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Commons Collections example source code file (TestBoundedFifoBuffer.java)

This example Commons Collections source code file (TestBoundedFifoBuffer.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

arraylist, boundedfifobuffer, boundedfifobuffer, bufferunderflowexception, collection, collection, illegalargumentexception, iterator, object, object, string, testboundedfifobuffer, testboundedfifobuffer, underflow, util

The Commons Collections TestBoundedFifoBuffer.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.buffer;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;

import junit.framework.Test;

import org.apache.commons.collections.BufferUnderflowException;
import org.apache.commons.collections.BulkTest;
import org.apache.commons.collections.collection.AbstractTestCollection;

/**
 * Test cases for BoundedFifoBuffer.
 * 
 * @version $Revision: 646780 $ $Date: 2008-04-10 13:48:07 +0100 (Thu, 10 Apr 2008) $
 * 
 * @author Paul Jack
 */
public class TestBoundedFifoBuffer extends AbstractTestCollection {

    public TestBoundedFifoBuffer(String n) {
        super(n);
    }

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

    //-----------------------------------------------------------------------
    /**
     *  Runs through the regular verifications, but also verifies that 
     *  the buffer contains the same elements in the same sequence as the
     *  list.
     */
    public void verify() {
        super.verify();
        Iterator iterator1 = collection.iterator();
        Iterator iterator2 = confirmed.iterator();
        while (iterator2.hasNext()) {
            assertTrue(iterator1.hasNext());
            Object o1 = iterator1.next();
            Object o2 = iterator2.next();
            assertEquals(o1, o2);
        }
    }

    //-----------------------------------------------------------------------
    /**
     * Overridden because UnboundedFifoBuffer doesn't allow null elements.
     * @return false
     */
    public boolean isNullSupported() {
        return false;
    }

    /**
     * Overridden because UnboundedFifoBuffer isn't fail fast.
     * @return false
     */
    public boolean isFailFastSupported() {
        return false;
    }

    //-----------------------------------------------------------------------  
    /**
     *  Returns an empty ArrayList.
     *
     *  @return an empty ArrayList
     */
    public Collection makeConfirmedCollection() {
        return new ArrayList();
    }

    /**
     *  Returns a full ArrayList.
     *
     *  @return a full ArrayList
     */
    public Collection makeConfirmedFullCollection() {
        Collection c = makeConfirmedCollection();
        c.addAll(java.util.Arrays.asList(getFullElements()));
        return c;
    }

    /**
     *  Returns an empty BoundedFifoBuffer that won't overflow.  
     *  
     *  @return an empty BoundedFifoBuffer
     */
    public Collection makeCollection() {
        return new BoundedFifoBuffer(100);
    }

    //-----------------------------------------------------------------------  
    /**
     * Tests that the removal operation actually removes the first element.
     */
    public void testBoundedFifoBufferRemove() {
        resetFull();
        int size = confirmed.size();
        for (int i = 0; i < size; i++) {
            Object o1 = ((BoundedFifoBuffer)collection).remove();
            Object o2 = ((ArrayList)confirmed).remove(0);
            assertEquals("Removed objects should be equal", o1, o2);
            verify();
        }

        try {
            ((BoundedFifoBuffer)collection).remove();
            fail("Empty buffer should raise Underflow.");
        } catch (BufferUnderflowException e) {
            // expected
        }
    }

    /**
     * Tests that the constructor correctly throws an exception.
     */
    public void testConstructorException1() {
        try {
            new BoundedFifoBuffer(0);
        } catch (IllegalArgumentException ex) {
            return;
        }
        fail();
    }
    
    /**
     * Tests that the constructor correctly throws an exception.
     */
    public void testConstructorException2() {
        try {
            new BoundedFifoBuffer(-20);
        } catch (IllegalArgumentException ex) {
            return;
        }
        fail();
    }

    /**
     * Tests that the constructor correctly throws an exception.
     */
    public void testConstructorException3() {
        try {
            new BoundedFifoBuffer(null);
        } catch (NullPointerException ex) {
            return;
        }
        fail();
    }

    public String getCompatibilityVersion() {
        return "3.1";
    }
    
    // BZ 33071 -- gets start=end=1 before removal of interior element
    public void testShift() {
        BoundedFifoBuffer fifo = new BoundedFifoBuffer(3);
        fifo.add("a");
        fifo.add("b");
        fifo.add("c");
        fifo.remove();
        fifo.add("e");
        fifo.remove("c");
    }

//    public void testCreate() throws Exception {
//        resetEmpty();
//        writeExternalFormToDisk((java.io.Serializable) collection, "D:/dev/collections/data/test/BoundedFifoBuffer.emptyCollection.version3.1.obj");
//        resetFull();
//        writeExternalFormToDisk((java.io.Serializable) collection, "D:/dev/collections/data/test/BoundedFifoBuffer.fullCollection.version3.1.obj");
//    }

}

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