javax.swing

## Class SpinnerNumberModel

- java.lang.Object
- - javax.swing.AbstractSpinnerModel
  - - javax.swing.SpinnerNumberModel

- All Implemented Interfaces:
    Serializable, SpinnerModel

      public class SpinnerNumberModel
      extends AbstractSpinnerModel
      implements Serializable

  A `SpinnerModel` for sequences of numbers. The upper and lower bounds of the sequence are defined by properties called `minimum` and `maximum`. The size of the increase or decrease computed by the `nextValue` and `previousValue` methods is defined by a property called `stepSize`. The `minimum` and `maximum` properties can be `null` to indicate that the sequence has no lower or upper limit. All of the properties in this class are defined in terms of two generic types: `Number` and `Comparable`, so that all Java numeric types may be accommodated. Internally, there's only support for values whose type is one of the primitive `Number` types: `Double`, `Float`, `Long`, `Integer`, `Short`, or `Byte`.

  To create a `SpinnerNumberModel` for the integer range zero to one hundred, with fifty as the initial value, one could write:

       Integer value = new Integer(50);
       Integer min = new Integer(0);
       Integer max = new Integer(100);
       Integer step = new Integer(1);
       SpinnerNumberModel model = new SpinnerNumberModel(value, min, max, step);
       int fifty = model.getNumber().intValue();

  Spinners for integers and doubles are common, so special constructors for these cases are provided. For example to create the model in the previous example, one could also write:

       SpinnerNumberModel model = new SpinnerNumberModel(50, 0, 100, 1);

  This model inherits a `ChangeListener`. The `ChangeListeners` are notified whenever the model's `value`, `stepSize`, `minimum`, or `maximum` properties changes.

  Since:
    1.4
  See Also:
    `JSpinner`, `SpinnerModel`, `AbstractSpinnerModel`, `SpinnerListModel`, `SpinnerDateModel`

- - ### Field Summary

    - ### Fields inherited from class javax.swing.AbstractSpinnerModel

      `listenerList`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `SpinnerNumberModel()` Constructs a `SpinnerNumberModel` with no `minimum` or `maximum` value, `stepSize` equal to one, and an initial value of zero.
    `SpinnerNumberModel(double value, double minimum, double maximum, double stepSize)` Constructs a `SpinnerNumberModel` with the specified `value`, `minimum`/`maximum` bounds, and `stepSize`.
    `SpinnerNumberModel(int value, int minimum, int maximum, int stepSize)` Constructs a `SpinnerNumberModel` with the specified `value`, `minimum`/`maximum` bounds, and `stepSize`.
    `SpinnerNumberModel(Number value, Comparable minimum, Comparable maximum, Number stepSize)` Constructs a `SpinnerModel` that represents a closed sequence of numbers from `minimum` to `maximum`.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `Comparable` | `getMaximum()` Returns the last number in the sequence.
    `Comparable` | `getMinimum()` Returns the first number in this sequence.
    `Object` | `getNextValue()` Returns the next number in the sequence.
    `Number` | `getNumber()` Returns the value of the current element of the sequence.
    `Object` | `getPreviousValue()` Returns the previous number in the sequence.
    `Number` | `getStepSize()` Returns the size of the value change computed by the `getNextValue` and `getPreviousValue` methods.
    `Object` | `getValue()` Returns the value of the current element of the sequence.
    `void` | `setMaximum(Comparable maximum)` Changes the upper bound for numbers in this sequence.
    `void` | `setMinimum(Comparable minimum)` Changes the lower bound for numbers in this sequence.
    `void` | `setStepSize(Number stepSize)` Changes the size of the value change computed by the `getNextValue` and `getPreviousValue` methods.
    `void` | `setValue(Object value)` Sets the current value for this sequence.

    - ### Methods inherited from class javax.swing.AbstractSpinnerModel

      `addChangeListener, fireStateChanged, getChangeListeners, getListeners, removeChangeListener`

    - ### Methods inherited from class java.lang.Object

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

- - ### Constructor Detail

    - #### SpinnerNumberModel

          public SpinnerNumberModel(Number value,
                            Comparable minimum,
                            Comparable maximum,
                            Number stepSize)

      Constructs a `SpinnerModel` that represents a closed sequence of numbers from `minimum` to `maximum`. The `nextValue` and `previousValue` methods compute elements of the sequence by adding or subtracting `stepSize` respectively. All of the parameters must be mutually `Comparable`, `value` and `stepSize` must be instances of `Integer` `Long`, `Float`, or `Double`.

      The `minimum` and `maximum` parameters can be `null` to indicate that the range doesn't have an upper or lower bound. If `value` or `stepSize` is `null`, or if both `minimum` and `maximum` are specified and `mininum > maximum` then an `IllegalArgumentException` is thrown. Similarly if `(minimum <= value <= maximum`) is false, an `IllegalArgumentException` is thrown.

      Parameters:
        `value` - the current (non `null`) value of the model
        `minimum` - the first number in the sequence or `null`
        `maximum` - the last number in the sequence or `null`
        `stepSize` - the difference between elements of the sequence
      Throws:
        `IllegalArgumentException` - if stepSize or value is `null` or if the following expression is false: `minimum <= value <= maximum`

    - #### SpinnerNumberModel

          public SpinnerNumberModel(int value,
                            int minimum,
                            int maximum,
                            int stepSize)

      Constructs a `SpinnerNumberModel` with the specified `value`, `minimum`/`maximum` bounds, and `stepSize`.
      Parameters:
        `value` - the current value of the model
        `minimum` - the first number in the sequence
        `maximum` - the last number in the sequence
        `stepSize` - the difference between elements of the sequence
      Throws:
        `IllegalArgumentException` - if the following expression is false: `minimum <= value <= maximum`

    - #### SpinnerNumberModel

          public SpinnerNumberModel(double value,
                            double minimum,
                            double maximum,
                            double stepSize)

      Constructs a `SpinnerNumberModel` with the specified `value`, `minimum`/`maximum` bounds, and `stepSize`.
      Parameters:
        `value` - the current value of the model
        `minimum` - the first number in the sequence
        `maximum` - the last number in the sequence
        `stepSize` - the difference between elements of the sequence
      Throws:
        `IllegalArgumentException` - if the following expression is false: `minimum <= value <= maximum`

    - #### SpinnerNumberModel

          public SpinnerNumberModel()

      Constructs a `SpinnerNumberModel` with no `minimum` or `maximum` value, `stepSize` equal to one, and an initial value of zero.

  - ### Method Detail

    - #### setMinimum

          public void setMinimum(Comparable minimum)

      Changes the lower bound for numbers in this sequence. If `minimum` is `null`, then there is no lower bound. No bounds checking is done here; the new `minimum` value may invalidate the `(minimum <= value <= maximum)` invariant enforced by the constructors. This is to simplify updating the model, naturally one should ensure that the invariant is true before calling the `getNextValue`, `getPreviousValue`, or `setValue` methods.

      Typically this property is a `Number` of the same type as the `value` however it's possible to use any `Comparable` with a `compareTo` method for a `Number` with the same type as the value. For example if value was a `Long`, `minimum` might be a Date subclass defined like this:

           MyDate extends Date {  // Date already implements Comparable
               public int compareTo(Long o) {
                   long t = getTime();
                   return (t < o.longValue() ? -1 : (t == o.longValue() ? 0 : 1));
               }
           }

      This method fires a `ChangeEvent` if the `minimum` has changed.

      Parameters:
        `minimum` - a `Comparable` that has a `compareTo` method for `Number`s with the same type as `value`
      See Also:
        `getMinimum()`, `setMaximum(java.lang.Comparable)`, `SpinnerModel.addChangeListener(javax.swing.event.ChangeListener)`

    - #### getMinimum

          public Comparable getMinimum()

      Returns the first number in this sequence.
      Returns:
        the value of the `minimum` property
      See Also:
        `setMinimum(java.lang.Comparable)`

    - #### setMaximum

          public void setMaximum(Comparable maximum)

      Changes the upper bound for numbers in this sequence. If `maximum` is `null`, then there is no upper bound. No bounds checking is done here; the new `maximum` value may invalidate the `(minimum <= value < maximum)` invariant enforced by the constructors. This is to simplify updating the model, naturally one should ensure that the invariant is true before calling the `next`, `previous`, or `setValue` methods.

      Typically this property is a `Number` of the same type as the `value` however it's possible to use any `Comparable` with a `compareTo` method for a `Number` with the same type as the value. See `setMinimum` for an example.

      This method fires a `ChangeEvent` if the `maximum` has changed.

      Parameters:
        `maximum` - a `Comparable` that has a `compareTo` method for `Number`s with the same type as `value`
      See Also:
        `getMaximum()`, `setMinimum(java.lang.Comparable)`, `SpinnerModel.addChangeListener(javax.swing.event.ChangeListener)`

    - #### getMaximum

          public Comparable getMaximum()

      Returns the last number in the sequence.
      Returns:
        the value of the `maximum` property
      See Also:
        `setMaximum(java.lang.Comparable)`

    - #### setStepSize

          public void setStepSize(Number stepSize)

      Changes the size of the value change computed by the `getNextValue` and `getPreviousValue` methods. An `IllegalArgumentException` is thrown if `stepSize` is `null`.

      This method fires a `ChangeEvent` if the `stepSize` has changed.

      Parameters:
        `stepSize` - the size of the value change computed by the `getNextValue` and `getPreviousValue` methods
      See Also:
        `getNextValue()`, `getPreviousValue()`, `getStepSize()`, `SpinnerModel.addChangeListener(javax.swing.event.ChangeListener)`

    - #### getStepSize

          public Number getStepSize()

      Returns the size of the value change computed by the `getNextValue` and `getPreviousValue` methods.
      Returns:
        the value of the `stepSize` property
      See Also:
        `setStepSize(java.lang.Number)`

    - #### getNextValue

          public Object getNextValue()

      Returns the next number in the sequence.
      Specified by:
        `getNextValue` in interface `SpinnerModel`
      Returns:
        `value + stepSize` or `null` if the sum exceeds `maximum`.
      See Also:
        `SpinnerModel.getNextValue()`, `getPreviousValue()`, `setStepSize(java.lang.Number)`

    - #### getPreviousValue

          public Object getPreviousValue()

      Returns the previous number in the sequence.
      Specified by:
        `getPreviousValue` in interface `SpinnerModel`
      Returns:
        `value - stepSize`, or `null` if the sum is less than `minimum`.
      See Also:
        `SpinnerModel.getPreviousValue()`, `getNextValue()`, `setStepSize(java.lang.Number)`

    - #### getNumber

          public Number getNumber()

      Returns the value of the current element of the sequence.
      Returns:
        the value property
      See Also:
        `setValue(java.lang.Object)`

    - #### getValue

          public Object getValue()

      Returns the value of the current element of the sequence.
      Specified by:
        `getValue` in interface `SpinnerModel`
      Returns:
        the value property
      See Also:
        `setValue(java.lang.Object)`, `getNumber()`

    - #### setValue

          public void setValue(Object value)

      Sets the current value for this sequence. If `value` is `null`, or not a `Number`, an `IllegalArgumentException` is thrown. No bounds checking is done here; the new value may invalidate the `(minimum <= value <= maximum)` invariant enforced by the constructors. It's also possible to set the value to be something that wouldn't naturally occur in the sequence, i.e. a value that's not modulo the `stepSize`. This is to simplify updating the model, and to accommodate spinners that don't want to restrict values that have been directly entered by the user. Naturally, one should ensure that the `(minimum <= value <= maximum)` invariant is true before calling the `next`, `previous`, or `setValue` methods.

      This method fires a `ChangeEvent` if the value has changed.

      Specified by:
        `setValue` in interface `SpinnerModel`
      Parameters:
        `value` - the current (non `null`) `Number` for this sequence
      Throws:
        `IllegalArgumentException` - if `value` is `null` or not a `Number`
      See Also:
        `getNumber()`, `getValue()`, `SpinnerModel.addChangeListener(javax.swing.event.ChangeListener)`

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