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Commons Digester example source code file (TestRuleInfo.java)

This example Commons Digester source code file (TestRuleInfo.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, list, object, plugincreaterule, plugindeclarationrule, plugindeclarationrule, pluginrules, pluginrules, test, textlabel2, util

The Commons Digester TestRuleInfo.java source code

/* $Id: TestRuleInfo.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 the declaration of custom rules for a plugin using
 * a separate class to define the rules.
 */

public class TestRuleInfo {

    // --------------------------------------------------------------- Test cases
    @Test
    public void testRuleInfoExplicitClass() throws Exception {
        // * tests that custom rules can be declared on a 
        //   separate class by explicitly declaring the rule class.

        Digester digester = new Digester();
        PluginRules rc = new PluginRules();
        digester.setRules(rc);
        
        PluginDeclarationRule pdr = new PluginDeclarationRule();
        digester.addRule("root/plugin", pdr);
        
        PluginCreateRule pcr = new PluginCreateRule(Widget.class);
        digester.addRule("root/widget", pcr);
        digester.addSetNext("root/widget", "addChild");

        Container root = new Container();
        digester.push(root);
        
        try {
            digester.parse(
                Utils.getInputStream(this, "test5a.xml"));
        }
        catch(Exception e) {
            throw e;
        }

        Object child;
        List<Widget> children = root.getChildren();
        assertNotNull(children);
        assertEquals(1, children.size());
        
        child = children.get(0);
        assertNotNull(child);
        assertEquals(TextLabel2.class, child.getClass());
        TextLabel2 label = (TextLabel2) child;
        
        // id should not be mapped, label should
        assertEquals("anonymous", label.getId());
        assertEquals("std label", label.getLabel());
    }

    @Test
    public void testRuleInfoExplicitMethod() throws Exception {
        // * tests that custom rules can be declared on a 
        //   separate class by explicitly declaring the rule class.
        //   and explicitly declaring the rule method name.

        Digester digester = new Digester();
        PluginRules rc = new PluginRules();
        digester.setRules(rc);
        
        PluginDeclarationRule pdr = new PluginDeclarationRule();
        digester.addRule("root/plugin", pdr);
        
        PluginCreateRule pcr = new PluginCreateRule(Widget.class);
        digester.addRule("root/widget", pcr);
        digester.addSetNext("root/widget", "addChild");

        Container root = new Container();
        digester.push(root);
        
        try {
            digester.parse(
                Utils.getInputStream(this, "test5b.xml"));
        }
        catch(Exception e) {
            throw e;
        }

        Object child;
        List<Widget> children = root.getChildren();
        assertNotNull(children);
        assertEquals(1, children.size());
        
        child = children.get(0);
        assertNotNull(child);
        assertEquals(TextLabel2.class, child.getClass());
        TextLabel2 label = (TextLabel2) child;
        
        // id should not be mapped, altlabel should
        assertEquals("anonymous", label.getId());
        assertEquals("alt label", label.getLabel());
    }

    @Test
    public void testRuleInfoAutoDetect() throws Exception {
        // * tests that custom rules can be declared on a 
        //   separate class with name {plugin-class}RuleInfo,
        //   and they are automatically detected and loaded.

        Digester digester = new Digester();
        PluginRules rc = new PluginRules();
        digester.setRules(rc);
        
        PluginDeclarationRule pdr = new PluginDeclarationRule();
        digester.addRule("root/plugin", pdr);
        
        PluginCreateRule pcr = new PluginCreateRule(Widget.class);
        digester.addRule("root/widget", pcr);
        digester.addSetNext("root/widget", "addChild");

        Container root = new Container();
        digester.push(root);
        
        try {
            digester.parse(
                Utils.getInputStream(this, "test5c.xml"));
        }
        catch(Exception e) {
            throw e;
        }

        Object child;
        List<Widget> children = root.getChildren();
        assertNotNull(children);
        assertEquals(1, children.size());
        
        child = children.get(0);
        assertNotNull(child);
        assertEquals(TextLabel2.class, child.getClass());
        TextLabel2 label = (TextLabel2) child;
        
        // id should not be mapped, label should
        assertEquals("anonymous", label.getId());
        assertEquals("std label", label.getLabel());
    }
}

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