/*
* 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.shell.impl.command.pipeline;
import org.crsh.command.CommandContext;
import org.crsh.shell.ErrorKind;
import org.crsh.shell.impl.command.spi.CommandException;
import org.crsh.shell.impl.command.spi.CommandInvoker;
import org.crsh.keyboard.KeyHandler;
import java.io.IOException;
public class PipeLine extends CommandInvoker<Void, Object> {
/** . */
private final CommandInvoker[] invokers;
/** . */
private CommandContext<?> current;
public PipeLine(CommandInvoker[] invokers) {
this.invokers = invokers;
this.current = null;
}
public Class<Void> getConsumedType() {
return Void.class;
}
public Class<Object> getProducedType() {
return Object.class;
}
public void open(CommandContext<? super Object> consumer) throws IOException, CommandException {
open(0, consumer);
}
private CommandContext open(final int index, final CommandContext last) throws IOException, CommandException {
if (index < invokers.length) {
//
final CommandInvoker invoker = invokers[index];
CommandContext next = open(index + 1, last);
//
Class produced = invoker.getProducedType();
Class<?> consumed = invoker.getConsumedType();
CommandInvokerAdapter filterContext = new CommandInvokerAdapter(invoker, consumed, produced);
try {
filterContext.open(next);
}
catch (Exception e) {
throw new CommandException(ErrorKind.EVALUATION, e);
}
// Save current filter in field
// so if anything wrong happens it will be closed
current = filterContext;
//
return filterContext;
} else {
current = last;
return last;
}
}
@Override
public KeyHandler getKeyHandler() {
for (CommandInvoker<?, ?> invoker : invokers) {
KeyHandler handler = invoker.getKeyHandler();
if (handler != null) {
return handler;
}
}
return null;
}
public void provide(Void element) throws IOException {
// Ignore
}
public void flush() throws IOException {
current.flush();
}
public void close() throws IOException, CommandException {
try {
current.close();
}
catch (Exception e) {
throw new CommandException(ErrorKind.EVALUATION, e);
}
}
}