AbstractParameter (ELKI: Environment for DeveLoping KDD-Applications Supported by Index-Structures)

java.lang.Object
- de.lmu.ifi.dbs.elki.utilities.optionhandling.parameters.AbstractParameter<T>

Type Parameters:
T - the type of a possible value (i.e., the type of the option)

All Implemented Interfaces:

Parameter<T>

Direct Known Subclasses:

ClassParameter, DistanceParameter, EnumParameter, FileParameter, Flag, ListParameter, NumberParameter, PatternParameter, RandomParameter, StringParameter
```
public abstract class AbstractParameter<T>
extends Object
implements Parameter<T>
```
Abstract class for specifying a parameter. A parameter is defined as an option having a specific value. See the de.lmu.ifi.dbs.elki.utilities.optionhandling package for documentation!

Field Summary

Fields
Modifier and Type	Field and Description
`protected List<ParameterConstraint<? super T>>`	`constraints` Holds parameter constraints for this parameter.
`protected T`	`defaultValue` The default value of the parameter (may be null).
`private boolean`	`defaultValueTaken` Specifies if the default value of this parameter was taken as parameter value.
`protected T`	`givenValue` The value last passed to this option.
`protected boolean`	`optionalParameter` Specifies if this parameter is an optional parameter.
`protected OptionID`	`optionid` The option name.
`protected String`	`shortDescription` The short description of the option.
`private T`	`value` The value of this option.

Constructor Summary

Constructors
Constructor and Description
`AbstractParameter(OptionID optionID)` Constructs a parameter with the given optionID, and constraints.
`AbstractParameter(OptionID optionID, boolean optional)` Constructs a parameter with the given optionID, constraints, and optional flag.
`AbstractParameter(OptionID optionID, T defaultValue)` Constructs a parameter with the given optionID, constraints, and default value.

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`addConstraint(ParameterConstraint<? super T> constraint)` Add an additional constraint.
`void`	`addConstraints(Collection<? extends ParameterConstraint<? super T>> cs)` Add a collection of constraints.
`T`	`getDefaultValue()` Returns the default value of the parameter.
`String`	`getDefaultValueAsString()` Get the default value as string.
`String`	`getFullDescription()` Returns the extended description of the option which includes the option's type, the short description and the default value (if specified).
`Object`	`getGivenValue()` Get the last given value.
`String`	`getName()` Returns the name of the option.
`OptionID`	`getOptionID()` Return the OptionID of this option.
`String`	`getShortDescription()` Returns the short description of the option.
`abstract String`	`getSyntax()` Returns a string representation of the parameter's type (e.g. an `IntParameter` should return `<int>`).
`T`	`getValue()` Returns the value of the option.
`abstract String`	`getValueAsString()` Get the value as string.
`String`	`getValuesDescription()` Return a string explaining valid values.
`boolean`	`hasDefaultValue()` Checks if this parameter has a default value.
`boolean`	`hasValuesDescription()` Whether this class has a list of default values.
`boolean`	`isDefined()` Returns true if the value of the option is defined, false otherwise.
`boolean`	`isOptional()` Checks if this parameter is an optional parameter.
`boolean`	`isValid(Object obj)` Checks if the given argument is valid for this option.
`protected abstract T`	`parseValue(Object obj)` Parse a given value into the destination type.
`void`	`setDefaultValue(T defaultValue)` Sets the default value of this parameter.
`void`	`setOptional(boolean opt)` Specifies if this parameter is an optional parameter.
`void`	`setShortDescription(String description)` Sets the short description of the option.
`void`	`setValue(Object obj)` Sets the value of the option.
`protected void`	`setValueInternal(T val)` Internal setter for the value.
`boolean`	`tookDefaultValue()` Checks if the default value of this parameter was taken as the actual parameter value.
`boolean`	`tryDefaultValue()` Handle default values for a parameter.
`void`	`useDefaultValue()` Sets the default value of this parameter as the actual value of this parameter.
`protected boolean`	`validate(T obj)` Validate a value after parsing (e.g. do constrain checks!)

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

- Field Detail
  - defaultValue
```
protected T defaultValue
```
    The default value of the parameter (may be null).
  - defaultValueTaken
```
private boolean defaultValueTaken
```
    Specifies if the default value of this parameter was taken as parameter value.
  - optionalParameter
```
protected boolean optionalParameter
```
    Specifies if this parameter is an optional parameter.
  - constraints
```
protected List<ParameterConstraint<? super T>> constraints
```
    Holds parameter constraints for this parameter.
  - optionid
```
protected final OptionID optionid
```
    The option name.
  - shortDescription
```
protected String shortDescription
```
    The short description of the option. An extended description is provided by the method getFullDescription()
  - givenValue
```
protected T givenValue
```
    The value last passed to this option.
  - value
```
private T value
```
    The value of this option.
- Constructor Detail
  - AbstractParameter
```
public AbstractParameter(OptionID optionID,
                 T defaultValue)
```
    Constructs a parameter with the given optionID, constraints, and default value.
    
    Parameters:
    optionID - the unique id of this parameter
    defaultValue - the default value of this parameter (may be null)
  - AbstractParameter
```
public AbstractParameter(OptionID optionID,
                 boolean optional)
```
    Constructs a parameter with the given optionID, constraints, and optional flag.
    
    Parameters:
    optionID - the unique id of this parameter
    optional - specifies if this parameter is an optional parameter
  - AbstractParameter
```
public AbstractParameter(OptionID optionID)
```
    Constructs a parameter with the given optionID, and constraints.
    
    Parameters:
    optionID - the unique id of this parameter
- Method Detail
  - setDefaultValue
```
public void setDefaultValue(T defaultValue)
```
    Description copied from interface: Parameter
    
    Sets the default value of this parameter.
    
    Specified by:
    
    setDefaultValue in interface Parameter<T>
    
    Parameters:
    defaultValue - default value of this parameter
  - hasDefaultValue
```
public boolean hasDefaultValue()
```
    Description copied from interface: Parameter
    
    Checks if this parameter has a default value.
    
    Specified by:
    
    hasDefaultValue in interface Parameter<T>
    
    Returns:
    true, if this parameter has a default value, false otherwise
  - useDefaultValue
```
public void useDefaultValue()
```
    Description copied from interface: Parameter
    
    Sets the default value of this parameter as the actual value of this parameter.
    
    Specified by:
    
    useDefaultValue in interface Parameter<T>
  - tryDefaultValue
```
public boolean tryDefaultValue()
                        throws UnspecifiedParameterException
```
    Description copied from interface: Parameter
    
    Handle default values for a parameter.
    
    Specified by:
    
    tryDefaultValue in interface Parameter<T>
    
    Returns:
    Return code: true if it has a default value, false if it is optional without a default value. Exception if it is a required parameter!
    
    Throws:
    
    UnspecifiedParameterException - If the parameter requires a value
  - setOptional
```
public void setOptional(boolean opt)
```
    Description copied from interface: Parameter
    
    Specifies if this parameter is an optional parameter.
    
    Specified by:
    
    setOptional in interface Parameter<T>
    
    Parameters:
    opt - true if this parameter is optional, false otherwise
  - isOptional
```
public boolean isOptional()
```
    Description copied from interface: Parameter
    
    Checks if this parameter is an optional parameter.
    
    Specified by:
    
    isOptional in interface Parameter<T>
    
    Returns:
    true if this parameter is optional, false otherwise
  - tookDefaultValue
```
public boolean tookDefaultValue()
```
    Description copied from interface: Parameter
    
    Checks if the default value of this parameter was taken as the actual parameter value.
    
    Specified by:
    
    tookDefaultValue in interface Parameter<T>
    
    Returns:
    true, if the default value was taken as actual parameter value, false otherwise
  - isDefined
```
public boolean isDefined()
```
    Description copied from interface: Parameter
    
    Returns true if the value of the option is defined, false otherwise.
    
    Specified by:
    
    isDefined in interface Parameter<T>
    
    Returns:
    true if the value of the option is defined, false otherwise.
  - getDefaultValue
```
public T getDefaultValue()
```
    Description copied from interface: Parameter
    
    Returns the default value of the parameter.
    If the parameter has no default value, the method returns null.
    
    Specified by:
    
    getDefaultValue in interface Parameter<T>
    
    Returns:
    the default value of the parameter, null if the parameter has no default value.
  - hasValuesDescription
```
public boolean hasValuesDescription()
```
    Description copied from interface: Parameter
    
    Whether this class has a list of default values.
    
    Specified by:
    
    hasValuesDescription in interface Parameter<T>
    
    Returns:
    whether the class has a description of valid values.
  - getValuesDescription
```
public String getValuesDescription()
```
    Description copied from interface: Parameter
    
    Return a string explaining valid values.
    
    Specified by:
    
    getValuesDescription in interface Parameter<T>
    
    Returns:
    String explaining valid values (e.g. a class list)
  - getFullDescription
```
public String getFullDescription()
```
    Description copied from interface: Parameter
    
    Returns the extended description of the option which includes the option's type, the short description and the default value (if specified).
    
    Specified by:
    
    getFullDescription in interface Parameter<T>
    
    Returns:
    the option's description.
  - validate
```
protected boolean validate(T obj)
                    throws ParameterException
```
    Validate a value after parsing (e.g. do constrain checks!)
    
    Parameters:
    obj - Object to validate
    
    Returns:
    true iff the object is valid for this parameter.
    
    Throws:
    
    ParameterException - when the object is not valid.
  - getOptionID
```
public OptionID getOptionID()
```
    Description copied from interface: Parameter
    
    Return the OptionID of this option.
    
    Specified by:
    
    getOptionID in interface Parameter<T>
    
    Returns:
    Option ID
  - getName
```
public String getName()
```
    Description copied from interface: Parameter
    
    Returns the name of the option.
    
    Specified by:
    
    getName in interface Parameter<T>
    
    Returns:
    the option's name.
  - getShortDescription
```
public String getShortDescription()
```
    Description copied from interface: Parameter
    
    Returns the short description of the option.
    
    Specified by:
    
    getShortDescription in interface Parameter<T>
    
    Returns:
    the option's short description.
  - setShortDescription
```
public void setShortDescription(String description)
```
    Description copied from interface: Parameter
    
    Sets the short description of the option.
    
    Specified by:
    
    setShortDescription in interface Parameter<T>
    
    Parameters:
    description - the short description to be set
  - setValue
```
public void setValue(Object obj)
              throws ParameterException
```
    Description copied from interface: Parameter
    
    Sets the value of the option.
    
    Specified by:
    
    setValue in interface Parameter<T>
    
    Parameters:
    obj - the option's value to be set
    
    Throws:
    
    ParameterException - if the given value is not a valid value for this option.
  - setValueInternal
```
protected final void setValueInternal(T val)
```
    Internal setter for the value.
    
    Parameters:
    val - Value
  - getValue
```
public final T getValue()
```
    Description copied from interface: Parameter
    
    Returns the value of the option. You should use either Parameterization.grab(de.lmu.ifi.dbs.elki.utilities.optionhandling.parameters.Parameter<?>) or Parameter.isDefined() to test if getValue() will return a well-defined value.
    
    Specified by:
    
    getValue in interface Parameter<T>
    
    Returns:
    the option's value.
  - getGivenValue
```
public Object getGivenValue()
```
    Description copied from interface: Parameter
    
    Get the last given value. May return null
    
    Specified by:
    
    getGivenValue in interface Parameter<T>
    
    Returns:
    Given value
  - isValid
```
public final boolean isValid(Object obj)
                      throws ParameterException
```
    Description copied from interface: Parameter
    
    Checks if the given argument is valid for this option.
    
    Specified by:
    
    isValid in interface Parameter<T>
    
    Parameters:
    obj - option value to be checked
    
    Returns:
    true, if the given value is valid for this option
    
    Throws:
    
    ParameterException - if the given value is not a valid value for this option.
  - getSyntax
```
public abstract String getSyntax()
```
    Description copied from interface: Parameter
    
    Returns a string representation of the parameter's type (e.g. an IntParameter should return <int>).
    
    Specified by:
    
    getSyntax in interface Parameter<T>
    
    Returns:
    a string representation of the parameter's type
  - parseValue
```
protected abstract T parseValue(Object obj)
                         throws ParameterException
```
    Parse a given value into the destination type.
    
    Parameters:
    obj - Object to parse (may be a string representation!)
    
    Returns:
    Parsed object
    
    Throws:
    
    ParameterException - when the object cannot be parsed.
  - getValueAsString
```
public abstract String getValueAsString()
```
    Description copied from interface: Parameter
    
    Get the value as string. May return null
    
    Specified by:
    
    getValueAsString in interface Parameter<T>
    
    Returns:
    Value as string
  - getDefaultValueAsString
```
public String getDefaultValueAsString()
```
    Description copied from interface: Parameter
    
    Get the default value as string.
    
    Specified by:
    
    getDefaultValueAsString in interface Parameter<T>
    
    Returns:
    default value
  - addConstraint
```
public void addConstraint(ParameterConstraint<? super T> constraint)
```
    Description copied from interface: Parameter
    
    Add an additional constraint.
    
    Specified by:
    
    addConstraint in interface Parameter<T>
    
    Parameters:
    constraint - Constraint to add.
  - addConstraints
```
public void addConstraints(Collection<? extends ParameterConstraint<? super T>> cs)
```
    Add a collection of constraints.
    
    Parameters:
    cs - Constraints to add

Class AbstractParameter<T>

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

defaultValue

defaultValueTaken

optionalParameter

constraints

optionid

shortDescription

givenValue

value

Constructor Detail

AbstractParameter

AbstractParameter

AbstractParameter

Method Detail

setDefaultValue

hasDefaultValue

useDefaultValue

tryDefaultValue

setOptional

isOptional

tookDefaultValue

isDefined

getDefaultValue

hasValuesDescription

getValuesDescription

getFullDescription

validate

getOptionID

getName

getShortDescription

setShortDescription

setValue

setValueInternal

getValue

getGivenValue

isValid

getSyntax

parseValue

getValueAsString

getDefaultValueAsString

addConstraint

addConstraints