Finished pipe implementation.

src/main/java/de/ailis/usb4java/jsr80/AbstractDevice.java

@@ -568,11 +568,21 @@ abstract class AbstractDevice implements UsbDevice
     @Override
     public final void syncSubmit(final UsbControlIrp irp) throws UsbException
     {
+        if( (irp.bRequest() == UsbConst.REQUEST_SET_CONFIGURATION) && (irp.bmRequestType() ==0) )
+        {
+            final int result2 = usb_set_configuration(open(), irp.wValue());
+            if (result2 < 0) throw new UsbException(usb_strerror());
+            return;
+        }
+
+
         USBLock.acquire();
         try
         {
             final ByteBuffer buffer = ByteBuffer
                     .allocateDirect(irp.getLength());
+            buffer.put(irp.getData(), 0, irp.getLength());
+            buffer.rewind();
             final USB_Dev_Handle handle = open();
             final int len = usb_control_msg(handle, irp.bmRequestType(),
                 irp.bRequest(),
@@ -580,11 +590,13 @@ abstract class AbstractDevice implements UsbDevice
             if (len < 0) throw new UsbException(usb_strerror());
             buffer.rewind();
             buffer.get(irp.getData(), 0, len);
+            irp.setActualLength(len);
         }
         finally
         {
             USBLock.release();
         }
+        irp.complete();
     }
 
 

src/main/java/de/ailis/usb4java/jsr80/LibUsbException.java

@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2011 Klaus Reimer <k@ailis.de>
+ * See LICENSE.txt for licensing information.
+ */
+
+package de.ailis.usb4java.jsr80;
+
+import static de.ailis.usb4java.USB.usb_strerror;
+
+import javax.usb.UsbException;
+
+
+/**
+ * libusb-specific UsbException.
+ *
+ * @author Klaus Reimer (k@ailis.de)
+ */
+
+public class LibUsbException extends UsbException
+{
+    /** Serial version UID. */
+    private static final long serialVersionUID = 1L;
+
+    /** The error code. */
+    private final int errorCode;
+
+
+    /**
+     * Constructor.
+     *
+     * @param errorCode
+     *            The error code.
+     */
+
+    public LibUsbException(final int errorCode)
+    {
+        super(String.format("USB error %i: %s", errorCode, usb_strerror()));
+        this.errorCode = errorCode;
+    }
+
+
+    /**
+     * Returns the error code.
+     *
+     * @return The error code
+     */
+
+    public int getErrorCode()
+    {
+        return this.errorCode;
+    }
+}

src/main/java/de/ailis/usb4java/jsr80/PipeQueueProcessor.java

@@ -0,0 +1,339 @@
+/*
+ * Copyright (C) 2011 Klaus Reimer <k@ailis.de>
+ * See LICENSE.txt for licensing information.
+ */
+
+package de.ailis.usb4java.jsr80;
+
+import static de.ailis.usb4java.USB.usb_bulk_read;
+import static de.ailis.usb4java.USB.usb_bulk_write;
+import static de.ailis.usb4java.USB.usb_interrupt_read;
+import static de.ailis.usb4java.USB.usb_interrupt_write;
+
+import java.nio.ByteBuffer;
+
+import javax.usb.UsbConst;
+import javax.usb.UsbEndpoint;
+import javax.usb.UsbEndpointDescriptor;
+import javax.usb.UsbException;
+import javax.usb.UsbIrp;
+
+import de.ailis.usb4java.USB_Dev_Handle;
+
+
+/**
+ * This thread is responsible for processing the request packet queue of a pipe.
+ * The thread is created and started when a pipe is opened and is stopped when
+ * the pipe is closed.
+ *
+ * @author Klaus Reimer (k@ailis.de)
+ */
+
+final class PipeQueueProcessor extends Thread
+{
+    /** The pipe. */
+    private final UsbPipeImpl pipe;
+
+    /** If thread should stop. */
+    private boolean stop;
+
+    /** If thread is running or not. */
+    private boolean running;
+
+    /** If packets are currently processed. */
+    private boolean processing;
+
+
+    /**
+     * Constructor.
+     *
+     * @param pipe
+     *            The pipe.
+     */
+
+    public PipeQueueProcessor(final UsbPipeImpl pipe)
+    {
+        this.pipe = pipe;
+        setDaemon(true);
+    }
+
+
+    /**
+     * Stops the thread.
+     */
+
+    public void shutdown()
+    {
+        this.stop = true;
+        notify();
+    }
+
+
+    /**
+     * Stops the thread and waits until it has really stopped.
+     */
+
+    public void shutdownAndWait()
+    {
+        shutdown();
+        while (isRunning())
+        {
+            try
+            {
+                wait();
+            }
+            catch (final InterruptedException e)
+            {
+                Thread.currentThread().interrupt();
+            }
+        }
+    }
+
+
+    /**
+     * Returns the USB endpoint descriptor.
+     *
+     * @return The USB endpoint descriptor.
+     */
+
+    private UsbEndpointDescriptor getEndpointDescriptor()
+    {
+        return this.pipe.getUsbEndpoint().getUsbEndpointDescriptor();
+    }
+
+
+    /**
+     * Returns the USB device.
+     *
+     * @return The USB device.
+     */
+
+    private AbstractDevice getDevice()
+    {
+        return this.pipe.getDevice();
+    }
+
+
+    /**
+     * Processes the specified request packet.
+     *
+     * @param irp
+     *            The request packet to process.
+     */
+
+    private void processIrp(final UsbIrp irp)
+    {
+        final UsbEndpoint endpoint = this.pipe.getUsbEndpoint();
+        final byte type = endpoint.getType();
+        final byte direction = endpoint.getDirection();
+        try
+        {
+            switch (type)
+            {
+                case UsbConst.ENDPOINT_TYPE_BULK:
+                    switch (direction)
+                    {
+                        case UsbConst.ENDPOINT_DIRECTION_OUT:
+                            irp.setActualLength(bulkWrite(irp.getData()));
+                            break;
+
+                        case UsbConst.ENDPOINT_DIRECTION_IN:
+                            irp.setActualLength(bulkRead(irp.getData()));
+                            break;
+                    }
+                    break;
+
+                case UsbConst.ENDPOINT_TYPE_INTERRUPT:
+                    switch (direction)
+                    {
+                        case UsbConst.ENDPOINT_DIRECTION_OUT:
+                            irp.setActualLength(interruptWrite(irp.getData()));
+                            break;
+
+                        case UsbConst.ENDPOINT_DIRECTION_IN:
+                            irp.setActualLength(interruptRead(irp.getData()));
+                            break;
+                    }
+                    break;
+            }
+
+            throw new UsbException("Unsupported endpoint type: " + type);
+        }
+        catch (final UsbException e)
+        {
+            irp.setUsbException(e);
+        }
+        irp.complete();
+    }
+
+
+    /**
+     * Reads bytes from a bulk endpoint into the specified data array.
+     *
+     * @param data
+     *            The data array to write the read bytes to.
+     * @throws UsbException
+     *             When transfer fails.
+     * @return The number of read bytes.
+     */
+
+    private int bulkRead(final byte[] data) throws UsbException
+    {
+        final UsbEndpointDescriptor descriptor = getEndpointDescriptor();
+        final int size =
+            Math.min(data.length, descriptor.wMaxPacketSize() & 0xffff);
+        final int ep = descriptor.bEndpointAddress();
+        final ByteBuffer buffer = ByteBuffer.allocateDirect(size);
+        final int result = usb_bulk_read(getDevice().open(), ep, buffer, 5000);
+        if (result < 0) throw new LibUsbException(result);
+        buffer.rewind();
+        buffer.get(data, 0, result);
+        return result;
+    }
+
+    /**
+     * Writes the specified bytes to a bulk endpoint.
+     *
+     * @param data
+     *            The data array with the bytes to write.
+     * @throws UsbException
+     *             When transfer fails.
+     * @return The number of written bytes.
+     */
+
+    private int bulkWrite(final byte[] data) throws UsbException
+    {
+        final UsbEndpointDescriptor descriptor = getEndpointDescriptor();
+        final int total = data.length;
+        final int size = Math.min(total, descriptor.wMaxPacketSize() & 0xffff);
+        final int ep = descriptor.bEndpointAddress();
+        final ByteBuffer buffer = ByteBuffer.allocateDirect(size);
+        final USB_Dev_Handle handle = getDevice().open();
+        int written = 0;
+        while (written < total)
+        {
+            buffer.put(data, written, Math.min(total - written, size));
+            buffer.rewind();
+            final int result = usb_bulk_write(handle, ep, buffer, 5000);
+            if (result < 0) throw new LibUsbException(result);
+            written += result;
+            buffer.rewind();
+        }
+        return written;
+    }
+
+
+    /**
+     * Reads bytes from an interrupt endpoint into the specified data array.
+     *
+     * @param data
+     *            The data array to write the read bytes to.
+     * @throws UsbException
+     *             When transfer fails.
+     * @return The number of read bytes.
+     */
+
+    private int interruptRead(final byte[] data) throws UsbException
+    {
+        final UsbEndpointDescriptor descriptor = getEndpointDescriptor();
+        final int size =
+            Math.min(data.length, descriptor.wMaxPacketSize() & 0xffff);
+        final int ep = descriptor.bEndpointAddress();
+        final ByteBuffer buffer = ByteBuffer.allocateDirect(size);
+        final int result =
+            usb_interrupt_read(getDevice().open(), ep, buffer, 5000);
+        if (result < 0) throw new LibUsbException(result);
+        buffer.rewind();
+        buffer.get(data, 0, result);
+        return result;
+    }
+
+
+    /**
+     * Writes the specified bytes to a interrupt endpoint.
+     *
+     * @param data
+     *            The data array with the bytes to write.
+     * @throws UsbException
+     *             When transfer fails.
+     * @return The number of written bytes.
+     */
+
+    private int interruptWrite(final byte[] data) throws UsbException
+    {
+        final UsbEndpointDescriptor descriptor = getEndpointDescriptor();
+        final int total = data.length;
+        final int size = Math.min(total, descriptor.wMaxPacketSize() & 0xffff);
+        final int ep = descriptor.bEndpointAddress();
+        final ByteBuffer buffer = ByteBuffer.allocateDirect(size);
+        final USB_Dev_Handle handle = getDevice().open();
+        int written = 0;
+        while (written < total)
+        {
+            buffer.put(data, written, Math.min(total - written, size));
+            buffer.rewind();
+            final int result = usb_interrupt_write(handle, ep, buffer, 5000);
+            if (result < 0) throw new LibUsbException(result);
+            written += result;
+            buffer.rewind();
+        }
+        return written;
+    }
+
+
+    /**
+     * @see java.lang.Runnable#run()
+     */
+
+    @Override
+    public void run()
+    {
+        this.running = true;
+        final UsbIrpQueue queue = this.pipe.getQueue();
+        while (!this.stop)
+        {
+            UsbIrp irp = queue.get();
+            while (!this.stop && irp != null)
+            {
+                this.processing = true;
+                processIrp(irp);
+                irp = queue.get();
+            }
+            this.processing = false;
+            try
+            {
+                wait();
+            }
+            catch (final InterruptedException e)
+            {
+                Thread.currentThread().interrupt();
+            }
+        }
+        this.running = false;
+        notify();
+    }
+
+
+    /**
+     * Checks if this thread is running.
+     *
+     * @return True if thread is running, false if not.
+     */
+
+    public boolean isRunning()
+    {
+        return this.running;
+    }
+
+
+    /**
+     * Checks if packets are currently processed.
+     *
+     * @return If packets are processed.
+     */
+
+    public boolean isProcessing()
+    {
+        return this.processing;
+    }
+}

src/main/java/de/ailis/usb4java/jsr80/UsbConfigurationImpl.java

@@ -84,7 +84,7 @@ public final class UsbConfigurationImpl implements UsbConfiguration
                     this.interfaces.put(ifaceNumber, settings);
                 }
                 final UsbInterface usbInterface = new UsbInterfaceImpl(this,
-                    desc);
+                    desc, device);
 
                 // If we have no active setting for current interface number
                 // yet or the alternate setting number is 0 (which marks the
@@ -92,7 +92,10 @@ public final class UsbConfigurationImpl implements UsbConfiguration
                 // the active setting.
                 if (!this.activeSettings.containsKey(ifaceNumber) ||
                         desc.bAlternateSetting() == 0)
+                {
                     this.activeSettings.put(ifaceNumber, usbInterface);
+                    System.out.println("Active: " + usbInterface);
+                }
 
                 // Add the interface to the settings list
                 settings.put(settingNumber, usbInterface);
@@ -160,7 +163,7 @@ public final class UsbConfigurationImpl implements UsbConfiguration
     @Override
     public UsbInterface getUsbInterface(final byte number)
     {
-        return this.activeSettings.get(number);
+        return this.activeSettings.get((int) number);
     }
 
 

src/main/java/de/ailis/usb4java/jsr80/UsbEndpointImpl.java

@@ -0,0 +1,106 @@
+/*
+ * Copyright (C) 2011 Klaus Reimer <k@ailis.de>
+ * See LICENSE.txt for licensing information.
+ */
+
+package de.ailis.usb4java.jsr80;
+
+import javax.usb.UsbConst;
+import javax.usb.UsbEndpoint;
+import javax.usb.UsbEndpointDescriptor;
+import javax.usb.UsbInterface;
+import javax.usb.UsbPipe;
+
+
+/**
+ * usb4java implementation of UsbEndpoint.
+ *
+ * @author Klaus Reimer (k@ailis.de)
+ */
+
+public final class UsbEndpointImpl implements UsbEndpoint
+{
+    /** The USB interface this endpoint belongs to. */
+    private final UsbInterfaceImpl iface;
+
+    /** The USB endpoint descriptor. */
+    private final UsbEndpointDescriptor descriptor;
+
+    /** The USB pipe for this endpoint. */
+    private final UsbPipe pipe;
+
+
+    /**
+     * Constructor.
+     *
+     * @param iface
+     *            The USB interface this endpoint belongs to.
+     * @param descriptor
+     *            The USB endpoint descriptor.
+     * @param device
+     *            The USB device.
+     */
+
+    public UsbEndpointImpl(final UsbInterfaceImpl iface,
+        final UsbEndpointDescriptor descriptor, final AbstractDevice device)
+    {
+        this.iface = iface;
+        this.descriptor = descriptor;
+        this.pipe = new UsbPipeImpl(this, device);
+    }
+
+
+    /**
+     * @see UsbEndpoint#getUsbInterface()
+     */
+
+    @Override
+    public UsbInterface getUsbInterface()
+    {
+        return this.iface;
+    }
+
+
+    /**
+     * @see UsbEndpoint#getUsbEndpointDescriptor()
+     */
+
+    @Override
+    public UsbEndpointDescriptor getUsbEndpointDescriptor()
+    {
+        return this.descriptor;
+    }
+
+
+    /**
+     * @see UsbEndpoint#getDirection()
+     */
+
+    @Override
+    public byte getDirection()
+    {
+        return (byte) (this.descriptor.bEndpointAddress() & UsbConst.ENDPOINT_DIRECTION_MASK);
+    }
+
+
+    /**
+     * @see UsbEndpoint#getType()
+     */
+
+    @Override
+    public byte getType()
+    {
+        return (byte) (this.descriptor.bmAttributes() & UsbConst.ENDPOINT_TYPE_MASK);
+    }
+
+
+    /**
+     * @see UsbEndpoint#getUsbPipe()
+     */
+
+    @Override
+    public UsbPipe getUsbPipe()
+    {
+        return this.pipe;
+    }
+}

src/main/java/de/ailis/usb4java/jsr80/UsbInterfaceImpl.java

@@ -8,11 +8,14 @@ package de.ailis.usb4java.jsr80;
 import java.io.UnsupportedEncodingException;
 import java.util.ArrayList;
 import java.util.Collections;
+import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
 
 import javax.usb.UsbClaimException;
 import javax.usb.UsbConfiguration;
 import javax.usb.UsbEndpoint;
+import javax.usb.UsbEndpointDescriptor;
 import javax.usb.UsbException;
 import javax.usb.UsbInterface;
 import javax.usb.UsbInterfaceDescriptor;
@@ -20,6 +23,7 @@ import javax.usb.UsbInterfacePolicy;
 import javax.usb.UsbNotActiveException;
 
 import de.ailis.usb4java.USBLock;
+import de.ailis.usb4java.USB_Endpoint_Descriptor;
 import de.ailis.usb4java.USB_Interface_Descriptor;
 
 
@@ -37,6 +41,13 @@ public final class UsbInterfaceImpl implements UsbInterface
     /** The interface descriptor. */
     private final UsbInterfaceDescriptor descriptor;
 
+    /** The endpoint address to endpoints mapping. */
+    private final Map<Byte, UsbEndpoint> endpointMap =
+        new HashMap<Byte, UsbEndpoint>();
+
+    /** The endpoints. */
+    private final List<UsbEndpoint> endpoints;
+
 
     /**
      * Constructor.
@@ -45,15 +56,30 @@ public final class UsbInterfaceImpl implements UsbInterface
      *            The USB configuration.
      * @param lowLevelDescriptor
      *            The low-level USB interface descriptor.
+     * @param device
+     *            The USB device.
      */
 
     public UsbInterfaceImpl(final UsbConfigurationImpl configuration,
-        final USB_Interface_Descriptor lowLevelDescriptor)
+        final USB_Interface_Descriptor lowLevelDescriptor,
+        final AbstractDevice device)
     {
         this.configuration = configuration;
         this.descriptor = new UsbInterfaceDescriptorImpl(lowLevelDescriptor);
-    }
 
+        final List<UsbEndpoint> endpoints = new ArrayList<UsbEndpoint>();
+        for (final USB_Endpoint_Descriptor desc : lowLevelDescriptor
+            .endpoint())
+        {
+            final UsbEndpointDescriptor descriptor =
+                new UsbEndpointDescriptorImpl(desc);
+            final UsbEndpoint endpoint =
+                new UsbEndpointImpl(this, descriptor, device);
+            this.endpointMap.put(descriptor.bEndpointAddress(), endpoint);
+            endpoints.add(endpoint);
+        }
+        this.endpoints = Collections.unmodifiableList(endpoints);
+    }
 
     /**
      * Checks if the configuration is active. If not then an
@@ -108,7 +134,8 @@ public final class UsbInterfaceImpl implements UsbInterface
             device.setActiveUsbConfigurationNumber(this.configuration
                     .getUsbConfigurationDescriptor().bConfigurationValue());
             device.claimInterface(this.descriptor.bInterfaceNumber());
-            this.configuration.setUsbInterface(this.descriptor.bInterfaceNumber(), this);
+            this.configuration.setUsbInterface(
+                this.descriptor.bInterfaceNumber(), this);
         }
         finally
         {
@@ -148,6 +175,9 @@ public final class UsbInterfaceImpl implements UsbInterface
     @Override
     public boolean isActive()
     {
+        System.out.println(this.configuration.getUsbInterface(this.descriptor
+            .bInterfaceNumber()));
+        System.out.println(this);
         return this.configuration.getUsbInterface(this.descriptor
                 .bInterfaceNumber()) == this;
     }
@@ -238,8 +268,7 @@ public final class UsbInterfaceImpl implements UsbInterface
     @Override
     public List<UsbEndpoint> getUsbEndpoints()
     {
-        // TODO
-        throw new UnsupportedOperationException();
+        return this.endpoints;
     }
 
 
@@ -250,8 +279,7 @@ public final class UsbInterfaceImpl implements UsbInterface
     @Override
     public UsbEndpoint getUsbEndpoint(final byte address)
     {
-        // TODO
-        throw new UnsupportedOperationException();
+        return this.endpointMap.get(address);
     }
 
 
@@ -262,8 +290,7 @@ public final class UsbInterfaceImpl implements UsbInterface
     @Override
     public boolean containsUsbEndpoint(final byte address)
     {
-        // TODO
-        throw new UnsupportedOperationException();
+        return this.endpointMap.containsKey(address);
     }
 
 

src/main/java/de/ailis/usb4java/jsr80/UsbIrpQueue.java

@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2011 Klaus Reimer <k@ailis.de>
+ * See LICENSE.txt for licensing information.
+ */
+
+package de.ailis.usb4java.jsr80;
+
+import java.util.Deque;
+import java.util.LinkedList;
+
+import javax.usb.UsbIrp;
+
+
+/**
+ * USB I/O request packet queue.
+ *
+ * @author Klaus Reimer (k@ailis.de)
+ */
+
+final class UsbIrpQueue
+{
+    /** The queued packets. */
+    private final Deque<UsbIrp> irps = new LinkedList<UsbIrp>();
+
+
+    /**
+     * Adds a request packet to the queue.
+     *
+     * @param irp
+     *            The packet to add to the queue.
+     */
+
+    public void add(final UsbIrp irp)
+    {
+        synchronized (this.irps)
+        {
+            this.irps.add(irp);
+        }
+    }
+
+
+    /**
+     * Returns the next request packet to process.
+     *
+     * @return The next packet to process or null if queue is empty.
+     */
+
+    public UsbIrp get()
+    {
+        synchronized (this.irps)
+        {
+            return this.irps.poll();
+        }
+    }
+
+
+    /**
+     * Removes all remaining unprocessed requests.
+     */
+
+    public void clear()
+    {
+        synchronized (this.irps)
+        {
+            this.irps.clear();
+        }
+    }
+
+
+    /**
+     * Checks if queue is empty.
+     *
+     * @return True if queue is empty, false if not.
+     */
+
+    public boolean isEmpty()
+    {
+        return this.irps.isEmpty();
+    }
+}

src/main/java/de/ailis/usb4java/jsr80/UsbPipeImpl.java

@@ -0,0 +1,392 @@
+/*
+ * Copyright (C) 2011 Klaus Reimer <k@ailis.de>
+ * See LICENSE.txt for licensing information.
+ */
+
+package de.ailis.usb4java.jsr80;
+
+import java.util.List;
+
+import javax.usb.UsbConfiguration;
+import javax.usb.UsbControlIrp;
+import javax.usb.UsbDisconnectedException;
+import javax.usb.UsbException;
+import javax.usb.UsbInterface;
+import javax.usb.UsbIrp;
+import javax.usb.UsbNotActiveException;
+import javax.usb.UsbNotClaimedException;
+import javax.usb.UsbNotOpenException;
+import javax.usb.UsbPipe;
+import javax.usb.event.UsbPipeListener;
+import javax.usb.util.DefaultUsbControlIrp;
+import javax.usb.util.DefaultUsbIrp;
+
+
+/**
+ * usb4java implementation of UsbPipe.
+ *
+ * @author Klaus Reimer (k@ailis.de)
+ */
+
+public final class UsbPipeImpl implements UsbPipe
+{
+    /** The endpoint this pipe belongs to. */
+    private final UsbEndpointImpl endpoint;
+
+    /** The device. */
+    private final AbstractDevice device;
+
+    /** The USB pipe listeners. */
+    private final UsbPipeListenerList listeners = new UsbPipeListenerList();
+
+    /** If pipe is open or not. */
+    private boolean opened;
+
+    /** The request queue. */
+    private final UsbIrpQueue queue = new UsbIrpQueue();
+
+    /** The thread which processes the queue. null if none. */
+    private PipeQueueProcessor queueProcessor;
+
+
+    /**
+     * Constructor.
+     *
+     * @param endpoint
+     *            The endpoint this pipe belongs to.
+     * @param device
+     *            The USB device.
+     */
+
+
+    UsbPipeImpl(final UsbEndpointImpl endpoint, final AbstractDevice device)
+    {
+        this.endpoint = endpoint;
+        this.device = device;
+    }
+
+
+    /**
+     * Returns the USB device.
+     *
+     * @return The USB device.
+     */
+
+    AbstractDevice getDevice()
+    {
+        return this.device;
+    }
+
+
+    /**
+     * Ensures the pipe is active.
+     *
+     * @throws UsbNotActiveException
+     *             When pipe is not active
+     */
+
+    private void checkActive() throws UsbNotActiveException
+    {
+        if (!isActive())
+            throw new UsbNotActiveException("Pipe is not active.");
+    }
+
+
+    /**
+     * Ensures the interface is active.
+     *
+     * @throws UsbNotClaimedException
+     *             When interface is not claimed.
+     */
+
+    private void checkClaimed() throws UsbNotClaimedException
+    {
+        if (!this.endpoint.getUsbInterface().isClaimed())
+            throw new UsbNotClaimedException("Interface is not claimed.");
+    }
+
+
+    /**
+     * Ensures the device is not disconnected.
+     *
+     * @throws UsbDisconnectedException
+     *             When device has been disconnected.
+     */
+
+    private void checkDisconnected() throws UsbDisconnectedException
+    {
+        // TODO implement me
+    }
+
+
+    /**
+     * Ensures the pipe is open.
+     *
+     * @throws UsbNotOpenException
+     *             When pipe is not open.
+     */
+
+    private void checkOpen() throws UsbNotOpenException
+    {
+        if (!isOpen())
+            throw new UsbNotOpenException("Pipe is not open.");
+    }
+
+
+    /**
+     * @see javax.usb.UsbPipe#open()
+     */
+
+    @Override
+    public void open() throws UsbException, UsbNotActiveException,
+        UsbNotClaimedException, UsbDisconnectedException
+    {
+        checkActive();
+        checkClaimed();
+        checkDisconnected();
+        if (this.opened) throw new UsbException("Pipe is already open");
+
+        this.queueProcessor = new PipeQueueProcessor(this);
+        this.queueProcessor.start();
+
+        this.opened = true;
+    }
+
+
+    /**
+     * @see javax.usb.UsbPipe#close()
+     */
+
+    @Override
+    public void close() throws UsbException, UsbNotActiveException,
+        UsbNotOpenException, UsbDisconnectedException
+    {
+        checkActive();
+        checkClaimed();
+        checkDisconnected();
+        if (!this.opened) throw new UsbException("Pipe is already closed");
+        if (this.queueProcessor.isProcessing() || !this.queue.isEmpty())
+            throw new UsbException("Pipe is still in use");
+
+        this.queue.clear();
+        this.queueProcessor.shutdownAndWait();
+        this.queueProcessor = null;
+
+        this.opened = false;
+    }
+
+
+    /**
+     * @see javax.usb.UsbPipe#isActive()
+     */
+
+    @Override
+    public boolean isActive()
+    {
+        final UsbInterface iface = this.endpoint.getUsbInterface();
+        final UsbConfiguration config = iface.getUsbConfiguration();
+        return iface.isActive() && config.isActive();
+    }
+
+
+    /**
+     * @see javax.usb.UsbPipe#isOpen()
+     */
+
+    @Override
+    public boolean isOpen()
+    {
+        return this.opened;
+    }
+
+
+    /**
+     * @see javax.usb.UsbPipe#getUsbEndpoint()
+     */
+
+    @Override
+    public UsbEndpointImpl getUsbEndpoint()
+    {
+        return this.endpoint;
+    }
+
+
+    /**
+     * @see javax.usb.UsbPipe#syncSubmit(byte[])
+     */
+
+    @Override
+    public int syncSubmit(final byte[] data) throws UsbException,
+        UsbNotActiveException, UsbNotOpenException, IllegalArgumentException,
+        UsbDisconnectedException
+    {
+        final UsbIrp irp = asyncSubmit(data);
+        irp.waitUntilComplete();
+        if (irp.isUsbException()) throw irp.getUsbException();
+        return irp.getActualLength();
+    }
+
+
+    /**
+     * @see javax.usb.UsbPipe#asyncSubmit(byte[])
+     */
+
+    @Override
+    public UsbIrp asyncSubmit(final byte[] data) throws UsbException,
+        UsbNotActiveException, UsbNotOpenException, IllegalArgumentException,
+        UsbDisconnectedException
+    {
+        if (data == null)
+            throw new IllegalArgumentException("data must not be null");
+        final UsbIrp irp = createUsbIrp();
+        irp.setAcceptShortPacket(true);
+        irp.setData(data);
+        asyncSubmit(irp);
+        return irp;
+    }
+
+
+    /**
+     * @see javax.usb.UsbPipe#syncSubmit(javax.usb.UsbIrp)
+     */
+
+    @Override
+    public void syncSubmit(final UsbIrp irp) throws UsbException,
+        UsbNotActiveException, UsbNotOpenException, IllegalArgumentException,
+        UsbDisconnectedException
+    {
+        if (irp == null)
+            throw new IllegalArgumentException("irp must not be null");
+        asyncSubmit(irp);
+        irp.waitUntilComplete();
+        if (irp.isUsbException()) throw irp.getUsbException();
+    }
+
+
+    /**
+     * @see javax.usb.UsbPipe#asyncSubmit(javax.usb.UsbIrp)
+     */
+
+    @Override
+    public void asyncSubmit(final UsbIrp irp) throws UsbException,
+        UsbNotActiveException, UsbNotOpenException, IllegalArgumentException,
+        UsbDisconnectedException
+    {
+        if (irp == null)
+            throw new IllegalArgumentException("irp must not be null");
+        checkActive();
+        checkDisconnected();
+        checkOpen();
+
+        this.queue.add(irp);
+        this.queueProcessor.notify();
+    }
+
+
+    /**
+     * @see javax.usb.UsbPipe#syncSubmit(java.util.List)
+     */
+
+    @Override
+    public void syncSubmit(@SuppressWarnings("rawtypes") final List list)
+        throws UsbException, UsbNotActiveException, UsbNotOpenException,
+        IllegalArgumentException, UsbDisconnectedException
+    {
+        for (final Object item: list)
+        {
+            final UsbIrp irp = (UsbIrp) item;
+            syncSubmit(irp);
+        }
+    }
+
+
+    /**
+     * @see javax.usb.UsbPipe#asyncSubmit(java.util.List)
+     */
+
+    @Override
+    public void asyncSubmit(@SuppressWarnings("rawtypes") final List list)
+        throws UsbException, UsbNotActiveException, UsbNotOpenException,
+        IllegalArgumentException, UsbDisconnectedException
+    {
+        for (final Object item: list)
+        {
+            final UsbIrp irp = (UsbIrp) item;
+            asyncSubmit(irp);
+        }
+    }
+
+
+    /**
+     * @see javax.usb.UsbPipe#abortAllSubmissions()
+     */
+
+    @Override
+    public void abortAllSubmissions() throws UsbNotActiveException,
+        UsbNotOpenException, UsbDisconnectedException
+    {
+        checkActive();
+        checkDisconnected();
+        checkOpen();
+        this.queue.clear();
+        this.queueProcessor.shutdownAndWait();
+    }
+
+
+    /**
+     * @see javax.usb.UsbPipe#createUsbIrp()
+     */
+
+    @Override
+    public UsbIrp createUsbIrp()
+    {
+        return new DefaultUsbIrp();
+    }
+
+
+    /**
+     * @see javax.usb.UsbPipe#createUsbControlIrp(byte, byte, short, short)
+     */
+
+    @Override
+    public UsbControlIrp createUsbControlIrp(final byte bmRequestType,
+        final byte bRequest,
+        final short wValue, final short wIndex)
+    {
+        return new DefaultUsbControlIrp(bmRequestType, bRequest, wValue, wIndex);
+    }
+
+
+    /**
+     * @see javax.usb.UsbPipe#addUsbPipeListener(javax.usb.event.UsbPipeListener)
+     */
+
+    @Override
+    public void addUsbPipeListener(final UsbPipeListener listener)
+    {
+        this.listeners.add(listener);
+    }
+
+
+    /**
+     * @see javax.usb.UsbPipe#removeUsbPipeListener(javax.usb.event.UsbPipeListener)
+     */
+
+    @Override
+    public void removeUsbPipeListener(final UsbPipeListener listener)
+    {
+        this.listeners.remove(listener);
+    }
+
+
+    /**
+     * Returns the request packet queue.
+     *
+     * @return The request packet queue. Never null.
+     */
+
+    UsbIrpQueue getQueue()
+    {
+        return this.queue;
+    }
+}