Package org.apache.commons.lang3

Class BooleanUtils

  • public class BooleanUtils
extends java.lang.Object

    Operations on boolean primitives and Boolean objects.

    This class tries to handle null input gracefully. An exception will not be thrown for a null input. Each method documents its behavior in more detail.

    #ThreadSafe#

    Since:
    2.0

    • Field Summary

      Fields 
      Modifier and Type Field Description
      static java.lang.String FALSE
      The false String "false".
      static java.lang.String NO
      The no String "no".
      static java.lang.String OFF
      The off String "off".
      static java.lang.String ON
      The on String "on".
      static java.lang.String TRUE
      The true String "true".
      static java.lang.String YES
      The yes String "yes".

    • Constructor Summary

      Constructors 
      Constructor Description
      BooleanUtils()
      BooleanUtils instances should NOT be constructed in standard programming.

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static boolean and​(boolean... array)
      Performs an 'and' operation on a set of booleans.
      static java.lang.Boolean and​(java.lang.Boolean... array)
      Performs an 'and' operation on an array of Booleans.
      static java.lang.Boolean[] booleanValues()
      Returns a new array of possible values (like an enum would).
      static int compare​(boolean x, boolean y)
      Compares two boolean values.
      static boolean isFalse​(java.lang.Boolean bool)
      Checks if a Boolean value is false, handling null by returning false.
      static boolean isNotFalse​(java.lang.Boolean bool)
      Checks if a Boolean value is not false, handling null by returning true.
      static boolean isNotTrue​(java.lang.Boolean bool)
      Checks if a Boolean value is not true, handling null by returning true.
      static boolean isTrue​(java.lang.Boolean bool)
      Checks if a Boolean value is true, handling null by returning false.
      static java.lang.Boolean negate​(java.lang.Boolean bool)
      Negates the specified boolean.
      static boolean or​(boolean... array)
      Performs an 'or' operation on a set of booleans.
      static java.lang.Boolean or​(java.lang.Boolean... array)
      Performs an 'or' operation on an array of Booleans.
      static boolean[] primitiveValues()
      Returns a new array of possible values (like an enum would).
      static boolean toBoolean​(int value)
      Converts an int to a boolean using the convention that zero is false, everything else is true.
      static boolean toBoolean​(int value, int trueValue, int falseValue)
      Converts an int to a boolean specifying the conversion values.
      static boolean toBoolean​(java.lang.Boolean bool)
      Converts a Boolean to a boolean handling null by returning false.
      static boolean toBoolean​(java.lang.Integer value, java.lang.Integer trueValue, java.lang.Integer falseValue)
      Converts an Integer to a boolean specifying the conversion values.
      static boolean toBoolean​(java.lang.String str)
      Converts a String to a boolean (optimised for performance).
      static boolean toBoolean​(java.lang.String str, java.lang.String trueString, java.lang.String falseString)
      Converts a String to a Boolean throwing an exception if no match found.
      static boolean toBooleanDefaultIfNull​(java.lang.Boolean bool, boolean valueIfNull)
      Converts a Boolean to a boolean handling null.
      static java.lang.Boolean toBooleanObject​(int value)
      Converts an int to a Boolean using the convention that zero is false, everything else is true.
      static java.lang.Boolean toBooleanObject​(int value, int trueValue, int falseValue, int nullValue)
      Converts an int to a Boolean specifying the conversion values.
      static java.lang.Boolean toBooleanObject​(java.lang.Integer value)
      Converts an Integer to a Boolean using the convention that zero is false, every other numeric value is true.
      static java.lang.Boolean toBooleanObject​(java.lang.Integer value, java.lang.Integer trueValue, java.lang.Integer falseValue, java.lang.Integer nullValue)
      Converts an Integer to a Boolean specifying the conversion values.
      static java.lang.Boolean toBooleanObject​(java.lang.String str)
      Converts a String to a Boolean.
      static java.lang.Boolean toBooleanObject​(java.lang.String str, java.lang.String trueString, java.lang.String falseString, java.lang.String nullString)
      Converts a String to a Boolean throwing an exception if no match.
      static int toInteger​(boolean bool)
      Converts a boolean to an int using the convention that true is 1 and false is 0.
      static int toInteger​(boolean bool, int trueValue, int falseValue)
      Converts a boolean to an int specifying the conversion values.
      static int toInteger​(java.lang.Boolean bool, int trueValue, int falseValue, int nullValue)
      Converts a Boolean to an int specifying the conversion values.
      static java.lang.Integer toIntegerObject​(boolean bool)
      Converts a boolean to an Integer using the convention that true is 1 and false is 0.
      static java.lang.Integer toIntegerObject​(boolean bool, java.lang.Integer trueValue, java.lang.Integer falseValue)
      Converts a boolean to an Integer specifying the conversion values.
      static java.lang.Integer toIntegerObject​(java.lang.Boolean bool)
      Converts a Boolean to a Integer using the convention that zero is false.
      static java.lang.Integer toIntegerObject​(java.lang.Boolean bool, java.lang.Integer trueValue, java.lang.Integer falseValue, java.lang.Integer nullValue)
      Converts a Boolean to an Integer specifying the conversion values.
      static java.lang.String toString​(boolean bool, java.lang.String trueString, java.lang.String falseString)
      Converts a boolean to a String returning one of the input Strings.
      static java.lang.String toString​(java.lang.Boolean bool, java.lang.String trueString, java.lang.String falseString, java.lang.String nullString)
      Converts a Boolean to a String returning one of the input Strings.
      static java.lang.String toStringOnOff​(boolean bool)
      Converts a boolean to a String returning 'on' or 'off'.
      static java.lang.String toStringOnOff​(java.lang.Boolean bool)
      Converts a Boolean to a String returning 'on', 'off', or null.
      static java.lang.String toStringTrueFalse​(boolean bool)
      Converts a boolean to a String returning 'true' or 'false'.
      static java.lang.String toStringTrueFalse​(java.lang.Boolean bool)
      Converts a Boolean to a String returning 'true', 'false', or null.
      static java.lang.String toStringYesNo​(boolean bool)
      Converts a boolean to a String returning 'yes' or 'no'.
      static java.lang.String toStringYesNo​(java.lang.Boolean bool)
      Converts a Boolean to a String returning 'yes', 'no', or null.
      static boolean xor​(boolean... array)
      Performs an xor on a set of booleans.
      static java.lang.Boolean xor​(java.lang.Boolean... array)
      Performs an xor on an array of Booleans.

      • Methods inherited from class java.lang.Object

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

    • Field Detail

      • FALSE

        public static final java.lang.String FALSE
        The false String "false".
        Since:
        3.12.0
        See Also:
        Constant Field Values

      • NO

        public static final java.lang.String NO
        The no String "no".
        Since:
        3.12.0
        See Also:
        Constant Field Values

      • OFF

        public static final java.lang.String OFF
        The off String "off".
        Since:
        3.12.0
        See Also:
        Constant Field Values

      • ON

        public static final java.lang.String ON
        The on String "on".
        Since:
        3.12.0
        See Also:
        Constant Field Values

      • TRUE

        public static final java.lang.String TRUE
        The true String "true".
        Since:
        3.12.0
        See Also:
        Constant Field Values

      • YES

        public static final java.lang.String YES
        The yes String "yes".
        Since:
        3.12.0
        See Also:
        Constant Field Values

    • Constructor Detail

      • BooleanUtils

        public BooleanUtils()

        BooleanUtils instances should NOT be constructed in standard programming. Instead, the class should be used as BooleanUtils.negate(true);.

        This constructor is public to permit tools that require a JavaBean instance to operate.

    • Method Detail

      • and

        public static boolean and​(boolean... array)

        Performs an 'and' operation on a set of booleans.

           BooleanUtils.and(true, true)         = true
   BooleanUtils.and(false, false)       = false
   BooleanUtils.and(true, false)        = false
   BooleanUtils.and(true, true, false)  = false
   BooleanUtils.and(true, true, true)   = true
        Parameters:
        array - an array of booleans
        Returns:
        the result of the logical 'and' operation. That is false if any of the parameters is false and true otherwise.
        Throws:
        java.lang.NullPointerException - if array is null
        java.lang.IllegalArgumentException - if array is empty.
        Since:
        3.0.1

      • and

        public static java.lang.Boolean and​(java.lang.Boolean... array)

        Performs an 'and' operation on an array of Booleans.

           BooleanUtils.and(Boolean.TRUE, Boolean.TRUE)                 = Boolean.TRUE
   BooleanUtils.and(Boolean.FALSE, Boolean.FALSE)               = Boolean.FALSE
   BooleanUtils.and(Boolean.TRUE, Boolean.FALSE)                = Boolean.FALSE
   BooleanUtils.and(Boolean.TRUE, Boolean.TRUE, Boolean.TRUE)   = Boolean.TRUE
   BooleanUtils.and(Boolean.FALSE, Boolean.FALSE, Boolean.TRUE) = Boolean.FALSE
   BooleanUtils.and(Boolean.TRUE, Boolean.FALSE, Boolean.TRUE)  = Boolean.FALSE
        Parameters:
        array - an array of Booleans
        Returns:
        the result of the logical 'and' operation. That is false if any of the parameters is false and true otherwise.
        Throws:
        java.lang.NullPointerException - if array is null
        java.lang.IllegalArgumentException - if array is empty.
        java.lang.IllegalArgumentException - if array contains a null
        Since:
        3.0.1

      • booleanValues

        public static java.lang.Boolean[] booleanValues()
        Returns a new array of possible values (like an enum would).
        Returns:
        a new array of possible values (like an enum would).
        Since:
        3.12.0

      • compare

        public static int compare​(boolean x,
                          boolean y)

        Compares two boolean values. This is the same functionality as provided in Java 7.

        Parameters:
        x - the first boolean to compare
        y - the second boolean to compare
        Returns:
        the value 0 if x == y; a value less than 0 if !x && y; and a value greater than 0 if x && !y
        Since:
        3.4

      • isFalse

        public static boolean isFalse​(java.lang.Boolean bool)

        Checks if a Boolean value is false, handling null by returning false.

           BooleanUtils.isFalse(Boolean.TRUE)  = false
   BooleanUtils.isFalse(Boolean.FALSE) = true
   BooleanUtils.isFalse(null)          = false
        Parameters:
        bool - the boolean to check, null returns false
        Returns:
        true only if the input is non-null and false
        Since:
        2.1

      • isNotFalse

        public static boolean isNotFalse​(java.lang.Boolean bool)

        Checks if a Boolean value is not false, handling null by returning true.

           BooleanUtils.isNotFalse(Boolean.TRUE)  = true
   BooleanUtils.isNotFalse(Boolean.FALSE) = false
   BooleanUtils.isNotFalse(null)          = true
        Parameters:
        bool - the boolean to check, null returns true
        Returns:
        true if the input is null or true
        Since:
        2.3

      • isNotTrue

        public static boolean isNotTrue​(java.lang.Boolean bool)

        Checks if a Boolean value is not true, handling null by returning true.

           BooleanUtils.isNotTrue(Boolean.TRUE)  = false
   BooleanUtils.isNotTrue(Boolean.FALSE) = true
   BooleanUtils.isNotTrue(null)          = true
        Parameters:
        bool - the boolean to check, null returns true
        Returns:
        true if the input is null or false
        Since:
        2.3

      • isTrue

        public static boolean isTrue​(java.lang.Boolean bool)

        Checks if a Boolean value is true, handling null by returning false.

           BooleanUtils.isTrue(Boolean.TRUE)  = true
   BooleanUtils.isTrue(Boolean.FALSE) = false
   BooleanUtils.isTrue(null)          = false
        Parameters:
        bool - the boolean to check, null returns false
        Returns:
        true only if the input is non-null and true
        Since:
        2.1

      • negate

        public static java.lang.Boolean negate​(java.lang.Boolean bool)

        Negates the specified boolean.

        If null is passed in, null will be returned.

        NOTE: This returns null and will throw a NullPointerException if unboxed to a boolean. 

           BooleanUtils.negate(Boolean.TRUE)  = Boolean.FALSE;
   BooleanUtils.negate(Boolean.FALSE) = Boolean.TRUE;
   BooleanUtils.negate(null)          = null;
        Parameters:
        bool - the Boolean to negate, may be null
        Returns:
        the negated Boolean, or null if null input

      • or

        public static boolean or​(boolean... array)

        Performs an 'or' operation on a set of booleans.

           BooleanUtils.or(true, true)          = true
   BooleanUtils.or(false, false)        = false
   BooleanUtils.or(true, false)         = true
   BooleanUtils.or(true, true, false)   = true
   BooleanUtils.or(true, true, true)    = true
   BooleanUtils.or(false, false, false) = false
        Parameters:
        array - an array of booleans
        Returns:
        true if any of the arguments is true, and it returns false otherwise.
        Throws:
        java.lang.NullPointerException - if array is null
        java.lang.IllegalArgumentException - if array is empty.
        Since:
        3.0.1

      • or

        public static java.lang.Boolean or​(java.lang.Boolean... array)

        Performs an 'or' operation on an array of Booleans.

           BooleanUtils.or(Boolean.TRUE, Boolean.TRUE)                  = Boolean.TRUE
   BooleanUtils.or(Boolean.FALSE, Boolean.FALSE)                = Boolean.FALSE
   BooleanUtils.or(Boolean.TRUE, Boolean.FALSE)                 = Boolean.TRUE
   BooleanUtils.or(Boolean.TRUE, Boolean.TRUE, Boolean.TRUE)    = Boolean.TRUE
   BooleanUtils.or(Boolean.FALSE, Boolean.FALSE, Boolean.TRUE)  = Boolean.TRUE
   BooleanUtils.or(Boolean.TRUE, Boolean.FALSE, Boolean.TRUE)   = Boolean.TRUE
   BooleanUtils.or(Boolean.FALSE, Boolean.FALSE, Boolean.FALSE) = Boolean.FALSE
        Parameters:
        array - an array of Booleans
        Returns:
        true if any of the arguments is true, and it returns false otherwise.
        Throws:
        java.lang.NullPointerException - if array is null
        java.lang.IllegalArgumentException - if array is empty.
        java.lang.IllegalArgumentException - if array contains a null
        Since:
        3.0.1

      • primitiveValues

        public static boolean[] primitiveValues()
        Returns a new array of possible values (like an enum would).
        Returns:
        a new array of possible values (like an enum would).
        Since:
        3.12.0

      • toBoolean

        public static boolean toBoolean​(java.lang.Boolean bool)

        Converts a Boolean to a boolean handling null by returning false.

           BooleanUtils.toBoolean(Boolean.TRUE)  = true
   BooleanUtils.toBoolean(Boolean.FALSE) = false
   BooleanUtils.toBoolean(null)          = false
        Parameters:
        bool - the boolean to convert
        Returns:
        true or false, null returns false

      • toBoolean

        public static boolean toBoolean​(int value)

        Converts an int to a boolean using the convention that zero is false, everything else is true.

           BooleanUtils.toBoolean(0) = false
   BooleanUtils.toBoolean(1) = true
   BooleanUtils.toBoolean(2) = true
        Parameters:
        value - the int to convert
        Returns:
        true if non-zero, false if zero

      • toBoolean

        public static boolean toBoolean​(int value,
                                int trueValue,
                                int falseValue)

        Converts an int to a boolean specifying the conversion values.

        If the trueValue and falseValue are the same number then the return value will be true in case value matches it.

           BooleanUtils.toBoolean(0, 1, 0) = false
   BooleanUtils.toBoolean(1, 1, 0) = true
   BooleanUtils.toBoolean(1, 1, 1) = true
   BooleanUtils.toBoolean(2, 1, 2) = false
   BooleanUtils.toBoolean(2, 2, 0) = true
        Parameters:
        value - the Integer to convert
        trueValue - the value to match for true
        falseValue - the value to match for false
        Returns:
        true or false
        Throws:
        java.lang.IllegalArgumentException - if value does not match neither trueValue no falseValue

      • toBoolean

        public static boolean toBoolean​(java.lang.Integer value,
                                java.lang.Integer trueValue,
                                java.lang.Integer falseValue)

        Converts an Integer to a boolean specifying the conversion values.

           BooleanUtils.toBoolean(Integer.valueOf(0), Integer.valueOf(1), Integer.valueOf(0)) = false
   BooleanUtils.toBoolean(Integer.valueOf(1), Integer.valueOf(1), Integer.valueOf(0)) = true
   BooleanUtils.toBoolean(Integer.valueOf(2), Integer.valueOf(1), Integer.valueOf(2)) = false
   BooleanUtils.toBoolean(Integer.valueOf(2), Integer.valueOf(2), Integer.valueOf(0)) = true
   BooleanUtils.toBoolean(null, null, Integer.valueOf(0))                     = true
        Parameters:
        value - the Integer to convert
        trueValue - the value to match for true, may be null
        falseValue - the value to match for false, may be null
        Returns:
        true or false
        Throws:
        java.lang.IllegalArgumentException - if no match

      • toBoolean

        public static boolean toBoolean​(java.lang.String str)

        Converts a String to a boolean (optimised for performance).

        'true', 'on', 'y', 't' or 'yes' (case insensitive) will return true. Otherwise, false is returned.

        This method performs 4 times faster (JDK1.4) than Boolean.valueOf(String). However, this method accepts 'on' and 'yes', 't', 'y' as true values. 

           BooleanUtils.toBoolean(null)    = false
   BooleanUtils.toBoolean("true")  = true
   BooleanUtils.toBoolean("TRUE")  = true
   BooleanUtils.toBoolean("tRUe")  = true
   BooleanUtils.toBoolean("on")    = true
   BooleanUtils.toBoolean("yes")   = true
   BooleanUtils.toBoolean("false") = false
   BooleanUtils.toBoolean("x gti") = false
   BooleanUtils.toBoolean("y") = true
   BooleanUtils.toBoolean("n") = false
   BooleanUtils.toBoolean("t") = true
   BooleanUtils.toBoolean("f") = false
        Parameters:
        str - the String to check
        Returns:
        the boolean value of the string, false if no match or the String is null

      • toBoolean

        public static boolean toBoolean​(java.lang.String str,
                                java.lang.String trueString,
                                java.lang.String falseString)

        Converts a String to a Boolean throwing an exception if no match found.

           BooleanUtils.toBoolean("true", "true", "false")  = true
   BooleanUtils.toBoolean("false", "true", "false") = false
        Parameters:
        str - the String to check
        trueString - the String to match for true (case sensitive), may be null
        falseString - the String to match for false (case sensitive), may be null
        Returns:
        the boolean value of the string
        Throws:
        java.lang.IllegalArgumentException - if the String doesn't match

      • toBooleanDefaultIfNull

        public static boolean toBooleanDefaultIfNull​(java.lang.Boolean bool,
                                             boolean valueIfNull)

        Converts a Boolean to a boolean handling null.

           BooleanUtils.toBooleanDefaultIfNull(Boolean.TRUE, false)  = true
   BooleanUtils.toBooleanDefaultIfNull(Boolean.TRUE, true)   = true
   BooleanUtils.toBooleanDefaultIfNull(Boolean.FALSE, true)  = false
   BooleanUtils.toBooleanDefaultIfNull(Boolean.FALSE, false) = false
   BooleanUtils.toBooleanDefaultIfNull(null, true)           = true
   BooleanUtils.toBooleanDefaultIfNull(null, false)          = false
        Parameters:
        bool - the boolean object to convert to primitive
        valueIfNull - the boolean value to return if the parameter bool is null
        Returns:
        true or false

      • toBooleanObject

        public static java.lang.Boolean toBooleanObject​(int value)

        Converts an int to a Boolean using the convention that zero is false, everything else is true.

           BooleanUtils.toBoolean(0) = Boolean.FALSE
   BooleanUtils.toBoolean(1) = Boolean.TRUE
   BooleanUtils.toBoolean(2) = Boolean.TRUE
        Parameters:
        value - the int to convert
        Returns:
        Boolean.TRUE if non-zero, Boolean.FALSE if zero, null if null

      • toBooleanObject

        public static java.lang.Boolean toBooleanObject​(int value,
                                                int trueValue,
                                                int falseValue,
                                                int nullValue)

        Converts an int to a Boolean specifying the conversion values.

        NOTE: This method may return null and may throw a NullPointerException if unboxed to a boolean.

        The checks are done first for the trueValue, then for the falseValue and finally for the nullValue.

           BooleanUtils.toBooleanObject(0, 0, 2, 3) = Boolean.TRUE
   BooleanUtils.toBooleanObject(0, 0, 0, 3) = Boolean.TRUE
   BooleanUtils.toBooleanObject(0, 0, 0, 0) = Boolean.TRUE
   BooleanUtils.toBooleanObject(2, 1, 2, 3) = Boolean.FALSE
   BooleanUtils.toBooleanObject(2, 1, 2, 2) = Boolean.FALSE
   BooleanUtils.toBooleanObject(3, 1, 2, 3) = null
        Parameters:
        value - the Integer to convert
        trueValue - the value to match for true
        falseValue - the value to match for false
        nullValue - the value to to match for null
        Returns:
        Boolean.TRUE, Boolean.FALSE, or null
        Throws:
        java.lang.IllegalArgumentException - if no match

      • toBooleanObject

        public static java.lang.Boolean toBooleanObject​(java.lang.Integer value)

        Converts an Integer to a Boolean using the convention that zero is false, every other numeric value is true.

        null will be converted to null.

        NOTE: This method may return null and may throw a NullPointerException if unboxed to a boolean.

           BooleanUtils.toBooleanObject(Integer.valueOf(0))    = Boolean.FALSE
   BooleanUtils.toBooleanObject(Integer.valueOf(1))    = Boolean.TRUE
   BooleanUtils.toBooleanObject(Integer.valueOf(null)) = null
        Parameters:
        value - the Integer to convert
        Returns:
        Boolean.TRUE if non-zero, Boolean.FALSE if zero, null if null input

      • toBooleanObject

        public static java.lang.Boolean toBooleanObject​(java.lang.Integer value,
                                                java.lang.Integer trueValue,
                                                java.lang.Integer falseValue,
                                                java.lang.Integer nullValue)

        Converts an Integer to a Boolean specifying the conversion values.

        NOTE: This method may return null and may throw a NullPointerException if unboxed to a boolean.

        The checks are done first for the trueValue, then for the falseValue and finally for the nullValue.

           BooleanUtils.toBooleanObject(Integer.valueOf(0), Integer.valueOf(0), Integer.valueOf(2), Integer.valueOf(3)) = Boolean.TRUE
   BooleanUtils.toBooleanObject(Integer.valueOf(0), Integer.valueOf(0), Integer.valueOf(0), Integer.valueOf(3)) = Boolean.TRUE
   BooleanUtils.toBooleanObject(Integer.valueOf(0), Integer.valueOf(0), Integer.valueOf(0), Integer.valueOf(0)) = Boolean.TRUE
   BooleanUtils.toBooleanObject(Integer.valueOf(2), Integer.valueOf(1), Integer.valueOf(2), Integer.valueOf(3)) = Boolean.FALSE
   BooleanUtils.toBooleanObject(Integer.valueOf(2), Integer.valueOf(1), Integer.valueOf(2), Integer.valueOf(2)) = Boolean.FALSE
   BooleanUtils.toBooleanObject(Integer.valueOf(3), Integer.valueOf(1), Integer.valueOf(2), Integer.valueOf(3)) = null
        Parameters:
        value - the Integer to convert
        trueValue - the value to match for true, may be null
        falseValue - the value to match for false, may be null
        nullValue - the value to to match for null, may be null
        Returns:
        Boolean.TRUE, Boolean.FALSE, or null
        Throws:
        java.lang.IllegalArgumentException - if no match

      • toBooleanObject

        public static java.lang.Boolean toBooleanObject​(java.lang.String str)

        Converts a String to a Boolean.

        'true', 'on', 'y', 't', 'yes' or '1' (case insensitive) will return true. 'false', 'off', 'n', 'f', 'no' or '0' (case insensitive) will return false. Otherwise, null is returned.

        NOTE: This method may return null and may throw a NullPointerException if unboxed to a boolean.

           // N.B. case is not significant
   BooleanUtils.toBooleanObject(null)    = null
   BooleanUtils.toBooleanObject("true")  = Boolean.TRUE
   BooleanUtils.toBooleanObject("T")     = Boolean.TRUE // i.e. T[RUE]
   BooleanUtils.toBooleanObject("false") = Boolean.FALSE
   BooleanUtils.toBooleanObject("f")     = Boolean.FALSE // i.e. f[alse]
   BooleanUtils.toBooleanObject("No")    = Boolean.FALSE
   BooleanUtils.toBooleanObject("n")     = Boolean.FALSE // i.e. n[o]
   BooleanUtils.toBooleanObject("on")    = Boolean.TRUE
   BooleanUtils.toBooleanObject("ON")    = Boolean.TRUE
   BooleanUtils.toBooleanObject("off")   = Boolean.FALSE
   BooleanUtils.toBooleanObject("oFf")   = Boolean.FALSE
   BooleanUtils.toBooleanObject("yes")   = Boolean.TRUE
   BooleanUtils.toBooleanObject("Y")     = Boolean.TRUE // i.e. Y[ES]
   BooleanUtils.toBooleanObject("1")     = Boolean.TRUE
   BooleanUtils.toBooleanObject("0")     = Boolean.FALSE
   BooleanUtils.toBooleanObject("blue")  = null
   BooleanUtils.toBooleanObject("true ") = null // trailing space (too long)
   BooleanUtils.toBooleanObject("ono")   = null // does not match on or no
        Parameters:
        str - the String to check; upper and lower case are treated as the same
        Returns:
        the Boolean value of the string, null if no match or null input

      • toBooleanObject

        public static java.lang.Boolean toBooleanObject​(java.lang.String str,
                                                java.lang.String trueString,
                                                java.lang.String falseString,
                                                java.lang.String nullString)

        Converts a String to a Boolean throwing an exception if no match.

        NOTE: This method may return null and may throw a NullPointerException if unboxed to a boolean.

           BooleanUtils.toBooleanObject("true", "true", "false", "null")   = Boolean.TRUE
   BooleanUtils.toBooleanObject(null, null, "false", "null")       = Boolean.TRUE
   BooleanUtils.toBooleanObject(null, null, null, "null")          = Boolean.TRUE
   BooleanUtils.toBooleanObject(null, null, null, null)            = Boolean.TRUE
   BooleanUtils.toBooleanObject("false", "true", "false", "null")  = Boolean.FALSE
   BooleanUtils.toBooleanObject("false", "true", "false", "false") = Boolean.FALSE
   BooleanUtils.toBooleanObject(null, "true", null, "false")       = Boolean.FALSE
   BooleanUtils.toBooleanObject(null, "true", null, null)          = Boolean.FALSE
   BooleanUtils.toBooleanObject("null", "true", "false", "null")   = null
        Parameters:
        str - the String to check
        trueString - the String to match for true (case sensitive), may be null
        falseString - the String to match for false (case sensitive), may be null
        nullString - the String to match for null (case sensitive), may be null
        Returns:
        the Boolean value of the string, null if either the String matches nullString or if null input and nullString is null
        Throws:
        java.lang.IllegalArgumentException - if the String doesn't match

      • toInteger

        public static int toInteger​(boolean bool)

        Converts a boolean to an int using the convention that true is 1 and false is 0.

           BooleanUtils.toInteger(true)  = 1
   BooleanUtils.toInteger(false) = 0
        Parameters:
        bool - the boolean to convert
        Returns:
        one if true, zero if false

      • toInteger

        public static int toInteger​(boolean bool,
                            int trueValue,
                            int falseValue)

        Converts a boolean to an int specifying the conversion values.

           BooleanUtils.toInteger(true, 1, 0)  = 1
   BooleanUtils.toInteger(false, 1, 0) = 0
        Parameters:
        bool - the to convert
        trueValue - the value to return if true
        falseValue - the value to return if false
        Returns:
        the appropriate value

      • toInteger

        public static int toInteger​(java.lang.Boolean bool,
                            int trueValue,
                            int falseValue,
                            int nullValue)

        Converts a Boolean to an int specifying the conversion values.

           BooleanUtils.toInteger(Boolean.TRUE, 1, 0, 2)  = 1
   BooleanUtils.toInteger(Boolean.FALSE, 1, 0, 2) = 0
   BooleanUtils.toInteger(null, 1, 0, 2)          = 2
        Parameters:
        bool - the Boolean to convert
        trueValue - the value to return if true
        falseValue - the value to return if false
        nullValue - the value to return if null
        Returns:
        the appropriate value

      • toIntegerObject

        public static java.lang.Integer toIntegerObject​(boolean bool)

        Converts a boolean to an Integer using the convention that true is 1 and false is 0.

           BooleanUtils.toIntegerObject(true)  = Integer.valueOf(1)
   BooleanUtils.toIntegerObject(false) = Integer.valueOf(0)
        Parameters:
        bool - the boolean to convert
        Returns:
        one if true, zero if false

      • toIntegerObject

        public static java.lang.Integer toIntegerObject​(boolean bool,
                                                java.lang.Integer trueValue,
                                                java.lang.Integer falseValue)

        Converts a boolean to an Integer specifying the conversion values.

           BooleanUtils.toIntegerObject(true, Integer.valueOf(1), Integer.valueOf(0))  = Integer.valueOf(1)
   BooleanUtils.toIntegerObject(false, Integer.valueOf(1), Integer.valueOf(0)) = Integer.valueOf(0)
        Parameters:
        bool - the to convert
        trueValue - the value to return if true, may be null
        falseValue - the value to return if false, may be null
        Returns:
        the appropriate value

      • toIntegerObject

        public static java.lang.Integer toIntegerObject​(java.lang.Boolean bool)

        Converts a Boolean to a Integer using the convention that zero is false.

        null will be converted to null.

           BooleanUtils.toIntegerObject(Boolean.TRUE)  = Integer.valueOf(1)
   BooleanUtils.toIntegerObject(Boolean.FALSE) = Integer.valueOf(0)
        Parameters:
        bool - the Boolean to convert
        Returns:
        one if Boolean.TRUE, zero if Boolean.FALSE, null if null

      • toIntegerObject

        public static java.lang.Integer toIntegerObject​(java.lang.Boolean bool,
                                                java.lang.Integer trueValue,
                                                java.lang.Integer falseValue,
                                                java.lang.Integer nullValue)

        Converts a Boolean to an Integer specifying the conversion values.

           BooleanUtils.toIntegerObject(Boolean.TRUE, Integer.valueOf(1), Integer.valueOf(0), Integer.valueOf(2))  = Integer.valueOf(1)
   BooleanUtils.toIntegerObject(Boolean.FALSE, Integer.valueOf(1), Integer.valueOf(0), Integer.valueOf(2)) = Integer.valueOf(0)
   BooleanUtils.toIntegerObject(null, Integer.valueOf(1), Integer.valueOf(0), Integer.valueOf(2))          = Integer.valueOf(2)
        Parameters:
        bool - the Boolean to convert
        trueValue - the value to return if true, may be null
        falseValue - the value to return if false, may be null
        nullValue - the value to return if null, may be null
        Returns:
        the appropriate value

      • toString

        public static java.lang.String toString​(boolean bool,
                                        java.lang.String trueString,
                                        java.lang.String falseString)

        Converts a boolean to a String returning one of the input Strings.

           BooleanUtils.toString(true, "true", "false")   = "true"
   BooleanUtils.toString(false, "true", "false")  = "false"
        Parameters:
        bool - the Boolean to check
        trueString - the String to return if true, may be null
        falseString - the String to return if false, may be null
        Returns:
        one of the two input Strings

      • toString

        public static java.lang.String toString​(java.lang.Boolean bool,
                                        java.lang.String trueString,
                                        java.lang.String falseString,
                                        java.lang.String nullString)

        Converts a Boolean to a String returning one of the input Strings.

           BooleanUtils.toString(Boolean.TRUE, "true", "false", null)   = "true"
   BooleanUtils.toString(Boolean.FALSE, "true", "false", null)  = "false"
   BooleanUtils.toString(null, "true", "false", null)           = null;
        Parameters:
        bool - the Boolean to check
        trueString - the String to return if true, may be null
        falseString - the String to return if false, may be null
        nullString - the String to return if null, may be null
        Returns:
        one of the three input Strings

      • toStringOnOff

        public static java.lang.String toStringOnOff​(boolean bool)

        Converts a boolean to a String returning 'on' or 'off'.

           BooleanUtils.toStringOnOff(true)   = "on"
   BooleanUtils.toStringOnOff(false)  = "off"
        Parameters:
        bool - the Boolean to check
        Returns:
        'on', 'off', or null

      • toStringOnOff

        public static java.lang.String toStringOnOff​(java.lang.Boolean bool)

        Converts a Boolean to a String returning 'on', 'off', or null.

           BooleanUtils.toStringOnOff(Boolean.TRUE)  = "on"
   BooleanUtils.toStringOnOff(Boolean.FALSE) = "off"
   BooleanUtils.toStringOnOff(null)          = null;
        Parameters:
        bool - the Boolean to check
        Returns:
        'on', 'off', or null

      • toStringTrueFalse

        public static java.lang.String toStringTrueFalse​(boolean bool)

        Converts a boolean to a String returning 'true' or 'false'.

           BooleanUtils.toStringTrueFalse(true)   = "true"
   BooleanUtils.toStringTrueFalse(false)  = "false"
        Parameters:
        bool - the Boolean to check
        Returns:
        'true', 'false', or null

      • toStringTrueFalse

        public static java.lang.String toStringTrueFalse​(java.lang.Boolean bool)

        Converts a Boolean to a String returning 'true', 'false', or null.

           BooleanUtils.toStringTrueFalse(Boolean.TRUE)  = "true"
   BooleanUtils.toStringTrueFalse(Boolean.FALSE) = "false"
   BooleanUtils.toStringTrueFalse(null)          = null;
        Parameters:
        bool - the Boolean to check
        Returns:
        'true', 'false', or null

      • toStringYesNo

        public static java.lang.String toStringYesNo​(boolean bool)

        Converts a boolean to a String returning 'yes' or 'no'.

           BooleanUtils.toStringYesNo(true)   = "yes"
   BooleanUtils.toStringYesNo(false)  = "no"
        Parameters:
        bool - the Boolean to check
        Returns:
        'yes', 'no', or null

      • toStringYesNo

        public static java.lang.String toStringYesNo​(java.lang.Boolean bool)

        Converts a Boolean to a String returning 'yes', 'no', or null.

           BooleanUtils.toStringYesNo(Boolean.TRUE)  = "yes"
   BooleanUtils.toStringYesNo(Boolean.FALSE) = "no"
   BooleanUtils.toStringYesNo(null)          = null;
        Parameters:
        bool - the Boolean to check
        Returns:
        'yes', 'no', or null

      • xor

        public static boolean xor​(boolean... array)

        Performs an xor on a set of booleans.

           BooleanUtils.xor(true, true)   = false
   BooleanUtils.xor(false, false) = false
   BooleanUtils.xor(true, false)  = true
        Parameters:
        array - an array of booleans
        Returns:
        the result of the xor operations
        Throws:
        java.lang.NullPointerException - if array is null
        java.lang.IllegalArgumentException - if array is empty.

      • xor

        public static java.lang.Boolean xor​(java.lang.Boolean... array)

        Performs an xor on an array of Booleans.

           BooleanUtils.xor(new Boolean[] { Boolean.TRUE, Boolean.TRUE })   = Boolean.FALSE
   BooleanUtils.xor(new Boolean[] { Boolean.FALSE, Boolean.FALSE }) = Boolean.FALSE
   BooleanUtils.xor(new Boolean[] { Boolean.TRUE, Boolean.FALSE })  = Boolean.TRUE
   BooleanUtils.xor(Boolean.TRUE, Boolean.FALSE, Boolean.FALSE)     = Boolean.TRUE
        Parameters:
        array - an array of Booleans
        Returns:
        the result of the xor operations
        Throws:
        java.lang.NullPointerException - if array is null
        java.lang.IllegalArgumentException - if array is empty.
        java.lang.IllegalArgumentException - if array contains a null