ActiveMQ example source code file (LinkedNodeTest.java)

This example ActiveMQ source code file (LinkedNodeTest.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 - ActiveMQ tags/keywords

intlinkednode, intlinkednode, linkednode, linkednode, linkednodetest, linkednodetest, override, string, string, testcase

The ActiveMQ LinkedNodeTest.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.activemq.util;

import junit.framework.TestCase;

/**
 * @author chirino
 */
public class LinkedNodeTest extends TestCase {

    static class IntLinkedNode extends LinkedNode {
        public final int v;

        public IntLinkedNode(int v) {
            this.v = v;
        };

        @Override
        public String toString() {
            return "" + v;
        }
    }

    IntLinkedNode i1 = new IntLinkedNode(1);
    IntLinkedNode i2 = new IntLinkedNode(2);
    IntLinkedNode i3 = new IntLinkedNode(3);
    IntLinkedNode i4 = new IntLinkedNode(4);
    IntLinkedNode i5 = new IntLinkedNode(5);
    IntLinkedNode i6 = new IntLinkedNode(6);

    public void testLinkAfter() {

        i1.linkAfter(i2.linkAfter(i3));
        // Order should be 1,2,3

        assertTrue(i1.getNext() == i2);
        assertTrue(i1.getNext().getNext() == i3);
        assertNull(i1.getNext().getNext().getNext());

        assertTrue(i3.getPrevious() == i2);
        assertTrue(i3.getPrevious().getPrevious() == i1);
        assertNull(i3.getPrevious().getPrevious().getPrevious());

        assertTrue(i1.isHeadNode());
        assertFalse(i1.isTailNode());
        assertFalse(i2.isHeadNode());
        assertFalse(i2.isTailNode());
        assertTrue(i3.isTailNode());
        assertFalse(i3.isHeadNode());

        i1.linkAfter(i4.linkAfter(i5));

        // Order should be 1,4,5,2,3

        assertTrue(i1.getNext() == i4);
        assertTrue(i1.getNext().getNext() == i5);
        assertTrue(i1.getNext().getNext().getNext() == i2);
        assertTrue(i1.getNext().getNext().getNext().getNext() == i3);
        assertNull(i1.getNext().getNext().getNext().getNext().getNext());

        assertTrue(i3.getPrevious() == i2);
        assertTrue(i3.getPrevious().getPrevious() == i5);
        assertTrue(i3.getPrevious().getPrevious().getPrevious() == i4);
        assertTrue(i3.getPrevious().getPrevious().getPrevious().getPrevious() == i1);
        assertNull(i3.getPrevious().getPrevious().getPrevious().getPrevious().getPrevious());

        assertTrue(i1.isHeadNode());
        assertFalse(i1.isTailNode());
        assertFalse(i4.isHeadNode());
        assertFalse(i4.isTailNode());
        assertFalse(i5.isHeadNode());
        assertFalse(i5.isTailNode());
        assertFalse(i2.isHeadNode());
        assertFalse(i2.isTailNode());
        assertTrue(i3.isTailNode());
        assertFalse(i3.isHeadNode());

    }

    public void testLinkBefore() {

        i3.linkBefore(i2.linkBefore(i1));

        assertTrue(i1.getNext() == i2);
        assertTrue(i1.getNext().getNext() == i3);
        assertNull(i1.getNext().getNext().getNext());

        assertTrue(i3.getPrevious() == i2);
        assertTrue(i3.getPrevious().getPrevious() == i1);
        assertNull(i3.getPrevious().getPrevious().getPrevious());

        assertTrue(i1.isHeadNode());
        assertFalse(i1.isTailNode());
        assertFalse(i2.isHeadNode());
        assertFalse(i2.isTailNode());
        assertTrue(i3.isTailNode());
        assertFalse(i3.isHeadNode());

        i2.linkBefore(i5.linkBefore(i4));

        // Order should be 1,4,5,2,3

        assertTrue(i1.getNext() == i4);
        assertTrue(i1.getNext().getNext() == i5);
        assertTrue(i1.getNext().getNext().getNext() == i2);
        assertTrue(i1.getNext().getNext().getNext().getNext() == i3);
        assertNull(i1.getNext().getNext().getNext().getNext().getNext());

        assertTrue(i3.getPrevious() == i2);
        assertTrue(i3.getPrevious().getPrevious() == i5);
        assertTrue(i3.getPrevious().getPrevious().getPrevious() == i4);
        assertTrue(i3.getPrevious().getPrevious().getPrevious().getPrevious() == i1);
        assertNull(i3.getPrevious().getPrevious().getPrevious().getPrevious().getPrevious());

        assertTrue(i1.isHeadNode());
        assertFalse(i1.isTailNode());
        assertFalse(i4.isHeadNode());
        assertFalse(i4.isTailNode());
        assertFalse(i5.isHeadNode());
        assertFalse(i5.isTailNode());
        assertFalse(i2.isHeadNode());
        assertFalse(i2.isTailNode());
        assertTrue(i3.isTailNode());
        assertFalse(i3.isHeadNode());

    }

    public void testUnlink() {

        i1.linkAfter(i2.linkAfter(i3));
        i3.linkAfter(i4);
        i1.linkBefore(i5);
        i1.linkAfter(i6);

        // Order should be 5,1,6,2,3,4
        i4.unlink();
        i5.unlink();
        i6.unlink();

        // Order should be 1,2,3

        assertTrue(i1.getNext() == i2);
        assertTrue(i1.getNext().getNext() == i3);
        assertNull(i1.getNext().getNext().getNext());

        assertTrue(i3.getPrevious() == i2);
        assertTrue(i3.getPrevious().getPrevious() == i1);
        assertNull(i3.getPrevious().getPrevious().getPrevious());

        assertTrue(i1.isHeadNode());
        assertFalse(i1.isTailNode());
        assertFalse(i2.isHeadNode());
        assertFalse(i2.isTailNode());
        assertTrue(i3.isTailNode());
        assertFalse(i3.isHeadNode());
    }

}