testsequencedhashmap.java

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/*
 * Copyright 2001-2004 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.collections;
import java.io.IOException;
import java.io.Serializable;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import junit.framework.Test;

/**
 * Unit tests 
 * {@link org.apache.commons.collections.SequencedHashMap}.
 * Be sure to use the "labRat" instance whenever possible,
 * so that subclasses will be tested correctly.
 * 
 * @author <a href="mailto:[e-mail]">Morgan Delagrange</a>
 * @author <a href="mailto:[e-mail]">Daniel Rall</a>
 * @author <a href="mailto:[e-mail]">Henning P. Schmiedehausen</a>
 * @author <a href="mailto:[e-mail]">James Strachan</a>
 */
public class TestSequencedHashMap extends TestMap {
    /**
     * The instance to experiment on.
     */
    protected SequencedHashMap labRat;

    public TestSequencedHashMap(String name) {
        super(name);
    }

    public static Test suite() {
        return BulkTest.makeSuite(TestSequencedHashMap.class);
    }

    // current versions of SequencedHashMap and subclasses are not
    // compatible with Collections 1.x
    public int getCompatibilityVersion() {
        return 2;
    }

    public static void main(String[] args[]) {
        String[] testCaseName = { TestSequencedHashMap.class.getName() };
        junit.textui.TestRunner.main(testCaseName);
    }

    public void setUp() throws Exception {
        super.setUp();
        // use makeMap and cast the result to a SeqHashMap
        // so that subclasses of SeqHashMap can share these tests
        labRat = (SequencedHashMap) makeEmptyMap();
    }

    public Map makeEmptyMap() {
        return new SequencedHashMap();
    }

    protected Object[] getKeys() {
        return new Object[] { "foo", "baz", "eek" };
    }

    protected Object[] getValues() {
        return new Object[] { "bar", "frob", new Object() };
    }
 
    public void testSequenceMap() throws Throwable {
        Object[] keys = getKeys();
        int expectedSize = keys.length;
        Object[] values = getValues();
        for (int i = 0; i < expectedSize; i++) {
            labRat.put(keys[i], values[i]);
        }

        // Test size().
        assertEquals("size() does not match expected size",
                     expectedSize, labRat.size());

        // Test clone(), iterator(), and get(Object).
        SequencedHashMap clone = (SequencedHashMap) labRat.clone();
        assertEquals("Size of clone does not match original",
                     labRat.size(), clone.size());
        Iterator origEntries = labRat.entrySet().iterator();
        Iterator copiedEntries = clone.entrySet().iterator();
        while (origEntries.hasNext()) {
            Map.Entry origEntry = (Map.Entry)origEntries.next();
            Map.Entry copiedEntry = (Map.Entry)copiedEntries.next();
            assertEquals("Cloned key does not match original",
                         origEntry.getKey(), copiedEntry.getKey());
            assertEquals("Cloned value does not match original",
                         origEntry.getValue(), copiedEntry.getValue());
            assertEquals("Cloned entry does not match orginal",
                         origEntry, copiedEntry);
        }
        assertTrue("iterator() returned different number of elements than keys()",
               !copiedEntries.hasNext());

        // Test sequence()
        List seq = labRat.sequence();
        assertEquals("sequence() returns more keys than in the Map",
                     expectedSize, seq.size());

        for (int i = 0; i < seq.size(); i++) {
            assertEquals("Key " + i + " is not the same as the key in the Map",
                         keys[i], seq.get(i));
        }
    }

    public void testYoungest() {
        labRat.put(new Integer(1),"foo");
        labRat.put(new Integer(2),"bar");
        assertTrue("first key is correct",labRat.get(0).equals(new Integer(1)));
        labRat.put(new Integer(1),"boo");
        assertTrue("second key is reassigned to first",labRat.get(0).equals(new Integer(2)));
    }

    public void testYoungestReplaceNullWithValue() {
        labRat.put(new Integer(1),null);
        labRat.put(new Integer(2),"foo");
        assertTrue("first key is correct",labRat.get(0).equals(new Integer(1)));
        labRat.put(new Integer(1),"bar");
        assertTrue("second key is reassigned to first",labRat.get(0).equals(new Integer(2)));
    }

    public void testYoungestReplaceValueWithNull() {
        labRat.put(new Integer(1),"bar");
        labRat.put(new Integer(2),"foo");
        assertTrue("first key is correct",labRat.get(0).equals(new Integer(1)));
        labRat.put(new Integer(1),null);
        assertTrue("second key is reassigned to first",labRat.get(0).equals(new Integer(2)));
    }

    // override TestMap method with more specific tests
    public void testFullMapSerialization() 
    throws IOException, ClassNotFoundException {
        SequencedHashMap map = (SequencedHashMap) makeFullMap();

        if (!(map instanceof Serializable)) return;  

        byte[] objekt = writeExternalFormToBytes((Serializable) map);
        SequencedHashMap map2 = (SequencedHashMap) readExternalFormFromBytes(objekt);

        assertEquals("Both maps are same size",map.size(), getSampleKeys().length);
        assertEquals("Both maps are same size",map2.size(),getSampleKeys().length);

        assertEquals("Both maps have the same first key",
                     map.getFirstKey(),getSampleKeys()[0]);
        assertEquals("Both maps have the same first key",
                     map2.getFirstKey(),getSampleKeys()[0]);
        assertEquals("Both maps have the same last key",
                     map.getLastKey(),getSampleKeys()[getSampleKeys().length - 1]);
        assertEquals("Both maps have the same last key",
                     map2.getLastKey(),getSampleKeys()[getSampleKeys().length - 1]);
    }

    protected void tearDown() {
        labRat = null;
    }
}