| /* |
| * $Id$ |
| * |
| * Copyright 2006 The Apache Software Foundation. |
| * |
| * Licensed 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.struts2.util; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.Comparator; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| import org.apache.commons.logging.LogFactory; |
| |
| import com.opensymphony.xwork2.Action; |
| |
| |
| /** |
| * A bean that takes a source and comparator then attempt to sort the source |
| * utilizing the comparator. It is being used in SortIteratorTag. |
| * |
| * @see org.apache.struts2.views.jsp.iterator.SortIteratorTag |
| */ |
| public class SortIteratorFilter extends IteratorFilterSupport implements Iterator, Action { |
| |
| Comparator comparator; |
| Iterator iterator; |
| List list; |
| |
| // Attributes ---------------------------------------------------- |
| Object source; |
| |
| |
| public void setComparator(Comparator aComparator) { |
| this.comparator = aComparator; |
| } |
| |
| public List getList() { |
| return list; |
| } |
| |
| // Public -------------------------------------------------------- |
| public void setSource(Object anIterator) { |
| source = anIterator; |
| } |
| |
| // Action implementation ----------------------------------------- |
| public String execute() { |
| if (source == null) { |
| return ERROR; |
| } else { |
| try { |
| if (!MakeIterator.isIterable(source)) { |
| LogFactory.getLog(SortIteratorFilter.class.getName()).warn("Cannot create SortIterator for source " + source); |
| |
| return ERROR; |
| } |
| |
| list = new ArrayList(); |
| |
| Iterator i = MakeIterator.convert(source); |
| |
| while (i.hasNext()) { |
| list.add(i.next()); |
| } |
| |
| // Sort it |
| Collections.sort(list, comparator); |
| iterator = list.iterator(); |
| |
| return SUCCESS; |
| } catch (Exception e) { |
| LogFactory.getLog(SortIteratorFilter.class.getName()).warn("Error creating sort iterator.", e); |
| |
| return ERROR; |
| } |
| } |
| } |
| |
| // Iterator implementation --------------------------------------- |
| public boolean hasNext() { |
| return (source == null) ? false : iterator.hasNext(); |
| } |
| |
| public Object next() { |
| return iterator.next(); |
| } |
| |
| public void remove() { |
| throw new UnsupportedOperationException("Remove is not supported in SortIteratorFilter."); |
| } |
| } |