/*
* 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.cli.impl.parser;
import org.crsh.cli.descriptor.CommandDescriptor;
import org.crsh.cli.impl.tokenizer.Tokenizer;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.NoSuchElementException;
public final class Parser<T> implements Iterator<Event> {
/** . */
private final Tokenizer tokenizer;
/** . */
private final Mode mode;
/** . */
private CommandDescriptor<T> command;
/** . */
private Status status;
/** . */
private final LinkedList<Event> next;
public Parser(Tokenizer tokenizer, CommandDescriptor<T> command, Mode mode) {
this.tokenizer = tokenizer;
this.command = command;
this.status = new Status.ReadingOption();
this.mode = mode;
this.next = new LinkedList<Event>();
}
Status getStatus() {
return status;
}
public boolean hasNext() {
if (next.isEmpty()) {
determine();
}
return next.size() > 0;
}
public Event next() {
if (!hasNext()) {
throw new NoSuchElementException();
}
return next.removeFirst();
}
public void remove() {
throw new UnsupportedOperationException();
}
private void determine() {
while (next.isEmpty()) {
Status.Response<T> nextStatus = status.process(new Status.Request<T>(mode, tokenizer, command));
if (nextStatus.status != null) {
this.status = nextStatus.status;
}
if (nextStatus.events != null) {
next.addAll(nextStatus.events);
}
if (nextStatus.command != null) {
command = (CommandDescriptor<T>)nextStatus.command;
}
}
}
}