/******************************************************************************
* Copyright (c) 2006, 2010 VMware Inc.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* and Apache License v2.0 which accompanies this distribution.
* The Eclipse Public License is available at
* http://www.eclipse.org/legal/epl-v10.html and the Apache License v2.0
* is available at http://www.opensource.org/licenses/apache2.0.php.
* You may elect to redistribute this code under either of these licenses.
*
* Contributors:
* VMware Inc.
*****************************************************************************/
package org.eclipse.gemini.blueprint.service.importer.support.internal.collection;
import java.util.Collection;
import java.util.List;
import java.util.ListIterator;
import java.util.RandomAccess;
import org.eclipse.gemini.blueprint.service.importer.support.internal.aop.ServiceProxyCreator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.Filter;
/**
* OSGi service dynamic collection - allows iterating while the underlying storage is being shrunk/expanded. This
* collection is read-only - its content is being retrieved dynamically from the OSGi platform.
*
* <p/> This collection and its iterators are thread-safe. That is, multiple threads can access the collection. However,
* since the collection is read-only, it cannot be modified by the client.
*
* @author Costin Leau
*
*/
public class OsgiServiceList extends OsgiServiceCollection implements List, RandomAccess {
protected class OsgiServiceListIterator implements ListIterator {
// dynamic iterator
private final ListIterator iter;
public OsgiServiceListIterator(int index) {
iter = storage.listIterator(index);
}
public Object next() {
return iter.next();
}
public Object previous() {
return iter.previous();
}
//
// index operations
//
public boolean hasNext() {
return iter.hasNext();
}
public boolean hasPrevious() {
return iter.hasPrevious();
}
public int nextIndex() {
return iter.nextIndex();
}
public int previousIndex() {
return iter.previousIndex();
}
//
// read-only operations
//
public void add(Object o) {
throw new UnsupportedOperationException();
}
public void remove() {
throw new UnsupportedOperationException();
}
public void set(Object o) {
throw new UnsupportedOperationException();
}
};
/**
* cast the collection to a specialized collection
*/
protected List storage;
public OsgiServiceList(Filter filter, BundleContext context, ClassLoader classLoader,
ServiceProxyCreator proxyCreator, boolean useServiceReference) {
super(filter, context, classLoader, proxyCreator, useServiceReference);
}
protected DynamicCollection createInternalDynamicStorage() {
storage = new DynamicList();
return (DynamicCollection) storage;
}
public Object get(int index) {
return storage.get(index);
}
public int indexOf(Object o) {
// FIXME: implement this
throw new UnsupportedOperationException();
}
public int lastIndexOf(Object o) {
// FIXME: implement this
throw new UnsupportedOperationException();
}
public ListIterator listIterator() {
return listIterator(0);
}
public ListIterator listIterator(final int index) {
return new OsgiServiceListIterator(index);
}
public List subList(int fromIndex, int toIndex) {
// FIXME: implement this
// note: the trick here is to return a list which is backed up by this
// one (i.e. read-only)
throw new UnsupportedOperationException();
}
//
// WRITE operations forbidden
//
public Object remove(int index) {
throw new UnsupportedOperationException();
}
public Object set(int index, Object o) {
throw new UnsupportedOperationException();
}
public void add(int index, Object o) {
throw new UnsupportedOperationException();
}
public boolean addAll(int index, Collection c) {
throw new UnsupportedOperationException();
}
}