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## weka.core
Class SerializationHelper

    java.lang.Object
      weka.core.SerializationHelper

All Implemented Interfaces:
  RevisionHandler

    public class SerializationHelper

extends java.lang.Object
implements RevisionHandler

A helper class for determining serialVersionUIDs and checking whether classes contain one and/or need one. One can also serialize and deserialize objects to and fro files or streams.

Version:
  $Revision: 6229 $
Author:
  fracpete (fracpete at waikato dot ac dot nz)

Field Summary
`static java.lang.String` | `SERIAL_VERSION_UID` the field name of serialVersionUID.

Constructor Summary
`SerializationHelper()`

Method Summary
`java.lang.String` | `getRevision()` Returns the revision string.
`static long` | `getUID(java.lang.Class c)` reads or creates the serialVersionUID for the given class.
`static long` | `getUID(java.lang.String classname)` reads or creates the serialVersionUID for the given class.
`static boolean` | `hasUID(java.lang.Class c)` checks whether the given class contains a serialVersionUID.
`static boolean` | `hasUID(java.lang.String classname)` checks whether the given class contains a serialVersionUID.
`static boolean` | `isSerializable(java.lang.Class c)` checks whether a class is serializable.
`static boolean` | `isSerializable(java.lang.String classname)` checks whether a class is serializable.
`static void` | `main(java.lang.String[] args)` Outputs information about a class on the commandline, takes class name as arguments.
`static boolean` | `needsUID(java.lang.Class c)` checks whether a class needs to declare a serialVersionUID, i.e., it implements the java.io.Serializable interface but doesn't declare a serialVersionUID.
`static boolean` | `needsUID(java.lang.String classname)` checks whether a class needs to declare a serialVersionUID, i.e., it implements the java.io.Serializable interface but doesn't declare a serialVersionUID.
`static java.lang.Object` | `read(java.io.InputStream stream)` deserializes from the given stream and returns the object from it.
`static java.lang.Object` | `read(java.lang.String filename)` deserializes the given file and returns the object from it.
`static java.lang.Object[]` | `readAll(java.io.InputStream stream)` deserializes from the given stream and returns the object from it.
`static java.lang.Object[]` | `readAll(java.lang.String filename)` deserializes the given file and returns the objects from it.
`static void` | `write(java.io.OutputStream stream, java.lang.Object o)` serializes the given object to the specified stream.
`static void` | `write(java.lang.String filename, java.lang.Object o)` serializes the given object to the specified file.
`static void` | `writeAll(java.io.OutputStream stream, java.lang.Object[] o)` serializes the given objects to the specified stream.
`static void` | `writeAll(java.lang.String filename, java.lang.Object[] o)` serializes the given objects to the specified file.

Methods inherited from class java.lang.Object
`equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### SERIAL_VERSION_UID

    public static final java.lang.String SERIAL_VERSION_UID

  the field name of serialVersionUID.

  See Also:
    Constant Field Values

Constructor Detail

### SerializationHelper

    public SerializationHelper()

Method Detail

### isSerializable

    public static boolean isSerializable(java.lang.String classname)

  checks whether a class is serializable.

  Parameters:
    `classname` - the class to check
  Returns:
    true if the class or one of its ancestors implements the Serializable interface, otherwise false (also if the class cannot be loaded)

### isSerializable

    public static boolean isSerializable(java.lang.Class c)

  checks whether a class is serializable.

  Parameters:
    `c` - the class to check
  Returns:
    true if the class or one of its ancestors implements the Serializable interface, otherwise false

### hasUID

    public static boolean hasUID(java.lang.String classname)

  checks whether the given class contains a serialVersionUID.

  Parameters:
    `classname` - the class to check
  Returns:
    true if the class contains a serialVersionUID, otherwise false (also if the class is not implementing serializable or cannot be loaded)

### hasUID

    public static boolean hasUID(java.lang.Class c)

  checks whether the given class contains a serialVersionUID.

  Parameters:
    `c` - the class to check
  Returns:
    true if the class contains a serialVersionUID, otherwise false (also if the class is not implementing serializable)

### needsUID

    public static boolean needsUID(java.lang.String classname)

  checks whether a class needs to declare a serialVersionUID, i.e., it implements the java.io.Serializable interface but doesn't declare a serialVersionUID.

  Parameters:
    `classname` - the class to check
  Returns:
    true if the class needs to declare one, false otherwise (also if the class cannot be loaded!)

### needsUID

    public static boolean needsUID(java.lang.Class c)

  checks whether a class needs to declare a serialVersionUID, i.e., it implements the java.io.Serializable interface but doesn't declare a serialVersionUID.

  Parameters:
    `c` - the class to check
  Returns:
    true if the class needs to declare one, false otherwise

### getUID

    public static long getUID(java.lang.String classname)

  reads or creates the serialVersionUID for the given class.

  Parameters:
    `classname` - the class to get the serialVersionUID for
  Returns:
    the UID, 0L for non-serializable classes (or if the class cannot be loaded)

### getUID

    public static long getUID(java.lang.Class c)

  reads or creates the serialVersionUID for the given class.

  Parameters:
    `c` - the class to get the serialVersionUID for
  Returns:
    the UID, 0L for non-serializable classes

### write

    public static void write(java.lang.String filename,
                             java.lang.Object o)
                      throws java.lang.Exception

  serializes the given object to the specified file.

  Parameters:
    `filename` - the file to write the object to
    `o` - the object to serialize
  Throws:
    `java.lang.Exception` - if serialization fails

### write

    public static void write(java.io.OutputStream stream,
                             java.lang.Object o)
                      throws java.lang.Exception

  serializes the given object to the specified stream.

  Parameters:
    `stream` - the stream to write the object to
    `o` - the object to serialize
  Throws:
    `java.lang.Exception` - if serialization fails

### writeAll

    public static void writeAll(java.lang.String filename,
                                java.lang.Object[] o)
                         throws java.lang.Exception

  serializes the given objects to the specified file.

  Parameters:
    `filename` - the file to write the object to
    `o` - the objects to serialize
  Throws:
    `java.lang.Exception` - if serialization fails

### writeAll

    public static void writeAll(java.io.OutputStream stream,
                                java.lang.Object[] o)
                         throws java.lang.Exception

  serializes the given objects to the specified stream.

  Parameters:
    `stream` - the stream to write the object to
    `o` - the objects to serialize
  Throws:
    `java.lang.Exception` - if serialization fails

### read

    public static java.lang.Object read(java.lang.String filename)
                                 throws java.lang.Exception

  deserializes the given file and returns the object from it.

  Parameters:
    `filename` - the file to deserialize from
  Returns:
    the deserialized object
  Throws:
    `java.lang.Exception` - if deserialization fails

### read

    public static java.lang.Object read(java.io.InputStream stream)
                                 throws java.lang.Exception

  deserializes from the given stream and returns the object from it.

  Parameters:
    `stream` - the stream to deserialize from
  Returns:
    the deserialized object
  Throws:
    `java.lang.Exception` - if deserialization fails

### readAll

    public static java.lang.Object[] readAll(java.lang.String filename)
                                      throws java.lang.Exception

  deserializes the given file and returns the objects from it.

  Parameters:
    `filename` - the file to deserialize from
  Returns:
    the deserialized objects
  Throws:
    `java.lang.Exception` - if deserialization fails

### readAll

    public static java.lang.Object[] readAll(java.io.InputStream stream)
                                      throws java.lang.Exception

  deserializes from the given stream and returns the object from it.

  Parameters:
    `stream` - the stream to deserialize from
  Returns:
    the deserialized object
  Throws:
    `java.lang.Exception` - if deserialization fails

### getRevision

    public java.lang.String getRevision()

  Returns the revision string.

  Specified by:
    `getRevision` in interface `RevisionHandler`
  Returns:
    the revision

### main

    public static void main(java.lang.String[] args)
                     throws java.lang.Exception

  Outputs information about a class on the commandline, takes class name as arguments.

  Parameters:
    `args` - the classnames to check
  Throws:
    `java.lang.Exception` - if something goes wrong

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