Commons Attributes example source code file (CircularDependencyTestCase.java)

This example Commons Attributes source code file (CircularDependencyTestCase.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 Attributes tags/keywords

attributeone, attributeone, attributetwo, attributetwo, circulardependencyerror, circulardependencytestcase, circulardependencytestcase, exception, exception, testcase

The Commons Attributes CircularDependencyTestCase.java source code

/*
 * Copyright 2003-2004 The Apache Software Foundation
 * 
 * Licensed 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.attributes.test;

import junit.framework.TestCase;

import org.apache.commons.attributes.Attributes;
import org.apache.commons.attributes.CircularDependencyError;

public class CircularDependencyTestCase extends TestCase {
    
    /**
     * @@CircularDependencyTestCase.AttributeTwo()
     */
    public static class AttributeOne {}
    
    public static class AttributeTwo extends AttributeOne {}
    
    public void testCircularDependencies () throws Exception {
        try {
            // This should fail, because when loading attributes for Two,
            // the runtime has to get inheritable attributes from One.
            // This means it has to check if Two is Inheritable. But it
            // is already loading Two -> Circular dependency.
            Attributes.getAttributes (AttributeTwo.class);
            
            fail ();
        } catch (CircularDependencyError cde) {
            // OK.
            assertEquals ("org.apache.commons.attributes.test.CircularDependencyTestCase$AttributeTwo:" + 
                "org.apache.commons.attributes.test.CircularDependencyTestCase$AttributeTwo -> " + 
                "org.apache.commons.attributes.test.CircularDependencyTestCase$AttributeOne -> " +
                "org.apache.commons.attributes.test.CircularDependencyTestCase$AttributeTwo", cde.getMessage ());
        }
    }
}