Examples of java.util.ListIterator

java.util.ListIterator
An iterator for lists that allows the programmer to traverse the list in either direction, modify the list during iteration, and obtain the iterator's current position in the list. A ListIterator has no current element; its cursor position always lies between the element that would be returned by a call to previous() and the element that would be returned by a call to next(). An iterator for a list of length n has n+1 possible cursor positions, as illustrated by the carets (^) below:
```
 Element(0)   Element(1)   Element(2)   ... Element(n-1) cursor positions:  ^            ^            ^            ^                  ^ 
```
Note that the {@link #remove} and {@link #set(Object)} methods arenot defined in terms of the cursor position; they are defined to operate on the last element returned by a call to {@link #next} or {@link #previous()}.
This interface is a member of the Java Collections Framework. @author Josh Bloch @version 1.28, 04/21/06 @see Collection @see List @see Iterator @see Enumeration @see List#listIterator() @since 1.2


         // only one iteration should be necessary, but we won't sweat it.
         // 2 iterations are needed by cmp...jdbc/bridge/JDBCCMRFieldBridge which
         // assumes persistence managers are all set up for every
         // bean in the relationship!
         ListIterator iter = containerOrdering.listIterator();
         while (iter.hasNext())
         {
            Container con = (Container) iter.next();
            ObjectName jmxName = con.getJmxName();
            /*
             * Add the container mbean to the deployment mbeans so the state of the deployment can be tracked.
             */
            server.registerMBean(con, jmxName);

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    */
   @Override
   protected void startService() throws Exception
   {
      // before EntityContainer returns from the startService, its PM should be usable
      ListIterator iter = containerOrdering.listIterator();
      while (iter.hasNext())
      {
         Container con = (Container) iter.next();
         if (con.getBeanMetaData().isEntity())
         {
            ClassLoader oldCl = SecurityActions.getContextClassLoader();
            SecurityActions.setContextClassLoader(con.getClassLoader());
            con.pushENC();
            try
            {
               ((EntityContainer) con).getPersistenceManager().start();
            }
            finally
            {
               con.popENC();
               // Reset classloader
               SecurityActions.setContextClassLoader(oldCl);
            }
         }
      }


      iter = containerOrdering.listIterator();
      while (iter.hasNext())
      {
         Container con = (Container) iter.next();
         log.debug("startService, starting container: " + con.getBeanMetaData().getEjbName());
         serviceController.start(con.getJmxName());
      }
   }

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    * Stops all the containers of this application.
    */
   @Override
   protected void stopService() throws Exception
   {
      ListIterator iter = containerOrdering.listIterator(containerOrdering.size());
      while (iter.hasPrevious())
      {
         Container con = (Container) iter.previous();
         try
         {
            ObjectName jmxName = con.getJmxName();
            // The container may already be destroyed so validate metaData
            BeanMetaData metaData = con.getBeanMetaData();

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      WebServiceMBean webServer = null;
      if (webServiceName != null)
      {
         webServer = (WebServiceMBean) MBeanProxyExt.create(WebServiceMBean.class, webServiceName);
      }
      ListIterator iter = containerOrdering.listIterator(containerOrdering.size());
      while (iter.hasPrevious())
      {
         Container con = (Container) iter.previous();
         ObjectName jmxName = con.getJmxName();
         int conState = con.getState();
         boolean destroyContainer = true;
         log.debug("Looking to destroy container: " + jmxName + ", state: " + con.getStateString() + ", destroy: "
               + destroyContainer);

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     * @param fieldName The name of the field
     * @return The depth for this field name
     */
    public int getObjectDepthForType(String fieldName)
    {
        ListIterator iter = fetchFieldNames.listIterator(fetchFieldNames.size()); // Start at the end
        int number = 0;
        while (iter.hasPrevious())
        {
            String field = (String)iter.previous();
            if (field.equals(fieldName))
            {
                number++;
            }
            else

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     */
    protected ScalarExpression(String functionName, List args)
    {
        st.append(functionName).append('(');
        ScalarExpression arg = null;
        ListIterator i = args.listIterator();
        Object expr = i.next();
        if (expr instanceof String)
        {
            st.append(expr.toString());
        }
        else
        {
            arg = (ScalarExpression)expr;
            st.append(arg);
        }




        while (i.hasNext())
        {
            expr = i.next();
            if (expr instanceof String)
            {
                st.append(',').append(expr.toString());
            }
            else

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     */
    protected ScalarExpression(String functionName, List args, List types)
    {
        st.append(functionName).append('(');


        ListIterator i = args.listIterator();
        ListIterator iTypes = types.listIterator();
        ScalarExpression arg = (ScalarExpression)i.next();
        st.append(arg);
        st.append(" AS ");
        Object type = iTypes.next();
        if (type instanceof ScalarExpression)
        {
            st.append((ScalarExpression)type);
        }
        else
        {
            st.append(type.toString());
        }
        this.qs = arg.qs;


        while (i.hasNext())
        {
            arg = (ScalarExpression)i.next();
            st.append(',').append(arg);
            st.append(" AS ");
            type = iTypes.next(); 
            if (type instanceof ScalarExpression)
            {
                st.append((ScalarExpression)type);
            }
            else

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        if (distinct)
        {
            st.append("DISTINCT ");
        }


        ListIterator i = args.listIterator();
        ScalarExpression arg = (ScalarExpression)i.next();
        te = arg.getLogicSetExpression(); //just delegate table expr to one arg.
        st.append(arg);


        while (i.hasNext())
        {
            arg = (ScalarExpression)i.next();
            st.append(',').append(arg);
        }


        st.append(')');
        this.expressionList.addExpression(this);

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      * or previous().
      * @param list List List to compare to fullView
      */
     public void nextAndPreviousTest( List list )
     {
       ListIterator listIter = list.listIterator();


       assertTrue( "hasNext", listIter.hasNext() );
       assertEquals( "next index", 0, listIter.nextIndex() );
       assertEquals( "next", fullView[0], listIter.next() );


       assertTrue( "hasNext", listIter.hasNext() );
       assertEquals( "next index", 1, listIter.nextIndex() );
       assertEquals( "next", fullView[1], listIter.next() );


       assertTrue( "hasNext", listIter.hasNext() );
       assertEquals( "next index", 2, listIter.nextIndex() );
       assertEquals( "next", fullView[2], listIter.next() );


       assertFalse( "hasNext", listIter.hasNext() );


       // We are at the end of the list. Go back
       assertTrue( "hasPrevious", listIter.hasPrevious() );
       assertEquals( "previous index", 2, listIter.previousIndex() );
       assertEquals( "previous", fullView[2], listIter.previous() );


       assertTrue( "hasPrevious", listIter.hasPrevious() );
       assertEquals( "previous index", 1, listIter.previousIndex() );
       assertEquals( "previous", fullView[1], listIter.previous() );


       assertTrue( "hasPrevious", listIter.hasPrevious() );
       assertEquals( "previous index", 0, listIter.previousIndex() );
       assertEquals( "previous", fullView[0], listIter.previous() );


       assertFalse( "hasPrevious", listIter.hasPrevious() );
       assertEquals( "previous index", -1, listIter.previousIndex() );
     }

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      public void testNextAndPrevious()
      {
        List col = createFilterColl(middleView);
        assertEquals( "view list size", 3, col.size() );


        ListIterator listIter = col.listIterator();


        assertTrue( "hasNext", listIter.hasNext() );
        assertEquals( "next index", 0, listIter.nextIndex() );
        assertEquals( "next", fullView[0], listIter.next() );


        assertTrue( "hasNext", listIter.hasNext() );
        assertEquals( "next index", 1, listIter.nextIndex() );
        assertEquals( "next", fullView[1], listIter.next() );


        assertTrue( "hasNext", listIter.hasNext() );
        assertEquals( "next index", 2, listIter.nextIndex() );
        assertEquals( "next", fullView[2], listIter.next() );


        assertFalse( "hasNext", listIter.hasNext() );


        // We are at the end of the list. Go back
        assertTrue( "hasPrevious", listIter.hasPrevious() );
        assertEquals( "previous index", 2, listIter.previousIndex() );
        assertEquals( "previous", fullView[2], listIter.previous() );


        assertTrue( "hasPrevious", listIter.hasPrevious() );
        assertEquals( "previous index", 1, listIter.previousIndex() );
        assertEquals( "previous", fullView[1], listIter.previous() );


        assertTrue( "hasPrevious", listIter.hasPrevious() );
        assertEquals( "previous index", 0, listIter.previousIndex() );
        assertEquals( "previous", fullView[0], listIter.previous() );


        assertFalse( "hasPrevious", listIter.hasPrevious() );
        assertEquals( "previous index", -1, listIter.previousIndex() );
       }

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