AbsoluteXPathCircularReferenceTest.java

/*
 * Copyright (C) 2006, 2007, 2008 XStream Committers.
 * All rights reserved.
 *
 * The software in this package is published under the terms of the BSD
 * style license a copy of which has been included with this distribution in
 * the LICENSE.txt file.
 * 
 * Created on 17. March 2006 by Joerg Schaible
 */
package com.thoughtworks.acceptance;

import com.thoughtworks.xstream.XStream;

public class AbsoluteXPathCircularReferenceTest extends AbstractCircularReferenceTest {

    // inherits test from superclass
    protected void setUp() throws Exception {
        super.setUp();
        xstream.setMode(XStream.XPATH_ABSOLUTE_REFERENCES);
    }

    public void testCircularReferenceXml() {
        Person bob = new Person("bob");
        Person jane = new Person("jane");
        bob.likes = jane;
        jane.likes = bob;

        String expected = "" +
                "<person>\n" +
                "  <firstname>bob</firstname>\n" +
                "  <likes>\n" +
                "    <firstname>jane</firstname>\n" +
                "    <likes reference=\"/person\"/>\n" +
                "  </likes>\n" +
                "</person>";

        assertEquals(expected, xstream.toXML(bob));
    }

    public void testCircularReferenceToSelfXml() {
        Person bob = new Person("bob");
        bob.likes = bob;

        String expected = "" +
                "<person>\n" +
                "  <firstname>bob</firstname>\n" +
                "  <likes reference=\"/person\"/>\n" +
                "</person>";

        assertEquals(expected, xstream.toXML(bob));
    }
    
    static class LinkedElement {
        String name;
        LinkedElement next;
        LinkedElement(String name) {
            this.name = name;
        }
    }

    public void testRing() {
        LinkedElement tom = new LinkedElement("Tom");
        LinkedElement dick = new LinkedElement("Dick");
        LinkedElement harry = new LinkedElement("Harry");
        tom.next = dick;
        dick.next = harry;
        harry.next = tom;
        
        xstream.alias("elem", LinkedElement.class);
        String expected = "" +
            "<elem>\n" +
            "  <name>Tom</name>\n" +
            "  <next>\n" +
            "    <name>Dick</name>\n" +
            "    <next>\n" +
            "      <name>Harry</name>\n" +
            "      <next reference=\"/elem\"/>\n" +
            "    </next>\n" +
            "  </next>\n" +
            "</elem>";

        assertEquals(expected, xstream.toXML(tom));
    }
}