/*
* Copyright (c) 2001 Sun Microsystems, Inc. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Sun Microsystems, Inc. for Project JXTA."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Sun", "Sun Microsystems, Inc.", "JXTA" and "Project JXTA" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact Project JXTA at http://www.jxta.org.
*
* 5. Products derived from this software may not be called "JXTA",
* nor may "JXTA" appear in their name, without prior written
* permission of Sun.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL SUN MICROSYSTEMS OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of Project JXTA. For more
* information on Project JXTA, please see
* <http://www.jxta.org/.
*
* This license is based on the BSD license adopted by the Apache Foundation.
*
* $Id: more.java,v 1.19 2007/02/09 23:12:50 hamada Exp $
*/
package net.jxta.impl.shell.bin.more;
import net.jxta.document.AdvertisementFactory;
import net.jxta.id.IDFactory;
import net.jxta.impl.shell.GetOpt;
import net.jxta.impl.shell.ShellApp;
import net.jxta.impl.shell.ShellEnv;
import net.jxta.impl.shell.ShellObject;
import net.jxta.peergroup.PeerGroup;
import net.jxta.pipe.InputPipe;
import net.jxta.pipe.OutputPipe;
import net.jxta.pipe.PipeService;
import net.jxta.protocol.PipeAdvertisement;
import java.io.IOException;
import java.util.Collections;
import java.util.StringTokenizer;
/**
* Pages through output.
*/
public class more extends ShellApp {
private final static int MAX_CONSOLE = 20;
private int count = 0;
/**
* {@inheritDoc}
*/
public int startApp(final String[] args) {
ShellEnv env = getEnv();
try {
GetOpt options = new GetOpt(args, 0, "p");
while (true) {
//FIXME this does not loop
int option;
try {
option = options.getNextOption();
} catch (IllegalArgumentException badopt) {
consoleMessage("Illegal argument :" + badopt);
return syntaxError();
}
if (-1 == option) {
break;
}
switch (option) {
default:
consoleMessage("Unrecognized option");
return syntaxError();
}
}
String name = options.getNextParameter();
if ((null != name) && (null != options.getNextParameter())) {
consoleMessage("Unsupported parameter");
return syntaxError();
}
if (null != name) {
ShellObject obj = env.get(name);
if (obj == null) {
consoleMessage("Cannot access '" + name + "'");
return ShellApp.appMiscError;
}
ShellEnv catEnv = new ShellEnv(env);
PeerGroup current = (PeerGroup) getEnv().get("stdgroup").getObject();
PipeService pipes = current.getPipeService();
/*
* create pipe to link the two
*/
PipeAdvertisement padv;
try {
padv = (PipeAdvertisement)
AdvertisementFactory.newAdvertisement(
PipeAdvertisement.getAdvertisementType());
padv.setPipeID(IDFactory.newPipeID(current.getPeerGroupID()));
padv.setType(PipeService.UnicastType);
InputPipe inpipe = pipes.createInputPipe(padv);
setInputPipe(inpipe);
env.add("stdin", new ShellObject<InputPipe>("Default InputPipe", inpipe));
OutputPipe outpipe = pipes.createOutputPipe(padv, Collections.singleton(getGroup().getPeerID()), 1000);
catEnv.add("stdout", new ShellObject<OutputPipe>("Default OutputPipe", outpipe));
} catch (IOException ex) {
printStackTrace("Could not construct pipes for piped command.", ex);
}
final ShellApp chainCat = loadApp(null, "cat", catEnv);
Thread catThread = new Thread() {
@Override
public void run() {
exec(chainCat, args);
}
};
setJoinedThread(catThread);
catThread.start();
}
moreStdin();
return ShellApp.appNoError;
} catch (Exception ex) {
printStackTrace("Error processing commands", ex);
return ShellApp.appMiscError;
}
}
private void moreStdin() {
do {
String entry = null;
try {
entry = waitForInput();
} catch (IOException failed) {
printStackTrace("whoops", failed);
}
if (entry == null)
break;
pagein(entry);
} while (true);
}
private void pagein(String data) {
StringTokenizer tokens = new StringTokenizer(data, "\n");
while (tokens.hasMoreElements()) {
println(tokens.nextToken());
count++;
if (count >= MAX_CONSOLE) {
// reset the counter since we exited
count = 0;
print("-----More-----");
String entry = null;
try {
entry = consWaitForInput();
} catch (IOException failed) {
//ignored
}
if ((entry == null) || entry.equals("q"))
return;
}
}
}
/**
* {@inheritDoc}
*/
@Override
public String getDescription() {
return "Page through a Shell object or from standard input.";
}
private int syntaxError() {
consoleMessage("more [-p] [<env>]");
return ShellApp.appParamError;
}
/**
* {@inheritDoc}
*/
@Override
public void help() {
println("NAME");
println(" more - " + getDescription());
println(" ");
println("SYNOPSIS");
println(" ");
println(" more [-p] [<env>]");
println(" ");
println("OPTIONS");
println(" ");
println(" [-p] Pretty print the object.");
println(" ");
println("PARAMETERS");
println(" ");
println(" <env> The environment variable to print.");
println(" ");
println("DESCRIPTION");
println(" ");
println("'more' is a Shell command that pages through the content ");
println("of an object stored in environment variable. The name of the");
println("is provided as an argument. If no argument is supplied, the");
println("command takes its input from the 'stdin' shell pipe.");
println(" ");
println("EXAMPLE");
println(" ");
println(" JXTA> cat myfile | more");
println(" ");
println("This command pipes the content of the variable 'myfile' into the");
println("'more' command and displays it to the Shell console.");
println(" ");
println("SEE ALSO");
println(" ");
println(" cat env");
println(" ");
}
}