Add convenience adapter classes for the USB event listener interfaces.

src/main/java/de/ailis/usb4java/adapter/UsbDeviceAdapter.java

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+/*
+ * Copyright (C) 2013 Klaus Reimer <k@ailis.de>
+ * See LICENSE.md for licensing information.
+ */
+
+package de.ailis.usb4java.adapter;
+
+import javax.usb.event.UsbDeviceDataEvent;
+import javax.usb.event.UsbDeviceErrorEvent;
+import javax.usb.event.UsbDeviceEvent;
+import javax.usb.event.UsbDeviceListener;
+
+/**
+ * An abstract adapter class for receiving USB device events. The methods in
+ * this class are empty. This class exists as convenience for creating listener
+ * objects.
+ * 
+ * @author Klaus Reimer (k@ailis.de)
+ */
+public abstract class UsbDeviceAdapter implements UsbDeviceListener
+{
+    @Override
+    public void usbDeviceDetached(final UsbDeviceEvent event)
+    {
+        // Empty
+    }
+
+    @Override
+    public void errorEventOccurred(final UsbDeviceErrorEvent event)
+    {
+        // Empty
+    }
+
+    @Override
+    public void dataEventOccurred(final UsbDeviceDataEvent event)
+    {
+        // Empty
+    }
+}

src/main/java/de/ailis/usb4java/adapter/UsbPipeAdapter.java

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+/*
+ * Copyright (C) 2013 Klaus Reimer <k@ailis.de>
+ * See LICENSE.md for licensing information.
+ */
+
+package de.ailis.usb4java.adapter;
+
+import javax.usb.event.UsbPipeDataEvent;
+import javax.usb.event.UsbPipeErrorEvent;
+import javax.usb.event.UsbPipeListener;
+
+/**
+ * An abstract adapter class for receiving USB pipe events. The methods in
+ * this class are empty. This class exists as convenience for creating listener
+ * objects.
+ * 
+ * @author Klaus Reimer (k@ailis.de)
+ */
+public abstract class UsbPipeAdapter implements UsbPipeListener
+{
+    @Override
+    public void errorEventOccurred(UsbPipeErrorEvent event)
+    {
+        // Empty
+    }
+
+    @Override
+    public void dataEventOccurred(UsbPipeDataEvent event)
+    {
+        // Empty
+    }
+}

src/main/java/de/ailis/usb4java/adapter/UsbServicesAdapter.java

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+/*
+ * Copyright (C) 2013 Klaus Reimer <k@ailis.de>
+ * See LICENSE.md for licensing information.
+ */
+
+package de.ailis.usb4java.adapter;
+
+import javax.usb.event.UsbServicesEvent;
+import javax.usb.event.UsbServicesListener;
+
+/**
+ * An abstract adapter class for receiving USB service events. The methods in
+ * this class are empty. This class exists as convenience for creating listener
+ * objects.
+ * 
+ * @author Klaus Reimer (k@ailis.de)
+ */
+public abstract class UsbServicesAdapter implements UsbServicesListener
+{
+    @Override
+    public void usbDeviceAttached(final UsbServicesEvent event)
+    {
+        // Empty
+    }
+
+    @Override
+    public void usbDeviceDetached(final UsbServicesEvent event)
+    {
+        // Empty
+    }
+}

src/main/java/de/ailis/usb4java/adapter/package-info.java

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+/*
+ * Copyright (C) 2013 Klaus Reimer <k@ailis.de>
+ * See LICENSE.md for licensing information.
+ */
+
+/**
+ * Event adapter classes. 
+ */
+package de.ailis.usb4java.adapter;