| java.lang.Object
 de.fho.jump.pirol.utilities.FormulaParsing.FormulaParser
| FormulaParser | | public class FormulaParser (Code) | | This class is a utility to parse formulas, that describe how an additional attribute value is to be calculated on a by feature basis.
Formulas thereby can contain constant values as well as attribute values, that need to be extracted for each feature.
Formulas are exspected to be space-separated: Each attribute name, constant value, bracket or operator has to be surrounded by empty spaces.
A valid formulas (for a FeatureSchema that has the attributes "yield" and "grain mois") would look like this:
( 4 + 6 ) * yield
or
grain mois / 2.
author:
Ole Rahn
author:
author:
FH Osnabrück - University of Applied Sciences Osnabrück,
author:
Project: PIROL (2005),
author:
Subproject: Daten- und Wissensmanagement
version:
$Rev: 856 $
See Also: de.fhOsnabrueck.jump.pirol.utilities.FeatureCollectionTools.applyFormulaToFeatureCollection(FeatureCollectionAttributeInfoFormulaValueboolean) |
| findFirstAddSubOperatorOutsideABracket | | protected static int findFirstAddSubOperatorOutsideABracket(String formula, int fromIndex)(Code) | | |
| findFirstMultiDivOperatorOutsideABracket | | protected static int findFirstMultiDivOperatorOutsideABracket(String formula, int fromIndex)(Code) | | |
| findFirstOccuranceOutsideABracket | | protected static int findFirstOccuranceOutsideABracket(String toBeFound, String formula, int fromIndex)(Code) | | |
| getFirstCompleteBracketString | | protected static String getFirstCompleteBracketString(String formula, int fromIndex)(Code) | | |
| getValue | | public static FormulaValue getValue(String formula, FeatureSchema featSchema)(Code) | | Recursively parses a given (sub-) formula into a FormulaValue, which can be an operation with
sub-FormularValues or a value.
Parameters:
formula -
Parameters:
featSchema - The feature schema to check attribute names, if neccessary the given formula parsed into a FormulaValue or null if the given String did not contain formula information |
| isBracket | | protected static boolean isBracket(String brack)(Code) | | |
| isOperator | | protected static boolean isOperator(String op)(Code) | | |
| kickOutSurroundingBracket | | protected static String kickOutSurroundingBracket(String formula)(Code) | | deletes a bracket that surrounds the whole formula from the formula.
Parameters:
formula - formula String formula String without surrounding bracket |
| splitToFirstLevelOperation | | protected static String[] splitToFirstLevelOperation(String formula)(Code) | | |
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