Package adams.flow.source

Class MathExpression

  • All Implemented Interfaces:
    AdditionalInformationHandler, CleanUpHandler, Destroyable, GlobalInfoSupporter, LoggingLevelHandler, LoggingSupporter, OptionHandler, QuickInfoSupporter, ShallowCopySupporter<Actor>, SizeOfHandler, Stoppable, StoppableWithFeedback, VariablesInspectionHandler, VariableChangeListener, Actor, ErrorHandler, OutputProducer, GrammarSupplier, Serializable, Comparable
    public class MathExpression
extends AbstractSimpleSource
implements GrammarSupplier
    Evaluates a mathematical expression.
    Variables are supported as well, e.g.: pow(X,@{exp}) with '@{exp}' being a variable available at execution time.

    The following grammar is used for the expressions:

    expr_list ::= '=' expr_list expr_part | expr_part ;
    expr_part ::= expr ;

    expr ::= ( expr )

    # data types
    | number
    | string
    | boolean
    | date

    # constants
    | true
    | false
    | pi
    | e
    | now()
    | today()

    # negating numeric value
    | -expr

    # comparisons
    | expr < expr
    | expr <= expr
    | expr > expr
    | expr >= expr
    | expr = expr
    | expr != expr (or: expr <> expr)

    # boolean operations
    | ! expr (or: not expr)
    | expr & expr (or: expr and expr)
    | expr | expr (or: expr or expr)
    | if[else] ( expr , expr (if true) , expr (if false) )
    | ifmissing ( variable , expr (default value if variable is missing) )
    | isNaN ( expr )

    # arithmetics
    | expr + expr
    | expr - expr
    | expr * expr
    | expr / expr
    | expr ^ expr (power of)
    | expr % expr (modulo)
    ;

    # numeric functions
    | abs ( expr )
    | sqrt ( expr )
    | cbrt ( expr )
    | log ( expr )
    | log10 ( expr )
    | exp ( expr )
    | sin ( expr )
    | sinh ( expr )
    | cos ( expr )
    | cosh ( expr )
    | tan ( expr )
    | tanh ( expr )
    | atan ( expr )
    | atan2 ( exprY , exprX )
    | hypot ( exprX , exprY )
    | signum ( expr )
    | rint ( expr )
    | floor ( expr )
    | pow[er] ( expr , expr )
    | ceil ( expr )
    | min ( expr1 , expr2 )
    | max ( expr1 , expr2 )
    | year ( expr )
    | month ( expr )
    | day ( expr )
    | hour ( expr )
    | minute ( expr )
    | second ( expr )
    | weekday ( expr )
    | weeknum ( expr )

    # string functions
    | substr ( expr , start [, end] )
    | left ( expr , len )
    | mid ( expr , start , len )
    | right ( expr , len )
    | rept ( expr , count )
    | concatenate ( expr1 , expr2 [, expr3-5] )
    | lower[case] ( expr )
    | upper[case] ( expr )
    | trim ( expr )
    | matches ( expr , regexp )
    | trim ( expr )
    | len[gth] ( str )
    | find ( search , expr [, pos] )
    | replace ( str , pos , len , newstr )
    | substitute ( str , find , replace [, occurrences] )
    ;

    Notes:
    - Variables are either all upper case letters (e.g., "ABC") or any character apart from "]" enclosed by "[" and "]" (e.g., "[Hello World]").
    - 'start' and 'end' for function 'substr' are indices that start at 1.
    - Index 'end' for function 'substr' is excluded (like Java's 'String.substring(int,int)' method)
    - Line comments start with '#'.
    - Semi-colons (';') or commas (',') can be used as separator in the formulas,
    e.g., 'pow(2,2)' is equivalent to 'pow(2;2)'
    - dates have to be of format 'yyyy-MM-dd' or 'yyyy-MM-dd HH:mm:ss'
    - times have to be of format 'HH:mm:ss' or 'yyyy-MM-dd HH:mm:ss'
    - the characters in square brackets in function names are optional:
    e.g. 'len("abc")' is the same as 'length("abc")'

    A lot of the functions have been modeled after LibreOffice:
    https://help.libreoffice.org/Calc/Functions_by_Category

    Additional functions:
    - env(String): String
       First argument is the name of the environment variable to retrieve.
       The result is the value of the environment variable.

    Additional procedures:
    - println(...)
       One or more arguments are printed as comma-separated list to stdout.
       If no argument is provided, a simple line feed is output.


    Input/output:
    - generates:
       java.lang.Double


    -logging-level <OFF|SEVERE|WARNING|INFO|CONFIG|FINE|FINER|FINEST> (property: loggingLevel)
    The logging level for outputting errors and debugging output.
    default: WARNING
 
    -name <java.lang.String> (property: name)
    The name of the actor.
    default: MathExpression
 
    -annotation <adams.core.base.BaseAnnotation> (property: annotations)
    The annotations to attach to this actor.
    default: 
 
    -skip <boolean> (property: skip)
    If set to true, transformation is skipped and the input token is just forwarded 
    as it is.
    default: false
 
    -stop-flow-on-error <boolean> (property: stopFlowOnError)
    If set to true, the flow gets stopped in case this actor encounters an error;
     useful for critical actors.
    default: false
 
    -silent <boolean> (property: silent)
    If enabled, then no errors are output in the console.
    default: false
 
    -expression <adams.parser.MathematicalExpressionText> (property: expression)
    The mathematical expression to evaluate.
    default: 1.0
 
    -round-output <boolean> (property: roundOutput)
    If enabled, the output of the expression is rounding with the specified 
    type of rounding.
    default: false
 
    -rounding-type <ROUND|CEILING|FLOOR> (property: roundingType)
    The rounding type to perform on the doubles passing through.
    default: ROUND
    Version:
    $Revision$
    Author:
    fracpete (fracpete at waikato dot ac dot nz)
    See Also:
    MathematicalExpression, Serialized Form

    • Field Detail

      • m_RoundOutput

        protected boolean m_RoundOutput
        whether to round the output of the expression.

      • m_RoundingType

        protected RoundingType m_RoundingType
        the rounding type to perform.

      • m_NumDecimals

        protected int m_NumDecimals
        the number of decimals.

    • Constructor Detail

      • MathExpression

        public MathExpression()

    • Method Detail

      • getGrammar

        public String getGrammar()
        Returns a string representation of the grammar.
        Specified by:
        getGrammar in interface GrammarSupplier
        Returns:
        the grammar, null if not available

      • setExpression

        public void setExpression​(MathematicalExpressionText value)
        Sets the mathematical expression to evaluate.
        Parameters:
        value - the expression

      • getExpression

        public MathematicalExpressionText getExpression()
        Returns the mathematical expression to evaluate.
        Returns:
        the expression

      • expressionTipText

        public String expressionTipText()
        Returns the tip text for this property.
        Returns:
        tip text for this property suitable for displaying in the GUI or for listing the options.

      • setRoundOutput

        public void setRoundOutput​(boolean value)
        Sets whether to round the output of the expression.
        Parameters:
        value - if true then round output

      • getRoundOutput

        public boolean getRoundOutput()
        Returns whether to round the output of the expression.
        Returns:
        true if to round output

      • roundOutputTipText

        public String roundOutputTipText()
        Returns the tip text for this property.
        Returns:
        tip text for this property suitable for displaying in the GUI or for listing the options.

      • setRoundingType

        public void setRoundingType​(RoundingType value)
        Sets the roundingType to perform on the doubles.
        Parameters:
        value - the roundingType

      • getRoundingType

        public RoundingType getRoundingType()
        Returns the roundingType to perform on the doubles.
        Returns:
        the roundingType

      • roundingTypeTipText

        public String roundingTypeTipText()
        Returns the tip text for this property.
        Returns:
        tip text for this property suitable for displaying in the GUI or for listing the options.

      • setNumDecimals

        public void setNumDecimals​(int value)
        Sets the number of decimals after the decimal point to use.
        Parameters:
        value - the number of decimals

      • getNumDecimals

        public int getNumDecimals()
        Returns the number of decimals after the decimal point to use.
        Returns:
        the number of decimals

      • numDecimalsTipText

        public String numDecimalsTipText()
        Returns the tip text for this property.
        Returns:
        tip text for this property suitable for displaying in the GUI or for listing the options.

      • generates

        public Class[] generates()
        Returns the class of objects that it generates.
        Specified by:
        generates in interface OutputProducer
        Returns:
        java.lang.Double.class

      • applyRounding

        protected Double applyRounding​(double value)
        Applies rounding if necessary.
        Parameters:
        value - the value to round
        Returns:
        the potentially modified value
        See Also:
        getRoundOutput()

      • doExecute

        protected String doExecute()
        Executes the flow item.
        Specified by:
        doExecute in class AbstractActor
        Returns:
        null if everything is fine, otherwise error message