ReadOnlyListIteratorTests.java

/*******************************************************************************
 * Copyright (c) 1998, 2015 Oracle and/or its affiliates. All rights reserved.
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
 * which accompanies this distribution.
 * The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
 * and the Eclipse Distribution License is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * Contributors:
 *     Oracle - initial API and implementation from Oracle TopLink
******************************************************************************/
package org.eclipse.persistence.tools.workbench.test.utility.iterators;

import java.util.ArrayList;
import java.util.List;
import java.util.ListIterator;
import java.util.NoSuchElementException;

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

import org.eclipse.persistence.tools.workbench.utility.iterators.ReadOnlyListIterator;

public class ReadOnlyListIteratorTests extends TestCase {

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

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

    public void testHasNextAndHasPrevious() {
        int i = 0;
        ListIterator stream = this.buildReadOnlyListIterator();
        while (stream.hasNext()) {
            stream.next();
            i++;
        }
        assertEquals(this.buildList().size(), i);

        while (stream.hasPrevious()) {
            stream.previous();
            i--;
        }
        assertEquals(0, i);
    }

    public void testNextAndPrevious() {
        ListIterator nestedListIterator = this.buildNestedListIterator();
        ListIterator stream = this.buildReadOnlyListIterator();
        while (stream.hasNext()) {
            assertEquals("bogus element", nestedListIterator.next(), stream.next());
        }
        while (stream.hasPrevious()) {
            assertEquals("bogus element", nestedListIterator.previous(), stream.previous());
        }
    }

    public void testNextIndexAndPreviousIndex() {
        ListIterator nestedListIterator = this.buildNestedListIterator();
        ListIterator stream = this.buildReadOnlyListIterator();
        while (stream.hasNext()) {
            assertEquals("bogus index", nestedListIterator.nextIndex(), stream.nextIndex());
            nestedListIterator.next();
            stream.next();
        }
        assertEquals("bogus index", this.buildList().size(), stream.nextIndex());
        while (stream.hasPrevious()) {
            assertEquals("bogus element", nestedListIterator.previousIndex(), stream.previousIndex());
            nestedListIterator.previous();
            stream.previous();
        }
        assertEquals("bogus index", -1, stream.previousIndex());
    }

    public void testNoSuchElementException() {
        boolean exCaught = false;
        ListIterator stream = this.buildReadOnlyListIterator();
        String string = null;
        while (stream.hasNext()) {
            string = (String) stream.next();
        }
        try {
            string = (String) stream.next();
        } catch (NoSuchElementException ex) {
            exCaught = true;
        }
        assertTrue("NoSuchElementException not thrown: " + string, exCaught);
    }

    public void testRemove() {
        boolean exCaught = false;
        for (ListIterator stream = this.buildReadOnlyListIterator(); stream.hasNext(); ) {
            if (stream.next().equals("three")) {
                try {
                    stream.remove();
                } catch (UnsupportedOperationException ex) {
                    exCaught = true;
                }
            }
        }
        assertTrue("UnsupportedOperationException not thrown", exCaught);
    }

    public void testSet() {
        boolean exCaught = false;
        for (ListIterator stream = this.buildReadOnlyListIterator(); stream.hasNext(); ) {
            if (stream.next().equals("three")) {
                try {
                    stream.set("bogus");
                } catch (UnsupportedOperationException ex) {
                    exCaught = true;
                }
            }
        }
        assertTrue("UnsupportedOperationException not thrown", exCaught);
    }

    public void testAdd() {
        boolean exCaught = false;
        for (ListIterator stream = this.buildReadOnlyListIterator(); stream.hasNext(); ) {
            if (stream.next().equals("three")) {
                try {
                    stream.add("bogus");
                } catch (UnsupportedOperationException ex) {
                    exCaught = true;
                }
            }
        }
        assertTrue("UnsupportedOperationException not thrown", exCaught);
    }

    private ListIterator buildReadOnlyListIterator() {
        return this.buildReadOnlyListIterator(this.buildNestedListIterator());
    }

    private ListIterator buildReadOnlyListIterator(ListIterator nestedListIterator) {
        return new ReadOnlyListIterator(nestedListIterator);
    }

    private ListIterator buildNestedListIterator() {
        return this.buildList().listIterator();
    }

    private List buildList() {
        List l = new ArrayList();
        l.add("one");
        l.add("two");
        l.add("three");
        l.add("four");
        l.add("five");
        l.add("six");
        l.add("seven");
        l.add("eight");
        return l;
    }

}