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package javax.swing;
import java.util.*;
import java.io.Serializable;
/**
* A <code>SpinnerModel</code> for sequences of numbers.
* The upper and lower bounds of the sequence are defined
* by properties called <code>minimum</code> and
* <code>maximum</code>. The size of the increase or decrease
* computed by the <code>nextValue</code> and
* <code>previousValue</code> methods is defined by a property called
* <code>stepSize</code>. The <code>minimum</code> and
* <code>maximum</code> properties can be <code>null</code>
* 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: <code>Number</code> and
* <code>Comparable</code>, so that all Java numeric types
* may be accommodated. Internally, there's only support for
* values whose type is one of the primitive <code>Number</code> types:
* <code>Double</code>, <code>Float</code>, <code>Long</code>,
* <code>Integer</code>, <code>Short</code>, or <code>Byte</code>.
* <p>
* To create a <code>SpinnerNumberModel</code> for the integer
* range zero to one hundred, with
* fifty as the initial value, one could write:
* <pre>
* Integer value = Integer.valueOf(50);
* Integer min = Integer.valueOf(0);
* Integer max = Integer.valueOf(100);
* Integer step = Integer.valueOf(1);
* SpinnerNumberModel model = new SpinnerNumberModel(value, min, max, step);
* int fifty = model.getNumber().intValue();
* </pre>
* <p>
* 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:
* <pre>
* SpinnerNumberModel model = new SpinnerNumberModel(50, 0, 100, 1);
* </pre>
* <p>
* This model inherits a <code>ChangeListener</code>.
* The <code>ChangeListeners</code> are notified
* whenever the model's <code>value</code>, <code>stepSize</code>,
* <code>minimum</code>, or <code>maximum</code> properties changes.
*
* @see JSpinner
* @see SpinnerModel
* @see AbstractSpinnerModel
* @see SpinnerListModel
* @see SpinnerDateModel
*
* @author Hans Muller
* @since 1.4
*/
@SuppressWarnings("serial") // Superclass is not serializable across versions
public class SpinnerNumberModel extends AbstractSpinnerModel implements Serializable
{
private Number stepSize, value;
// Both minimum and maximum are logically Comparable<? extends
// Number>, but that type is awkward to use since different
// instances of Number are not naturally Comparable. For example,
// a Double implements Comparable<Double> and an Integer
// implements Comparable<Integer>. Neither Integer nor Double will
// have a bridge method for Comparable<Number>. However, it safe
// to cast Comparable<?> to Comparable<Object> since all
// Comparables will have a compare(Object> method, possibly as a
// bridge.
private Comparable<?> minimum, maximum;
/**
* Constructs a <code>SpinnerModel</code> that represents
* a closed sequence of
* numbers from <code>minimum</code> to <code>maximum</code>. The
* <code>nextValue</code> and <code>previousValue</code> methods
* compute elements of the sequence by adding or subtracting
* <code>stepSize</code> respectively. All of the parameters
* must be mutually <code>Comparable</code>, <code>value</code>
* and <code>stepSize</code> must be instances of <code>Integer</code>
* <code>Long</code>, <code>Float</code>, or <code>Double</code>.
* <p>
* The <code>minimum</code> and <code>maximum</code> parameters
* can be <code>null</code> to indicate that the range doesn't
* have an upper or lower bound.
* If <code>value</code> or <code>stepSize</code> is <code>null</code>,
* or if both <code>minimum</code> and <code>maximum</code>
* are specified and <code>minimum > maximum</code> then an
* <code>IllegalArgumentException</code> is thrown.
* Similarly if <code>(minimum <= value <= maximum</code>) is false,
* an <code>IllegalArgumentException</code> is thrown.
*
* @param value the current (non <code>null</code>) value of the model
* @param minimum the first number in the sequence or <code>null</code>
* @param maximum the last number in the sequence or <code>null</code>
* @param stepSize the difference between elements of the sequence
*
* @throws IllegalArgumentException if stepSize or value is
* <code>null</code> or if the following expression is false:
* <code>minimum <= value <= maximum</code>
*/
@SuppressWarnings("unchecked") // Casts to Comparable<Object>
public SpinnerNumberModel(Number value,
Comparable<?> minimum,
Comparable<?> maximum,
Number stepSize) {
if ((value == null) || (stepSize == null)) {
throw new IllegalArgumentException("value and stepSize must be non-null");
}
if (!(((minimum == null) || (((Comparable<Object>)minimum).compareTo(value) <= 0)) &&
((maximum == null) || (((Comparable<Object>)maximum).compareTo(value) >= 0)))) {
throw new IllegalArgumentException("(minimum <= value <= maximum) is false");
}
this.value = value;
this.minimum = minimum;
this.maximum = maximum;
this.stepSize = stepSize;
}
/**
* Constructs a <code>SpinnerNumberModel</code> with the specified
* <code>value</code>, <code>minimum</code>/<code>maximum</code> bounds,
* and <code>stepSize</code>.
*
* @param value the current value of the model
* @param minimum the first number in the sequence
* @param maximum the last number in the sequence
* @param stepSize the difference between elements of the sequence
* @throws IllegalArgumentException if the following expression is false:
* <code>minimum <= value <= maximum</code>
*/
public SpinnerNumberModel(int value, int minimum, int maximum, int stepSize) {
this(Integer.valueOf(value), Integer.valueOf(minimum), Integer.valueOf(maximum), Integer.valueOf(stepSize));
}
/**
* Constructs a <code>SpinnerNumberModel</code> with the specified
* <code>value</code>, <code>minimum</code>/<code>maximum</code> bounds,
* and <code>stepSize</code>.
*
* @param value the current value of the model
* @param minimum the first number in the sequence
* @param maximum the last number in the sequence
* @param stepSize the difference between elements of the sequence
* @throws IllegalArgumentException if the following expression is false:
* <code>minimum <= value <= maximum</code>
*/
public SpinnerNumberModel(double value, double minimum, double maximum, double stepSize) {
this(Double.valueOf(value), Double.valueOf(minimum),
Double.valueOf(maximum), Double.valueOf(stepSize));
}
/**
* Constructs a <code>SpinnerNumberModel</code> with no
* <code>minimum</code> or <code>maximum</code> value,
* <code>stepSize</code> equal to one, and an initial value of zero.
*/
public SpinnerNumberModel() {
this(Integer.valueOf(0), null, null, Integer.valueOf(1));
}
/**
* Changes the lower bound for numbers in this sequence.
* If <code>minimum</code> is <code>null</code>,
* then there is no lower bound. No bounds checking is done here;
* the new <code>minimum</code> value may invalidate the
* <code>(minimum <= value <= maximum)</code>
* invariant enforced by the constructors. This is to simplify updating
* the model, naturally one should ensure that the invariant is true
* before calling the <code>getNextValue</code>,
* <code>getPreviousValue</code>, or <code>setValue</code> methods.
* <p>
* Typically this property is a <code>Number</code> of the same type
* as the <code>value</code> however it's possible to use any
* <code>Comparable</code> with a <code>compareTo</code>
* method for a <code>Number</code> with the same type as the value.
* For example if value was a <code>Long</code>,
* <code>minimum</code> might be a Date subclass defined like this:
* <pre>
* 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));
* }
* }
* </pre>
* <p>
* This method fires a <code>ChangeEvent</code>
* if the <code>minimum</code> has changed.
*
* @param minimum a <code>Comparable</code> that has a
* <code>compareTo</code> method for <code>Number</code>s with
* the same type as <code>value</code>
* @see #getMinimum
* @see #setMaximum
* @see SpinnerModel#addChangeListener
*/
public void setMinimum(Comparable<?> minimum) {
if ((minimum == null) ? (this.minimum != null) : !minimum.equals(this.minimum)) {
this.minimum = minimum;
fireStateChanged();
}
}
/**
* Returns the first number in this sequence.
*
* @return the value of the <code>minimum</code> property
* @see #setMinimum
*/
public Comparable<?> getMinimum() {
return minimum;
}
/**
* Changes the upper bound for numbers in this sequence.
* If <code>maximum</code> is <code>null</code>, then there
* is no upper bound. No bounds checking is done here; the new
* <code>maximum</code> value may invalidate the
* <code>(minimum <= value < maximum)</code>
* invariant enforced by the constructors. This is to simplify updating
* the model, naturally one should ensure that the invariant is true
* before calling the <code>next</code>, <code>previous</code>,
* or <code>setValue</code> methods.
* <p>
* Typically this property is a <code>Number</code> of the same type
* as the <code>value</code> however it's possible to use any
* <code>Comparable</code> with a <code>compareTo</code>
* method for a <code>Number</code> with the same type as the value.
* See {@link #setMinimum(Comparable)} for an example.
* <p>
* This method fires a <code>ChangeEvent</code> if the
* <code>maximum</code> has changed.
*
* @param maximum a <code>Comparable</code> that has a
* <code>compareTo</code> method for <code>Number</code>s with
* the same type as <code>value</code>
* @see #getMaximum
* @see #setMinimum
* @see SpinnerModel#addChangeListener
*/
public void setMaximum(Comparable<?> maximum) {
if ((maximum == null) ? (this.maximum != null) : !maximum.equals(this.maximum)) {
this.maximum = maximum;
fireStateChanged();
}
}
/**
* Returns the last number in the sequence.
*
* @return the value of the <code>maximum</code> property
* @see #setMaximum
*/
public Comparable<?> getMaximum() {
return maximum;
}
/**
* Changes the size of the value change computed by the
* <code>getNextValue</code> and <code>getPreviousValue</code>
* methods. An <code>IllegalArgumentException</code>
* is thrown if <code>stepSize</code> is <code>null</code>.
* <p>
* This method fires a <code>ChangeEvent</code> if the
* <code>stepSize</code> has changed.
*
* @param stepSize the size of the value change computed by the
* <code>getNextValue</code> and <code>getPreviousValue</code> methods
* @see #getNextValue
* @see #getPreviousValue
* @see #getStepSize
* @see SpinnerModel#addChangeListener
*/
public void setStepSize(Number stepSize) {
if (stepSize == null) {
throw new IllegalArgumentException("null stepSize");
}
if (!stepSize.equals(this.stepSize)) {
this.stepSize = stepSize;
fireStateChanged();
}
}
/**
* Returns the size of the value change computed by the
* <code>getNextValue</code>
* and <code>getPreviousValue</code> methods.
*
* @return the value of the <code>stepSize</code> property
* @see #setStepSize
*/
public Number getStepSize() {
return stepSize;
}
@SuppressWarnings("unchecked") // Casts to Comparable<Object>
private Number incrValue(int dir)
{
Number newValue;
if ((value instanceof Float) || (value instanceof Double)) {
double v = value.doubleValue() + (stepSize.doubleValue() * (double)dir);
if (value instanceof Double) {
newValue = Double.valueOf(v);
}
else {
newValue = Float.valueOf((float)v);
}
} else {
long v = value.longValue() + (stepSize.longValue() * (long)dir);
if (value instanceof Long) {
newValue = Long.valueOf(v);
}
else if (value instanceof Integer) {
newValue = Integer.valueOf((int)v);
}
else if (value instanceof Short) {
newValue = Short.valueOf((short)v);
}
else {
newValue = Byte.valueOf((byte)v);
}
}
if ((maximum != null) && (((Comparable<Object>)maximum).compareTo(newValue) < 0)) {
return null;
}
if ((minimum != null) && (((Comparable<Object>)minimum).compareTo(newValue) > 0)) {
return null;
}
else {
return newValue;
}
}
/**
* Returns the next number in the sequence.
*
* @return <code>value + stepSize</code> or <code>null</code> if the sum
* exceeds <code>maximum</code>.
*
* @see SpinnerModel#getNextValue
* @see #getPreviousValue
* @see #setStepSize
*/
public Object getNextValue() {
return incrValue(+1);
}
/**
* Returns the previous number in the sequence.
*
* @return <code>value - stepSize</code>, or
* <code>null</code> if the sum is less
* than <code>minimum</code>.
*
* @see SpinnerModel#getPreviousValue
* @see #getNextValue
* @see #setStepSize
*/
public Object getPreviousValue() {
return incrValue(-1);
}
/**
* Returns the value of the current element of the sequence.
*
* @return the value property
* @see #setValue
*/
public Number getNumber() {
return value;
}
/**
* Returns the value of the current element of the sequence.
*
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