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Commons Collections example source code file (TestDefaultMapEntry.java)

This example Commons Collections source code file (TestDefaultMapEntry.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 Collections tags/keywords

abstracttestmapentry, defaultkeyvalue, defaultmapentry, defaultmapentry, exception, keyvalue, object, object, test, test, testdefaultmapentry, testdefaultmapentry, this, util

The Commons Collections TestDefaultMapEntry.java source code

/*
 *  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.collections.keyvalue;

import java.util.Map;

import junit.framework.Test;
import junit.framework.TestSuite;

import org.apache.commons.collections.KeyValue;

/**
 * Test the DefaultMapEntry class.
 * 
 * @since Commons Collections 3.0
 * @version $Revision: 646780 $ $Date: 2008-04-10 13:48:07 +0100 (Thu, 10 Apr 2008) $
 * 
 * @author Neil O'Toole
 */
public class TestDefaultMapEntry extends AbstractTestMapEntry {

    public TestDefaultMapEntry(String testName) {
        super(testName);

    }

    public static void main(String[] args) {
        junit.textui.TestRunner.run(TestDefaultMapEntry.class);
    }

    public static Test suite() {
        return new TestSuite(TestDefaultMapEntry.class);
    }

    //-----------------------------------------------------------------------
    /**
     * Make an instance of Map.Entry with the default (null) key and value.
     * Subclasses should override this method to return a Map.Entry
     * of the type being tested.
     */
    public Map.Entry makeMapEntry() {
        return new DefaultMapEntry(null, null);
    }

    /**
     * Make an instance of Map.Entry with the specified key and value.
     * Subclasses should override this method to return a Map.Entry
     * of the type being tested.
     */
    public Map.Entry makeMapEntry(Object key, Object value) {
        return new DefaultMapEntry(key, value);
    }

    //-----------------------------------------------------------------------
    /**
     * Subclasses should override this method.
     *
     */
    public void testConstructors() {
        // 1. test key-value constructor
        Map.Entry entry = new DefaultMapEntry(key, value);
        assertSame(key, entry.getKey());
        assertSame(value, entry.getValue());

        // 2. test pair constructor
        KeyValue pair = new DefaultKeyValue(key, value);
        assertSame(key, pair.getKey());
        assertSame(value, pair.getValue());

        // 3. test copy constructor
        Map.Entry entry2 = new DefaultMapEntry(entry);
        assertSame(key, entry2.getKey());
        assertSame(value, entry2.getValue());

        // test that the objects are independent
        entry.setValue(null);
        assertSame(value, entry2.getValue());
    }

    public void testSelfReferenceHandling() {
        Map.Entry entry = makeMapEntry();

        try {
            entry.setValue(entry);
            assertSame(entry, entry.getValue());

        } catch (Exception e) {
            fail("This Map.Entry implementation supports value self-reference.");
        }
    }

}

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