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.shell.impl.command;
021
022 import org.crsh.command.CommandInvoker;
023 import org.crsh.command.NoSuchCommandException;
024 import org.crsh.command.ShellCommand;
025 import org.crsh.text.Chunk;
026
027 import java.util.LinkedList;
028 import java.util.regex.Pattern;
029
030 /**
031 * A factory for a pipeline.
032 */
033 public class PipeLineFactory {
034
035 /** . */
036 final String line;
037
038 /** . */
039 final String name;
040
041 /** . */
042 final String rest;
043
044 /** . */
045 final PipeLineFactory next;
046
047 public String getLine() {
048 return line;
049 }
050
051 PipeLineFactory(String line, PipeLineFactory next) {
052
053 Pattern p = Pattern.compile("^\\s*(\\S+)");
054 java.util.regex.Matcher m = p.matcher(line);
055 String name = null;
056 String rest = null;
057 if (m.find()) {
058 name = m.group(1);
059 rest = line.substring(m.end());
060 }
061
062 //
063 this.name = name;
064 this.rest = rest;
065 this.line = line;
066 this.next = next;
067 }
068
069 public CommandInvoker<Void, Chunk> create(CRaSHSession session) throws NoSuchCommandException {
070
071 //
072 LinkedList<CommandInvoker> pipes = new LinkedList<CommandInvoker>();
073 for (PipeLineFactory current = this;current != null;current = current.next) {
074 CommandInvoker commandInvoker = null;
075 if (current.name != null) {
076 ShellCommand command = session.crash.getCommand(current.name);
077 if (command != null) {
078 commandInvoker = command.resolveInvoker(current.rest);
079 }
080 }
081 if (commandInvoker == null) {
082 throw new NoSuchCommandException(current.name);
083 }
084 pipes.add(commandInvoker);
085 }
086
087 //
088 return new PipeLine(pipes.toArray(new CommandInvoker[pipes.size()]));
089 }
090
091 PipeLineFactory getLast() {
092 if (next != null) {
093 return next.getLast();
094 }
095 return this;
096 }
097 }