream(this, "test4a.xml"));
        }
        catch(Exception e) {
            throw e;
        }
        
        Object child;
        List<Widget> children = root.getChildren();
        assertNotNull(children);
        assertEquals(3, children.size());
        
        // min/max rules should be in effect
        // setproperties should be in effect
        child = children.get(0);
        assertNotNull(child);
        assertEquals(Slider.class, child.getClass());
        Slider slider1 = (Slider) child;
        assertEquals("slider1", slider1.getLabel());
        assertEquals(1, slider1.getMin());
        assertEquals(2, slider1.getMax());
        
        // range rules should not be in effect
        // setproperties should be in effect
        child = children.get(1);
        assertNotNull(child);
        assertEquals(Slider.class, child.getClass());
        Slider slider2 = (Slider) child;
        assertEquals("slider2", slider2.getLabel());
        assertEquals(0, slider2.getMin());
        assertEquals(0, slider2.getMax());
        
        // setproperties should be working on text label
        child = children.get(2);
        assertNotNull(child);
        assertEquals(TextLabel.class, child.getClass());
        assertEquals("text1", ((TextLabel)child).getLabel());
    }

    @Test
    public void testNonStandardLocalRules() throws Exception {
        // * tests that using PluginDeclarationRule to declare an alternate
        //   rule method name invokes that alternate method instead (the
        //   input xml specifies that a method other than addRules is to
        //   be used)
        // * tests that if a rule method is defined, then a SetProperties
        //   rule is not automatically added.
        // * tests that a SetProperties rule applying to one class doesn't
        //   apply to different plugin classes mounted at the same rule.
        Digester digester = new Digester();
        PluginRules rc = new PluginRules();
        digester.setRules(rc);
        
        PluginDeclarationRule pdr = new PluginDeclarationRule();
        digester.addRule("root/plugin", pdr);
        
        PluginCreateRule pcr2 = new PluginCreateRule(Widget.class);
        digester.addRule("root/widget", pcr2);
        digester.addSetNext("root/widget", "addChild");

        Container root = new Container();
        digester.push(root);
        
        try {
            digester.parse(
                Utils.getInputStream(this, "test4b.xml"));
        }
        catch(Exception e) {
            throw e;
        }
        
        Object child;
        List<Widget> children = root.getChildren();
        assertNotNull(children);
        assertEquals(3, children.size());
        
        // min/max rules should not  be in effect
        // setproperties should not be in effect
        child = children.get(0);
        assertNotNull(child);
        assertEquals(Slider.class, child.getClass());
        Slider slider1 = (Slider) child;
        assertEquals("nolabel", slider1.getLabel());
        assertEquals(0, slider1.getMin());
        assertEquals(0, slider1.getMax());
        
        // range rules should be in effect
        // setproperties should not be in effect
        child = children.get(1);
        assertNotNull(child);
        assertEquals(Slider.class, child.getClass());
        Slider slider2 = (Slider) child;
        assertEquals("nolabel", slider2.getLabel());
        assertEquals(10, slider2.getMin());
        assertEquals(20, slider2.getMax());
        
        // setproperties should be working on text label
        child = children.get(2);
        assertNotNull(child);
        assertEquals(TextLabel.class, child.getClass());
        assertEquals("text1", ((TextLabel)child).getLabel());
    }
}

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