Package org.apache.pulsar.common.util

Class FieldParser

  • public final class FieldParser
extends java.lang.Object
    Generic value converter.

    Use examples

     String o1 = String.valueOf(1);
 ;
 Integer i = FieldParser.convert(o1, Integer.class);
 System.out.println(i); // 1

    • Constructor Summary

      Constructors 
      Constructor Description
      FieldParser()  

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static java.lang.String booleanToString​(java.lang.Boolean value)
      Converts Boolean to String.
      static <T> T convert​(java.lang.Object from, java.lang.Class<T> to)
      Convert the given object value to the given class.
      static java.lang.String integerToString​(java.lang.Integer value)
      Converts Integer to String.
      static <T> void setEmptyValue​(java.lang.String strValue, java.lang.reflect.Field field, T obj)
      Sets the empty/null value if field is allowed to be set empty.
      static java.lang.Boolean stringToBoolean​(java.lang.String value)
      Converts String to Boolean.
      static java.lang.Double stringToDouble​(java.lang.String val)
      Converts String to Double.
      static java.lang.Float stringToFloat​(java.lang.String val)
      Converts String to float.
      static java.lang.Integer stringToInteger​(java.lang.String val)
      Converts String to Integer.
      static <T> java.util.List<T> stringToList​(java.lang.String val, java.lang.Class<T> type)
      Converts comma separated string to List.
      static java.lang.Long stringToLong​(java.lang.String val)
      Converts String to Long.
      static <T> java.util.Set<T> stringToSet​(java.lang.String val, java.lang.Class<T> type)
      Converts comma separated string to Set.
      static <T> void update​(java.util.Map<java.lang.String,​java.lang.String> properties, T obj)
      Update given Object attribute by reading it from provided map properties.
      static java.lang.Object value​(java.lang.String strValue, java.lang.reflect.Field field)
      Converts value as per appropriate DataType of the field.

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Constructor Detail

      • FieldParser

        public FieldParser()

    • Method Detail

      • convert

        public static <T> T convert​(java.lang.Object from,
                            java.lang.Class<T> to)
        Convert the given object value to the given class.
        Parameters:
        from - The object value to be converted.
        to - The type class which the given object should be converted to.
        Returns:
        The converted object value.
        Throws:
        java.lang.UnsupportedOperationException - If no suitable converter can be found.
        java.lang.RuntimeException - If conversion failed somehow. This can be caused by at least an ExceptionInInitializerError, IllegalAccessException or InvocationTargetException.

      • update

        public static <T> void update​(java.util.Map<java.lang.String,​java.lang.String> properties,
                              T obj)
                       throws java.lang.IllegalArgumentException
        Update given Object attribute by reading it from provided map properties.
        Parameters:
        properties - which key-value pair of properties to assign those values to given object
        obj - object which needs to be updated
        Throws:
        java.lang.IllegalArgumentException - if the properties key-value contains incorrect value type

      • value

        public static java.lang.Object value​(java.lang.String strValue,
                                     java.lang.reflect.Field field)
        Converts value as per appropriate DataType of the field.
        Parameters:
        strValue - : string value of the object
        field - : field of the attribute
        Returns:

      • setEmptyValue

        public static <T> void setEmptyValue​(java.lang.String strValue,
                                     java.lang.reflect.Field field,
                                     T obj)
                              throws java.lang.IllegalArgumentException,
                                     java.lang.IllegalAccessException
        Sets the empty/null value if field is allowed to be set empty.
        Parameters:
        strValue -
        field -
        obj -
        Throws:
        java.lang.IllegalArgumentException
        java.lang.IllegalAccessException

      • stringToInteger

        public static java.lang.Integer stringToInteger​(java.lang.String val)
        Converts String to Integer.
        Parameters:
        val - The String to be converted.
        Returns:
        The converted Integer value.

      • stringToLong

        public static java.lang.Long stringToLong​(java.lang.String val)
        Converts String to Long.
        Parameters:
        val - The String to be converted.
        Returns:
        The converted Long value.

      • stringToDouble

        public static java.lang.Double stringToDouble​(java.lang.String val)
        Converts String to Double.
        Parameters:
        val - The String to be converted.
        Returns:
        The converted Double value.

      • stringToFloat

        public static java.lang.Float stringToFloat​(java.lang.String val)
        Converts String to float.
        Parameters:
        val - The String to be converted.
        Returns:
        The converted Double value.

      • stringToList

        public static <T> java.util.List<T> stringToList​(java.lang.String val,
                                                 java.lang.Class<T> type)
        Converts comma separated string to List.
        Type Parameters:
        T - type of list
        Parameters:
        val - comma separated values.
        Returns:
        The converted list with type <T>.

      • stringToSet

        public static <T> java.util.Set<T> stringToSet​(java.lang.String val,
                                               java.lang.Class<T> type)
        Converts comma separated string to Set.
        Type Parameters:
        T - type of set
        Parameters:
        val - comma separated values.
        Returns:
        The converted set with type <T>.

      • integerToString

        public static java.lang.String integerToString​(java.lang.Integer value)
        Converts Integer to String.
        Parameters:
        value - The Integer to be converted.
        Returns:
        The converted String value.

      • booleanToString

        public static java.lang.String booleanToString​(java.lang.Boolean value)
        Converts Boolean to String.
        Parameters:
        value - The Boolean to be converted.
        Returns:
        The converted String value.

      • stringToBoolean

        public static java.lang.Boolean stringToBoolean​(java.lang.String value)
        Converts String to Boolean.
        Parameters:
        value - The String to be converted.
        Returns:
        The converted Boolean value.