test.ca.odell.glazedlists.ListModificationTest Maven / Gradle / Ivy

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/* Glazed Lists                                                 (c) 2003-2006 */
/* http://publicobject.com/glazedlists/                      publicobject.com,*/
/*                                                     O'Dell Engineering Ltd.*/
package ca.odell.glazedlists;

// for being a JUnit test case
import ca.odell.glazedlists.matchers.Matcher;
import junit.framework.TestCase;

import java.util.ArrayList;
import java.util.List;

/**
 * The ListModificationTest verifies that modifications made to lists are
 * performed correctly. It also verifies that modifications made to transformation
 * lists have  the correct side effects on their source lists.
 *
 * @see Bug 44
 *
 * @author Jesse Wilson
 */
public class ListModificationTest extends TestCase {


    /**
     * Tests that clearing a transformed list works and has the desired
     * side effects on the original list.
     */
    public void testSubListClear() {
        List alphabet = new BasicEventList();
        alphabet.add("A");
        alphabet.add("B");
        alphabet.add("C");
        alphabet.add("D");
        alphabet.add("E");
        alphabet.add("F");

        List controlList = new ArrayList();
        controlList.addAll(alphabet);

        alphabet.subList(1, 3).clear();
        controlList.remove(1);
        controlList.remove(1);

        assertEquals(controlList, alphabet);
    }

    public static void main(String[] args) {
        new ListModificationTest().testSubListClear();
    }

    /**
     * Tests that clearing a transformed list works and has the desired
     * side effects on the original list.
     */
    public void testFilterListClear() {
        EventList alphabet = new BasicEventList();
        alphabet.add("A");
        alphabet.add("B");
        alphabet.add("C");
        alphabet.add("D");
        alphabet.add("E");
        alphabet.add("F");

        List controlList = new ArrayList();
        controlList.addAll(alphabet);

        List vowels = new FilterList(alphabet, new VowelMatcher());
        vowels.clear();
        controlList.remove(0);
        controlList.remove(3);

        assertEquals(controlList, alphabet);
    }

    /**
     * Tests that removing from a transformed list works and has the desired
     * side effects on the original list.
     */
    public void testRemove() {
        EventList alphabet = new BasicEventList();
        alphabet.add("A");
        alphabet.add("B");
        alphabet.add("C");
        alphabet.add("D");
        alphabet.add("E");
        alphabet.add("F");

        List controlList = new ArrayList();
        controlList.addAll(alphabet);

        List vowels = new FilterList(alphabet, new VowelMatcher());
        vowels.remove("C");
        vowels.remove("A");
        controlList.remove("A");

        assertEquals(controlList, alphabet);
    }

    /**
     * Tests that removing from a transformed list works and has the desired
     * side effects on the original list.
     */
    public void testRemoveAll() {
        EventList alphabet = new BasicEventList();
        alphabet.add("A");
        alphabet.add("B");
        alphabet.add("C");
        alphabet.add("D");
        alphabet.add("E");
        alphabet.add("F");

        List controlList = new ArrayList();
        controlList.addAll(alphabet);

        List vowels = new FilterList(alphabet, new VowelMatcher());

        List toRemove = new ArrayList();
        toRemove.add("C");
        toRemove.add("A");
        vowels.removeAll(toRemove);
        controlList.remove("A");

        assertEquals(controlList, alphabet);
    }

    /**
     * Tests that retaining from a transformed list works and has the desired
     * side effects on the original list.
     */
    public void testRetainAll() {
        EventList alphabet = new BasicEventList();
        alphabet.add("A");
        alphabet.add("B");
        alphabet.add("C");
        alphabet.add("D");
        alphabet.add("E");
        alphabet.add("F");

        List controlList = new ArrayList();
        controlList.addAll(alphabet);

        List vowels = new FilterList(alphabet, new VowelMatcher());

        List toRetain = new ArrayList();
        toRetain.add("C");
        toRetain.add("E");
        vowels.retainAll(toRetain);
        controlList.remove("A");

        assertEquals(controlList, alphabet);
    }

    /**
     * A simple filter that filters out anything that is not a vowel.
     */
    static class VowelMatcher implements Matcher {
        public boolean matches(String letter) {
            if(letter.length() != 1) return false;
            return ("AEIOUaeiou".indexOf(letter) != -1);
        }
    }
}