| /* GiopNamingEnumeration.java -- handles corbaname: urls |
| Copyright (C) 2006 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package gnu.javax.naming.giop; |
| |
| import java.util.NoSuchElementException; |
| |
| import javax.naming.NamingEnumeration; |
| import javax.naming.NamingException; |
| |
| import org.omg.CosNaming.Binding; |
| import org.omg.CosNaming.BindingIterator; |
| import org.omg.CosNaming.BindingIteratorHolder; |
| import org.omg.CosNaming.BindingListHolder; |
| |
| /** |
| * Iterates over name class pairs, obtaining values first from the binding list |
| * and then from the binding iterator. |
| * |
| * @author Audrius Meskauskas |
| */ |
| public abstract class GiopNamingEnumeration implements NamingEnumeration |
| { |
| /** |
| * The array of bindings, returned at once. |
| */ |
| Binding[] list; |
| |
| /** |
| * The binding iterator to obtain the subsequent bindings. May be null, |
| * if all values are stored in the <code>list</code>. |
| */ |
| BindingIterator iterator; |
| |
| /** |
| * The batch size. |
| */ |
| int batch; |
| |
| /** |
| * The position of the element in the binding list, that must be returned |
| * during the subsequent call of the next(). If this field is grater or equal |
| * to the lenght of the list, the subsequent values must be requested from the |
| * iterator. |
| */ |
| int p; |
| |
| GiopNamingEnumeration(BindingListHolder bh, BindingIteratorHolder bih, int batchSize) |
| { |
| list = bh.value; |
| iterator = bih.value; |
| batch = batchSize; |
| } |
| |
| /** |
| * Convert from the CORBA binding into that this enumeration should return. |
| * |
| * @param binding |
| * the binding to convert |
| * @return the value, that must be returned by the {@link #next()}. |
| */ |
| public abstract Object convert(Binding binding); |
| |
| public void close() throws NamingException |
| { |
| if (iterator != null) |
| { |
| iterator.destroy(); |
| iterator = null; |
| } |
| } |
| |
| /** |
| * Checks if there are more elements to return. |
| * |
| * @throws NamingException |
| * never |
| */ |
| public boolean hasMore() throws NamingException |
| { |
| return hasMoreElements(); |
| } |
| |
| /** |
| * Returns the next element. |
| * |
| * @throws NamingException |
| * never |
| */ |
| public Object next() throws NamingException |
| { |
| return nextElement(); |
| } |
| |
| /** |
| * Checks if there are more elements to return. |
| */ |
| public boolean hasMoreElements() |
| { |
| if (p < 0) |
| return false; |
| else if (p < list.length) |
| return true; |
| else |
| return getMore(); |
| } |
| |
| /** |
| * Returns the next element. |
| */ |
| public Object nextElement() |
| { |
| if (p < 0) |
| throw new NoSuchElementException(); |
| else if (p < list.length) |
| return convert(list[p++]); |
| else if (getMore()) |
| // getMore updates p |
| return convert(list[p++]); |
| else |
| throw new NoSuchElementException(); |
| } |
| |
| /** |
| * Tries to obtain more elements, return true on success. Updates the fields |
| * accordingly. |
| */ |
| boolean getMore() |
| { |
| if (iterator != null) |
| { |
| BindingListHolder holder = new BindingListHolder(); |
| boolean rt = iterator.next_n(batch, holder); |
| if (rt) |
| { |
| // The new pack of the bindings arrived. |
| p = 0; |
| list = holder.value; |
| return true; |
| } |
| else |
| { |
| iterator.destroy(); |
| iterator = null; |
| p = -1; |
| return false; |
| } |
| } |
| else |
| return false; |
| } |
| } |