tuwien.auto.calimero.serial.CommConnectionAdapter Maven / Gradle / Ivy
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/*
Calimero 2 - A library for KNX network access
Copyright (c) 2006, 2011 B. Malinowsky
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Linking this library statically or dynamically with other modules is
making a combined work based on this library. Thus, the terms and
conditions of the GNU General Public License cover the whole
combination.
As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
modules, and to copy and distribute the resulting executable under terms
of your choice, provided that you also meet, for each linked independent
module, the terms and conditions of the license of that module. An
independent module is a module which is not derived from or based on
this library. If you modify this library, you may extend this exception
to your version of the library, but you are not obligated to do so. If
you do not wish to do so, delete this exception statement from your
version.
*/
package tuwien.auto.calimero.serial;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.reflect.InvocationTargetException;
import tuwien.auto.calimero.exception.KNXException;
import tuwien.auto.calimero.log.LogService;
/**
* Adapter for Java ME CDC javax.microedition.io.CommConnection.
*
*
* @author B. Malinowsky
*/
class CommConnectionAdapter extends LibraryAdapter
{
private static final Class connector;
private Object conn;
private InputStream is;
private OutputStream os;
static {
Class clazz = null;
try {
clazz = Class.forName("javax.microedition.io.Connector");
}
catch (final ClassNotFoundException e) {}
connector = clazz;
}
CommConnectionAdapter(final LogService logger, final String portId, final int baudrate)
throws KNXException
{
super(logger);
if (!isAvailable())
throw new KNXException("no ME CDC environment, Connector factory missing");
open(portId, baudrate);
}
/**
* Returns whether the ME CDC Connector class is available or not, and therefore,
* checks if CommConnectionAdapter functionality can be used.
*
* This method does not check if the actual serial protocol connection is supported.
*
* @return true, if running in a ME CDC environment, and CommConnection
* can be queried, false otherwise
*/
static boolean isAvailable()
{
return connector != null;
}
/* (non-Javadoc)
* @see tuwien.auto.calimero.serial.LibraryAdapter#close()
*/
public void close() throws IOException
{
try {
invoke(conn, "close", null);
}
catch (final InvocationTargetException e) {
if (e.getCause() instanceof IOException)
throw (IOException) e.getCause();
}
catch (final Exception ignore) {}
}
/* (non-Javadoc)
* @see tuwien.auto.calimero.serial.LibraryAdapter#getInputStream()
*/
public InputStream getInputStream()
{
return is;
}
/* (non-Javadoc)
* @see tuwien.auto.calimero.serial.LibraryAdapter#getOutputStream()
*/
public OutputStream getOutputStream()
{
return os;
}
private void open(final String portID, final int baudrate) throws KNXException
{
Object cc = null;
try {
// query a CommConnection instance
cc = invoke(connector, "open", new String[] { "comm:" + portID + ";baudrate="
+ baudrate + ";bitsperchar=8;stopbits=1;parity=even;autocts=off;autorts=off" });
is = (InputStream) invoke(cc, "openInputStream", null);
os = (OutputStream) invoke(cc, "openOutputStream", null);
conn = cc;
return;
}
catch (final SecurityException e) {
logger.error("CommConnection access denied", e);
}
catch (final InvocationTargetException e) {
// usually, the cause will hold a ConnectionNotFoundException
logger.error("CommConnection: " + e.getCause().getMessage());
}
// NoSuchMethodException, IllegalAccessException, IllegalArgumentException
catch (final Exception e) {}
try {
invoke(cc, "close", null);
is.close();
os.close();
}
catch (final Exception mainlyNPE) {}
throw new KNXException("failed to open CommConnection");
}
}