| /* |
| * 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.openjpa.lib.rop; |
| |
| import java.util.List; |
| |
| import org.apache.commons.lang.exception.NestableRuntimeException; |
| import org.apache.openjpa.lib.util.Closeable; |
| |
| /** |
| * A result object provider wrapped around a normal list. |
| * |
| * @author Abe White |
| */ |
| public class ListResultObjectProvider implements ResultObjectProvider { |
| |
| private final List _list; |
| private int _idx = -1; |
| |
| /** |
| * Constructor. Supply delegate. |
| */ |
| public ListResultObjectProvider(List list) { |
| _list = list; |
| } |
| |
| public List getDelegate() { |
| return _list; |
| } |
| |
| public boolean supportsRandomAccess() { |
| return true; |
| } |
| |
| public void open() throws Exception { |
| } |
| |
| public Object getResultObject() throws Exception { |
| return _list.get(_idx); |
| } |
| |
| public boolean next() throws Exception { |
| return absolute(_idx + 1); |
| } |
| |
| public boolean absolute(int pos) throws Exception { |
| if (pos >= 0 && pos < _list.size()) { |
| _idx = pos; |
| return true; |
| } |
| return false; |
| } |
| |
| public int size() throws Exception { |
| return _list.size(); |
| } |
| |
| public void reset() throws Exception { |
| _idx = -1; |
| } |
| |
| public void close() throws Exception { |
| if (_list instanceof Closeable) |
| try { |
| ((Closeable) _list).close(); |
| } catch (Exception e) { |
| } |
| } |
| |
| public void handleCheckedException(Exception e) { |
| // shouldn't ever happen |
| throw new NestableRuntimeException(e); |
| } |
| } |