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Apache Commons Lang, a package of Java utility classes for the
classes that are in java.lang's hierarchy, or are considered to be so
standard as to justify existence in java.lang.
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.lang3;
import org.apache.commons.lang3.math.NumberUtils;
/**
* Operations on boolean primitives and Boolean objects.
*
* This class tries to handle {@code null} input gracefully.
* An exception will not be thrown for a {@code null} input.
* Each method documents its behaviour in more detail.
*
* #ThreadSafe#
* @since 2.0
* @version $Id: BooleanUtils.java 1133336 2011-06-08 10:51:27Z scolebourne $
*/
public class BooleanUtils {
/**
* {@code BooleanUtils} instances should NOT be constructed in standard programming.
* Instead, the class should be used as {@code BooleanUtils.negate(true);}.
*
* This constructor is public to permit tools that require a JavaBean instance
* to operate.
*/
public BooleanUtils() {
super();
}
// Boolean utilities
//--------------------------------------------------------------------------
/**
* Negates the specified boolean.
*
* If {@code null} is passed in, {@code null} will be returned.
*
* NOTE: This returns null and will throw a NullPointerException if autoboxed to a boolean.
*
*
* BooleanUtils.negate(Boolean.TRUE) = Boolean.FALSE;
* BooleanUtils.negate(Boolean.FALSE) = Boolean.TRUE;
* BooleanUtils.negate(null) = null;
*
*
* @param bool the Boolean to negate, may be null
* @return the negated Boolean, or {@code null} if {@code null} input
*/
public static Boolean negate(Boolean bool) {
if (bool == null) {
return null;
}
return bool.booleanValue() ? Boolean.FALSE : Boolean.TRUE;
}
// boolean Boolean methods
//-----------------------------------------------------------------------
/**
* Checks if a {@code Boolean} value is {@code true},
* handling {@code null} by returning {@code false}.
*
*
* BooleanUtils.isTrue(Boolean.TRUE) = true
* BooleanUtils.isTrue(Boolean.FALSE) = false
* BooleanUtils.isTrue(null) = false
*
*
* @param bool the boolean to check, null returns {@code false}
* @return {@code true} only if the input is non-null and true
* @since 2.1
*/
public static boolean isTrue(Boolean bool) {
return Boolean.TRUE.equals(bool);
}
/**
* Checks if a {@code Boolean} value is not {@code true},
* handling {@code null} by returning {@code true}.
*
*
* BooleanUtils.isNotTrue(Boolean.TRUE) = false
* BooleanUtils.isNotTrue(Boolean.FALSE) = true
* BooleanUtils.isNotTrue(null) = true
*
*
* @param bool the boolean to check, null returns {@code true}
* @return {@code true} if the input is null or false
* @since 2.3
*/
public static boolean isNotTrue(Boolean bool) {
return !isTrue(bool);
}
/**
* Checks if a {@code Boolean} value is {@code false},
* handling {@code null} by returning {@code false}.
*
*
* BooleanUtils.isFalse(Boolean.TRUE) = false
* BooleanUtils.isFalse(Boolean.FALSE) = true
* BooleanUtils.isFalse(null) = false
*
*
* @param bool the boolean to check, null returns {@code false}
* @return {@code true} only if the input is non-null and false
* @since 2.1
*/
public static boolean isFalse(Boolean bool) {
return Boolean.FALSE.equals(bool);
}
/**
* Checks if a {@code Boolean} value is not {@code false},
* handling {@code null} by returning {@code true}.
*
*
* BooleanUtils.isNotFalse(Boolean.TRUE) = true
* BooleanUtils.isNotFalse(Boolean.FALSE) = false
* BooleanUtils.isNotFalse(null) = true
*
*
* @param bool the boolean to check, null returns {@code true}
* @return {@code true} if the input is null or true
* @since 2.3
*/
public static boolean isNotFalse(Boolean bool) {
return !isFalse(bool);
}
//-----------------------------------------------------------------------
/**
* Converts a Boolean to a boolean handling {@code null}
* by returning {@code false}.
*
*
* BooleanUtils.toBoolean(Boolean.TRUE) = true
* BooleanUtils.toBoolean(Boolean.FALSE) = false
* BooleanUtils.toBoolean(null) = false
*
*
* @param bool the boolean to convert
* @return {@code true} or {@code false}, {@code null} returns {@code false}
*/
public static boolean toBoolean(Boolean bool) {
return bool != null && bool.booleanValue();
}
/**
* Converts a Boolean to a boolean handling {@code null}.
*
*
* BooleanUtils.toBooleanDefaultIfNull(Boolean.TRUE, false) = true
* BooleanUtils.toBooleanDefaultIfNull(Boolean.FALSE, true) = false
* BooleanUtils.toBooleanDefaultIfNull(null, true) = true
*
*
* @param bool the boolean to convert
* @param valueIfNull the boolean value to return if {@code null}
* @return {@code true} or {@code false}
*/
public static boolean toBooleanDefaultIfNull(Boolean bool, boolean valueIfNull) {
if (bool == null) {
return valueIfNull;
}
return bool.booleanValue();
}
// Integer to Boolean methods
//-----------------------------------------------------------------------
/**
* Converts an int to a boolean using the convention that {@code zero}
* is {@code false}.
*
*
* BooleanUtils.toBoolean(0) = false
* BooleanUtils.toBoolean(1) = true
* BooleanUtils.toBoolean(2) = true
*
*
* @param value the int to convert
* @return {@code true} if non-zero, {@code false}
* if zero
*/
public static boolean toBoolean(int value) {
return value != 0;
}
/**
* Converts an int to a Boolean using the convention that {@code zero}
* is {@code false}.
*
*
* BooleanUtils.toBoolean(0) = Boolean.FALSE
* BooleanUtils.toBoolean(1) = Boolean.TRUE
* BooleanUtils.toBoolean(2) = Boolean.TRUE
*
*
* @param value the int to convert
* @return Boolean.TRUE if non-zero, Boolean.FALSE if zero,
* {@code null} if {@code null}
*/
public static Boolean toBooleanObject(int value) {
return value == 0 ? Boolean.FALSE : Boolean.TRUE;
}
/**
* Converts an Integer to a Boolean using the convention that {@code zero}
* is {@code false}.
*
* {@code null} will be converted to {@code null}.
*
* NOTE: This returns null and will throw a NullPointerException if autoboxed to a boolean.
*
*
* BooleanUtils.toBoolean(new Integer(0)) = Boolean.FALSE
* BooleanUtils.toBoolean(new Integer(1)) = Boolean.TRUE
* BooleanUtils.toBoolean(new Integer(null)) = null
*
*
* @param value the Integer to convert
* @return Boolean.TRUE if non-zero, Boolean.FALSE if zero,
* {@code null} if {@code null} input
*/
public static Boolean toBooleanObject(Integer value) {
if (value == null) {
return null;
}
return value.intValue() == 0 ? Boolean.FALSE : Boolean.TRUE;
}
/**
* 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
*
*
* @param value the Integer to convert
* @param trueValue the value to match for {@code true}
* @param falseValue the value to match for {@code false}
* @return {@code true} or {@code false}
* @throws IllegalArgumentException if no match
*/
public static boolean toBoolean(int value, int trueValue, int falseValue) {
if (value == trueValue) {
return true;
}
if (value == falseValue) {
return false;
}
// no match
throw new IllegalArgumentException("The Integer did not match either specified value");
}
/**
* 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
*
*
* @param value the Integer to convert
* @param trueValue the value to match for {@code true}, may be {@code null}
* @param falseValue the value to match for {@code false}, may be {@code null}
* @return {@code true} or {@code false}
* @throws IllegalArgumentException if no match
*/
public static boolean toBoolean(Integer value, Integer trueValue, Integer falseValue) {
if (value == null) {
if (trueValue == null) {
return true;
}
if (falseValue == null) {
return false;
}
} else if (value.equals(trueValue)) {
return true;
} else if (value.equals(falseValue)) {
return false;
}
// no match
throw new IllegalArgumentException("The Integer did not match either specified value");
}
/**
* Converts an int to a Boolean specifying the conversion values.
*
* NOTE: This returns null and will throw a NullPointerException if autoboxed to a boolean.
*
*
* BooleanUtils.toBooleanObject(0, 0, 2, 3) = Boolean.TRUE
* BooleanUtils.toBooleanObject(2, 1, 2, 3) = Boolean.FALSE
* BooleanUtils.toBooleanObject(3, 1, 2, 3) = null
*
*
* @param value the Integer to convert
* @param trueValue the value to match for {@code true}
* @param falseValue the value to match for {@code false}
* @param nullValue the value to to match for {@code null}
* @return Boolean.TRUE, Boolean.FALSE, or {@code null}
* @throws IllegalArgumentException if no match
*/
public static Boolean toBooleanObject(int value, int trueValue, int falseValue, int nullValue) {
if (value == trueValue) {
return Boolean.TRUE;
}
if (value == falseValue) {
return Boolean.FALSE;
}
if (value == nullValue) {
return null;
}
// no match
throw new IllegalArgumentException("The Integer did not match any specified value");
}
/**
* Converts an Integer to a Boolean specifying the conversion values.
*
* NOTE: This returns null and will throw a NullPointerException if autoboxed to a boolean.
*
*
* 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
*
*
* @param value the Integer to convert
* @param trueValue the value to match for {@code true}, may be {@code null}
* @param falseValue the value to match for {@code false}, may be {@code null}
* @param nullValue the value to to match for {@code null}, may be {@code null}
* @return Boolean.TRUE, Boolean.FALSE, or {@code null}
* @throws IllegalArgumentException if no match
*/
public static Boolean toBooleanObject(Integer value, Integer trueValue, Integer falseValue, Integer nullValue) {
if (value == null) {
if (trueValue == null) {
return Boolean.TRUE;
}
if (falseValue == null) {
return Boolean.FALSE;
}
if (nullValue == null) {
return null;
}
} else if (value.equals(trueValue)) {
return Boolean.TRUE;
} else if (value.equals(falseValue)) {
return Boolean.FALSE;
} else if (value.equals(nullValue)) {
return null;
}
// no match
throw new IllegalArgumentException("The Integer did not match any specified value");
}
// Boolean to Integer methods
//-----------------------------------------------------------------------
/**
* Converts a boolean to an int using the convention that
* {@code zero} is {@code false}.
*
*
* BooleanUtils.toInteger(true) = 1
* BooleanUtils.toInteger(false) = 0
*
*
* @param bool the boolean to convert
* @return one if {@code true}, zero if {@code false}
*/
public static int toInteger(boolean bool) {
return bool ? 1 : 0;
}
/**
* Converts a boolean to an Integer using the convention that
* {@code zero} is {@code false}.
*
*
* BooleanUtils.toIntegerObject(true) = new Integer(1)
* BooleanUtils.toIntegerObject(false) = new Integer(0)
*
*
* @param bool the boolean to convert
* @return one if {@code true}, zero if {@code false}
*/
public static Integer toIntegerObject(boolean bool) {
return bool ? NumberUtils.INTEGER_ONE : NumberUtils.INTEGER_ZERO;
}
/**
* Converts a Boolean to a Integer using the convention that
* {@code zero} is {@code false}.
*
* {@code null} will be converted to {@code null}.
*
*
* BooleanUtils.toIntegerObject(Boolean.TRUE) = new Integer(1)
* BooleanUtils.toIntegerObject(Boolean.FALSE) = new Integer(0)
*
*
* @param bool the Boolean to convert
* @return one if Boolean.TRUE, zero if Boolean.FALSE, {@code null} if {@code null}
*/
public static Integer toIntegerObject(Boolean bool) {
if (bool == null) {
return null;
}
return bool.booleanValue() ? NumberUtils.INTEGER_ONE : NumberUtils.INTEGER_ZERO;
}
/**
* Converts a boolean to an int specifying the conversion values.
*
*
* BooleanUtils.toInteger(true, 1, 0) = 1
* BooleanUtils.toInteger(false, 1, 0) = 0
*
*
* @param bool the to convert
* @param trueValue the value to return if {@code true}
* @param falseValue the value to return if {@code false}
* @return the appropriate value
*/
public static int toInteger(boolean bool, int trueValue, int falseValue) {
return bool ? trueValue : falseValue;
}
/**
* 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
*
*
* @param bool the Boolean to convert
* @param trueValue the value to return if {@code true}
* @param falseValue the value to return if {@code false}
* @param nullValue the value to return if {@code null}
* @return the appropriate value
*/
public static int toInteger(Boolean bool, int trueValue, int falseValue, int nullValue) {
if (bool == null) {
return nullValue;
}
return bool.booleanValue() ? trueValue : 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)
*
*
* @param bool the to convert
* @param trueValue the value to return if {@code true}, may be {@code null}
* @param falseValue the value to return if {@code false}, may be {@code null}
* @return the appropriate value
*/
public static Integer toIntegerObject(boolean bool, Integer trueValue, Integer falseValue) {
return bool ? trueValue : falseValue;
}
/**
* 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)
*
*
* @param bool the Boolean to convert
* @param trueValue the value to return if {@code true}, may be {@code null}
* @param falseValue the value to return if {@code false}, may be {@code null}
* @param nullValue the value to return if {@code null}, may be {@code null}
* @return the appropriate value
*/
public static Integer toIntegerObject(Boolean bool, Integer trueValue, Integer falseValue, Integer nullValue) {
if (bool == null) {
return nullValue;
}
return bool.booleanValue() ? trueValue : falseValue;
}
// String to Boolean methods
//-----------------------------------------------------------------------
/**
* Converts a String to a Boolean.
*
* {@code 'true'}, {@code 'on'} or {@code 'yes'}
* (case insensitive) will return {@code true}.
* {@code 'false'}, {@code 'off'} or {@code 'no'}
* (case insensitive) will return {@code false}.
* Otherwise, {@code null} is returned.
*
* NOTE: This returns null and will throw a NullPointerException if autoboxed to a boolean.
*
*
* 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
*
*
* @param str the String to check
* @return the Boolean value of the string, {@code null} if no match or {@code null} input
*/
public static Boolean toBooleanObject(String str) {
// Previously used equalsIgnoreCase, which was fast for interned 'true'.
// Non interned 'true' matched 15 times slower.
//
// Optimisation provides same performance as before for interned 'true'.
// Similar performance for null, 'false', and other strings not length 2/3/4.
// 'true'/'TRUE' match 4 times slower, 'tRUE'/'True' 7 times slower.
if (str == "true") {
return Boolean.TRUE;
}
if (str == null) {
return null;
}
switch (str.length()) {
case 1: {
char ch0 = str.charAt(0);
if ((ch0 == 'y' || ch0 == 'Y') ||
(ch0 == 't' || ch0 == 'T')) {
return Boolean.TRUE;
}
if ((ch0 == 'n' || ch0 == 'N') ||
(ch0 == 'f' || ch0 == 'F')) {
return Boolean.FALSE;
}
break;
}
case 2: {
char ch0 = str.charAt(0);
char ch1 = str.charAt(1);
if ((ch0 == 'o' || ch0 == 'O') &&
(ch1 == 'n' || ch1 == 'N') ) {
return Boolean.TRUE;
}
if ((ch0 == 'n' || ch0 == 'N') &&
(ch1 == 'o' || ch1 == 'O') ) {
return Boolean.FALSE;
}
break;
}
case 3: {
char ch0 = str.charAt(0);
char ch1 = str.charAt(1);
char ch2 = str.charAt(2);
if ((ch0 == 'y' || ch0 == 'Y') &&
(ch1 == 'e' || ch1 == 'E') &&
(ch2 == 's' || ch2 == 'S') ) {
return Boolean.TRUE;
}
if ((ch0 == 'o' || ch0 == 'O') &&
(ch1 == 'f' || ch1 == 'F') &&
(ch2 == 'f' || ch2 == 'F') ) {
return Boolean.FALSE;
}
break;
}
case 4: {
char ch0 = str.charAt(0);
char ch1 = str.charAt(1);
char ch2 = str.charAt(2);
char ch3 = str.charAt(3);
if ((ch0 == 't' || ch0 == 'T') &&
(ch1 == 'r' || ch1 == 'R') &&
(ch2 == 'u' || ch2 == 'U') &&
(ch3 == 'e' || ch3 == 'E') ) {
return Boolean.TRUE;
}
break;
}
case 5: {
char ch0 = str.charAt(0);
char ch1 = str.charAt(1);
char ch2 = str.charAt(2);
char ch3 = str.charAt(3);
char ch4 = str.charAt(4);
if ((ch0 == 'f' || ch0 == 'F') &&
(ch1 == 'a' || ch1 == 'A') &&
(ch2 == 'l' || ch2 == 'L') &&
(ch3 == 's' || ch3 == 'S') &&
(ch4 == 'e' || ch4 == 'E') ) {
return Boolean.FALSE;
}
break;
}
}
return null;
}
/**
* Converts a String to a Boolean throwing an exception if no match.
*
* NOTE: This returns null and will throw a NullPointerException if autoboxed to a boolean.
*
*
* BooleanUtils.toBooleanObject("true", "true", "false", "null") = Boolean.TRUE
* BooleanUtils.toBooleanObject("false", "true", "false", "null") = Boolean.FALSE
* BooleanUtils.toBooleanObject("null", "true", "false", "null") = null
*
*
* @param str the String to check
* @param trueString the String to match for {@code true} (case sensitive), may be {@code null}
* @param falseString the String to match for {@code false} (case sensitive), may be {@code null}
* @param nullString the String to match for {@code null} (case sensitive), may be {@code null}
* @return the Boolean value of the string, {@code null} if either the String matches {@code nullString}
* or if {@code null} input and {@code nullString} is {@code null}
* @throws IllegalArgumentException if the String doesn't match
*/
public static Boolean toBooleanObject(String str, String trueString, String falseString, String nullString) {
if (str == null) {
if (trueString == null) {
return Boolean.TRUE;
}
if (falseString == null) {
return Boolean.FALSE;
}
if (nullString == null) {
return null;
}
} else if (str.equals(trueString)) {
return Boolean.TRUE;
} else if (str.equals(falseString)) {
return Boolean.FALSE;
} else if (str.equals(nullString)) {
return null;
}
// no match
throw new IllegalArgumentException("The String did not match any specified value");
}
// String to boolean methods
//-----------------------------------------------------------------------
/**
* Converts a String to a boolean (optimised for performance).
*
* {@code 'true'}, {@code 'on'} or {@code 'yes'}
* (case insensitive) will return {@code true}. Otherwise,
* {@code false} is returned.
*
* This method performs 4 times faster (JDK1.4) than
* {@code 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
*
*
* @param str the String to check
* @return the boolean value of the string, {@code false} if no match or the String is null
*/
public static boolean toBoolean(String str) {
return toBooleanObject(str) == Boolean.TRUE;
}
/**
* 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
*
*
* @param str the String to check
* @param trueString the String to match for {@code true} (case sensitive), may be {@code null}
* @param falseString the String to match for {@code false} (case sensitive), may be {@code null}
* @return the boolean value of the string
* @throws IllegalArgumentException if the String doesn't match
*/
public static boolean toBoolean(String str, String trueString, String falseString) {
if (str == trueString) {
return true;
} else if (str == falseString) {
return false;
} else if (str != null) {
if (str.equals(trueString)) {
return true;
} else if (str.equals(falseString)) {
return false;
}
}
// no match
throw new IllegalArgumentException("The String did not match either specified value");
}
// Boolean to String methods
//-----------------------------------------------------------------------
/**
* Converts a Boolean to a String returning {@code 'true'},
* {@code 'false'}, or {@code null}.
*
*
* BooleanUtils.toStringTrueFalse(Boolean.TRUE) = "true"
* BooleanUtils.toStringTrueFalse(Boolean.FALSE) = "false"
* BooleanUtils.toStringTrueFalse(null) = null;
*
*
* @param bool the Boolean to check
* @return {@code 'true'}, {@code 'false'}, or {@code null}
*/
public static String toStringTrueFalse(Boolean bool) {
return toString(bool, "true", "false", null);
}
/**
* Converts a Boolean to a String returning {@code 'on'},
* {@code 'off'}, or {@code null}.
*
*
* BooleanUtils.toStringOnOff(Boolean.TRUE) = "on"
* BooleanUtils.toStringOnOff(Boolean.FALSE) = "off"
* BooleanUtils.toStringOnOff(null) = null;
*
*
* @param bool the Boolean to check
* @return {@code 'on'}, {@code 'off'}, or {@code null}
*/
public static String toStringOnOff(Boolean bool) {
return toString(bool, "on", "off", null);
}
/**
* Converts a Boolean to a String returning {@code 'yes'},
* {@code 'no'}, or {@code null}.
*
*
* BooleanUtils.toStringYesNo(Boolean.TRUE) = "yes"
* BooleanUtils.toStringYesNo(Boolean.FALSE) = "no"
* BooleanUtils.toStringYesNo(null) = null;
*
*
* @param bool the Boolean to check
* @return {@code 'yes'}, {@code 'no'}, or {@code null}
*/
public static String toStringYesNo(Boolean bool) {
return toString(bool, "yes", "no", null);
}
/**
* 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;
*
*
* @param bool the Boolean to check
* @param trueString the String to return if {@code true}, may be {@code null}
* @param falseString the String to return if {@code false}, may be {@code null}
* @param nullString the String to return if {@code null}, may be {@code null}
* @return one of the three input Strings
*/
public static String toString(Boolean bool, String trueString, String falseString, String nullString) {
if (bool == null) {
return nullString;
}
return bool.booleanValue() ? trueString : falseString;
}
// boolean to String methods
//-----------------------------------------------------------------------
/**
* Converts a boolean to a String returning {@code 'true'}
* or {@code 'false'}.
*
*
* BooleanUtils.toStringTrueFalse(true) = "true"
* BooleanUtils.toStringTrueFalse(false) = "false"
*
*
* @param bool the Boolean to check
* @return {@code 'true'}, {@code 'false'}, or {@code null}
*/
public static String toStringTrueFalse(boolean bool) {
return toString(bool, "true", "false");
}
/**
* Converts a boolean to a String returning {@code 'on'}
* or {@code 'off'}.
*
*
* BooleanUtils.toStringOnOff(true) = "on"
* BooleanUtils.toStringOnOff(false) = "off"
*
*
* @param bool the Boolean to check
* @return {@code 'on'}, {@code 'off'}, or {@code null}
*/
public static String toStringOnOff(boolean bool) {
return toString(bool, "on", "off");
}
/**
* Converts a boolean to a String returning {@code 'yes'}
* or {@code 'no'}.
*
*
* BooleanUtils.toStringYesNo(true) = "yes"
* BooleanUtils.toStringYesNo(false) = "no"
*
*
* @param bool the Boolean to check
* @return {@code 'yes'}, {@code 'no'}, or {@code null}
*/
public static String toStringYesNo(boolean bool) {
return toString(bool, "yes", "no");
}
/**
* Converts a boolean to a String returning one of the input Strings.
*
*
* BooleanUtils.toString(true, "true", "false") = "true"
* BooleanUtils.toString(false, "true", "false") = "false"
*
*
* @param bool the Boolean to check
* @param trueString the String to return if {@code true}, may be {@code null}
* @param falseString the String to return if {@code false}, may be {@code null}
* @return one of the two input Strings
*/
public static String toString(boolean bool, String trueString, String falseString) {
return bool ? trueString : falseString;
}
// xor methods
// ----------------------------------------------------------------------
/**
* 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
*
*
* @param array an array of {@code boolean}s
* @return {@code true} if the xor is successful.
* @throws IllegalArgumentException if {@code array} is {@code null}
* @throws IllegalArgumentException if {@code array} is empty.
*/
public static boolean xor(boolean... array) {
// Validates input
if (array == null) {
throw new IllegalArgumentException("The Array must not be null");
}
if (array.length == 0) {
throw new IllegalArgumentException("Array is empty");
}
// Loops through array, comparing each item
int trueCount = 0;
for (boolean element : array) {
// If item is true, and trueCount is < 1, increments count
// Else, xor fails
if (element) {
if (trueCount < 1) {
trueCount++;
} else {
return false;
}
}
}
// Returns true if there was exactly 1 true item
return trueCount == 1;
}
/**
* 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
*
*
* @param array an array of {@code Boolean}s
* @return {@code true} if the xor is successful.
* @throws IllegalArgumentException if {@code array} is {@code null}
* @throws IllegalArgumentException if {@code array} is empty.
* @throws IllegalArgumentException if {@code array} contains a {@code null}
*/
public static Boolean xor(Boolean... array) {
if (array == null) {
throw new IllegalArgumentException("The Array must not be null");
}
if (array.length == 0) {
throw new IllegalArgumentException("Array is empty");
}
boolean[] primitive = null;
try {
primitive = ArrayUtils.toPrimitive(array);
} catch (NullPointerException ex) {
throw new IllegalArgumentException("The array must not contain any null elements");
}
return xor(primitive) ? Boolean.TRUE : Boolean.FALSE;
}
}