XMLSerialization

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## weka.core.xml
Class XMLSerialization

    java.lang.Object
      weka.core.xml.XMLSerialization

All Implemented Interfaces:
  RevisionHandler

Direct Known Subclasses:
  XMLBasicSerialization

    public class XMLSerialization

extends java.lang.Object
implements RevisionHandler

With this class objects can be serialized to XML instead into a binary format. It uses introspection (cf. beans) to retrieve the data from the given object, i.e. it can only access beans-conform fields automatically.

The generic approach of writing data as XML can be overriden by adding custom methods for reading/writing in a derived class (cf. `m_Properties`, `m_CustomMethods`).
Custom read and write methods must have the same signature (and also be `public`!) as the `readFromXML` and `writeToXML` methods. Methods that apply to the naming rule `read + property name` are added automatically to the list of methods by the method `XMLSerializationMethodHandler.addMethods(...)`.

Other properties that are not conform the bean set/get-methods have to be processed manually in a derived class (cf. `readPostProcess(Object)`, `writePostProcess(Object)`).

For a complete XML serialization/deserialization have a look at the `KOML` class.

If a stored class has a constructor that takes a String to initialize (e.g. String or Double) then the content of the tag will used for the constructor, e.g. from

    <object name="name" class="String" primitive="no">Smith</object>

"Smith" will be used to instantiate a String object as constructor argument.

Version:
  $Revision: 1.16 $
Author:
  FracPete (fracpete at waikato dot ac dot nz)
See Also:
  `KOML`, `fromXML(Document)`, `toXML(Object)`, `m_Properties`, `m_CustomMethods`, `readPostProcess(Object)`, `writePostProcess(Object)`, `readFromXML(Element)`, `writeToXML(Element, Object, String)`

Field Summary
`static java.lang.String` | `ATT_ARRAY` the tag whether array or not (yes/no)
`static java.lang.String` | `ATT_ARRAY_DEFAULT` default value for attribute ATT_ARRAY
`static java.lang.String` | `ATT_CLASS` the tag for the class
`static java.lang.String` | `ATT_NAME` the tag for the name
`static java.lang.String` | `ATT_NULL` the tag whether null or not (yes/no)
`static java.lang.String` | `ATT_NULL_DEFAULT` default value for attribute ATT_NULL
`static java.lang.String` | `ATT_PRIMITIVE` the tag whether primitive or not (yes/no)
`static java.lang.String` | `ATT_PRIMITIVE_DEFAULT` default value for attribute ATT_PRIMITIVE
`static java.lang.String` | `ATT_VERSION` the version attribute
`static java.lang.String` | `DOCTYPE` the DOCTYPE for the serialization
`static java.lang.String` | `ROOT_NODE` the root node of the XML document
`static java.lang.String` | `TAG_OBJECT` the tag for an object
`static java.lang.String` | `VAL_NO` the value "no" for the primitive and array attribute
`static java.lang.String` | `VAL_ROOT` the value of the name for the root node
`static java.lang.String` | `VAL_YES` the value "yes" for the primitive and array attribute

Constructor Summary
`XMLSerialization()` initializes the serialization

Method Summary
`void` | `clear()` generates internally a new XML document and clears also the IgnoreList and the mappings for the Read/Write-Methods
`java.lang.Object` | `fromXML(org.w3c.dom.Document document)` returns the given DOM document as an instance of the specified class
`java.lang.String` | `getRevision()` Returns the revision string.
`java.lang.String` | `getVersion()` returns the WEKA version with which the serialized object was created
`static void` | `main(java.lang.String[] args)` for testing only.
`java.lang.Object` | `read(java.io.File file)` parses the given file and returns a DOM document
`java.lang.Object` | `read(java.io.InputStream stream)` parses the given stream and returns a DOM document
`java.lang.Object` | `read(java.io.Reader reader)` parses the given reader and returns a DOM document
`java.lang.Object` | `read(java.lang.String xml)` parses the given XML string (can be XML or a filename) and returns an Object generated from the representation
`boolean` | `readBooleanFromXML(org.w3c.dom.Element node)` builds the primitive from the given DOM node.
`byte` | `readByteFromXML(org.w3c.dom.Element node)` builds the primitive from the given DOM node.
`char` | `readCharFromXML(org.w3c.dom.Element node)` builds the primitive from the given DOM node.
`double` | `readDoubleFromXML(org.w3c.dom.Element node)` builds the primitive from the given DOM node.
`float` | `readFloatFromXML(org.w3c.dom.Element node)` builds the primitive from the given DOM node.
`java.lang.Object` | `readFromXML(org.w3c.dom.Element node)` builds the object from the given DOM node.
`java.lang.Object` | `readFromXML(java.lang.Object o, java.lang.String name, org.w3c.dom.Element child)` adds the specific node to the object via a set method
`int` | `readIntFromXML(org.w3c.dom.Element node)` builds the primitive from the given DOM node.
`long` | `readLongFromXML(org.w3c.dom.Element node)` builds the primitive from the given DOM node.
`short` | `readShortFromXML(org.w3c.dom.Element node)` builds the primitive from the given DOM node.
`XMLDocument` | `toXML(java.lang.Object o)` extracts all accesible properties from the given object
`void` | `write(java.io.File file, java.lang.Object o)` writes the given object into the file
`void` | `write(java.io.OutputStream stream, java.lang.Object o)` writes the given object into the stream
`void` | `write(java.lang.String file, java.lang.Object o)` writes the given object into the file
`void` | `write(java.io.Writer writer, java.lang.Object o)` writes the given object into the writer
`org.w3c.dom.Element` | `writeToXML(org.w3c.dom.Element parent, java.lang.Object o, java.lang.String name)` adds the given Object to a DOM structure.

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

Field Detail

### TAG_OBJECT

    public static final java.lang.String TAG_OBJECT

  the tag for an object

  See Also:
    Constant Field Values

### ATT_VERSION

    public static final java.lang.String ATT_VERSION

  the version attribute

  See Also:
    Constant Field Values

### ATT_NAME

    public static final java.lang.String ATT_NAME

  the tag for the name

  See Also:
    Constant Field Values

### ATT_CLASS

    public static final java.lang.String ATT_CLASS

  the tag for the class

  See Also:
    Constant Field Values

### ATT_PRIMITIVE

    public static final java.lang.String ATT_PRIMITIVE

  the tag whether primitive or not (yes/no)

  See Also:
    Constant Field Values

### ATT_ARRAY

    public static final java.lang.String ATT_ARRAY

  the tag whether array or not (yes/no)

  See Also:
    Constant Field Values

### ATT_NULL

    public static final java.lang.String ATT_NULL

  the tag whether null or not (yes/no)

  See Also:
    Constant Field Values

### VAL_YES

    public static final java.lang.String VAL_YES

  the value "yes" for the primitive and array attribute

  See Also:
    Constant Field Values

### VAL_NO

    public static final java.lang.String VAL_NO

  the value "no" for the primitive and array attribute

  See Also:
    Constant Field Values

### VAL_ROOT

    public static final java.lang.String VAL_ROOT

  the value of the name for the root node

  See Also:
    Constant Field Values

### ROOT_NODE

    public static final java.lang.String ROOT_NODE

  the root node of the XML document

  See Also:
    Constant Field Values

### ATT_PRIMITIVE_DEFAULT

    public static final java.lang.String ATT_PRIMITIVE_DEFAULT

  default value for attribute ATT_PRIMITIVE

  See Also:
    `ATT_PRIMITIVE`, Constant Field Values

### ATT_ARRAY_DEFAULT

    public static final java.lang.String ATT_ARRAY_DEFAULT

  default value for attribute ATT_ARRAY

  See Also:
    `ATT_ARRAY`, Constant Field Values

### ATT_NULL_DEFAULT

    public static final java.lang.String ATT_NULL_DEFAULT

  default value for attribute ATT_NULL

  See Also:
    `ATT_NULL`, Constant Field Values

### DOCTYPE

    public static final java.lang.String DOCTYPE

  the DOCTYPE for the serialization

Constructor Detail

### XMLSerialization

    public XMLSerialization()
                     throws java.lang.Exception

  initializes the serialization

  Throws:
    `java.lang.Exception` - if initialization fails

Method Detail

### clear

    public void clear()
               throws java.lang.Exception

  generates internally a new XML document and clears also the IgnoreList and the mappings for the Read/Write-Methods

  Throws:
    `java.lang.Exception` - if something goes wrong

### getVersion

    public java.lang.String getVersion()

  returns the WEKA version with which the serialized object was created

  Returns:
    the current version
  See Also:
    `Version`

### writeToXML

    public org.w3c.dom.Element writeToXML(org.w3c.dom.Element parent,
                                          java.lang.Object o,
                                          java.lang.String name)
                                   throws java.lang.Exception

  adds the given Object to a DOM structure. (only public due to reflection).
  Note: `overrideClassname(Object)` is not invoked in case of arrays, since the array class could be a superclass, whereas the elements of the array can be specialized subclasses. In case of an array the method `overrideClassname(String)` is invoked, which searches for an exact match of the classname in the override hashtable.

  Parameters:
    `parent` - the parent of this object, e.g. the class this object is a member of
    `o` - the Object to describe in XML
    `name` - the name of the object
  Returns:
    the node that was created
  Throws:
    `java.lang.Exception` - if the DOM creation fails
  See Also:
    `overrideClassname(Object)`, `overrideClassname(String)`, `m_ClassnameOverride`

### toXML

    public XMLDocument toXML(java.lang.Object o)
                      throws java.lang.Exception

  extracts all accesible properties from the given object

  Parameters:
    `o` - the object to turn into an XML representation
  Returns:
    the generated DOM document
  Throws:
    `java.lang.Exception` - if XML generation fails

### readBooleanFromXML

    public boolean readBooleanFromXML(org.w3c.dom.Element node)
                               throws java.lang.Exception

  builds the primitive from the given DOM node.

  Parameters:
    `node` - the associated XML node
  Returns:
    the primitive created from the XML description
  Throws:
    `java.lang.Exception` - if instantiation fails

### readByteFromXML

    public byte readByteFromXML(org.w3c.dom.Element node)
                         throws java.lang.Exception

  builds the primitive from the given DOM node.

  Parameters:
    `node` - the associated XML node
  Returns:
    the primitive created from the XML description
  Throws:
    `java.lang.Exception` - if instantiation fails

### readCharFromXML

    public char readCharFromXML(org.w3c.dom.Element node)
                         throws java.lang.Exception

  builds the primitive from the given DOM node.

  Parameters:
    `node` - the associated XML node
  Returns:
    the primitive created from the XML description
  Throws:
    `java.lang.Exception` - if instantiation fails

### readDoubleFromXML

    public double readDoubleFromXML(org.w3c.dom.Element node)
                             throws java.lang.Exception

  builds the primitive from the given DOM node.

  Parameters:
    `node` - the associated XML node
  Returns:
    the primitive created from the XML description
  Throws:
    `java.lang.Exception` - if instantiation fails

### readFloatFromXML

    public float readFloatFromXML(org.w3c.dom.Element node)
                           throws java.lang.Exception

  builds the primitive from the given DOM node.

  Parameters:
    `node` - the associated XML node
  Returns:
    the primitive created from the XML description
  Throws:
    `java.lang.Exception` - if instantiation fails

### readIntFromXML

    public int readIntFromXML(org.w3c.dom.Element node)
                       throws java.lang.Exception

  builds the primitive from the given DOM node.

  Parameters:
    `node` - the associated XML node
  Returns:
    the primitive created from the XML description
  Throws:
    `java.lang.Exception` - if instantiation fails

### readLongFromXML

    public long readLongFromXML(org.w3c.dom.Element node)
                         throws java.lang.Exception

  builds the primitive from the given DOM node.

  Parameters:
    `node` - the associated XML node
  Returns:
    the primitive created from the XML description
  Throws:
    `java.lang.Exception` - if instantiation fails

### readShortFromXML

    public short readShortFromXML(org.w3c.dom.Element node)
                           throws java.lang.Exception

  builds the primitive from the given DOM node.

  Parameters:
    `node` - the associated XML node
  Returns:
    the primitive created from the XML description
  Throws:
    `java.lang.Exception` - if instantiation fails

### readFromXML

    public java.lang.Object readFromXML(java.lang.Object o,
                                        java.lang.String name,
                                        org.w3c.dom.Element child)
                                 throws java.lang.Exception

  adds the specific node to the object via a set method

  Parameters:
    `o` - the object to set a property
    `name` - the name of the object for which to set a property (only for information reasons)
    `child` - the value of the property to add
  Returns:
    the provided object, but augmented by the child
  Throws:
    `java.lang.Exception` - if something goes wrong

### readFromXML

    public java.lang.Object readFromXML(org.w3c.dom.Element node)
                                 throws java.lang.Exception

  builds the object from the given DOM node. (only public due to reflection)

  Parameters:
    `node` - the associated XML node
  Returns:
    the instance created from the XML description
  Throws:
    `java.lang.Exception` - if instantiation fails

### fromXML

    public java.lang.Object fromXML(org.w3c.dom.Document document)
                             throws java.lang.Exception

  returns the given DOM document as an instance of the specified class

  Parameters:
    `document` - the parsed DOM document representing the object
  Returns:
    the XML as object
  Throws:
    `java.lang.Exception` - if object instantiation fails

### read

    public java.lang.Object read(java.lang.String xml)
                          throws java.lang.Exception

  parses the given XML string (can be XML or a filename) and returns an Object generated from the representation

  Parameters:
    `xml` - the xml to parse (if "Returns:
    the generated instance
  Throws:
    `java.lang.Exception` - if something goes wrong with the parsing

### read

    public java.lang.Object read(java.io.File file)
                          throws java.lang.Exception

  parses the given file and returns a DOM document

  Parameters:
    `file` - the XML file to parse
  Returns:
    the parsed DOM document
  Throws:
    `java.lang.Exception` - if something goes wrong with the parsing

### read

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

  parses the given stream and returns a DOM document

  Parameters:
    `stream` - the XML stream to parse
  Returns:
    the parsed DOM document
  Throws:
    `java.lang.Exception` - if something goes wrong with the parsing

### read

    public java.lang.Object read(java.io.Reader reader)
                          throws java.lang.Exception

  parses the given reader and returns a DOM document

  Parameters:
    `reader` - the XML reader to parse
  Returns:
    the parsed DOM document
  Throws:
    `java.lang.Exception` - if something goes wrong with the parsing

### write

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

  writes the given object into the file

  Parameters:
    `file` - the filename to write to
    `o` - the object to serialize as XML
  Throws:
    `java.lang.Exception` - if something goes wrong with the parsing

### write

    public void write(java.io.File file,
                      java.lang.Object o)
               throws java.lang.Exception

  writes the given object into the file

  Parameters:
    `file` - the filename to write to
    `o` - the object to serialize as XML
  Throws:
    `java.lang.Exception` - if something goes wrong with the parsing

### write

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

  writes the given object into the stream

  Parameters:
    `stream` - the filename to write to
    `o` - the object to serialize as XML
  Throws:
    `java.lang.Exception` - if something goes wrong with the parsing

### write

    public void write(java.io.Writer writer,
                      java.lang.Object o)
               throws java.lang.Exception

  writes the given object into the writer

  Parameters:
    `writer` - the filename to write to
    `o` - the object to serialize as XML
  Throws:
    `java.lang.Exception` - if something goes wrong with the parsing

### main

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

  for testing only. if the first argument is a filename with ".xml" as extension it tries to generate an instance from the XML description and does a `toString()` of the generated object.

  Throws:
    `java.lang.Exception`

### getRevision

    public java.lang.String getRevision()

  Returns the revision string.

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

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