Class Rectangle

java.lang.Object
java.awt.geom.RectangularShape
java.awt.geom.Rectangle2D
java.awt.Rectangle
All Implemented Interfaces:
Shape, Serializable, Cloneable
Direct Known Subclasses:
DefaultCaret
public class Rectangle extends Rectangle2D implements Shape, Serializable
A Rectangle specifies an area in a coordinate space that is enclosed by the Rectangle object's upper-left point (x,y) in the coordinate space, its width, and its height.

A Rectangle object's width and height are public fields. The constructors that create a Rectangle, and the methods that can modify one, do not prevent setting a negative value for width or height.

A Rectangle whose width or height is exactly zero has location along those axes with zero dimension, but is otherwise considered empty. The isEmpty() method will return true for such a Rectangle. Methods which test if an empty Rectangle contains or intersects a point or rectangle will always return false if either dimension is zero. Methods which combine such a Rectangle with a point or rectangle will include the location of the Rectangle on that axis in the result as if the add(Point) method were being called.

A Rectangle whose width or height is negative has neither location nor dimension along those axes with negative dimensions. Such a Rectangle is treated as non-existent along those axes. Such a Rectangle is also empty with respect to containment calculations and methods which test if it contains or intersects a point or rectangle will always return false. Methods which combine such a Rectangle with a point or rectangle will ignore the Rectangle entirely in generating the result. If two Rectangle objects are combined and each has a negative dimension, the result will have at least one negative dimension.

Methods which affect only the location of a Rectangle will operate on its location regardless of whether or not it has a negative or zero dimension along either axis.

Note that a Rectangle constructed with the default no-argument constructor will have dimensions of 0x0 and therefore be empty. That Rectangle will still have a location of (0,0) and will contribute that location to the union and add operations. Code attempting to accumulate the bounds of a set of points should therefore initially construct the Rectangle with a specifically negative width and height or it should use the first point in the set to construct the Rectangle. For example: 


     Rectangle bounds = new Rectangle(0, 0, -1, -1);
     for (int i = 0; i < points.length; i++) {
         bounds.add(points[i]);
     }
or if we know that the points array contains at least one point: 

     Rectangle bounds = new Rectangle(points[0]);
     for (int i = 1; i < points.length; i++) {
         bounds.add(points[i]);
     }

This class uses 32-bit integers to store its location and dimensions. Frequently operations may produce a result that exceeds the range of a 32-bit integer. The methods will calculate their results in a way that avoids any 32-bit overflow for intermediate results and then choose the best representation to store the final results back into the 32-bit fields which hold the location and dimensions. The location of the result will be stored into the x and y fields by clipping the true result to the nearest 32-bit value. The values stored into the width and height dimension fields will be chosen as the 32-bit values that encompass the largest part of the true result as possible. Generally this means that the dimension will be clipped independently to the range of 32-bit integers except that if the location had to be moved to store it into its pair of 32-bit fields then the dimensions will be adjusted relative to the "best representation" of the location. If the true result had a negative dimension and was therefore non-existent along one or both axes, the stored dimensions will be negative numbers in those axes. If the true result had a location that could be represented within the range of 32-bit integers, but zero dimension along one or both axes, then the stored dimensions will be zero in those axes.

Since:
1.0
See Also:

Nested Class Summary

Nested classes/interfaces declared in class java.awt.geom.Rectangle2D

Rectangle2D.Double, Rectangle2D.Float

Field Summary

Modifier and Type Field Description
int height
The height of the Rectangle.
int width
The width of the Rectangle.
int x
The X coordinate of the upper-left corner of the Rectangle.
int y
The Y coordinate of the upper-left corner of the Rectangle.

Fields declared in class java.awt.geom.Rectangle2D

OUT_BOTTOM, OUT_LEFT, OUT_RIGHT, OUT_TOP

Constructor Summary

Constructor Description
Rectangle()
Constructs a new Rectangle whose upper-left corner is at (0, 0) in the coordinate space, and whose width and height are both zero.
Rectangle(int width, int height)
Constructs a new Rectangle whose upper-left corner is at (0, 0) in the coordinate space, and whose width and height are specified by the arguments of the same name.
Rectangle(int x, int y, int width, int height)
Constructs a new Rectangle whose upper-left corner is specified as (x,y) and whose width and height are specified by the arguments of the same name.
Rectangle(Dimension d)
Constructs a new Rectangle whose top left corner is (0, 0) and whose width and height are specified by the Dimension argument.
Rectangle(Point p)
Constructs a new Rectangle whose upper-left corner is the specified Point, and whose width and height are both zero.
Rectangle(Point p, Dimension d)
Constructs a new Rectangle whose upper-left corner is specified by the Point argument, and whose width and height are specified by the Dimension argument.
Rectangle(Rectangle r)
Constructs a new Rectangle, initialized to match the values of the specified Rectangle.

Method Summary

Modifier and Type Method Description
void add(int newx, int newy)
Adds a point, specified by the integer arguments newx,newy to the bounds of this Rectangle.
void add(Point pt)
Adds the specified Point to the bounds of this Rectangle.
void add(Rectangle r)
Adds a Rectangle to this Rectangle.
boolean contains(int x, int y)
Checks whether or not this Rectangle contains the point at the specified location (x,y).
boolean contains(int X, int Y, int W, int H)
Checks whether this Rectangle entirely contains the Rectangle at the specified location (X,Y) with the specified dimensions (W,H).
boolean contains(Point p)
Checks whether or not this Rectangle contains the specified Point.
boolean contains(Rectangle r)
Checks whether or not this Rectangle entirely contains the specified Rectangle.
Rectangle2D createIntersection(Rectangle2D r)
Returns a new Rectangle2D object representing the intersection of this Rectangle2D with the specified Rectangle2D.
Rectangle2D createUnion(Rectangle2D r)
Returns a new Rectangle2D object representing the union of this Rectangle2D with the specified Rectangle2D.
boolean equals(Object obj)
Checks whether two rectangles are equal.
Rectangle getBounds()
Gets the bounding Rectangle of this Rectangle.
Rectangle2D getBounds2D()
Returns a high precision and more accurate bounding box of the Shape than the getBounds method.
double getHeight()
Returns the height of the bounding Rectangle in double precision.
Point getLocation()
Returns the location of this Rectangle.
Dimension getSize()
Gets the size of this Rectangle, represented by the returned Dimension.
double getWidth()
Returns the width of the bounding Rectangle in double precision.
double getX()
Returns the X coordinate of the bounding Rectangle in double precision.
double getY()
Returns the Y coordinate of the bounding Rectangle in double precision.
void grow(int h, int v)
Resizes the Rectangle both horizontally and vertically.
boolean inside(int X, int Y)
Deprecated.
As of JDK version 1.1, replaced by contains(int, int).
Rectangle intersection(Rectangle r)
Computes the intersection of this Rectangle with the specified Rectangle.
boolean intersects(Rectangle r)
Determines whether or not this Rectangle and the specified Rectangle intersect.
boolean isEmpty()
Determines whether the RectangularShape is empty.
void move(int x, int y)
Deprecated.
As of JDK version 1.1, replaced by setLocation(int, int).
int outcode(double x, double y)
Determines where the specified coordinates lie with respect to this Rectangle2D.
void reshape(int x, int y, int width, int height)
Deprecated.
As of JDK version 1.1, replaced by setBounds(int, int, int, int).
void resize(int width, int height)
Deprecated.
As of JDK version 1.1, replaced by setSize(int, int).
void setBounds(int x, int y, int width, int height)
Sets the bounding Rectangle of this Rectangle to the specified x, y, width, and height.
void setBounds(Rectangle r)
Sets the bounding Rectangle of this Rectangle to match the specified Rectangle.
void setLocation(int x, int y)
Moves this Rectangle to the specified location.
void setLocation(Point p)
Moves this Rectangle to the specified location.
void setRect(double x, double y, double width, double height)
Sets the bounds of this Rectangle to the integer bounds which encompass the specified x, y, width, and height.
void setSize(int width, int height)
Sets the size of this Rectangle to the specified width and height.
void setSize(Dimension d)
Sets the size of this Rectangle to match the specified Dimension.
String toString()
Returns a String representing this Rectangle and its values.
void translate(int dx, int dy)
Translates this Rectangle the indicated distance, to the right along the X coordinate axis, and downward along the Y coordinate axis.
Rectangle union(Rectangle r)
Computes the union of this Rectangle with the specified Rectangle.

Methods declared in class java.awt.geom.Rectangle2D

add, add, add, contains, contains, getPathIterator, getPathIterator, hashCode, intersect, intersects, intersectsLine, intersectsLine, outcode, setFrame, setRect, union

Methods declared in class java.awt.geom.RectangularShape

clone, contains, contains, getCenterX, getCenterY, getFrame, getMaxX, getMaxY, getMinX, getMinY, intersects, setFrame, setFrame, setFrameFromCenter, setFrameFromCenter, setFrameFromDiagonal, setFrameFromDiagonal

Methods declared in class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods declared in interface java.awt.Shape

contains, contains, contains, contains, getPathIterator, getPathIterator, intersects, intersects

Field Details

x

public int x
The X coordinate of the upper-left corner of the Rectangle.
Since:
1.0
See Also:

y

public int y
The Y coordinate of the upper-left corner of the Rectangle.
Since:
1.0
See Also:

width

public int width
The width of the Rectangle.
Since:
1.0
See Also:

height

public int height
The height of the Rectangle.
Since:
1.0
See Also:

Constructor Details

Rectangle

public Rectangle()
Constructs a new Rectangle whose upper-left corner is at (0, 0) in the coordinate space, and whose width and height are both zero.

Rectangle

public Rectangle(Rectangle r)
Constructs a new Rectangle, initialized to match the values of the specified Rectangle.
Parameters:
r - the Rectangle from which to copy initial values to a newly constructed Rectangle
Since:
1.1

Rectangle

public Rectangle(int x, int y, int width, int height)
Constructs a new Rectangle whose upper-left corner is specified as (x,y) and whose width and height are specified by the arguments of the same name.
Parameters:
x - the specified X coordinate
y - the specified Y coordinate
width - the width of the Rectangle
height - the height of the Rectangle
Since:
1.0

Rectangle

public Rectangle(int width, int height)
Constructs a new Rectangle whose upper-left corner is at (0, 0) in the coordinate space, and whose width and height are specified by the arguments of the same name.
Parameters:
width - the width of the Rectangle
height - the height of the Rectangle

Rectangle

public Rectangle(Point p, Dimension d)
Constructs a new Rectangle whose upper-left corner is specified by the Point argument, and whose width and height are specified by the Dimension argument.
Parameters:
p - a Point that is the upper-left corner of the Rectangle
d - a Dimension, representing the width and height of the Rectangle

Rectangle

public Rectangle(Point p)
Constructs a new Rectangle whose upper-left corner is the specified Point, and whose width and height are both zero.
Parameters:
p - a Point that is the top left corner of the Rectangle

Rectangle

public Rectangle(Dimension d)
Constructs a new Rectangle whose top left corner is (0, 0) and whose width and height are specified by the Dimension argument.
Parameters:
d - a Dimension, specifying width and height

Method Details

getX

public double getX()
Returns the X coordinate of the bounding Rectangle in double precision.
Specified by:
getX in class RectangularShape
Returns:
the X coordinate of the bounding Rectangle.

getY

public double getY()
Returns the Y coordinate of the bounding Rectangle in double precision.
Specified by:
getY in class RectangularShape
Returns:
the Y coordinate of the bounding Rectangle.

getWidth

public double getWidth()
Returns the width of the bounding Rectangle in double precision.
Specified by:
getWidth in class RectangularShape
Returns:
the width of the bounding Rectangle.

getHeight

public double getHeight()
Returns the height of the bounding Rectangle in double precision.
Specified by:
getHeight in class RectangularShape
Returns:
the height of the bounding Rectangle.

getBounds

public Rectangle getBounds()
Gets the bounding Rectangle of this Rectangle.

This method is included for completeness, to parallel the getBounds method of Component.

Specified by:
getBounds in interface Shape
Overrides:
getBounds in class RectangularShape
Returns:
a new Rectangle, equal to the bounding Rectangle for this Rectangle.
Since:
1.1
See Also:

getBounds2D

public Rectangle2D getBounds2D()
Returns a high precision and more accurate bounding box of the Shape than the getBounds method. Note that there is no guarantee that the returned Rectangle2D is the smallest bounding box that encloses the Shape, only that the Shape lies entirely within the indicated Rectangle2D. The bounding box returned by this method is usually tighter than that returned by the getBounds method and never fails due to overflow problems since the return value can be an instance of the Rectangle2D that uses double precision values to store the dimensions.

Note that the definition of insideness can lead to situations where points on the defining outline of the shape may not be considered contained in the returned bounds object, but only in cases where those points are also not considered contained in the original shape.

If a point is inside the shape according to the contains(point) method, then it must be inside the returned Rectangle2D bounds object according to the contains(point) method of the bounds. Specifically:

shape.contains(p) requires bounds.contains(p)

If a point is not inside the shape, then it might still be contained in the bounds object:

bounds.contains(p) does not imply shape.contains(p)

Specified by:
getBounds2D in interface Shape
Overrides:
getBounds2D in class Rectangle2D
Returns:
an instance of Rectangle2D that is a high-precision bounding box of the Shape.
Since:
1.2
See Also:

setBounds

public void setBounds(Rectangle r)
Sets the bounding Rectangle of this Rectangle to match the specified Rectangle.

This method is included for completeness, to parallel the setBounds method of Component.

Parameters:
r - the specified Rectangle
Since:
1.1
See Also:

setBounds

public void setBounds(int x, int y, int width, int height)
Sets the bounding Rectangle of this Rectangle to the specified x, y, width, and height.

This method is included for completeness, to parallel the setBounds method of Component.

Parameters:
x - the new X coordinate for the upper-left corner of this Rectangle
y - the new Y coordinate for the upper-left corner of this Rectangle
width - the new width for this Rectangle
height - the new height for this Rectangle
Since:
1.1
See Also:

setRect

public void setRect(double x, double y, double width, double height)
Sets the bounds of this Rectangle to the integer bounds which encompass the specified x, y, width, and height. If the parameters specify a Rectangle that exceeds the maximum range of integers, the result will be the best representation of the specified Rectangle intersected with the maximum integer bounds.
Specified by:
setRect in class Rectangle2D
Parameters:
x - the X coordinate of the upper-left corner of the specified rectangle
y - the Y coordinate of the upper-left corner of the specified rectangle
width - the width of the specified rectangle
height - the new height of the specified rectangle

reshape

@Deprecated public void reshape(int x, int y, int width, int height)
Deprecated.
As of JDK version 1.1, replaced by setBounds(int, int, int, int).
Sets the bounding Rectangle of this Rectangle to the specified x, y, width, and height.
Parameters:
x - the new X coordinate for the upper-left corner of this Rectangle
y - the new Y coordinate for the upper-left corner of this Rectangle
width - the new width for this Rectangle
height - the new height for this Rectangle

getLocation

public Point getLocation()
Returns the location of this Rectangle.

This method is included for completeness, to parallel the getLocation method of Component.

Returns:
the Point that is the upper-left corner of this Rectangle.
Since:
1.1
See Also:

setLocation

public void setLocation(Point p)
Moves this Rectangle to the specified location.

This method is included for completeness, to parallel the setLocation method of Component.

Parameters:
p - the Point specifying the new location for this Rectangle
Since:
1.1
See Also:

setLocation

public void setLocation(int x, int y)
Moves this Rectangle to the specified location.

This method is included for completeness, to parallel the setLocation method of Component.

Parameters:
x - the X coordinate of the new location
y - the Y coordinate of the new location
Since:
1.1
See Also:

move

@Deprecated public void move(int x, int y)
Deprecated.
As of JDK version 1.1, replaced by setLocation(int, int).
Moves this Rectangle to the specified location.
Parameters:
x - the X coordinate of the new location
y - the Y coordinate of the new location

translate

public void translate(int dx, int dy)
Translates this Rectangle the indicated distance, to the right along the X coordinate axis, and downward along the Y coordinate axis.
Parameters:
dx - the distance to move this Rectangle along the X axis
dy - the distance to move this Rectangle along the Y axis
See Also:

getSize

public Dimension getSize()
Gets the size of this Rectangle, represented by the returned Dimension.

This method is included for completeness, to parallel the getSize method of Component.

Returns:
a Dimension, representing the size of this Rectangle.
Since:
1.1
See Also:

setSize

public void setSize(Dimension d)
Sets the size of this Rectangle to match the specified Dimension.

This method is included for completeness, to parallel the setSize method of Component.

Parameters:
d - the new size for the Dimension object
Since:
1.1
See Also:

setSize

public void setSize(int width, int height)
Sets the size of this Rectangle to the specified width and height.

This method is included for completeness, to parallel the setSize method of Component.

Parameters:
width - the new width for this Rectangle
height - the new height for this Rectangle
Since:
1.1
See Also:

resize

@Deprecated public void resize(int width, int height)
Deprecated.
As of JDK version 1.1, replaced by setSize(int, int).
Sets the size of this Rectangle to the specified width and height.
Parameters:
width - the new width for this Rectangle
height - the new height for this Rectangle

contains

public boolean contains(Point p)
Checks whether or not this Rectangle contains the specified Point.
Parameters:
p - the Point to test
Returns:
true if the specified Point is inside this Rectangle; false otherwise.
Since:
1.1

contains

public boolean contains(int x, int y)
Checks whether or not this Rectangle contains the point at the specified location (x,y).
Parameters:
x - the specified X coordinate
y - the specified Y coordinate
Returns:
true if the point (x,y) is inside this Rectangle; false otherwise.
Since:
1.1

contains

public boolean contains(Rectangle r)
Checks whether or not this Rectangle entirely contains the specified Rectangle.
Parameters:
r - the specified Rectangle
Returns:
true if the Rectangle is contained entirely inside this Rectangle; false otherwise
Since:
1.2

contains

public boolean contains(int X, int Y, int W, int H)
Checks whether this Rectangle entirely contains the Rectangle at the specified location (X,Y) with the specified dimensions (W,H).
Parameters:
X - the specified X coordinate
Y - the specified Y coordinate
W - the width of the Rectangle
H - the height of the Rectangle
Returns:
true if the Rectangle specified by (X, Y, W, H) is entirely enclosed inside this Rectangle; false otherwise.
Since:
1.1

inside

@Deprecated public boolean inside(int X, int Y)
Deprecated.
As of JDK version 1.1, replaced by contains(int, int).
Checks whether or not this Rectangle contains the point at the specified location (X,Y).
Parameters:
X - the specified X coordinate
Y - the specified Y coordinate
Returns:
true if the point (X,Y) is inside this Rectangle; false otherwise.

intersects

public boolean intersects(Rectangle r)
Determines whether or not this Rectangle and the specified Rectangle intersect. Two rectangles intersect if their intersection is nonempty.
Parameters:
r - the specified Rectangle
Returns:
true if the specified Rectangle and this Rectangle intersect; false otherwise.

intersection

public Rectangle intersection(Rectangle r)
Computes the intersection of this Rectangle with the specified Rectangle. Returns a new Rectangle that represents the intersection of the two rectangles. If the two rectangles do not intersect, the result will be an empty rectangle.
Parameters:
r - the specified Rectangle
Returns:
the largest Rectangle contained in both the specified Rectangle and in this Rectangle; or if the rectangles do not intersect, an empty rectangle.

union

public Rectangle union(Rectangle r)
Computes the union of this Rectangle with the specified Rectangle. Returns a new Rectangle that represents the union of the two rectangles.

If either Rectangle has any dimension less than zero the rules for non-existent rectangles apply. If only one has a dimension less than zero, then the result will be a copy of the other Rectangle. If both have dimension less than zero, then the result will have at least one dimension less than zero.

If the resulting Rectangle would have a dimension too large to be expressed as an int, the result will have a dimension of Integer.MAX_VALUE along that dimension.

Parameters:
r - the specified Rectangle
Returns:
the smallest Rectangle containing both the specified Rectangle and this Rectangle.

add

public void add(int newx, int newy)
Adds a point, specified by the integer arguments newx,newy to the bounds of this Rectangle.

If this Rectangle has any dimension less than zero, the rules for non-existent rectangles apply. In that case, the new bounds of this Rectangle will have a location equal to the specified coordinates and width and height equal to zero.

After adding a point, a call to contains with the added point as an argument does not necessarily return true. The contains method does not return true for points on the right or bottom edges of a Rectangle. Therefore, if the added point falls on the right or bottom edge of the enlarged Rectangle, contains returns false for that point. If the specified point must be contained within the new Rectangle, a 1x1 rectangle should be added instead: 

     r.add(new Rectangle(newx, newy, 1, 1));
Parameters:
newx - the X coordinate of the new point
newy - the Y coordinate of the new point

add

public void add(Point pt)
Adds the specified Point to the bounds of this Rectangle.

If this Rectangle has any dimension less than zero, the rules for non-existent rectangles apply. In that case, the new bounds of this Rectangle will have a location equal to the coordinates of the specified Point and width and height equal to zero.

After adding a Point, a call to contains with the added Point as an argument does not necessarily return true. The contains method does not return true for points on the right or bottom edges of a Rectangle. Therefore if the added Point falls on the right or bottom edge of the enlarged Rectangle, contains returns false for that Point. If the specified point must be contained within the new Rectangle, a 1x1 rectangle should be added instead: 

     r.add(new Rectangle(pt, new Dimension(1, 1)));
Parameters:
pt - the new Point to add to this Rectangle

add

public void add(Rectangle r)
Adds a Rectangle to this Rectangle. The resulting Rectangle is the union of the two rectangles.

If either Rectangle has any dimension less than 0, the result will have the dimensions of the other Rectangle. If both Rectangles have at least one dimension less than 0, the result will have at least one dimension less than 0.

If either Rectangle has one or both dimensions equal to 0, the result along those axes with 0 dimensions will be equivalent to the results obtained by adding the corresponding origin coordinate to the result rectangle along that axis, similar to the operation of the add(Point) method, but contribute no further dimension beyond that.

If the resulting Rectangle would have a dimension too large to be expressed as an int, the result will have a dimension of Integer.MAX_VALUE along that dimension.

Parameters:
r - the specified Rectangle

grow

public void grow(int h, int v)
Resizes the Rectangle both horizontally and vertically.

This method modifies the Rectangle so that it is h units larger on both the left and right side, and v units larger at both the top and bottom.

The new Rectangle has (x - h, y - v) as its upper-left corner, width of (width + 2h), and a height of (height + 2v).

If negative values are supplied for h and v, the size of the Rectangle decreases accordingly. The grow method will check for integer overflow and underflow, but does not check whether the resulting values of width and height grow from negative to non-negative or shrink from non-negative to negative.

Parameters:
h - the horizontal expansion
v - the vertical expansion

isEmpty

public boolean isEmpty()
Determines whether the RectangularShape is empty. When the RectangularShape is empty, it encloses no area.
Specified by:
isEmpty in class RectangularShape
Returns:
true if the RectangularShape is empty; false otherwise.
Since:
1.2

outcode

public int outcode(double x, double y)
Determines where the specified coordinates lie with respect to this Rectangle2D. This method computes a binary OR of the appropriate mask values indicating, for each side of this Rectangle2D, whether or not the specified coordinates are on the same side of the edge as the rest of this Rectangle2D.
Specified by:
outcode in class Rectangle2D
Parameters:
x - the specified X coordinate
y - the specified Y coordinate
Returns:
the logical OR of all appropriate out codes.
Since:
1.2
See Also:

createIntersection

public Rectangle2D createIntersection(Rectangle2D r)
Returns a new Rectangle2D object representing the intersection of this Rectangle2D with the specified Rectangle2D.
Specified by:
createIntersection in class Rectangle2D
Parameters:
r - the Rectangle2D to be intersected with this Rectangle2D
Returns:
the largest Rectangle2D contained in both the specified Rectangle2D and in this Rectangle2D.
Since:
1.2

createUnion

public Rectangle2D createUnion(Rectangle2D r)
Returns a new Rectangle2D object representing the union of this Rectangle2D with the specified Rectangle2D.
Specified by:
createUnion in class Rectangle2D
Parameters:
r - the Rectangle2D to be combined with this Rectangle2D
Returns:
the smallest Rectangle2D containing both the specified Rectangle2D and this Rectangle2D.
Since:
1.2

equals

public boolean equals(Object obj)
Checks whether two rectangles are equal.

The result is true if and only if the argument is not null and is a Rectangle object that has the same upper-left corner, width, and height as this Rectangle.

Overrides:
equals in class Rectangle2D
Parameters:
obj - the Object to compare with this Rectangle
Returns:
true if the objects are equal; false otherwise.
See Also:

toString

public String toString()
Returns a String representing this Rectangle and its values.
Overrides:
toString in class Object
Returns:
a String representing this Rectangle object's coordinate and size values.

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