Package org.apache.sis.io.wkt

Class Formatter

    • Constructor Detail

      • Formatter

        public Formatter()
        Creates a new formatter instance with the default configuration.

      • Formatter

        public Formatter​(Convention convention,
                 Symbols symbols,
                 int indentation)
        Creates a new formatter instance with the specified convention, symbols and indentation.
        Parameters:
        convention - the convention to use.
        symbols - the symbols.
        indentation - the amount of spaces to use in indentation for WKT formatting, or WKTFormat​.SINGLE_LINE for formatting the whole WKT on a single line.

    • Method Detail

      • getTransliterator

        public final Transliterator getTransliterator()
        Returns a mapper between Java character sequences and the characters to write in WKT. The intent is to specify how to write characters that are not allowed in WKT strings according ISO 19162 specification. Return values can be:
        Returns:
        the mapper between Java character sequences and the characters to write in WKT.
        Since:
        0.6
        See Also:
        WKTFormat​.set­Transliterator(Transliterator)

      • getLocale

        public final Locale getLocale()
        Returns the locale to use for localizing International­String instances. This is not the locale for formatting dates and numbers.
        Specified by:
        get­Locale in interface Localized
        Returns:
        the locale to use for localizing international strings.

      • newLine

        public void newLine()
        Request a line separator before the next element to format. Invoking this method before any append(…) method call will cause the next element to appear on the next line.

        This method has no effect in any of the following cases:

      • indent

        public void indent​(int amount)
        Increases or decreases the indentation. A value of +1 increases the indentation by the amount of spaces specified at construction time, and a value of -1 reduces it by the same amount.
        Parameters:
        amount - +1 for increasing the indentation, or -1 for decreasing it, or 0 for no-op.

      • append

        public void append​(GeographicBoundingBox bbox,
                   int fractionDigits)
        Appends the given geographic bounding box in a BBOX[…] element. Longitude and latitude values will be formatted in decimal degrees. Longitudes are relative to the Greenwich meridian, with values increasing toward East. Latitudes values are increasing toward North.
        Numerical precision
        The ISO 19162 standards recommends to format those values with only 2 decimal digits. This is because Geographic­Bounding­Box does not specify the datum, so this box is an approximated information only.
        Parameters:
        bbox - the geographic bounding box to append to the WKT, or null.
        fraction­Digits - the number of fraction digits to use. The recommended value is 2.

      • append

        public void append​(MathTransform transform)
        Appends the given math transform, typically (but not necessarily) in a PARAM_MT[…] element.
        Parameters:
        transform - the transform object to append to the WKT, or null if none.

      • append

        public void append​(String text,
                   ElementKind type)
        Appends a character string between quotes. The element separator will be written before the text if needed.
        Parameters:
        text - the string to format to the WKT, or null if none.
        type - the key of the colors to apply if syntax coloring is enabled, or null if none.

      • append

        public void append​(CodeList<?> code)
        Appends an enumeration or code list value. The element separator will be written before the code list if needed.

        For the WKT 2 format, this method uses the ISO name if available (for example "north­East"). For the WKT 1 format, this method uses the programmatic name instead (for example "NORTH_EAST").

        Parameters:
        code - the code list to append to the WKT, or null if none.

      • append

        public void append​(Date date)
        Appends a date. The element separator will be written before the date if needed.
        Parameters:
        date - the date to append to the WKT, or null if none.

      • append

        public void append​(boolean value)
        Appends a boolean value. The element separator will be written before the boolean if needed.
        Parameters:
        value - the boolean to append to the WKT.

      • append

        public void append​(long number)
        Appends an integer value. The element separator will be written before the number if needed.
        Parameters:
        number - the integer to append to the WKT.

      • append

        public void append​(double number)
        Appends an floating point value. The element separator will be written before the number if needed.
        Parameters:
        number - the floating point value to append to the WKT.

      • append

        public void append​(Vector[] rows,
                   int... fractionDigits)
        Appends rows of numbers. Each number is separated by a space, and each row is separated by a comma. Rows usually have all the same length, but this is not mandatory. This method can be used for formatting geometries or matrix.
        Parameters:
        rows - the rows to append, or null if none.
        fraction­Digits - the number of fraction digits for each column in a row, or null for default. A precision can be specified for each column because those columns are often different dimensions of a Coordinate Reference System (CRS), each with their own units of measurement. If a row contains more numbers than fraction­Digits​.length, then the last value in this array is repeated for all remaining row numbers.
        Since:
        1.0

      • append

        public void append​(Unit<?> unit)
        Appends a unit in a Unit[…] element or one of the specialized elements. Specialized elements are Angle­Unit, Length­Unit, Scale­Unit, Parametric­Unit and Time­Unit. By default, specialized unit keywords are used with the WKT 2 convention.
        Example: append(Units​.KILOMETRE) will append "Length­Unit["km", 1000]" to the WKT.
        Parameters:
        unit - the unit to append to the WKT, or null if none.
        See Also:
        WKT 2 specification §7.4

      • appendAny

        public void appendAny​(Object value)
        Appends an object or an array of objects. This method performs the following choices:
        • If the given value is null, then this method appends the "null" string (without quotes).
        • Otherwise if the given value is an array, then this method appends the opening sequence symbol, formats all elements by invoking this method recursively, then appends the closing sequence symbol.
        • Otherwise if the value type is assignable to the argument type of one of the append(…) methods in this class, then the formatting will be delegated to that method.
        • Otherwise the given value is appended as a quoted text with its to­String() representation.
        Parameters:
        value - the value to append to the WKT, or null.

      • getEnclosingElement

        public FormattableObject getEnclosingElement​(int depth)
        Returns the enclosing WKT element, or null if element being formatted is the root. This method can be invoked by child elements having some aspects that depend on the enclosing element.
        Parameters:
        depth - 1 for the immediate parent, 2 for the parent of the parent, etc.
        Returns:
        the parent element at the given depth, or null.

      • hasContextualUnit

        public boolean hasContextualUnit​(int depth)
        Returns true if the element at the given depth specified a contextual unit. This method returns true if the formattable object given by get­Enclosing­Element(depth) has invoked add­Contextual­Unit(Unit) with a non-null unit at least once.
        Note: The main purpose of this method is to allow AXIS[…] elements to determine if they should inherit the unit specified by the enclosing CRS, or if they should specify their unit explicitly.
        Parameters:
        depth - 1 for the immediate parent, 2 for the parent of the parent, etc.
        Returns:
        whether the parent element at the given depth has invoked add­Contextual­Unit(…) at least once.

      • addContextualUnit

        public <Q extends Quantity<Q>> Unit<Q> addContextualUnit​(Unit<Q> unit)
        Adds a unit to use for the next measurements of the quantity Q. The given unit will apply to all WKT elements containing a value of quantity Q without their own UNIT[…] element, until the restore­Contextual­Unit(Unit, Unit) method is invoked.

        If the given unit is null, then this method does nothing and returns null.

        Special case
        If the WKT conventions are WKT1_COMMON_UNITS, then this method ignores the given unit and returns null. See Convention​.WKT1_COMMON_UNITS javadoc for more information.
        Type Parameters:
        Q - the unit quantity.
        Parameters:
        unit - the contextual unit to add, or null if none.
        Returns:
        the previous contextual unit for quantity Q, or null if none.

      • restoreContextualUnit

        public void restoreContextualUnit​(Unit<?> unit,
                                  Unit<?> previous)
        Restores the contextual unit to its previous state before the call to add­Contextual­Unit(Unit). This method is used in the following pattern: 
        final Unit<?> previous = formatter.addContextualUnit(unit);
// ... format some WKT elements here.
formatter.restoreContextualUnit(unit, previous);
        Parameters:
        unit - the value given in argument to add­Contextual­Unit(unit) (can be null).
        previous - the value returned by add­Contextual­Unit(unit) (can be null).
        Throws:
        Illegal­State­Exception - if this method has not been invoked in the pattern documented above.
        Since:
        0.6

      • toContextualUnit

        public <Q extends Quantity<Q>> Unit<Q> toContextualUnit​(Unit<Q> unit)
        Returns the unit to use instead than the given one, or unit if there is no replacement. This method searches for a unit specified by add­Contextual­Unit(Unit) which is compatible with the given unit.
        Type Parameters:
        Q - the quantity of the unit.
        Parameters:
        unit - the unit to replace by the contextual unit, or null.
        Returns:
        a contextual unit compatible with the given unit, or unit (which may be null) if no contextual unit has been found.

      • isInvalidWKT

        public boolean isInvalidWKT()
        Returns true if the WKT written by this formatter is not strictly compliant to the WKT specification. This method returns true if set­Invalid­WKT(Identified­Object, Exception) has been invoked at least once. The action to take regarding invalid WKT is caller-dependent. For example Formattable­Object​.to­String() will accepts loose WKT formatting and ignore this flag, while Formattable­Object​.to­WKT() requires strict WKT formatting and will thrown an exception if this flag is set.
        Returns:
        true if the WKT is invalid.

      • setInvalidWKT

        public void setInvalidWKT​(IdentifiedObject unformattable,
                          Exception cause)
        Marks the current WKT representation of the given object as not strictly compliant with the WKT specification. This method can be invoked by implementations of Formattable­Object​.format­To(Formatter) when the object to format is more complex than what the WKT specification allows. Applications can test is­Invalid­WKT() later for checking WKT validity.
        Parameters:
        unformattable - the object that can not be formatted,
        cause - the cause for the failure to format, or null if the cause is not an exception.

      • setInvalidWKT

        public void setInvalidWKT​(Class<?> unformattable,
                          Exception cause)
        Marks the current WKT representation of the given class as not strictly compliant with the WKT specification. This method can be used as an alternative to set­Invalid­WKT(Identified­Object, Exception) when the problematic object is not an instance of Identified­Object.
        Parameters:
        unformattable - the class of the object that can not be formatted,
        cause - the cause for the failure to format, or null if the cause is not an exception.

      • toWKT

        public String toWKT()
        Returns the WKT formatted by this object.
        Returns:
        the WKT formatted by this formatter.

      • toString

        public String toString()
        Returns a string representation of this formatter for debugging purpose.
        Overrides:
        to­String in class Object
        Returns:
        a string representation of this formatter.