Package org.apache.sis.geometry
Class AbstractEnvelope
Object
FormattableObject
AbstractEnvelope
 Direct Known Subclasses:
GeneralEnvelope
,ImmutableEnvelope
Default implementations of most
Envelope
methods, leaving the data storage to subclasses.
This base class does not hold any state and does not implement the Serializable
or Cloneable
interfaces. The internal representation, and the choice to be cloneable or
serializable, is left to subclasses.
Implementers needs to define at least the following methods:
All other methods, including toString()
, equals(Object)
and hashCode()
,
are implemented on top of the above four methods.
Crossing the antimeridian of a Geographic CRS
The Web Coverage Service (WCS) specification authorizes (with special treatment) cases where upper < lower at least in the longitude case. They are envelopes crossing the antimeridian, like the red box below (the green box is the usual case). The default implementation of methods listed in the right column can handle such cases.Choosing the range of longitude values
Geographic CRS typically have longitude values in the [180 … +180]° range, but the [0 … 360]° range is also occasionally used. Users of this class need to ensure that this envelope CRS is associated to axes having the desired minimum and maximum value.Note on positive and negative zeros
The IEEE 754 standard defines two different values for positive zero and negative zero. When used with SIS envelopes and keeping in mind the above discussion, those zeros have different meanings: The [0…0]° range is an empty envelope.
 The [0…0]° range makes a full turn around the globe, like the [180…180]° range except that the former range spans across the antimeridian.
 Since:
 0.3
Defined in the sisreferencing
module

Constructor Summary

Method Summary
Modifier and TypeMethodDescriptionstatic AbstractEnvelope
castOrCopy
(Envelope envelope) Returns the given envelope as anAbstractEnvelope
instance.boolean
contains
(DirectPosition position) Tests if a specified coordinate is inside the boundary of this envelope.boolean
Returnstrue
if this envelope completely encloses the specified envelope.boolean
Returnstrue
if this envelope completely encloses the specified envelope.boolean
Returnstrue
if the specified object is an envelope of the same class with equals coordinates and CRS.boolean
Compares to the specified envelope for equality up to the specified tolerance value.protected String
Formats this envelope as a "BOX
" element.abstract double
getLower
(int dimension) Returns the limit in the direction of decreasing coordinate values in the specified dimension.A coordinate position consisting of all the lower coordinate values.double
getMaximum
(int dimension) Returns the maximal coordinate value for the specified dimension.A coordinate position consisting of all the median coordinate values.double
getMedian
(int dimension) Returns the median coordinate along the specified dimension.double
getMinimum
(int dimension) Returns the minimal coordinate value for the specified dimension.double
getSpan
(int dimension) Returns the envelope span (typically width or height) along the specified dimension.double
Returns the envelope span along the specified dimension, in terms of the given units.Returns the time range of the first dimension associated to a temporal CRS.abstract double
getUpper
(int dimension) Returns the limit in the direction of increasing coordinate values in the specified dimension.A coordinate position consisting of all the upper coordinate values.int
Returns a hash value for this envelope.boolean
intersects
(Envelope envelope) Returnstrue
if this envelope intersects the specified envelope.boolean
intersects
(Envelope envelope, boolean touch) Returnstrue
if this envelope intersects or (optionally) touches the specified envelope.boolean
Returnsfalse
if at least one coordinate value is not NaN.boolean
isEmpty()
Determines whether or not this envelope is empty.Envelope[]
Returns this envelope as an array of simple (without wraparound) envelopes.Formats this envelope as a "BOX
" element.Methods inherited from class FormattableObject
print, toString, toWKT
Methods inherited from class Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
Methods inherited from interface Envelope
getCoordinateReferenceSystem, getDimension

Constructor Details

AbstractEnvelope
protected AbstractEnvelope()Constructs an envelope.


Method Details

castOrCopy
Returns the given envelope as anAbstractEnvelope
instance. If the given envelope is already an instance ofAbstractEnvelope
, then it is returned unchanged. Otherwise the coordinate values and the CRS of the given envelope are copied in a new envelope. Parameters:
envelope
 the envelope to cast, ornull
. Returns:
 the values of the given envelope as an
AbstractEnvelope
instance.  See Also:

getLowerCorner
A coordinate position consisting of all the lower coordinate values. The default implementation returns a view over thegetLower(int)
method, so changes in this envelope will be immediately reflected in the returned direct position. If the particular case of theGeneralEnvelope
subclass, the returned position supports also write operations, so changes in the position are reflected back in the envelope.Note: The Web Coverage Service (WCS) 1.1 specification uses an extended interpretation of the bounding box definition. In a WCS 1.1 data structure, the lower corner defines the edges region in the directions of decreasing coordinate values in the envelope CRS. This is usually the algebraic minimum coordinates, but not always. For example, an envelope crossing the antimeridian could have a lower corner longitude greater than the upper corner longitude. Such extended interpretation applies mostly to axes havingWRAPAROUND
range meaning. Specified by:
getLowerCorner
in interfaceEnvelope
 Returns:
 a view over the lower corner, typically (but not necessarily) containing minimal coordinate values.
 See Also:

getUpperCorner
A coordinate position consisting of all the upper coordinate values. The default implementation returns a view over thegetUpper(int)
method, so changes in this envelope will be immediately reflected in the returned direct position. If the particular case of theGeneralEnvelope
subclass, the returned position supports also write operations, so changes in the position are reflected back in the envelope.Note: The Web Coverage Service (WCS) 1.1 specification uses an extended interpretation of the bounding box definition. In a WCS 1.1 data structure, the upper corner defines the edges region in the directions of increasing coordinate values in the envelope CRS. This is usually the algebraic maximum coordinates, but not always. For example, an envelope crossing the antimeridian could have an upper corner longitude less than the lower corner longitude. Such extended interpretation applies mostly to axes havingWRAPAROUND
range meaning. Specified by:
getUpperCorner
in interfaceEnvelope
 Returns:
 a view over the upper corner, typically (but not necessarily) containing maximal coordinate values.
 See Also:

getMedian
A coordinate position consisting of all the median coordinate values. The default implementation returns a view over thegetMedian(int)
method, so changes in this envelope will be immediately reflected in the returned direct position. Returns:
 the median coordinates.
 See Also:

getLower
Returns the limit in the direction of decreasing coordinate values in the specified dimension. This is usually the algebraic minimum, except if this envelope spans the antimeridian. Parameters:
dimension
 the dimension for which to obtain the coordinate value. Returns:
 the starting coordinate value at the given dimension.
 Throws:
IndexOutOfBoundsException
 if the given index is negative or is equals or greater than the envelope dimension. See Also:

getUpper
Returns the limit in the direction of increasing coordinate values in the specified dimension. This is usually the algebraic maximum, except if this envelope spans the antimeridian. Parameters:
dimension
 the dimension for which to obtain the coordinate value. Returns:
 the starting coordinate value at the given dimension.
 Throws:
IndexOutOfBoundsException
 if the given index is negative or is equals or greater than the envelope dimension. See Also:

getMinimum
Returns the minimal coordinate value for the specified dimension. In the typical case of nonempty envelopes not crossing the antimeridian, this method returns thegetLower(int)
value verbatim. In the case of envelope crossing the antimeridian, this method returns the axis minimum value. If the range in the given dimension is invalid, then this method returnsNaN
. Specified by:
getMinimum
in interfaceEnvelope
 Parameters:
dimension
 the dimension for which to obtain the coordinate value. Returns:
 the minimal coordinate value at the given dimension.
 Throws:
IndexOutOfBoundsException
 if the given index is negative or is equals or greater than the envelope dimension.

getMaximum
Returns the maximal coordinate value for the specified dimension. In the typical case of nonempty envelopes not crossing the antimeridian, this method returns thegetUpper(int)
value verbatim. In the case of envelope crossing the antimeridian, this method returns the axis maximum value. If the range in the given dimension is invalid, then this method returnsNaN
. Specified by:
getMaximum
in interfaceEnvelope
 Parameters:
dimension
 the dimension for which to obtain the coordinate value. Returns:
 the maximal coordinate value at the given dimension.
 Throws:
IndexOutOfBoundsException
 if the given index is negative or is equals or greater than the envelope dimension.

getMedian
Returns the median coordinate along the specified dimension. In most cases, the result is equals (minus rounding error) to:median = (getUpper(dimension) + getLower(dimension)) / 2;
Crossing the antimeridian of a Geographic CRS
If upper < lower and the range meaning for the requested dimension is wraparound, then the median calculated above is actually in the middle of the space outside the envelope. In such cases, this method shifts the median value by half of the periodicity (180° in the longitude case) in order to switch from outer space to inner space. If the axis range meaning is notWRAPAROUND
, then this method returnsNaN
. Specified by:
getMedian
in interfaceEnvelope
 Parameters:
dimension
 the dimension for which to obtain the coordinate value. Returns:
 the median coordinate at the given dimension, or
Double.NaN
.  Throws:
IndexOutOfBoundsException
 if the given index is negative or is equals or greater than the envelope dimension. See Also:

getSpan
public double getSpan(int dimension) Returns the envelope span (typically width or height) along the specified dimension. In most cases, the result is equals (minus rounding error) to:span = getUpper(dimension)  getLower(dimension);
Crossing the antimeridian of a Geographic CRS
If upper < lower and the range meaning for the requested dimension is wraparound, then the span calculated above is negative. In such cases, this method adds the periodicity (typically 360° of longitude) to the span. If the result is a positive number, it is returned. Otherwise this method returnsNaN
. Specified by:
getSpan
in interfaceEnvelope
 Parameters:
dimension
 the dimension for which to obtain the span. Returns:
 the span (typically width or height) at the given dimension, or
Double.NaN
.  Throws:
IndexOutOfBoundsException
 if the given index is negative or is equals or greater than the envelope dimension.

getSpan
public double getSpan(int dimension, Unit<?> unit) throws IndexOutOfBoundsException, IncommensurableException Returns the envelope span along the specified dimension, in terms of the given units. The default implementation invokesgetSpan(int)
and converts the result. Parameters:
dimension
 the dimension to query.unit
 the unit for the return value. Returns:
 the span in terms of the given unit.
 Throws:
IndexOutOfBoundsException
 if the given index is out of bounds.IncommensurableException
 if the length can't be converted to the specified units.

getTimeRange
Returns the time range of the first dimension associated to a temporal CRS. This convenience method converts floating point values to instants usingDefaultTemporalCRS.toInstant(double)
. Returns:
 time range in this given envelope.
 Since:
 1.1
 See Also:

toSimpleEnvelopes
Returns this envelope as an array of simple (without wraparound) envelopes. The length of the returned array depends on the number of dimensions where a wraparound range is found. Typically, wraparound occurs only in the range of longitude values, when the range crosses the antimeridian (a.k.a. date line). However this implementation will take in account any axis having wraparound range meaning.Special cases:
 If this envelope is empty, then this method returns an empty array.
 If this envelope does not have any wraparound behavior, then this method returns
this
in an array of length 1. This envelope is not cloned.  If this envelope crosses the antimeridian (a.k.a. date line) then this method returns two separated envelopes covering the same area than this envelopes.
 While uncommon, the envelope could theoretically crosses the limit of other axis having wraparound range meaning. If wraparounds occur along n axes, then this method may return 2ⁿ separated simple envelopes.
 Returns:
 a representation of this envelope as an array of nonempty envelope.
 Since:
 0.4
 See Also:

isEmpty
public boolean isEmpty()Determines whether or not this envelope is empty. An envelope is empty if it has zero dimension, or if the span of at least one axis is negative, 0 orNaN
.Note: Strictly speaking, there is an ambiguity if a span isIfNaN
or if the envelope contains both 0 and infinite spans (since 0⋅∞ =NaN
). In such cases, this method arbitrarily ignores the infinite values and returnstrue
.isEmpty()
returnsfalse
, thenisAllNaN()
is guaranteed to also returnfalse
. However the converse is not always true. 
isAllNaN
public boolean isAllNaN()Returnsfalse
if at least one coordinate value is not NaN. ThisisAllNaN()
check is different than theisEmpty()
check since it returnsfalse
for a partially initialized envelope, whileisEmpty()
returnsfalse
only after all dimensions have been initialized. More specifically, the following rules apply: If
isAllNaN() == true
, thenisEmpty() == true
 If
isEmpty() == false
, thenisAllNaN() == false
 The converse of the abovecited rules are not always true.
 Returns:
true
if this envelope has NaN values. See Also:
 If

contains
Tests if a specified coordinate is inside the boundary of this envelope. Both lower and upper values of this envelope are considered inclusive. If it least one coordinate value in the given point isNaN
, then this method returnsfalse
.Preconditions
This method assumes that the specified point uses a CRS equivalent to this envelope CRS. For performance reasons, it will no be verified unless Java assertions are enabled.Crossing the antimeridian of a Geographic CRS
For any dimension, if upper < lower then this method uses an algorithm which is the opposite of the usual one: rather than testing if the given point is inside the envelope interior, this method tests if the given point is outside the envelope exterior. Parameters:
position
 the point to text. Returns:
true
if the specified coordinate is inside the boundary of this envelope;false
otherwise. Throws:
MismatchedDimensionException
 if the specified point does not have the expected number of dimensions.AssertionError
 if assertions are enabled and the envelopes have mismatched CRS.

contains
Returnstrue
if this envelope completely encloses the specified envelope. The default implementation delegates to:contains(envelope, true)
Preconditions
This method assumes that the specified envelope uses the same CRS than this envelope. For performance reasons, it will no be verified unless Java assertions are enabled.Crossing the antimeridian of a Geographic CRS
For every cases illustrated below, the yellow box is considered completely enclosed in the blue envelope: Parameters:
envelope
 the envelope to test for inclusion. Returns:
true
if this envelope completely encloses the specified one. Throws:
MismatchedDimensionException
 if the specified envelope doesn't have the expected dimension.AssertionError
 if assertions are enabled and the envelopes have mismatched CRS. Since:
 0.4
 See Also:

contains
public boolean contains(Envelope envelope, boolean edgesInclusive) throws MismatchedDimensionException Returnstrue
if this envelope completely encloses the specified envelope. If one or more edges from the specified envelope coincide with an edge from this envelope, then this method returnstrue
only ifedgesInclusive
istrue
.This method is subject to the same preconditions than
contains(Envelope)
, and handles envelopes crossing the antimeridian in the same way. Parameters:
envelope
 the envelope to test for inclusion.edgesInclusive
true
if this envelope edges are inclusive. Returns:
true
if this envelope completely encloses the specified one. Throws:
MismatchedDimensionException
 if the specified envelope doesn't have the expected dimension.AssertionError
 if assertions are enabled and the envelopes have mismatched CRS. See Also:

intersects
Returnstrue
if this envelope intersects the specified envelope. This method returnstrue
if two envelope interiors have at least one point in common (in other words, their intersection is nonempty). The default implementation delegates to:intersects(envelope, false)
Preconditions
This method assumes that the specified envelope uses the same CRS than this envelope. For performance reasons, it will no be verified unless Java assertions are enabled.Crossing the antimeridian of a Geographic CRS
This method can handle envelopes crossing the antimeridian. Parameters:
envelope
 the envelope to test for intersection. Returns:
true
if this envelope intersects the specified one. Throws:
MismatchedDimensionException
 if the specified envelope doesn't have the expected dimension.AssertionError
 if assertions are enabled and the envelopes have mismatched CRS. Since:
 0.4
 See Also:

intersects
Returnstrue
if this envelope intersects or (optionally) touches the specified envelope. Thetouch
argument controls the value to return if only the envelope boundaries (not the interiors) have a point in common: If
false
, this method returnstrue
if the intersection between the two envelopes is nonempty (i.e. the envelope interiors have points in common). This is the usual definition ofintersects
operation.  If
true
, this method returnstrue
if the two envelopes intersect each other or touch each other.
intersects(Envelope)
, and handles envelopes crossing the antimeridian in the same way. Parameters:
envelope
 the envelope to test for intersection.touch
 the value to return if the two envelopes touch each other. Returns:
true
if this envelope intersects the specified envelope, ortouch
if this envelope touches the specified envelope, orfalse
otherwise. Throws:
MismatchedDimensionException
 if the specified envelope does not have the expected dimension.AssertionError
 if assertions are enabled and the envelopes have mismatched CRS. See Also:
 If

equals
Compares to the specified envelope for equality up to the specified tolerance value. The tolerance valueeps
can be either relative to the envelope span along each dimension or can be an absolute value (as for example some ground resolution of a grid coverage). If
epsIsRelative
is set totrue
, the actual tolerance value for a given dimension i iseps
×span
wherespan
is the maximum of this envelope span and the specified envelope span along dimension i.  If
epsIsRelative
is set tofalse
, the actual tolerance value for a given dimension i iseps
.
Note: Relative tolerance values (as opposed to absolute tolerance values) help to workaround the fact that tolerance value are CRS dependent. For example the tolerance value need to be smaller for geographic CRS than for UTM projections, because the former typically has a [180…180]° range while the later can have a range of thousands of meters.Coordinate Reference System
To be considered equal, the two envelopes must have the same number of dimensions and their CRS must be approximately equal. If at least one envelope has a null CRS, then the CRS are ignored and the coordinate values are compared as if the CRS were equal. Parameters:
other
 the envelope to compare with.eps
 the tolerance value to use for numerical comparisons.epsIsRelative
true
if the tolerance value should be relative to axis length, orfalse
if it is an absolute value. Returns:
true
if the given object is equal to this envelope up to the given tolerance value. See Also:
 If

equals
Returnstrue
if the specified object is an envelope of the same class with equals coordinates and CRS.Implementation note: This implementation requires that the providedobject
argument is of the same class than this envelope. We do not relax this rule since not every implementations in the SIS code base follow the same contract. 
hashCode
public int hashCode()Returns a hash value for this envelope. 
toString
Formats this envelope as a "BOX
" element. The output is of the form "BOX
nD(
lower corner,
upper corner)
" where n is the number of dimensions. The number of dimension is written only if different than 2.Example:BOX(90 180, 90 180)
BOX3D(90 180 0, 90 180 1)
Note: TheThis method formats the numbers as withBOX
element is not part of the standard Well Known Text (WKT) format. However it is understood by many software libraries, for example GDAL and PostGIS.Double.toString(double)
(i.e. without fixed number of fraction digits). The string returned by this method can be parsed by theGeneralEnvelope
constructor. Overrides:
toString
in classFormattableObject
 Returns:
 this envelope as a
BOX
orBOX3D
(most typical dimensions) element.

formatTo
Formats this envelope as a "BOX
" element. The output is of the form "BOX
nD[
lower corner,
upper corner]
" where n is the number of dimensions. The number of dimension is written only if different than 2.Note: TheIf the coordinate reference system is geodetic or projected, then coordinate values are formatted with a precision equivalent to one centimetre on Earth (the actual number of fraction digits is adjusted for the axis unit of measurement and the planet size if different than Earth).BOX
element is not part of the standard Well Known Text (WKT) format. However it is understood by many software libraries, for example GDAL and PostGIS. Specified by:
formatTo
in classFormattableObject
 Parameters:
formatter
 the formatter where to format the inner content of this envelope. Returns:
 the pseudoWKT keyword, which is
"Box"
for this element.  Since:
 1.0
 See Also:
