001 /* 002 * Copyright (C) 2012 eXo Platform SAS. 003 * 004 * This is free software; you can redistribute it and/or modify it 005 * under the terms of the GNU Lesser General Public License as 006 * published by the Free Software Foundation; either version 2.1 of 007 * the License, or (at your option) any later version. 008 * 009 * This software is distributed in the hope that it will be useful, 010 * but WITHOUT ANY WARRANTY; without even the implied warranty of 011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 012 * Lesser General Public License for more details. 013 * 014 * You should have received a copy of the GNU Lesser General Public 015 * License along with this software; if not, write to the Free 016 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 017 * 02110-1301 USA, or see the FSF site: http://www.fsf.org. 018 */ 019 020 package org.crsh.cli.impl.parser; 021 022 import org.crsh.cli.descriptor.CommandDescriptor; 023 import org.crsh.cli.impl.Delimiter; 024 import org.crsh.cli.impl.tokenizer.Tokenizer; 025 026 import java.util.Iterator; 027 import java.util.LinkedList; 028 import java.util.NoSuchElementException; 029 030 public final class Parser<T> implements Iterator<Event> { 031 032 /** . */ 033 private final Tokenizer tokenizer; 034 035 /** . */ 036 private final String mainName; 037 038 /** . */ 039 private final Mode mode; 040 041 /** . */ 042 private CommandDescriptor<T> command; 043 044 /** . */ 045 private Status status; 046 047 /** . */ 048 private final LinkedList<Event> next; 049 050 public Parser(Tokenizer tokenizer, CommandDescriptor<T> command, String mainName, Mode mode) { 051 this.tokenizer = tokenizer; 052 this.command = command; 053 this.mainName = mainName; 054 this.status = new Status.ReadingOption(); 055 this.mode = mode; 056 this.next = new LinkedList<Event>(); 057 } 058 059 Status getStatus() { 060 return status; 061 } 062 063 public Delimiter getDelimiter() { 064 return tokenizer.getDelimiter(); 065 } 066 067 public boolean hasNext() { 068 if (next.isEmpty()) { 069 determine(); 070 } 071 return next.size() > 0; 072 } 073 074 public Event next() { 075 if (!hasNext()) { 076 throw new NoSuchElementException(); 077 } 078 return next.removeFirst(); 079 } 080 081 public void remove() { 082 throw new UnsupportedOperationException(); 083 } 084 085 private void determine() { 086 while (next.isEmpty()) { 087 Status.Response<T> nextStatus = status.process(new Status.Request<T>(mode, mainName, tokenizer, command)); 088 if (nextStatus.status != null) { 089 this.status = nextStatus.status; 090 } 091 if (nextStatus.events != null) { 092 next.addAll(nextStatus.events); 093 } 094 if (nextStatus.command != null) { 095 command = (CommandDescriptor<T>)nextStatus.command; 096 } 097 } 098 } 099 }