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1: /* 2: * LineIterator.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.Iterator; 43: import java.util.NoSuchElementException; 44: 45: /** 46: * An iterator over an NNTP multi-line response. 47: * 48: * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a> 49: */ 50: public class LineIterator 51: implements Iterator, PendingData 52: { 53: 54: static final String DOT = "."; 55: 56: boolean doneRead = false; 57: NNTPConnection connection; 58: String current; 59: 60: LineIterator(NNTPConnection connection) 61: { 62: this.connection = connection; 63: } 64: 65: void doRead() 66: throws IOException 67: { 68: if (doneRead) 69: { 70: return; 71: } 72: String line = connection.read(); 73: if (DOT.equals(line)) 74: { 75: current = null; 76: } 77: else 78: { 79: current = line; 80: } 81: doneRead = true; 82: } 83: 84: /** 85: * Indicates whether there are more lines to be read. 86: */ 87: public boolean hasNext() 88: { 89: try 90: { 91: doRead(); 92: } 93: catch (IOException e) 94: { 95: return false; 96: } 97: return(current != null); 98: } 99: 100: /** 101: * Returns the next line. 102: */ 103: public Object next() 104: { 105: try 106: { 107: return nextLine(); 108: } 109: catch (IOException e) 110: { 111: throw new NoSuchElementException("I/O error: " + e.getMessage()); 112: } 113: } 114: 115: /** 116: * Returns the next line. 117: */ 118: public String nextLine() 119: throws IOException 120: { 121: doRead(); 122: if (current == null) 123: { 124: throw new NoSuchElementException(); 125: } 126: doneRead = false; 127: return current; 128: } 129: 130: /** 131: * This iterator is read-only. 132: */ 133: public void remove() 134: { 135: throw new UnsupportedOperationException(); 136: } 137: 138: /** 139: * Read to the end of this iterator. 140: */ 141: public void readToEOF() 142: throws IOException 143: { 144: do 145: { 146: doRead(); 147: } 148: while (current != null); 149: } 150: 151: }