org.crsh.command.pipeline.PipeLineElement Maven / Gradle / Ivy

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/*
 * 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.command.pipeline;

import org.crsh.command.CommandContext;
import org.crsh.command.ScriptException;
import org.crsh.io.Filter;
import org.crsh.text.Chunk;

import java.io.IOException;
import java.util.Map;

/** @author Julien Viet */
class PipeLineElement implements Filter>, CommandContext {

  /** . */
  protected CommandContext context;

  /** . */
  final Filter> command;

  /** . */
  final Class consumedType;


  PipeLineElement(Filter> command) {
    this.command = command;
    this.consumedType = command.getConsumedType();
  }

  public final boolean takeAlternateBuffer() throws IOException {
    return context.takeAlternateBuffer();
  }

  public final boolean releaseAlternateBuffer() throws IOException {
    return context.releaseAlternateBuffer();
  }

  public final String getProperty(String propertyName) {
    return context.getProperty(propertyName);
  }

  public final String readLine(String msg, boolean echo) {
    return context.readLine(msg, echo);
  }

  public final int getWidth() {
    return context.getWidth();
  }

  public final int getHeight() {
    return context.getHeight();
  }

  public Map getSession() {
    return context.getSession();
  }

  public Map getAttributes() {
    return context.getAttributes();
  }

  public boolean isPiped() {
    return context.isPiped();
  }

  public Class
 getProducedType() {
    return command.getProducedType();
  }

  public Class getConsumedType() {
    return command.getConsumedType();
  }

  public void open(CommandContext consumer) {
    this.context = consumer;
    this.command.open(consumer);
  }

  public void write(Chunk chunk) throws IOException {
    if (consumedType.isInstance(chunk)) {
      provide(consumedType.cast(chunk));
    } else {
      context.write(chunk);
    }
  }

  public void provide(C element) throws IOException {
    command.provide(element);
  }

  public void flush() throws IOException {
    command.flush();
  }

  public void close() throws ScriptException, IOException {
    command.close();
  }
}