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## weka.core
Class PropertyPath

    java.lang.Object
      weka.core.PropertyPath

All Implemented Interfaces:
  RevisionHandler

    public class PropertyPath

extends java.lang.Object
implements RevisionHandler

A helper class for accessing properties in nested objects, e.g., accessing the "getRidge" method of a LinearRegression classifier part of MultipleClassifierCombiner, e.g., Vote. For doing so, one needs to supply the object to work on and a property path. The property path is a dot delimited path of property names ("getFoo()" and "setFoo(int)" have "foo" as property name), indices of arrays are 0-based. E.g.:

`getPropertyDescriptor(vote, "classifiers[1].ridge")` will return the second classifier (which should be our LinearRegression) of the given Vote meta-classifier and there the property descriptor of the "ridge" property. `getValue(...)` will return the actual value of the ridge parameter and `setValue(...)` will set it.

Version:
  $Revision: 4742 $
Author:
  fracpete (fracpete at waikato dot ac dot nz)

Nested Class Summary
`static class` | `PropertyPath.Path` Contains a (property) path structure
`static class` | `PropertyPath.PathElement` Represents a single element of a property path

Constructor Summary
`PropertyPath()`

Method Summary
`static weka.core.PropertyPath.PropertyContainer` | `find(java.lang.Object src, PropertyPath.Path path)` returns the property and object associated with the given path, null if a problem occurred.
`static java.beans.PropertyDescriptor` | `getPropertyDescriptor(java.lang.Object src, PropertyPath.Path path)` returns the property associated with the given path, null if a problem occurred.
`static java.beans.PropertyDescriptor` | `getPropertyDescriptor(java.lang.Object src, java.lang.String path)` returns the property associated with the given path
`java.lang.String` | `getRevision()` Returns the revision string.
`static java.lang.Object` | `getValue(java.lang.Object src, PropertyPath.Path path)` returns the value specified by the given path from the object
`static java.lang.Object` | `getValue(java.lang.Object src, java.lang.String path)` returns the value specified by the given path from the object
`static void` | `main(java.lang.String[] args)` for testing only
`static boolean` | `setValue(java.lang.Object src, PropertyPath.Path path, java.lang.Object value)` set the given value specified by the given path in the object
`static void` | `setValue(java.lang.Object src, java.lang.String path, java.lang.Object value)` set the given value specified by the given path in the object

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

Constructor Detail

### PropertyPath

    public PropertyPath()

Method Detail

### find

    public static weka.core.PropertyPath.PropertyContainer find(java.lang.Object src,
                                                                PropertyPath.Path path)

  returns the property and object associated with the given path, null if a problem occurred.

  Parameters:
    `src` - the object to start from
    `path` - the path to follow
  Returns:
    not null, if the property could be found

### getPropertyDescriptor

    public static java.beans.PropertyDescriptor getPropertyDescriptor(java.lang.Object src,
                                                                      PropertyPath.Path path)

  returns the property associated with the given path, null if a problem occurred.

  Parameters:
    `src` - the object to start from
    `path` - the path to follow
  Returns:
    not null, if the property could be found

### getPropertyDescriptor

    public static java.beans.PropertyDescriptor getPropertyDescriptor(java.lang.Object src,
                                                                      java.lang.String path)

  returns the property associated with the given path

  Parameters:
    `src` - the object to start from
    `path` - the path to follow
  Returns:
    not null, if the property could be found

### getValue

    public static java.lang.Object getValue(java.lang.Object src,
                                            PropertyPath.Path path)

  returns the value specified by the given path from the object

  Parameters:
    `src` - the object to work on
    `path` - the retrieval path
  Returns:
    the value, null if an error occurred

### getValue

    public static java.lang.Object getValue(java.lang.Object src,
                                            java.lang.String path)

  returns the value specified by the given path from the object

  Parameters:
    `src` - the object to work on
    `path` - the retrieval path
  Returns:
    the value, null if an error occurred

### setValue

    public static boolean setValue(java.lang.Object src,
                                   PropertyPath.Path path,
                                   java.lang.Object value)

  set the given value specified by the given path in the object

  Parameters:
    `src` - the object to work on
    `path` - the retrieval path
    `value` - the value to set
  Returns:
    true if the value could be set

### setValue

    public static void setValue(java.lang.Object src,
                                java.lang.String path,
                                java.lang.Object value)

  set the given value specified by the given path in the object

  Parameters:
    `src` - the object to work on
    `path` - the retrieval path
    `value` - the value to set

### 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

  for testing only

  Parameters:
    `args` - the commandline options - ignored
  Throws:
    `java.lang.Exception` - if something goes wrong

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