/*
* Copyright (C) 2012 eXo Platform SAS.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.crsh.lang.impl.script;
import org.crsh.shell.ErrorKind;
import org.crsh.shell.impl.command.ShellSession;
import org.crsh.shell.impl.command.spi.Command;
import org.crsh.shell.impl.command.spi.CommandException;
import org.crsh.shell.impl.command.spi.CommandInvoker;
import org.crsh.shell.impl.command.pipeline.PipeLine;
import java.util.LinkedList;
import java.util.regex.Pattern;
/**
* A factory for a pipeline.
*/
public class PipeLineFactory {
/** . */
private static final Pattern p = Pattern.compile("^\\s*(\\S+)");
/** . */
final String line;
/** . */
final String name;
/** . */
final String rest;
/** . */
final PipeLineFactory next;
/**
* Create a pipeline factory for the specified line and next factory
*
* @param line the line
* @param next the next factory
* @throws CommandException when the line is not correct
*/
public PipeLineFactory(String line, PipeLineFactory next) throws CommandException {
java.util.regex.Matcher m = p.matcher(line);
if (m.find()) {
this.name = m.group(1);
this.rest = line.substring(m.end());
this.line = line;
this.next = next;
} else {
StringBuilder sb = new StringBuilder("syntax error near unexpected token");
if (next != null) {
sb.append(' ');
for (PipeLineFactory factory = next;factory != null;factory = factory.next) {
sb.append('|').append(factory.line);
}
}
throw new CommandException(ErrorKind.SYNTAX, sb.toString());
}
}
public String getLine() {
return line;
}
public PipeLineFactory getNext() {
return next;
}
public CommandInvoker<Void, Object> create(ShellSession session) throws CommandNotFoundException, CommandException {
LinkedList<CommandInvoker> pipes = new LinkedList<CommandInvoker>();
for (PipeLineFactory current = this;current != null;current = current.next) {
Command<?> command = session.getCommand(current.name);
if (command == null) {
throw new CommandNotFoundException(current.name);
}
CommandInvoker commandInvoker = command.resolveInvoker(current.rest);
if (commandInvoker == null) {
throw new CommandNotFoundException(current.name);
}
pipes.add(commandInvoker);
}
return new PipeLine(pipes.toArray(new CommandInvoker[pipes.size()]));
}
public PipeLineFactory getLast() {
if (next != null) {
return next.getLast();
}
return this;
}
}