de.lmu.ifi.dbs.elki.utilities.optionhandling.parameters
Class ClassParameter<C>

java.lang.Object
  de.lmu.ifi.dbs.elki.utilities.optionhandling.parameters.Parameter<Class<?>,Class<? extends C>>
      de.lmu.ifi.dbs.elki.utilities.optionhandling.parameters.ClassParameter<C>

Type Parameters:

C - Class type

Direct Known Subclasses:

ObjectParameter

public class ClassParameter<C>
extends Parameter<Class<?>,Class<? extends C>>

Parameter class for a parameter specifying a class name.

Author:

Steffi Wanka, Erich Schubert

Field Summary

static String	NONBREAKING_SPACE Non-breaking unicode space character.
protected Class<C>	restrictionClass The restriction class for this class parameter.

Fields inherited from class de.lmu.ifi.dbs.elki.utilities.optionhandling.parameters.Parameter

constraints, defaultValue, givenValue, optionalParameter, optionid, shortDescription

Constructor Summary

ClassParameter(OptionID optionID, Class<?> restrictionClass)
Constructs a class parameter with the given optionID, and restriction class.

ClassParameter(OptionID optionID, Class<?> restrictionClass, boolean optional)
Constructs a class parameter with the given optionID, restriction class, and optional flag.

ClassParameter(OptionID optionID, Class<?> restrictionClass, Class<?> defaultValue)
Constructs a class parameter with the given optionID, restriction class, and default value.

Method Summary

IterableIterator<Class<?>>	getKnownImplementations() Get an iterator over all known implementations of the class restriction.
Class<C>	getRestrictionClass() Returns the restriction class of this class parameter.
String[]	getRestrictionClasses() Returns the class names allowed according to the restriction class of this class parameter.
String	getSyntax() Returns a string representation of the parameter's type.
String	getValueAsString() Get the value as string.
String	getValuesDescription() Return a description of known valid classes.
boolean	hasValuesDescription() This class sometimes provides a list of value descriptions.
C	instantiateClass(Parameterization config) Returns a new instance for the value (i.e., the class name) of this class parameter.
protected Class<? extends C>	parseValue(Object obj) Parse a given value into the destination type.
String	restrictionString() Provides a description string listing all classes for the given superclass or interface as specified in the properties.
boolean	validate(Class<? extends C> obj) Checks if the given parameter value is valid for this ClassParameter.

Methods inherited from class de.lmu.ifi.dbs.elki.utilities.optionhandling.parameters.Parameter

getDefaultValue, getFullDescription, getGivenValue, getName, getOptionID, getShortDescription, getValue, hasDefaultValue, isDefined, isOptional, isValid, setDefaultValue, setOptional, setShortDescription, setValue, setValueInternal, tookDefaultValue, tryDefaultValue, useDefaultValue

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

restrictionClass

protected Class<C> restrictionClass

The restriction class for this class parameter.

NONBREAKING_SPACE

public static final String NONBREAKING_SPACE

Non-breaking unicode space character.

See Also:

Constant Field Values

Constructor Detail

ClassParameter

public ClassParameter(OptionID optionID,
                      Class<?> restrictionClass,
                      Class<?> defaultValue)

Constructs a class parameter with the given optionID, restriction class, and default value.

Parameters:

optionID - the unique id of the option

restrictionClass - the restriction class of this class parameter

defaultValue - the default value of this class parameter

ClassParameter

public ClassParameter(OptionID optionID,
                      Class<?> restrictionClass,
                      boolean optional)

Constructs a class parameter with the given optionID, restriction class, and optional flag.

Parameters:

optionID - the unique id of the option

restrictionClass - the restriction class of this class parameter

optional - specifies if this parameter is an optional parameter

ClassParameter

public ClassParameter(OptionID optionID,
                      Class<?> restrictionClass)

Constructs a class parameter with the given optionID, and restriction class.

Parameters:

optionID - the unique id of the option

restrictionClass - the restriction class of this class parameter

Method Detail

parseValue

protected Class<? extends C> parseValue(Object obj)
                                 throws ParameterException

Parse a given value into the destination type.

Specified by:

parseValue in class Parameter<Class<?>,Class<? extends C>>

Parameters:

obj - Object to parse (may be a string representation!)

Returns:

Parsed object

Throws:

ParameterException - when the object cannot be parsed.

validate

public boolean validate(Class<? extends C> obj)
                 throws ParameterException

Checks if the given parameter value is valid for this ClassParameter. If not a parameter exception is thrown.

Overrides:

validate in class Parameter<Class<?>,Class<? extends C>>

Parameters:

obj - Object to validate

Returns:

true iff the object is valid for this parameter.

Throws:

ParameterException - when the object is not valid.

getSyntax

public String getSyntax()

Returns a string representation of the parameter's type.

Specified by:

getSyntax in class Parameter<Class<?>,Class<? extends C>>

Returns:

"<class>"

hasValuesDescription

public boolean hasValuesDescription()

This class sometimes provides a list of value descriptions.

Overrides:

hasValuesDescription in class Parameter<Class<?>,Class<? extends C>>

Returns:

whether the class has a description of valid values.

See Also:

Parameter.hasValuesDescription()

getValuesDescription

public String getValuesDescription()

Return a description of known valid classes.

Overrides:

getValuesDescription in class Parameter<Class<?>,Class<? extends C>>

Returns:

String explaining valid values (e.g. a class list)

See Also:

Parameter.getValuesDescription()

getValueAsString

public String getValueAsString()

Description copied from class: Parameter

Get the value as string. May return null

Specified by:

getValueAsString in class Parameter<Class<?>,Class<? extends C>>

Returns:

Value as string

instantiateClass

public C instantiateClass(Parameterization config)

Returns a new instance for the value (i.e., the class name) of this class parameter. The instance has the type of the restriction class of this class parameter.

If the Class for the class name is not found, the instantiation is tried using the package of the restriction class as package of the class name.

Parameters:

config - Parameterization to use (if Parameterizable))

Returns:

a new instance for the value of this class parameter

getRestrictionClass

public Class<C> getRestrictionClass()

Returns the restriction class of this class parameter.

Returns:

the restriction class of this class parameter.

getKnownImplementations

public IterableIterator<Class<?>> getKnownImplementations()

Get an iterator over all known implementations of the class restriction.

Returns:

Iterable and Iterator object

getRestrictionClasses

public String[] getRestrictionClasses()

Returns the class names allowed according to the restriction class of this class parameter.

Returns:

class names allowed according to the restriction class defined.

restrictionString

public String restrictionString()

Provides a description string listing all classes for the given superclass or interface as specified in the properties.

Returns:

a description string listing all classes for the given superclass or interface as specified in the properties