Songdb java version, source. only 1.5 compatible

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7101 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 207 insertions, 0 deletions

diff --git a/songdbj/javazoom/jl/decoder/JavaLayerUtils.java b/songdbj/javazoom/jl/decoder/JavaLayerUtils.java
new file mode 100644
index 0000000..c9ce383
--- /dev/null
+++ b/songdbj/javazoom/jl/decoder/JavaLayerUtils.java
@@ -0,0 +1,207 @@
+/*
+ * 11/19/04		1.0 moved to LGPL.
+ * 12/12/99		Initial version.	mdm@techie.com
+ *-----------------------------------------------------------------------
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU Library 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 Library General Public License for more details.
+ *
+ *   You should have received a copy of the GNU Library General Public
+ *   License along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *----------------------------------------------------------------------
+ */
+
+package javazoom.jl.decoder;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InvalidClassException;
+import java.io.InvalidObjectException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.io.OutputStream;
+import java.lang.reflect.Array;
+
+/**
+ * The JavaLayerUtils class is not strictly part of the JavaLayer API.
+ * It serves to provide useful methods and system-wide hooks.
+ * 
+ * @author MDM
+ */
+public class JavaLayerUtils
+{
+	static private JavaLayerHook	hook = null;
+	
+	/**
+	 * Deserializes the object contained in the given input stream.
+	 * @param in	The input stream to deserialize an object from.
+	 * @param cls	The expected class of the deserialized object. 
+	 */
+	static public Object deserialize(InputStream in, Class cls)
+		throws IOException
+	{
+		if (cls==null)
+			throw new NullPointerException("cls");
+		
+		Object obj = deserialize(in, cls);
+		if (!cls.isInstance(obj))
+		{
+			throw new InvalidObjectException("type of deserialized instance not of required class.");
+		}
+		
+		return obj;
+	}
+	
+	/**
+	 * Deserializes an object from the given <code>InputStream</code>.
+	 * The deserialization is delegated to an <code>
+	 * ObjectInputStream</code> instance. 
+	 * 
+	 * @param in	The <code>InputStream</code> to deserialize an object
+	 *				from.
+	 * 
+	 * @return The object deserialized from the stream. 
+	 * @exception IOException is thrown if there was a problem reading
+	 *		the underlying stream, or an object could not be deserialized
+	 *		from the stream.
+	 * 
+	 * @see java.io.ObjectInputStream
+	 */
+	static public Object deserialize(InputStream in)
+		throws IOException
+	{
+		if (in==null)
+			throw new NullPointerException("in");
+		
+		ObjectInputStream objIn = new ObjectInputStream(in);
+		
+		Object obj;
+		
+		try
+		{
+			obj = objIn.readObject();
+		}
+		catch (ClassNotFoundException ex)
+		{
+			throw new InvalidClassException(ex.toString());
+		}
+		
+		return obj;
+	}
+
+	/**
+	 * Deserializes an array from a given <code>InputStream</code>.
+	 * 
+	 * @param in		The <code>InputStream</code> to 
+	 *					deserialize an object from.
+	 *				
+	 * @param elemType	The class denoting the type of the array
+	 *					elements.
+	 * @param length	The expected length of the array, or -1 if
+	 *					any length is expected.
+	 */
+	static public Object deserializeArray(InputStream in, Class elemType, int length)
+		throws IOException
+	{
+		if (elemType==null)
+			throw new NullPointerException("elemType");
+		
+		if (length<-1)
+			throw new IllegalArgumentException("length");
+		
+		Object obj = deserialize(in);
+		
+		Class cls = obj.getClass();
+		
+		
+		if (!cls.isArray())
+			throw new InvalidObjectException("object is not an array");
+		
+		Class arrayElemType = cls.getComponentType();
+		if (arrayElemType!=elemType)
+			throw new InvalidObjectException("unexpected array component type");
+				
+		if (length != -1)
+		{
+			int arrayLength = Array.getLength(obj);
+			if (arrayLength!=length)
+				throw new InvalidObjectException("array length mismatch");
+		}
+		
+		return obj;
+	}
+
+	static public Object deserializeArrayResource(String name, Class elemType, int length)
+		throws IOException
+	{		
+		InputStream str = getResourceAsStream(name);
+		if (str==null)
+			throw new IOException("unable to load resource '"+name+"'");
+		
+		Object obj = deserializeArray(str, elemType, length);
+		
+		return obj;
+	}	
+	
+	static public void serialize(OutputStream out, Object obj)
+		throws IOException
+	{
+		if (out==null)
+			throw new NullPointerException("out");
+		
+		if (obj==null)
+			throw new NullPointerException("obj");
+		
+		ObjectOutputStream objOut = new ObjectOutputStream(out);
+		objOut.writeObject(obj);
+				
+	}
+
+	/**
+	 * Sets the system-wide JavaLayer hook.
+	 */
+	static synchronized public void setHook(JavaLayerHook hook0)		
+	{
+		hook = hook0;
+	}
+	
+	static synchronized public JavaLayerHook getHook()
+	{
+		return hook;	
+	}
+	
+	/**
+	 * Retrieves an InputStream for a named resource. 
+	 * 
+	 * @param name	The name of the resource. This must be a simple
+	 *				name, and not a qualified package name.
+	 * 
+	 * @return		The InputStream for the named resource, or null if
+	 *				the resource has not been found. If a hook has been 
+	 *				provided, its getResourceAsStream() method is called
+	 *				to retrieve the resource. 
+	 */
+	static synchronized public InputStream getResourceAsStream(String name)
+	{
+		InputStream is = null;
+		
+		if (hook!=null)
+		{
+			is = hook.getResourceAsStream(name);	
+		}
+		else
+		{
+			Class cls = JavaLayerUtils.class;
+			is = cls.getResourceAsStream(name);
+		}
+		
+		return is;		
+	}
+}