--- /dev/null
+/*\r
+ * 11/19/04 1.0 moved to LGPL.\r
+ * 12/12/99 Initial version. mdm@techie.com\r
+ *-----------------------------------------------------------------------\r
+ * This program is free software; you can redistribute it and/or modify\r
+ * it under the terms of the GNU Library General Public License as published\r
+ * by the Free Software Foundation; either version 2 of the License, or\r
+ * (at your option) any later version.\r
+ *\r
+ * This program is distributed in the hope that it will be useful,\r
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of\r
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\r
+ * GNU Library General Public License for more details.\r
+ *\r
+ * You should have received a copy of the GNU Library General Public\r
+ * License along with this program; if not, write to the Free Software\r
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.\r
+ *----------------------------------------------------------------------\r
+ */\r
+\r
+\r
+//import java.io.IOException;\r
+//import java.io.InputStream;\r
+//import java.io.InvalidClassException;\r
+//import java.io.InvalidObjectException;\r
+//import java.io.ObjectInputStream;\r
+//import java.io.ObjectOutputStream;\r
+//import java.io.OutputStream;\r
+//import java.lang.reflect.Array;\r
+\r
+/**\r
+ * The JavaLayerUtils class is not strictly part of the JavaLayer API.\r
+ * It serves to provide useful methods and system-wide hooks.\r
+ * \r
+ * @author MDM\r
+ */\r
+public class JavaLayerUtils\r
+{\r
+ static private JavaLayerHook hook = null;\r
+ \r
+ /**\r
+ * Deserializes the object contained in the given input stream.\r
+ * @param in The input stream to deserialize an object from.\r
+ * @param cls The expected class of the deserialized object. \r
+ */\r
+// static public Object deserialize(InputStream in, Class cls)\r
+ static public Object deserialize(InputStream in)\r
+ throws IOException\r
+ {\r
+// if (cls==null)\r
+// throw new NullPointerException("cls");\r
+ \r
+// Object obj = deserialize(in, cls);\r
+ Object obj = deserialize(in);\r
+// if (!cls.isInstance(obj))\r
+// {\r
+// throw new InvalidObjectException("type of deserialized instance not of required class.");\r
+// }\r
+ \r
+ return obj;\r
+ }\r
+ \r
+ /**\r
+ * Deserializes an object from the given <code>InputStream</code>.\r
+ * The deserialization is delegated to an <code>\r
+ * ObjectInputStream</code> instance. \r
+ * \r
+ * @param in The <code>InputStream</code> to deserialize an object\r
+ * from.\r
+ * \r
+ * @return The object deserialized from the stream. \r
+ * @exception IOException is thrown if there was a problem reading\r
+ * the underlying stream, or an object could not be deserialized\r
+ * from the stream.\r
+ * \r
+ * @see java.io.ObjectInputStream\r
+ */\r
+ static public Object deserialize(InputStream in)\r
+ throws IOException\r
+ {\r
+ if (in==null)\r
+ throw new NullPointerException("in");\r
+ \r
+ //TODO : need to enable after having objectinputstream\r
+ /*\r
+ ObjectInputStream objIn = new ObjectInputStream(in);\r
+ \r
+ Object obj;\r
+ \r
+ try\r
+ {\r
+ obj = objIn.readObject();\r
+ }\r
+ catch (ClassNotFoundException ex)\r
+ {\r
+ throw new InvalidClassException(ex.toString());\r
+ }\r
+ \r
+ return obj;\r
+ */\r
+ return null;\r
+ }\r
+\r
+ /**\r
+ * Deserializes an array from a given <code>InputStream</code>.\r
+ * \r
+ * @param in The <code>InputStream</code> to \r
+ * deserialize an object from.\r
+ * \r
+ * @param elemType The class denoting the type of the array\r
+ * elements.\r
+ * @param length The expected length of the array, or -1 if\r
+ * any length is expected.\r
+ */\r
+ static public Object deserializeArray(InputStream in, int length)\r
+ throws IOException\r
+ {\r
+ if (length<-1)\r
+ throw new IllegalArgumentException("length");\r
+ \r
+ Object obj = deserialize(in);\r
+ \r
+ return obj;\r
+ }\r
+// static public Object deserializeArray(InputStream in, Class elemType, int length)\r
+// throws IOException\r
+// {\r
+// if (elemType==null)\r
+// throw new NullPointerException("elemType");\r
+// \r
+// if (length<-1)\r
+// throw new IllegalArgumentException("length");\r
+// \r
+// Object obj = deserialize(in);\r
+// \r
+// //SSJava will never throw exceptions as it is so this code is meaningless\r
+// /*\r
+// Class cls = obj.getClass();\r
+// \r
+// if (!cls.isArray())\r
+// throw new InvalidObjectException("object is not an array");\r
+// \r
+// Class arrayElemType = cls.getComponentType();\r
+// if (arrayElemType!=elemType)\r
+// throw new InvalidObjectException("unexpected array component type");\r
+// \r
+// if (length != -1)\r
+// {\r
+// int arrayLength = Array.getLength(obj);\r
+// if (arrayLength!=length)\r
+// throw new InvalidObjectException("array length mismatch");\r
+// }\r
+// */\r
+// return obj;\r
+// }\r
+\r
+// static public Object deserializeArrayResource(String name, Class elemType, int length)\r
+ static public Object deserializeArrayResource(String name, int length)\r
+ throws IOException\r
+ { \r
+ InputStream str = getResourceAsStream(name);\r
+ if (str==null)\r
+ throw new IOException("unable to load resource '"+name+"'");\r
+ \r
+// Object obj = deserializeArray(str, elemType, length);\r
+ Object obj = deserializeArray(str, length);\r
+ \r
+ return obj;\r
+ } \r
+ \r
+ static public void serialize(OutputStream out, Object obj)\r
+ throws IOException\r
+ {\r
+ //TODO : need to enable after having objectinputstream\r
+// if (out==null)\r
+// throw new NullPointerException("out");\r
+// \r
+// if (obj==null)\r
+// throw new NullPointerException("obj");\r
+// \r
+// ObjectOutputStream objOut = new ObjectOutputStream(out);\r
+// objOut.writeObject(obj);\r
+ \r
+ }\r
+\r
+ /**\r
+ * Sets the system-wide JavaLayer hook.\r
+ */\r
+ static synchronized public void setHook(JavaLayerHook hook0) \r
+ {\r
+ hook = hook0;\r
+ }\r
+ \r
+ static synchronized public JavaLayerHook getHook()\r
+ {\r
+ return hook; \r
+ }\r
+ \r
+ /**\r
+ * Retrieves an InputStream for a named resource. \r
+ * \r
+ * @param name The name of the resource. This must be a simple\r
+ * name, and not a qualified package name.\r
+ * \r
+ * @return The InputStream for the named resource, or null if\r
+ * the resource has not been found. If a hook has been \r
+ * provided, its getResourceAsStream() method is called\r
+ * to retrieve the resource. \r
+ */\r
+ static synchronized public InputStream getResourceAsStream(String name)\r
+ {\r
+ InputStream is = null;\r
+ \r
+ if (hook!=null)\r
+ {\r
+ is = hook.getResourceAsStream(name); \r
+ }\r
+ //TODO java reflection\r
+// else\r
+// {\r
+// Class cls = JavaLayerUtils.class;\r
+// is = cls.getResourceAsStream(name);\r
+// }\r
+ \r
+ return is; \r
+ }\r
+}\r
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