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1: /* 2: * GroupIterator.java 3: * Copyright (C) 2002 The Free Software Foundation 4: * 5: * This file is part of GNU inetlib, a library. 6: * 7: * GNU inetlib is free software; you can redistribute it and/or modify 8: * it under the terms of the GNU General Public License as published by 9: * the Free Software Foundation; either version 2 of the License, or 10: * (at your option) any later version. 11: * 12: * GNU inetlib is distributed in the hope that it will be useful, 13: * but WITHOUT ANY WARRANTY; without even the implied warranty of 14: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15: * GNU General Public License for more details. 16: * 17: * You should have received a copy of the GNU General Public License 18: * along with this library; if not, write to the Free Software 19: * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20: * 21: * Linking this library statically or dynamically with other modules is 22: * making a combined work based on this library. Thus, the terms and 23: * conditions of the GNU General Public License cover the whole 24: * combination. 25: * 26: * As a special exception, the copyright holders of this library give you 27: * permission to link this library with independent modules to produce an 28: * executable, regardless of the license terms of these independent 29: * modules, and to copy and distribute the resulting executable under 30: * terms of your choice, provided that you also meet, for each linked 31: * independent module, the terms and conditions of the license of that 32: * module. An independent module is a module which is not derived from 33: * or based on this library. If you modify this library, you may extend 34: * this exception to your version of the library, but you are not 35: * obliged to do so. If you do not wish to do so, delete this 36: * exception statement from your version. 37: */ 38: 39: package gnu.inet.nntp; 40: 41: import java.io.IOException; 42: import java.util.NoSuchElementException; 43: 44: /** 45: * An iterator over an NNTP newsgroup listing. 46: * 47: * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a> 48: */ 49: public class GroupIterator 50: extends LineIterator 51: { 52: 53: static final String CAN_POST = "y"; 54: 55: GroupIterator(NNTPConnection connection) 56: { 57: super(connection); 58: } 59: 60: /** 61: * Returns the next group. 62: */ 63: public Object next() 64: { 65: try 66: { 67: return nextGroup(); 68: } 69: catch (IOException e) 70: { 71: throw new NoSuchElementException("I/O error: " + e.getMessage()); 72: } 73: } 74: 75: /** 76: * Returns the next group. 77: */ 78: public Group nextGroup() 79: throws IOException 80: { 81: String line = nextLine(); 82: 83: // Parse line 84: int start = 0, end; 85: end = line.indexOf(' ', start); 86: String name = line.substring(start, end); 87: start = end + 1; 88: end = line.indexOf(' ', start); 89: int last = Integer.parseInt(line.substring(start, end)); 90: start = end + 1; 91: end = line.indexOf(' ', start); 92: int first = Integer.parseInt(line.substring(start, end)); 93: start = end + 1; 94: boolean canPost = CAN_POST.equals(line.substring(start)); 95: 96: return new Group(name, last, first, canPost); 97: } 98: 99: }