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
020package org.crsh.shell.impl.command.pipeline;
021
022import org.crsh.command.CommandContext;
023import org.crsh.command.ScriptException;
024import org.crsh.io.Filter;
025import org.crsh.text.Chunk;
026
027import java.io.IOException;
028import java.util.Map;
029
030/** @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a> */
031class PipeLineElement<C, P> implements Filter<C, P, CommandContext<P>>, CommandContext<C> {
032
033  /** . */
034  protected CommandContext<P> context;
035
036  /** . */
037  final Filter<C, P, CommandContext<P>> command;
038
039  /** . */
040  final Class<C> consumedType;
041
042
043  PipeLineElement(Filter<C, P, CommandContext<P>> command) {
044    this.command = command;
045    this.consumedType = command.getConsumedType();
046  }
047
048  public final boolean takeAlternateBuffer() throws IOException {
049    return context.takeAlternateBuffer();
050  }
051
052  public final boolean releaseAlternateBuffer() throws IOException {
053    return context.releaseAlternateBuffer();
054  }
055
056  public final String getProperty(String propertyName) {
057    return context.getProperty(propertyName);
058  }
059
060  public final String readLine(String msg, boolean echo) throws IOException, InterruptedException {
061    return context.readLine(msg, echo);
062  }
063
064  public final int getWidth() {
065    return context.getWidth();
066  }
067
068  public final int getHeight() {
069    return context.getHeight();
070  }
071
072  public Map<String, Object> getSession() {
073    return context.getSession();
074  }
075
076  public Map<String, Object> getAttributes() {
077    return context.getAttributes();
078  }
079
080  public boolean isPiped() {
081    return context.isPiped();
082  }
083
084  public Class<P> getProducedType() {
085    return command.getProducedType();
086  }
087
088  public Class<C> getConsumedType() {
089    return command.getConsumedType();
090  }
091
092  public void open(CommandContext<P> consumer) {
093    this.context = consumer;
094    this.command.open(consumer);
095  }
096
097  public void write(Chunk chunk) throws IOException {
098    if (consumedType.isInstance(chunk)) {
099      provide(consumedType.cast(chunk));
100    } else {
101      context.write(chunk);
102    }
103  }
104
105  public void provide(C element) throws IOException {
106    command.provide(element);
107  }
108
109  public void flush() throws IOException {
110    command.flush();
111  }
112
113  public void close() throws ScriptException, IOException {
114    command.close();
115  }
116}