Class FormatParser

  • All Implemented Interfaces:
    Serializable, Cloneable, DataFilter, DataSource, DataTarget
    Direct Known Subclasses:
    DateFormatParser, NumberFormatParser

    public class FormatParser
    extends Object
    implements DataFilter
    A format parser tries to parse a string into an object. If the value returned by the datasource is no string, a string is formed using String.valueOf (Object). This string is fed into the java.text.Format of this FormatParser and the parsed object is returned.

    What class of object is returned, is determined by the given format. If parsing failed, the defined NullValue is returned.

    Thomas Morgner
    See Also:
    Serialized Form
    • Constructor Detail

      • FormatParser

        public FormatParser()
    • Method Detail

      • setFormatter

        public void setFormatter​(Format format)
        Sets the format for the filter.
        format - The format.
        NullPointerException - if the given format is null
      • getFormatter

        public Format getFormatter()
        Returns the format for the filter.
        The format.
      • getValue

        public Object getValue​(ExpressionRuntime runtime,
                               ReportElement element)
        Returns the parsed object. The value is read using the data source given and parsed using the formatter of this object. The parsing is guaranteed to completly form the target object or to return the defined NullValue.

        If the given datasource does not return a string, the returned object is transformed into a string using String.valueOf (Object) and then parsed.

        If format, datasource or object are null, the NullValue is returned.

        Specified by:
        getValue in interface DataSource
        runtime - the expression runtime that is used to evaluate formulas and expressions when computing the value of this filter.
        element -
        The formatted value.
      • isValidOutput

        protected boolean isValidOutput​(Object o)
        Checks whether the given value is already a valid result. IF the datasource already returned a valid value, and no parsing is required, a parser can skip the parsing process by returning true in this function.
        o - the object to parse.
        false as this class does not know anything about the format of input or result objects.
      • getDataSource

        public DataSource getDataSource()
        Returns the data source for the filter.
        Specified by:
        getDataSource in interface DataTarget
        The data source.
      • setDataSource

        public void setDataSource​(DataSource ds)
        Sets the data source.
        Specified by:
        setDataSource in interface DataTarget
        ds - The data source.
      • setNullValue

        public void setNullValue​(Object nullvalue)
        Sets the value that will be displayed if the data source supplies a null value. The nullValue itself can be null to cover the case when no reasonable default value can be defined.
        nullvalue - The value returned when the parsing failed.
      • getNullValue

        public Object getNullValue()
        Returns the object representing a null value from the data source. This value will also be returned when parsing failed or no parser or datasource is set at all.
        The value returned when the parsing failed.