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Commons Collections example source code file (TestArrayIterator2.java)

This example Commons Collections source code file (TestArrayIterator2.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

abstracttestiterator, arrayindexoutofboundsexception, arrayindexoutofboundsexception, arrayiterator, arrayiterator, illegalargumentexception, illegalargumentexception, integer, iteration, iterator, iterator, number, object, testarrayiterator2, util

The Commons Collections TestArrayIterator2.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.iterators;

import java.util.Iterator;
import java.util.NoSuchElementException;

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

/**
 * Tests the ArrayIterator with primitive type arrays.
 * 
 * @version $Revision: 646780 $ $Date: 2008-04-10 13:48:07 +0100 (Thu, 10 Apr 2008) $
 * 
 * @author Morgan Delagrange
 * @author James Strachan
 */
public class TestArrayIterator2 extends AbstractTestIterator {

    protected int[] testArray = { 2, 4, 6, 8 };

    public static Test suite() {
        return new TestSuite(TestArrayIterator2.class);
    }

    public TestArrayIterator2(String testName) {
        super(testName);
    }

    public Iterator makeEmptyIterator() {
        return new ArrayIterator(new int[0]);
    }

    public Iterator makeFullIterator() {
        return new ArrayIterator(testArray);
    }

    /*
     * We use these <code>makeArrayIterator factory methods instead of
     * directly calling the constructor so as to allow subclasses
     * (e.g. TestArrayListIterator2) to use the existing test code.
     * 
     * @return ArrayIterator
     */
    public ArrayIterator makeArrayIterator() {
        return (ArrayIterator) makeEmptyIterator();
    }
    public ArrayIterator makeArrayIterator(Object array) {
        return new ArrayIterator(array);
    }
    public ArrayIterator makeArrayIterator(Object array, int index) {
        return new ArrayIterator(array, index);
    }
    public ArrayIterator makeArrayIterator(Object array, int start, int end) {
        return new ArrayIterator(array, start, end);
    }

    public boolean supportsRemove() {
        return false;
    }


    public void testIterator() {
        Iterator iter = (Iterator) makeFullIterator();
        for (int i = 0; i < testArray.length; i++) {
            Integer testValue = new Integer(testArray[i]);
            Number iterValue = (Number) iter.next();

            assertEquals("Iteration value is correct", testValue, iterValue);
        }

        assertTrue("Iterator should now be empty", !iter.hasNext());

        try {
            Object testValue = iter.next();
        } catch (Exception e) {
            assertTrue(
                "NoSuchElementException must be thrown",
                e.getClass().equals((new NoSuchElementException()).getClass()));
        }
    }

    // proves that an ArrayIterator set with the constructor has the same number of elements
    // as an ArrayIterator set with setArray(Object) 
    public void testSetArray() {
        Iterator iter1 = makeArrayIterator(testArray);
        int count1 = 0;
        while (iter1.hasNext()) {
            ++count1;
            iter1.next();
        }

        assertEquals("the count should be right using the constructor", count1, testArray.length);

        ArrayIterator iter2 = makeArrayIterator();
        iter2.setArray(testArray);
        int count2 = 0;
        while (iter2.hasNext()) {
            ++count2;
            iter2.next();
        }

        assertEquals("the count should be right using setArray(Object)", count2, testArray.length);
    }

    public void testIndexedArray() {
        Iterator iter = makeArrayIterator(testArray, 2);
        int count = 0;
        while (iter.hasNext()) {
            ++count;
            iter.next();
        }

        assertEquals("the count should be right using ArrayIterator(Object,2) ", count, testArray.length - 2);

        iter = makeArrayIterator(testArray, 1, testArray.length - 1);
        count = 0;
        while (iter.hasNext()) {
            ++count;
            iter.next();
        }

        assertEquals(
            "the count should be right using ArrayIterator(Object,1," + (testArray.length - 1) + ") ",
            count,
            testArray.length - 2);

        try {
            iter = makeArrayIterator(testArray, -1);
            fail("new ArrayIterator(Object,-1) should throw an ArrayIndexOutOfBoundsException");
        } catch (ArrayIndexOutOfBoundsException aioobe) {
            // expected
        }

        try {
            iter = makeArrayIterator(testArray, testArray.length + 1);
            fail("new ArrayIterator(Object,length+1) should throw an ArrayIndexOutOfBoundsException");
        } catch (ArrayIndexOutOfBoundsException aioobe) {
            // expected
        }

        try {
            iter = makeArrayIterator(testArray, 0, -1);
            fail("new ArrayIterator(Object,0,-1) should throw an ArrayIndexOutOfBoundsException");
        } catch (ArrayIndexOutOfBoundsException aioobe) {
            // expected
        }

        try {
            iter = makeArrayIterator(testArray, 0, testArray.length + 1);
            fail("new ArrayIterator(Object,0,length+1) should throw an ArrayIndexOutOfBoundsException");
        } catch (ArrayIndexOutOfBoundsException aioobe) {
            // expected
        }

        try {
            iter = makeArrayIterator(testArray, 1, 1);
            // expected not to fail
        } catch (IllegalArgumentException iae) {
            // MODIFIED: an iterator over a zero-length section of array
            //  should be perfectly legal behavior
            fail("new ArrayIterator(Object,1,1) should NOT throw an IllegalArgumentException");
        }

        try {
            iter = makeArrayIterator(testArray, testArray.length - 1, testArray.length - 2);
            fail("new ArrayIterator(Object,length-2,length-1) should throw an IllegalArgumentException");
        } catch (IllegalArgumentException iae) {
            // expected
        }
    }
}

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