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FileSystemRegistry (FileConnection Optional Package 1.0 Spec, Proposed Final Draft)
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FileConnection Optional Package 1.0<br>Proposed Final Draft</EM>
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javax.microedition.io.file</FONT>
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Class FileSystemRegistry</H2>
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java.lang.Object
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+--<B>javax.microedition.io.file.FileSystemRegistry</B>
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<DT>public class <B>FileSystemRegistry</B><DT>extends java.lang.Object</DL>
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The FileSystemRegistry is a central registry for file system listeners interested in the adding and removing (or mounting and unmounting) of file systems on a device.
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<DT><B>Since:</B></DT> <DD>FileConnection 1.0</DD><DT><B>See Also:</B><DD><A HREF="../../../../javax/microedition/io/file/FileConnection.html"><CODE>FileConnection</CODE></A>, <A HREF="../../../../javax/microedition/io/file/FileSystemListener.html"><CODE>FileSystemListener</CODE></A></DL>
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<CODE>static boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../javax/microedition/io/file/FileSystemRegistry.html#addFileSystemListener(javax.microedition.io.file.FileSystemListener)">addFileSystemListener</A></B>(javax.microedition.io.file.FileSystemListener listener)</CODE>
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This method is used to register a FileSystemListener that is notified in case of adding and removing a new file system root.</TD>
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<CODE>static java.util.Enumeration</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../javax/microedition/io/file/FileSystemRegistry.html#listRoots()">listRoots</A></B>()</CODE>
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This method returns the currently mounted root file systems on a device.</TD>
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<CODE>static boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../javax/microedition/io/file/FileSystemRegistry.html#removeFileSystemListener(javax.microedition.io.file.FileSystemListener)">removeFileSystemListener</A></B>(javax.microedition.io.file.FileSystemListener listener)</CODE>
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This method is used to remove a registered FileSystemListener.</TD>
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<A NAME="addFileSystemListener(javax.microedition.io.file.FileSystemListener)"><!-- --></A><H3>
addFileSystemListener</H3>
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public static boolean <B>addFileSystemListener</B>(javax.microedition.io.file.FileSystemListener listener)</PRE>
<DL>
<DD>This method is used to register a FileSystemListener that is notified in case of adding and removing a new file system root. Multiple file system listeners can be added. If file systems are not supported on a device, false will be returned from the method (this check is performed prior to security checks).
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<DD><DL>
<DT><B>Parameters:</B><DD><CODE>listener</CODE> - The new FileSystemListener to be registered in order to handle adding/removing file system roots.<DT><B>Returns:</B><DD>boolean indicating if file system listener was successfully added or not<DT><B>Throws:</B><DD><CODE>java.lang.SecurityException</CODE> - if application is not given permission to read files.<DD><CODE>java.lang.NullPointerException</CODE> - if listener is <code>null</code>.<DT><B>See Also:</B><DD><A HREF="../../../../javax/microedition/io/file/FileSystemListener.html"><CODE>FileSystemListener</CODE></A>, <A HREF="../../../../javax/microedition/io/file/FileConnection.html"><CODE>FileConnection</CODE></A></DL>
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removeFileSystemListener</H3>
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public static boolean <B>removeFileSystemListener</B>(javax.microedition.io.file.FileSystemListener listener)</PRE>
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<DD>This method is used to remove a registered FileSystemListener. If file systems are not supported on a device, false will be returned from the method.
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<DT><B>Parameters:</B><DD><CODE>listener</CODE> - The FileSystemListener to be removed.<DT><B>Returns:</B><DD>boolean indicating if file system listener was successfully removed or not<DT><B>Throws:</B><DD><CODE>java.lang.NullPointerException</CODE> - if listener is <code>null</code>.<DT><B>See Also:</B><DD><A HREF="../../../../javax/microedition/io/file/FileSystemListener.html"><CODE>FileSystemListener</CODE></A>, <A HREF="../../../../javax/microedition/io/file/FileConnection.html"><CODE>FileConnection</CODE></A></DL>
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<A NAME="listRoots()"><!-- --></A><H3>
listRoots</H3>
<PRE>
public static java.util.Enumeration <B>listRoots</B>()</PRE>
<DL>
<DD>This method returns the currently mounted root file systems on a device. If there are no roots available on the device, a zero length Enumeration is returned. If file systems are not supported on a device, a zero length Enumeration is also returned (this check is performed prior to security checks).
<P>
<DD><DL>
<DT><B>Returns:</B><DD>an Eumeration of mounted file systems.<DT><B>Throws:</B><DD><CODE>java.lang.SecurityException</CODE> - if application is not given permission to read files.<DT><B>See Also:</B><DD><A HREF="../../../../javax/microedition/io/file/FileConnection.html"><CODE>FileConnection</CODE></A></DL>
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Proposed Final Draft<br>Rev. 0.24</EM>
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