Package org.apache.commons.validator.routines

Class DoubleValidator

java.lang.Object
org.apache.commons.validator.routines.AbstractFormatValidator
org.apache.commons.validator.routines.AbstractNumberValidator
org.apache.commons.validator.routines.DoubleValidator
All Implemented Interfaces:
Serializable
public class DoubleValidator extends AbstractNumberValidator

Double Validation and Conversion routines (java.lang.Double).

This validator provides a number of methods for validating/converting a String value to a Double using java.text.NumberFormat to parse either:

  • using the default format for the default Locale
  • using a specified pattern with the default Locale
  • using the default format for a specified Locale
  • using a specified pattern with a specified Locale

Use one of the isValid() methods to just validate or one of the validate() methods to validate and receive a converted Double value.

Once a value has been successfully converted the following methods can be used to perform minimum, maximum and range checks:

  • minValue() checks whether the value is greater than or equal to a specified minimum.
  • maxValue() checks whether the value is less than or equal to a specified maximum.
  • isInRange() checks whether the value is within a specified range of values.

So that the same mechanism used for parsing an input value for validation can be used to format output, corresponding format() methods are also provided. That is you can format either:

  • using the default format for the default Locale
  • using a specified pattern with the default Locale
  • using the default format for a specified Locale
  • using a specified pattern with a specified Locale
Since:
1.3.0
See Also:

  • Constructor Details

    • DoubleValidator

      public DoubleValidator()
      Constructs a strict instance.

    • DoubleValidator

      public DoubleValidator(boolean strict, int formatType)

      Construct an instance with the specified strict setting and format type.

      The formatType specified what type of NumberFormat is created - valid types are:

      • AbstractNumberValidator.STANDARD_FORMAT -to create standard number formats (the default).
      • AbstractNumberValidator.CURRENCY_FORMAT -to create currency number formats.
      • AbstractNumberValidator.PERCENT_FORMAT -to create percent number formats (the default).
      Parameters:
      strict - true if strict Format parsing should be used.
      formatType - The NumberFormat type to create for validation, default is STANDARD_FORMAT.

  • Method Details

    • getInstance

      public static DoubleValidator getInstance()
      Return a singleton instance of this validator.
      Returns:
      A singleton instance of the DoubleValidator.

    • isInRange

      public boolean isInRange(double value, double min, double max)
      Check if the value is within a specified range.
      Parameters:
      value - The Number value to check.
      min - The minimum value of the range.
      max - The maximum value of the range.
      Returns:
      true if the value is within the specified range.

    • isInRange

      public boolean isInRange(Double value, double min, double max)
      Check if the value is within a specified range.
      Parameters:
      value - The Number value to check.
      min - The minimum value of the range.
      max - The maximum value of the range.
      Returns:
      true if the value is within the specified range.

    • maxValue

      public boolean maxValue(double value, double max)
      Check if the value is less than or equal to a maximum.
      Parameters:
      value - The value validation is being performed on.
      max - The maximum value.
      Returns:
      true if the value is less than or equal to the maximum.

    • maxValue

      public boolean maxValue(Double value, double max)
      Check if the value is less than or equal to a maximum.
      Parameters:
      value - The value validation is being performed on.
      max - The maximum value.
      Returns:
      true if the value is less than or equal to the maximum.

    • minValue

      public boolean minValue(double value, double min)
      Check if the value is greater than or equal to a minimum.
      Parameters:
      value - The value validation is being performed on.
      min - The minimum value.
      Returns:
      true if the value is greater than or equal to the minimum.

    • minValue

      public boolean minValue(Double value, double min)
      Check if the value is greater than or equal to a minimum.
      Parameters:
      value - The value validation is being performed on.
      min - The minimum value.
      Returns:
      true if the value is greater than or equal to the minimum.

    • processParsedValue

      protected Object processParsedValue(Object value, Format formatter)
      Convert the parsed value to a Double.
      Specified by:
      processParsedValue in class AbstractNumberValidator
      Parameters:
      value - The parsed Number object created.
      formatter - The Format used to parse the value with.
      Returns:
      The validated/converted Double value if valid or null if invalid.

    • validate

      public Double validate(String value)

      Validate/convert a Double using the default Locale.

      Parameters:
      value - The value validation is being performed on.
      Returns:
      The parsed Double if valid or null if invalid.

    • validate

      public Double validate(String value, Locale locale)

      Validate/convert a Double using the specified Locale.

      Parameters:
      value - The value validation is being performed on.
      locale - The locale to use for the number format, system default if null.
      Returns:
      The parsed Double if valid or null if invalid.

    • validate

      public Double validate(String value, String pattern)

      Validate/convert a Double using the specified pattern.

      Parameters:
      value - The value validation is being performed on.
      pattern - The pattern used to validate the value against.
      Returns:
      The parsed BigDecimal if valid or null if invalid.

    • validate

      public Double validate(String value, String pattern, Locale locale)

      Validate/convert a Double using the specified pattern and/ or Locale.

      Parameters:
      value - The value validation is being performed on.
      pattern - The pattern used to validate the value against, or the default for the Locale if null.
      locale - The locale to use for the date format, system default if null.
      Returns:
      The parsed Double if valid or null if invalid.