net.hasor.utils

类 BooleanUtils

java.lang.Object

net.hasor.utils.BooleanUtils

public class BooleanUtils
extends 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 behaviour in more detail.

#ThreadSafe#

从以下版本开始:

2.0

版本:

$Id: BooleanUtils.java 1057037 2011-01-09 21:35:32Z niallp $

作者:

Apache Software Foundation, Matthew Hawthorne, Gary Gregory

构造器概要

构造器

构造器和说明
BooleanUtils() BooleanUtils instances should NOT be constructed in standard programming.

方法概要

限定符和类型	方法和说明
static boolean	isBooleanType(Class targetType)
static boolean	isFalse(Boolean bool) Checks if a Boolean value is false, handling null by returning false.
static boolean	isNotFalse(Boolean bool) Checks if a Boolean value is not false, handling null by returning true.
static boolean	isNotTrue(Boolean bool) Checks if a Boolean value is not true, handling null by returning true.
static boolean	isTrue(Boolean bool) Checks if a Boolean value is true, handling null by returning false.
static Boolean	negate(Boolean bool) Negates the specified boolean.
static boolean	toBoolean(Boolean bool) Converts a Boolean to a boolean handling null by returning false.
static boolean	toBoolean(int value) Converts an int to a boolean using the convention that zero is false.
static boolean	toBoolean(Integer value, Integer trueValue, Integer falseValue) Converts an Integer to a boolean specifying the conversion values.
static boolean	toBoolean(int value, int trueValue, int falseValue) Converts an int to a boolean specifying the conversion values.
static boolean	toBoolean(String str) Converts a String to a boolean (optimised for performance).
static boolean	toBoolean(String str, String trueString, String falseString) Converts a String to a Boolean throwing an exception if no match found.
static boolean	toBooleanDefaultIfNull(Boolean bool, boolean valueIfNull) Converts a Boolean to a boolean handling null.
static Boolean	toBooleanObject(boolean bool) Boolean factory that avoids creating new Boolean objecs all the time.
static Boolean	toBooleanObject(int value) Converts an int to a Boolean using the convention that zero is false.
static Boolean	toBooleanObject(Integer value) Converts an Integer to a Boolean using the convention that zero is false.
static Boolean	toBooleanObject(Integer value, Integer trueValue, Integer falseValue, Integer nullValue) Converts an Integer to a Boolean specifying the conversion values.
static Boolean	toBooleanObject(int value, int trueValue, int falseValue, int nullValue) Converts an int to a Boolean specifying the conversion values.
static Boolean	toBooleanObject(String str) Converts a String to a Boolean.
static Boolean	toBooleanObject(String str, String trueString, String falseString, 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 zero is false.
static int	toInteger(boolean bool, int trueValue, int falseValue) Converts a boolean to an int specifying the conversion values.
static int	toInteger(Boolean bool, int trueValue, int falseValue, int nullValue) Converts a Boolean to an int specifying the conversion values.
static Integer	toIntegerObject(boolean bool, Integer trueValue, Integer falseValue) Converts a boolean to an Integer specifying the conversion values.
static Integer	toIntegerObject(Boolean bool, Integer trueValue, Integer falseValue, Integer nullValue) Converts a Boolean to an Integer specifying the conversion values.
static String	toString(boolean bool, String trueString, String falseString) Converts a boolean to a String returning one of the input Strings.
static String	toString(Boolean bool, String trueString, String falseString, String nullString) Converts a Boolean to a String returning one of the input Strings.
static String	toStringOnOff(boolean bool) Converts a boolean to a String returning 'on' or 'off'.
static String	toStringOnOff(Boolean bool) Converts a Boolean to a String returning 'on', 'off', or null.
static String	toStringTrueFalse(boolean bool) Converts a boolean to a String returning 'true' or 'false'.
static String	toStringTrueFalse(Boolean bool) Converts a Boolean to a String returning 'true', 'false', or null.
static String	toStringYesNo(boolean bool) Converts a boolean to a String returning 'yes' or 'no'.
static String	toStringYesNo(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 Boolean	xor(Boolean[] array) Performs an xor on an array of Booleans.

从类继承的方法 java.lang.Object

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

构造器详细资料

BooleanUtils

public BooleanUtils()

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

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

方法详细资料

negate

public static Boolean negate(Boolean bool)

Negates the specified boolean.

If null is passed in, null will be returned.

   BooleanUtils.negate(Boolean.TRUE)  = Boolean.FALSE;
   BooleanUtils.negate(Boolean.FALSE) = Boolean.TRUE;
   BooleanUtils.negate(null)          = null;
 

参数:

bool - the Boolean to negate, may be null

返回:

the negated Boolean, or null if null input

isTrue

public static boolean isTrue(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
 

参数:

bool - the boolean to check, null returns false

返回:

true only if the input is non-null and true

从以下版本开始:

2.1

isNotTrue

public static boolean isNotTrue(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
 

参数:

bool - the boolean to check, null returns true

返回:

true if the input is null or false

从以下版本开始:

2.3

isFalse

public static boolean isFalse(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
 

参数:

bool - the boolean to check, null returns false

返回:

true only if the input is non-null and false

从以下版本开始:

2.1

isNotFalse

public static boolean isNotFalse(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
 

参数:

bool - the boolean to check, null returns true

返回:

true if the input is null or true

从以下版本开始:

2.3

toBooleanObject

public static Boolean toBooleanObject(boolean bool)

Boolean factory that avoids creating new Boolean objecs all the time.

This method was added to JDK1.4 but is available here for earlier JDKs.

   BooleanUtils.toBooleanObject(false) = Boolean.FALSE
   BooleanUtils.toBooleanObject(true)  = Boolean.TRUE
 

参数:

bool - the boolean to convert

返回:

Boolean.TRUE or Boolean.FALSE as appropriate

toBoolean

public static boolean toBoolean(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
 

参数:

bool - the boolean to convert

返回:

true or false, null returns false

toBooleanDefaultIfNull

public static boolean toBooleanDefaultIfNull(Boolean bool,
                                             boolean valueIfNull)

Converts a Boolean to a boolean handling null.

   BooleanUtils.toBooleanDefaultIfNull(Boolean.TRUE, false) = true
   BooleanUtils.toBooleanDefaultIfNull(Boolean.FALSE, true) = false
   BooleanUtils.toBooleanDefaultIfNull(null, true)          = true
 

参数:

bool - the boolean to convert

valueIfNull - the boolean value to return if null

返回:

true or false

toBoolean

public static boolean toBoolean(int value)

Converts an int to a boolean using the convention that zero is false.

   BooleanUtils.toBoolean(0) = false
   BooleanUtils.toBoolean(1) = true
   BooleanUtils.toBoolean(2) = true
 

参数:

value - the int to convert

返回:

true if non-zero, false if zero

toBooleanObject

public static Boolean toBooleanObject(int value)

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

   BooleanUtils.toBoolean(0) = Boolean.FALSE
   BooleanUtils.toBoolean(1) = Boolean.TRUE
   BooleanUtils.toBoolean(2) = Boolean.TRUE
 

参数:

value - the int to convert

返回:

Boolean.TRUE if non-zero, Boolean.FALSE if zero, null if null

toBooleanObject

public static Boolean toBooleanObject(Integer value)

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

null will be converted to null.

   BooleanUtils.toBoolean(new Integer(0))    = Boolean.FALSE
   BooleanUtils.toBoolean(new Integer(1))    = Boolean.TRUE
   BooleanUtils.toBoolean(new Integer(null)) = null
 

参数:

value - the Integer to convert

返回:

Boolean.TRUE if non-zero, Boolean.FALSE if zero, null if null input

toBoolean

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

Converts an int to a boolean specifying the conversion values.

   BooleanUtils.toBoolean(0, 1, 0) = false
   BooleanUtils.toBoolean(1, 1, 0) = true
   BooleanUtils.toBoolean(2, 1, 2) = false
   BooleanUtils.toBoolean(2, 2, 0) = true
 

参数:

value - the Integer to convert

trueValue - the value to match for true

falseValue - the value to match for false

返回:

true or false

抛出:

IllegalArgumentException - if no match

toBoolean

public static boolean toBoolean(Integer value,
                                Integer trueValue,
                                Integer falseValue)

Converts an Integer to a boolean specifying the conversion values.

   BooleanUtils.toBoolean(new Integer(0), new Integer(1), new Integer(0)) = false
   BooleanUtils.toBoolean(new Integer(1), new Integer(1), new Integer(0)) = true
   BooleanUtils.toBoolean(new Integer(2), new Integer(1), new Integer(2)) = false
   BooleanUtils.toBoolean(new Integer(2), new Integer(2), new Integer(0)) = true
   BooleanUtils.toBoolean(null, null, new Integer(0))                     = true
 

参数:

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

返回:

true or false

抛出:

IllegalArgumentException - if no match

toBooleanObject

public static Boolean toBooleanObject(int value,
                                      int trueValue,
                                      int falseValue,
                                      int nullValue)

Converts an int to a Boolean specifying the conversion values.

   BooleanUtils.toBooleanObject(0, 0, 2, 3) = Boolean.TRUE
   BooleanUtils.toBooleanObject(2, 1, 2, 3) = Boolean.FALSE
   BooleanUtils.toBooleanObject(3, 1, 2, 3) = null
 

参数:

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

返回:

Boolean.TRUE, Boolean.FALSE, or null

抛出:

IllegalArgumentException - if no match

toBooleanObject

public static Boolean toBooleanObject(Integer value,
                                      Integer trueValue,
                                      Integer falseValue,
                                      Integer nullValue)

Converts an Integer to a Boolean specifying the conversion values.

   BooleanUtils.toBooleanObject(new Integer(0), new Integer(0), new Integer(2), new Integer(3)) = Boolean.TRUE
   BooleanUtils.toBooleanObject(new Integer(2), new Integer(1), new Integer(2), new Integer(3)) = Boolean.FALSE
   BooleanUtils.toBooleanObject(new Integer(3), new Integer(1), new Integer(2), new Integer(3)) = null
 

参数:

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

返回:

Boolean.TRUE, Boolean.FALSE, or null

抛出:

IllegalArgumentException - if no match

toInteger

public static int toInteger(boolean bool)

Converts a boolean to an int using the convention that zero is false.

   BooleanUtils.toInteger(true)  = 1
   BooleanUtils.toInteger(false) = 0
 

参数:

bool - the boolean to convert

返回:

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
 

参数:

bool - the to convert

trueValue - the value to return if true

falseValue - the value to return if false

返回:

the appropriate value

toInteger

public static int toInteger(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
 

参数:

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

返回:

the appropriate value

toIntegerObject

public static Integer toIntegerObject(boolean bool,
                                      Integer trueValue,
                                      Integer falseValue)

Converts a boolean to an Integer specifying the conversion values.

   BooleanUtils.toIntegerObject(true, new Integer(1), new Integer(0))  = new Integer(1)
   BooleanUtils.toIntegerObject(false, new Integer(1), new Integer(0)) = new Integer(0)
 

参数:

bool - the to convert

trueValue - the value to return if true, may be null

falseValue - the value to return if false, may be null

返回:

the appropriate value

toIntegerObject

public static Integer toIntegerObject(Boolean bool,
                                      Integer trueValue,
                                      Integer falseValue,
                                      Integer nullValue)

Converts a Boolean to an Integer specifying the conversion values.

   BooleanUtils.toIntegerObject(Boolean.TRUE, new Integer(1), new Integer(0), new Integer(2))  = new Integer(1)
   BooleanUtils.toIntegerObject(Boolean.FALSE, new Integer(1), new Integer(0), new Integer(2)) = new Integer(0)
   BooleanUtils.toIntegerObject(null, new Integer(1), new Integer(0), new Integer(2))          = new Integer(2)
 

参数:

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

返回:

the appropriate value

toBooleanObject

public static Boolean toBooleanObject(String str)

Converts a String to a Boolean.

'true', 'on' or 'yes' (case insensitive) will return true. 'false', 'off' or 'no' (case insensitive) will return false. Otherwise, null is returned.

   BooleanUtils.toBooleanObject(null)    = null
   BooleanUtils.toBooleanObject("true")  = Boolean.TRUE
   BooleanUtils.toBooleanObject("false") = Boolean.FALSE
   BooleanUtils.toBooleanObject("on")    = Boolean.TRUE
   BooleanUtils.toBooleanObject("ON")    = Boolean.TRUE
   BooleanUtils.toBooleanObject("off")   = Boolean.FALSE
   BooleanUtils.toBooleanObject("oFf")   = Boolean.FALSE
   BooleanUtils.toBooleanObject("blue")  = null
 

参数:

str - the String to check

返回:

the Boolean value of the string, null if no match or null input

toBooleanObject

public static Boolean toBooleanObject(String str,
                                      String trueString,
                                      String falseString,
                                      String nullString)

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

   BooleanUtils.toBooleanObject("true", "true", "false", "null")  = Boolean.TRUE
   BooleanUtils.toBooleanObject("false", "true", "false", "null") = Boolean.FALSE
   BooleanUtils.toBooleanObject("null", "true", "false", "null")  = null
 

参数:

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

返回:

the Boolean value of the string, null if either the String matches nullString or if null input and nullString is null

抛出:

IllegalArgumentException - if the String doesn't match

toBoolean

public static boolean toBoolean(String str)

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

'true', 'on' 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' 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
 

参数:

str - the String to check

返回:

the boolean value of the string, false if no match or the String is null

toBoolean

public static boolean toBoolean(String str,
                                String trueString,
                                String falseString)

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

null is returned if there is no match.

   BooleanUtils.toBoolean("true", "true", "false")  = true
   BooleanUtils.toBoolean("false", "true", "false") = false
 

参数:

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

返回:

the boolean value of the string

抛出:

IllegalArgumentException - if the String doesn't match

toStringTrueFalse

public static String toStringTrueFalse(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;
 

参数:

bool - the Boolean to check

返回:

'true', 'false', or null

toStringOnOff

public static String toStringOnOff(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;
 

参数:

bool - the Boolean to check

返回:

'on', 'off', or null

toStringYesNo

public static String toStringYesNo(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;
 

参数:

bool - the Boolean to check

返回:

'yes', 'no', or null

toString

public static String toString(Boolean bool,
                              String trueString,
                              String falseString,
                              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;
 

参数:

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

返回:

one of the three input Strings

toStringTrueFalse

public static String toStringTrueFalse(boolean bool)

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

   BooleanUtils.toStringTrueFalse(true)   = "true"
   BooleanUtils.toStringTrueFalse(false)  = "false"
 

参数:

bool - the Boolean to check

返回:

'true', 'false', or null

toStringOnOff

public static String toStringOnOff(boolean bool)

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

   BooleanUtils.toStringOnOff(true)   = "on"
   BooleanUtils.toStringOnOff(false)  = "off"
 

参数:

bool - the Boolean to check

返回:

'on', 'off', or null

toStringYesNo

public static String toStringYesNo(boolean bool)

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

   BooleanUtils.toStringYesNo(true)   = "yes"
   BooleanUtils.toStringYesNo(false)  = "no"
 

参数:

bool - the Boolean to check

返回:

'yes', 'no', or null

toString

public static String toString(boolean bool,
                              String trueString,
                              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"
 

参数:

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

返回:

one of the two input Strings

xor

public static boolean xor(boolean[] array)

Performs an xor on a set of booleans.

   BooleanUtils.xor(new boolean[] { true, true })   = false
   BooleanUtils.xor(new boolean[] { false, false }) = false
   BooleanUtils.xor(new boolean[] { true, false })  = true
 

参数:

array - an array of booleans

返回:

true if the xor is successful.

抛出:

IllegalArgumentException - if array is null

IllegalArgumentException - if array is empty.

xor

public static Boolean xor(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
 

参数:

array - an array of Booleans

返回:

true if the xor is successful.

抛出:

IllegalArgumentException - if array is null

IllegalArgumentException - if array is empty.

IllegalArgumentException - if array contains a null

isBooleanType

public static boolean isBooleanType(Class targetType)