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package com.ui4j.api.util;

/**
 * A point representing a location in {@code (x,y)} coordinate space,
 * specified in integer precision.
 */
public class Point {

    /**
     * The top coordinate of this Point.
     * If no top coordinate is set it will default to 0.
     */
    private int top;

    /**
     * The left coordinate of this Point.
     * If no left coordinate is set it will default to 0.
     */
    private int left;

    /**
     * Constructs and initializes a point at the origin
     * (0, 0) of the coordinate space.
     */
    public Point() {
    }

    /**
     * Constructs and initializes a point at the specified
     * {@code (x,y)} location in the coordinate space.
     * @param top the top coordinate of the newly constructed Point
     * @param left the left coordinate of the newly constructed Point
     */
    public Point(int top, int left) {
        this.top = top;
        this.left = left;
    }

    /**
     * Returns the top coordinate of this Point in
     * int precision.
     * @return the top coordinate of this Point.
     */
    public int getTop() {
        return top;
    }

    /**
     * Sets the top coordinate of this Point.
     * @param    top the top coordinate of the new location
     */
    public void setTop(int top) {
        this.top = top;
    }

    /**
     * Returns the left coordinate of this Point in
     * int precision.
     * @return the left coordinate of this Point.
     */
    public int getLeft() {
        return left;
    }

    /**
     * Sets the left coordinate of this Point.
     * @param    left the left coordinate of the new location
     */
    public void setLeft(int left) {
        this.left = left;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + left;
        result = prime * result + top;
        return result;
    }

    /**
     * Determines whether or not two points are equal. Two instances of
     * Point are equal if the values of their
     * left and top member fields, representing
     * their position in the coordinate space, are the same.
     * @param obj an object to be compared with this Point
     * @return true if the object to be compared is
     *         an instance of Point and has
     *         the same values; false otherwise.
     */
    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        Point other = (Point) obj;
        if (left != other.left)
            return false;
        if (top != other.top)
            return false;
        return true;
    }


    /**
     * Returns a string representation of this point and its location
     * in the {@code (x,y)} coordinate space. This method is
     * intended to be used only for debugging purposes, and the content
     * and format of the returned string may vary between implementations.
     * The returned string may be empty but may not be null.
     *
     * @return  a string representation of this point
     */
    @Override
    public String toString() {
        return "Point [top=" + top + ", left=" + left + "]";
    }
}