/*
 * This file is part of Nuts Framework.
 * Copyright(C) 2009-2012 Nuts Develop Team.
 *
 * Nuts Framework is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License any later version.
 * 
 * Nuts Framework 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Nuts Framework. If not, see <http://www.gnu.org/licenses/>.
 */
package nuts.core.lang.mutable;

/**
 * A mutable <code>float</code> wrapper.
 * <p>
 * Note that as MutableFloat does not extend Float, it is not treated by String.format as a Float parameter. 
 * 
 */
public class MutableFloat extends Number implements Comparable<MutableFloat>, Mutable<Number> {

    /**
     * Required for serialization support.
     * 
     * @see java.io.Serializable
     */
    private static final long serialVersionUID = 5787169186L;

    /** The mutable value. */
    private float value;

    /**
     * Constructs a new MutableFloat with the default value of zero.
     */
    public MutableFloat() {
        super();
    }

    /**
     * Constructs a new MutableFloat with the specified value.
     * 
     * @param value  the initial value to store
     */
    public MutableFloat(float value) {
        super();
        this.value = value;
    }

    /**
     * Constructs a new MutableFloat with the specified value.
     * 
     * @param value  the initial value to store, not null
     * @throws NullPointerException if the object is null
     */
    public MutableFloat(Number value) {
        super();
        this.value = value.floatValue();
    }

    /**
     * Constructs a new MutableFloat parsing the given string.
     * 
     * @param value  the string to parse, not null
     * @throws NumberFormatException if the string cannot be parsed into a float
     * @since 2.5
     */
    public MutableFloat(String value) throws NumberFormatException {
        super();
        this.value = Float.parseFloat(value);
    }

    //-----------------------------------------------------------------------
    /**
     * Gets the value as a Float instance.
     * 
     * @return the value as a Float, never null
     */
    public Float getValue() {
        return Float.valueOf(this.value);
    }

    /**
     * Sets the value.
     * 
     * @param value  the value to set
     */
    public void setValue(float value) {
        this.value = value;
    }

    /**
     * Sets the value from any Number instance.
     * 
     * @param value  the value to set, not null
     * @throws NullPointerException if the object is null
     */
    public void setValue(Number value) {
        this.value = value.floatValue();
    }

    //-----------------------------------------------------------------------
    /**
     * Checks whether the float value is the special NaN value.
     * 
     * @return true if NaN
     */
    public boolean isNaN() {
        return Float.isNaN(value);
    }

    /**
     * Checks whether the float value is infinite.
     * 
     * @return true if infinite
     */
    public boolean isInfinite() {
        return Float.isInfinite(value);
    }

    //-----------------------------------------------------------------------
    /**
     * Increments the value.
     *
     * @since Commons Lang 2.2
     */
    public void increment() {
        value++;
    }

    /**
     * Decrements the value.
     *
     * @since Commons Lang 2.2
     */
    public void decrement() {
        value--;
    }

    //-----------------------------------------------------------------------
    /**
     * Adds a value to the value of this instance.
     * 
     * @param operand  the value to add, not null
     * @since Commons Lang 2.2
     */
    public void add(float operand) {
        this.value += operand;
    }

    /**
     * Adds a value to the value of this instance.
     * 
     * @param operand  the value to add, not null
     * @throws NullPointerException if the object is null
     * @since Commons Lang 2.2
     */
    public void add(Number operand) {
        this.value += operand.floatValue();
    }

    /**
     * Subtracts a value from the value of this instance.
     * 
     * @param operand  the value to subtract
     * @since Commons Lang 2.2
     */
    public void subtract(float operand) {
        this.value -= operand;
    }

    /**
     * Subtracts a value from the value of this instance.
     * 
     * @param operand  the value to subtract, not null
     * @throws NullPointerException if the object is null
     * @since Commons Lang 2.2
     */
    public void subtract(Number operand) {
        this.value -= operand.floatValue();
    }

    //-----------------------------------------------------------------------
    // shortValue and byteValue rely on Number implementation
    /**
     * Returns the value of this MutableFloat as an int.
     *
     * @return the numeric value represented by this object after conversion to type int.
     */
    @Override
    public int intValue() {
        return (int) value;
    }

    /**
     * Returns the value of this MutableFloat as a long.
     *
     * @return the numeric value represented by this object after conversion to type long.
     */
    @Override
    public long longValue() {
        return (long) value;
    }

    /**
     * Returns the value of this MutableFloat as a float.
     *
     * @return the numeric value represented by this object after conversion to type float.
     */
    @Override
    public float floatValue() {
        return value;
    }

    /**
     * Returns the value of this MutableFloat as a double.
     *
     * @return the numeric value represented by this object after conversion to type double.
     */
    @Override
    public double doubleValue() {
        return value;
    }

    //-----------------------------------------------------------------------
    /**
     * Gets this mutable as an instance of Float.
     *
     * @return a Float instance containing the value from this mutable, never null
     */
    public Float toFloat() {
        return Float.valueOf(floatValue());
    }

    //-----------------------------------------------------------------------
    /**
     * Compares this object against some other object. The result is <code>true</code> if and only if the argument is
     * not <code>null</code> and is a <code>Float</code> object that represents a <code>float</code> that has the
     * identical bit pattern to the bit pattern of the <code>float</code> represented by this object. For this
     * purpose, two float values are considered to be the same if and only if the method
     * {@link Float#floatToIntBits(float)}returns the same int value when applied to each.
     * <p>
     * Note that in most cases, for two instances of class <code>Float</code>,<code>f1</code> and <code>f2</code>,
     * the value of <code>f1.equals(f2)</code> is <code>true</code> if and only if <blockquote>
     * 
     * <pre>
     *   f1.floatValue() == f2.floatValue()
     * </pre>
     * 
     * </blockquote>
     * <p>
     * also has the value <code>true</code>. However, there are two exceptions:
     * <ul>
     * <li>If <code>f1</code> and <code>f2</code> both represent <code>Float.NaN</code>, then the
     * <code>equals</code> method returns <code>true</code>, even though <code>Float.NaN==Float.NaN</code> has
     * the value <code>false</code>.
     * <li>If <code>f1</code> represents <code>+0.0f</code> while <code>f2</code> represents <code>-0.0f</code>,
     * or vice versa, the <code>equal</code> test has the value <code>false</code>, even though
     * <code>0.0f==-0.0f</code> has the value <code>true</code>.
     * </ul>
     * This definition allows hashtables to operate properly.
     * 
     * @param obj  the object to compare with, null returns false
     * @return <code>true</code> if the objects are the same; <code>false</code> otherwise.
     * @see java.lang.Float#floatToIntBits(float)
     */
    @Override
    public boolean equals(Object obj) {
        return obj instanceof MutableFloat
            && Float.floatToIntBits(((MutableFloat) obj).value) == Float.floatToIntBits(value);
    }

    /**
     * Returns a suitable hash code for this mutable.
     * 
     * @return a suitable hash code
     */
    @Override
    public int hashCode() {
        return Float.floatToIntBits(value);
    }

    //-----------------------------------------------------------------------
    /**
     * Compares this mutable to another in ascending order.
     * 
     * @param other  the other mutable to compare to, not null
     * @return negative if this is less, zero if equal, positive if greater
     */
    public int compareTo(MutableFloat other) {
        float anotherVal = other.value;
        return Float.compare(value, anotherVal);
    }

    //-----------------------------------------------------------------------
    /**
     * Returns the String value of this mutable.
     * 
     * @return the mutable value as a string
     */
    @Override
    public String toString() {
        return String.valueOf(value);
    }

}
