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 * Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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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 &gt; maximum</code> then an

     * <code>IllegalArgumentException</code> is thrown.

     * Similarly if <code>(minimum &lt;= value &lt;= 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 &lt;= value &lt;= 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 &lt;= value &lt;= 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 &lt;= value &lt;= 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 &lt;= value &lt;= 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 &lt;= value &lt; 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 <a href="#setMinimum(java.lang.Comparable)">

     * <code>setMinimum</code></a> 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.

     *

     * @return the value property

     * @see #setValue

     * @see #getNumber

     */

    public Object getValue() {

        return value;

    }

    /**

     * Sets the current value for this sequence.  If <code>value</code> is

     * <code>null</code>, or not a <code>Number</code>, an

     * <code>IllegalArgumentException</code> is thrown.  No

     * bounds checking is done here; the new value may invalidate the

     * <code>(minimum &lt;= value &lt;= maximum)</code>

     * 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 <code>stepSize</code>.

     * 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

     * <code>(minimum &lt;= value &lt;= maximum)</code> invariant is true

     * before calling the <code>next</code>, <code>previous</code>, or

     * <code>setValue</code> methods.

     * <p>

     * This method fires a <code>ChangeEvent</code> if the value has changed.

     *

     * @param value the current (non <code>null</code>) <code>Number</code>

     *         for this sequence

     * @throws IllegalArgumentException if <code>value</code> is

     *         <code>null</code> or not a <code>Number</code>

     * @see #getNumber

     * @see #getValue

     * @see SpinnerModel#addChangeListener

     */

    public void setValue(Object value) {

        if ((value == null) || !(value instanceof Number)) {

            throw new IllegalArgumentException("illegal value");

        }

        if (!value.equals(this.value)) {

            this.value = (Number)value;

            fireStateChanged();

        }

    }

}