| /* |
| * 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.lang; |
| |
| import org.apache.commons.lang.math.NumberUtils; |
| |
| /** |
| * <p>Operations on boolean primitives and Boolean objects.</p> |
| * |
| * <p>This class tries to handle <code>null</code> input gracefully. |
| * An exception will not be thrown for a <code>null</code> input. |
| * Each method documents its behaviour in more detail.</p> |
| * |
| * @author Stephen Colebourne |
| * @author Matthew Hawthorne |
| * @author Gary Gregory |
| * @since 2.0 |
| * @version $Id$ |
| */ |
| public class BooleanUtils { |
| |
| /** |
| * <p><code>BooleanUtils</code> instances should NOT be constructed in standard programming. |
| * Instead, the class should be used as <code>BooleanUtils.toBooleanObject(true);</code>.</p> |
| * |
| * <p>This constructor is public to permit tools that require a JavaBean instance |
| * to operate.</p> |
| */ |
| public BooleanUtils() { |
| super(); |
| } |
| |
| // Boolean utilities |
| //-------------------------------------------------------------------------- |
| /** |
| * <p>Negates the specified boolean.</p> |
| * |
| * <p>If <code>null</code> is passed in, <code>null</code> will be returned.</p> |
| * |
| * <pre> |
| * BooleanUtils.negate(Boolean.TRUE) = Boolean.FALSE; |
| * BooleanUtils.negate(Boolean.FALSE) = Boolean.TRUE; |
| * BooleanUtils.negate(null) = null; |
| * </pre> |
| * |
| * @param bool the Boolean to negate, may be null |
| * @return the negated Boolean, or <code>null</code> if <code>null</code> input |
| */ |
| public static Boolean negate(Boolean bool) { |
| if (bool == null) { |
| return null; |
| } |
| return (bool.booleanValue() ? Boolean.FALSE : Boolean.TRUE); |
| } |
| |
| // boolean Boolean methods |
| //----------------------------------------------------------------------- |
| /** |
| * <p>Checks if a <code>Boolean</code> value is <code>true</code>, |
| * handling <code>null</code> by returning <code>false</code>.</p> |
| * |
| * <pre> |
| * BooleanUtils.isTrue(Boolean.TRUE) = true |
| * BooleanUtils.isTrue(Boolean.FALSE) = false |
| * BooleanUtils.isTrue(null) = false |
| * </pre> |
| * |
| * @param bool the boolean to check, null returns <code>false</code> |
| * @return <code>true</code> only if the input is non-null and true |
| * @since 2.1 |
| */ |
| public static boolean isTrue(Boolean bool) { |
| if (bool == null) { |
| return false; |
| } |
| return bool.booleanValue() ? true : false; |
| } |
| |
| /** |
| * <p>Checks if a <code>Boolean</code> value is <i>not</i> <code>true</code>, |
| * handling <code>null</code> by returning <code>true</code>.</p> |
| * |
| * <pre> |
| * BooleanUtils.isNotTrue(Boolean.TRUE) = false |
| * BooleanUtils.isNotTrue(Boolean.FALSE) = true |
| * BooleanUtils.isNotTrue(null) = true |
| * </pre> |
| * |
| * @param bool the boolean to check, null returns <code>true</code> |
| * @return <code>true</code> if the input is null or false |
| * @since 2.3 |
| */ |
| public static boolean isNotTrue(Boolean bool) { |
| return !isTrue(bool); |
| } |
| |
| /** |
| * <p>Checks if a <code>Boolean</code> value is <code>false</code>, |
| * handling <code>null</code> by returning <code>false</code>.</p> |
| * |
| * <pre> |
| * BooleanUtils.isFalse(Boolean.TRUE) = false |
| * BooleanUtils.isFalse(Boolean.FALSE) = true |
| * BooleanUtils.isFalse(null) = false |
| * </pre> |
| * |
| * @param bool the boolean to check, null returns <code>false</code> |
| * @return <code>true</code> only if the input is non-null and false |
| * @since 2.1 |
| */ |
| public static boolean isFalse(Boolean bool) { |
| if (bool == null) { |
| return false; |
| } |
| return bool.booleanValue() ? false : true; |
| } |
| |
| /** |
| * <p>Checks if a <code>Boolean</code> value is <i>not</i> <code>false</code>, |
| * handling <code>null</code> by returning <code>true</code>.</p> |
| * |
| * <pre> |
| * BooleanUtils.isNotFalse(Boolean.TRUE) = true |
| * BooleanUtils.isNotFalse(Boolean.FALSE) = false |
| * BooleanUtils.isNotFalse(null) = true |
| * </pre> |
| * |
| * @param bool the boolean to check, null returns <code>true</code> |
| * @return <code>true</code> if the input is null or true |
| * @since 2.3 |
| */ |
| public static boolean isNotFalse(Boolean bool) { |
| return !isFalse(bool); |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * <p>Boolean factory that avoids creating new Boolean objecs all the time.</p> |
| * |
| * <p>This method was added to JDK1.4 but is available here for earlier JDKs.</p> |
| * |
| * <pre> |
| * BooleanUtils.toBooleanObject(false) = Boolean.FALSE |
| * BooleanUtils.toBooleanObject(true) = Boolean.TRUE |
| * </pre> |
| * |
| * @param bool the boolean to convert |
| * @return Boolean.TRUE or Boolean.FALSE as appropriate |
| */ |
| public static Boolean toBooleanObject(boolean bool) { |
| return bool ? Boolean.TRUE : Boolean.FALSE; |
| } |
| |
| /** |
| * <p>Converts a Boolean to a boolean handling <code>null</code> |
| * by returning <code>false</code>.</p> |
| * |
| * <pre> |
| * BooleanUtils.toBoolean(Boolean.TRUE) = true |
| * BooleanUtils.toBoolean(Boolean.FALSE) = false |
| * BooleanUtils.toBoolean(null) = false |
| * </pre> |
| * |
| * @param bool the boolean to convert |
| * @return <code>true</code> or <code>false</code>, |
| * <code>null</code> returns <code>false</code> |
| */ |
| public static boolean toBoolean(Boolean bool) { |
| if (bool == null) { |
| return false; |
| } |
| return bool.booleanValue() ? true : false; |
| } |
| |
| /** |
| * <p>Converts a Boolean to a boolean handling <code>null</code>.</p> |
| * |
| * <pre> |
| * BooleanUtils.toBooleanDefaultIfNull(Boolean.TRUE, false) = true |
| * BooleanUtils.toBooleanDefaultIfNull(Boolean.FALSE, true) = false |
| * BooleanUtils.toBooleanDefaultIfNull(null, true) = true |
| * </pre> |
| * |
| * @param bool the boolean to convert |
| * @param valueIfNull the boolean value to return if <code>null</code> |
| * @return <code>true</code> or <code>false</code> |
| */ |
| public static boolean toBooleanDefaultIfNull(Boolean bool, boolean valueIfNull) { |
| if (bool == null) { |
| return valueIfNull; |
| } |
| return bool.booleanValue() ? true : false; |
| } |
| |
| // Integer to Boolean methods |
| //----------------------------------------------------------------------- |
| /** |
| * <p>Converts an int to a boolean using the convention that <code>zero</code> |
| * is <code>false</code>.</p> |
| * |
| * <pre> |
| * BooleanUtils.toBoolean(0) = false |
| * BooleanUtils.toBoolean(1) = true |
| * BooleanUtils.toBoolean(2) = true |
| * </pre> |
| * |
| * @param value the int to convert |
| * @return <code>true</code> if non-zero, <code>false</code> |
| * if zero |
| */ |
| public static boolean toBoolean(int value) { |
| return value == 0 ? false : true; |
| } |
| |
| /** |
| * <p>Converts an int to a Boolean using the convention that <code>zero</code> |
| * is <code>false</code>.</p> |
| * |
| * <pre> |
| * BooleanUtils.toBoolean(0) = Boolean.FALSE |
| * BooleanUtils.toBoolean(1) = Boolean.TRUE |
| * BooleanUtils.toBoolean(2) = Boolean.TRUE |
| * </pre> |
| * |
| * @param value the int to convert |
| * @return Boolean.TRUE if non-zero, Boolean.FALSE if zero, |
| * <code>null</code> if <code>null</code> |
| */ |
| public static Boolean toBooleanObject(int value) { |
| return value == 0 ? Boolean.FALSE : Boolean.TRUE; |
| } |
| |
| /** |
| * <p>Converts an Integer to a Boolean using the convention that <code>zero</code> |
| * is <code>false</code>.</p> |
| * |
| * <p><code>null</code> will be converted to <code>null</code>.</p> |
| * |
| * <pre> |
| * BooleanUtils.toBoolean(new Integer(0)) = Boolean.FALSE |
| * BooleanUtils.toBoolean(new Integer(1)) = Boolean.TRUE |
| * BooleanUtils.toBoolean(new Integer(null)) = null |
| * </pre> |
| * |
| * @param value the Integer to convert |
| * @return Boolean.TRUE if non-zero, Boolean.FALSE if zero, |
| * <code>null</code> if <code>null</code> input |
| */ |
| public static Boolean toBooleanObject(Integer value) { |
| if (value == null) { |
| return null; |
| } |
| return value.intValue() == 0 ? Boolean.FALSE : Boolean.TRUE; |
| } |
| |
| /** |
| * <p>Converts an int to a boolean specifying the conversion values.</p> |
| * |
| * <pre> |
| * BooleanUtils.toBoolean(0, 1, 0) = false |
| * BooleanUtils.toBoolean(1, 1, 0) = true |
| * BooleanUtils.toBoolean(2, 1, 2) = false |
| * BooleanUtils.toBoolean(2, 2, 0) = true |
| * </pre> |
| * |
| * @param value the Integer to convert |
| * @param trueValue the value to match for <code>true</code> |
| * @param falseValue the value to match for <code>false</code> |
| * @return <code>true</code> or <code>false</code> |
| * @throws IllegalArgumentException if no match |
| */ |
| public static boolean toBoolean(int value, int trueValue, int falseValue) { |
| if (value == trueValue) { |
| return true; |
| } else if (value == falseValue) { |
| return false; |
| } |
| // no match |
| throw new IllegalArgumentException("The Integer did not match either specified value"); |
| } |
| |
| /** |
| * <p>Converts an Integer to a boolean specifying the conversion values.</p> |
| * |
| * <pre> |
| * 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 |
| * </pre> |
| * |
| * @param value the Integer to convert |
| * @param trueValue the value to match for <code>true</code>, |
| * may be <code>null</code> |
| * @param falseValue the value to match for <code>false</code>, |
| * may be <code>null</code> |
| * @return <code>true</code> or <code>false</code> |
| * @throws IllegalArgumentException if no match |
| */ |
| public static boolean toBoolean(Integer value, Integer trueValue, Integer falseValue) { |
| if (value == null) { |
| if (trueValue == null) { |
| return true; |
| } else 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"); |
| } |
| |
| /** |
| * <p>Converts an int to a Boolean specifying the conversion values.</p> |
| * |
| * <pre> |
| * BooleanUtils.toBooleanObject(0, 0, 2, 3) = Boolean.TRUE |
| * BooleanUtils.toBooleanObject(2, 1, 2, 3) = Boolean.FALSE |
| * BooleanUtils.toBooleanObject(3, 1, 2, 3) = null |
| * </pre> |
| * |
| * @param value the Integer to convert |
| * @param trueValue the value to match for <code>true</code> |
| * @param falseValue the value to match for <code>false</code> |
| * @param nullValue the value to to match for <code>null</code> |
| * @return Boolean.TRUE, Boolean.FALSE, or <code>null</code> |
| * @throws IllegalArgumentException if no match |
| */ |
| public static Boolean toBooleanObject(int value, int trueValue, int falseValue, int nullValue) { |
| if (value == trueValue) { |
| return Boolean.TRUE; |
| } else if (value == falseValue) { |
| return Boolean.FALSE; |
| } else if (value == nullValue) { |
| return null; |
| } |
| // no match |
| throw new IllegalArgumentException("The Integer did not match any specified value"); |
| } |
| |
| /** |
| * <p>Converts an Integer to a Boolean specifying the conversion values.</p> |
| * |
| * <pre> |
| * 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 |
| * </pre> |
| * |
| * @param value the Integer to convert |
| * @param trueValue the value to match for <code>true</code>, |
| * may be <code>null</code> |
| * @param falseValue the value to match for <code>false</code>, |
| * may be <code>null</code> |
| * @param nullValue the value to to match for <code>null</code>, |
| * may be <code>null</code> |
| * @return Boolean.TRUE, Boolean.FALSE, or <code>null</code> |
| * @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; |
| } else if (falseValue == null) { |
| return Boolean.FALSE; |
| } else 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 |
| //----------------------------------------------------------------------- |
| /** |
| * <p>Converts a boolean to an int using the convention that |
| * <code>zero</code> is <code>false</code>.</p> |
| * |
| * <pre> |
| * BooleanUtils.toInteger(true) = 1 |
| * BooleanUtils.toInteger(false) = 0 |
| * </pre> |
| * |
| * @param bool the boolean to convert |
| * @return one if <code>true</code>, zero if <code>false</code> |
| */ |
| public static int toInteger(boolean bool) { |
| return bool ? 1 : 0; |
| } |
| |
| /** |
| * <p>Converts a boolean to an Integer using the convention that |
| * <code>zero</code> is <code>false</code>.</p> |
| * |
| * <pre> |
| * BooleanUtils.toIntegerObject(true) = new Integer(1) |
| * BooleanUtils.toIntegerObject(false) = new Integer(0) |
| * </pre> |
| * |
| * @param bool the boolean to convert |
| * @return one if <code>true</code>, zero if <code>false</code> |
| */ |
| public static Integer toIntegerObject(boolean bool) { |
| return bool ? NumberUtils.INTEGER_ONE : NumberUtils.INTEGER_ZERO; |
| } |
| |
| /** |
| * <p>Converts a Boolean to a Integer using the convention that |
| * <code>zero</code> is <code>false</code>.</p> |
| * |
| * <p><code>null</code> will be converted to <code>null</code>.</p> |
| * |
| * <pre> |
| * BooleanUtils.toIntegerObject(Boolean.TRUE) = new Integer(1) |
| * BooleanUtils.toIntegerObject(Boolean.FALSE) = new Integer(0) |
| * </pre> |
| * |
| * @param bool the Boolean to convert |
| * @return one if Boolean.TRUE, zero if Boolean.FALSE, <code>null</code> if <code>null</code> |
| */ |
| public static Integer toIntegerObject(Boolean bool) { |
| if (bool == null) { |
| return null; |
| } |
| return bool.booleanValue() ? NumberUtils.INTEGER_ONE : NumberUtils.INTEGER_ZERO; |
| } |
| |
| /** |
| * <p>Converts a boolean to an int specifying the conversion values.</p> |
| * |
| * <pre> |
| * BooleanUtils.toInteger(true, 1, 0) = 1 |
| * BooleanUtils.toInteger(false, 1, 0) = 0 |
| * </pre> |
| * |
| * @param bool the to convert |
| * @param trueValue the value to return if <code>true</code> |
| * @param falseValue the value to return if <code>false</code> |
| * @return the appropriate value |
| */ |
| public static int toInteger(boolean bool, int trueValue, int falseValue) { |
| return bool ? trueValue : falseValue; |
| } |
| |
| /** |
| * <p>Converts a Boolean to an int specifying the conversion values.</p> |
| * |
| * <pre> |
| * BooleanUtils.toInteger(Boolean.TRUE, 1, 0, 2) = 1 |
| * BooleanUtils.toInteger(Boolean.FALSE, 1, 0, 2) = 0 |
| * BooleanUtils.toInteger(null, 1, 0, 2) = 2 |
| * </pre> |
| * |
| * @param bool the Boolean to convert |
| * @param trueValue the value to return if <code>true</code> |
| * @param falseValue the value to return if <code>false</code> |
| * @param nullValue the value to return if <code>null</code> |
| * @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; |
| } |
| |
| /** |
| * <p>Converts a boolean to an Integer specifying the conversion values.</p> |
| * |
| * <pre> |
| * BooleanUtils.toIntegerObject(true, new Integer(1), new Integer(0)) = new Integer(1) |
| * BooleanUtils.toIntegerObject(false, new Integer(1), new Integer(0)) = new Integer(0) |
| * </pre> |
| * |
| * @param bool the to convert |
| * @param trueValue the value to return if <code>true</code>, |
| * may be <code>null</code> |
| * @param falseValue the value to return if <code>false</code>, |
| * may be <code>null</code> |
| * @return the appropriate value |
| */ |
| public static Integer toIntegerObject(boolean bool, Integer trueValue, Integer falseValue) { |
| return bool ? trueValue : falseValue; |
| } |
| |
| /** |
| * <p>Converts a Boolean to an Integer specifying the conversion values.</p> |
| * |
| * <pre> |
| * 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) |
| * </pre> |
| * |
| * @param bool the Boolean to convert |
| * @param trueValue the value to return if <code>true</code>, |
| * may be <code>null</code> |
| * @param falseValue the value to return if <code>false</code>, |
| * may be <code>null</code> |
| * @param nullValue the value to return if <code>null</code>, |
| * may be <code>null</code> |
| * @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 |
| //----------------------------------------------------------------------- |
| /** |
| * <p>Converts a String to a Boolean.</p> |
| * |
| * <p><code>'true'</code>, <code>'on'</code> or <code>'yes'</code> |
| * (case insensitive) will return <code>true</code>. |
| * <code>'false'</code>, <code>'off'</code> or <code>'no'</code> |
| * (case insensitive) will return <code>false</code>. |
| * Otherwise, <code>null</code> is returned.</p> |
| * |
| * <pre> |
| * 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 |
| * </pre> |
| * |
| * @param str the String to check |
| * @return the Boolean value of the string, |
| * <code>null</code> if no match or <code>null</code> input |
| */ |
| public static Boolean toBooleanObject(String str) { |
| if ("true".equalsIgnoreCase(str)) { |
| return Boolean.TRUE; |
| } else if ("false".equalsIgnoreCase(str)) { |
| return Boolean.FALSE; |
| } else if ("on".equalsIgnoreCase(str)) { |
| return Boolean.TRUE; |
| } else if ("off".equalsIgnoreCase(str)) { |
| return Boolean.FALSE; |
| } else if ("yes".equalsIgnoreCase(str)) { |
| return Boolean.TRUE; |
| } else if ("no".equalsIgnoreCase(str)) { |
| return Boolean.FALSE; |
| } |
| // no match |
| return null; |
| } |
| |
| /** |
| * <p>Converts a String to a Boolean throwing an exception if no match.</p> |
| * |
| * <pre> |
| * BooleanUtils.toBooleanObject("true", "true", "false", "null") = Boolean.TRUE |
| * BooleanUtils.toBooleanObject("false", "true", "false", "null") = Boolean.FALSE |
| * BooleanUtils.toBooleanObject("null", "true", "false", "null") = null |
| * </pre> |
| * |
| * @param str the String to check |
| * @param trueString the String to match for <code>true</code> |
| * (case sensitive), may be <code>null</code> |
| * @param falseString the String to match for <code>false</code> |
| * (case sensitive), may be <code>null</code> |
| * @param nullString the String to match for <code>null</code> |
| * (case sensitive), may be <code>null</code> |
| * @return the Boolean value of the string, |
| * <code>null</code> if either the String matches <code>nullString</code> |
| * or if <code>null</code> input and <code>nullString</code> is |
| * <code>null</code> |
| * @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; |
| } else if (falseString == null) { |
| return Boolean.FALSE; |
| } else 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 |
| //----------------------------------------------------------------------- |
| /** |
| * <p>Converts a String to a boolean (optimised for performance).</p> |
| * |
| * <p><code>'true'</code>, <code>'on'</code> or <code>'yes'</code> |
| * (case insensitive) will return <code>true</code>. Otherwise, |
| * <code>false</code> is returned.</p> |
| * |
| * <p>This method performs 4 times faster (JDK1.4) than |
| * <code>Boolean.valueOf(String)</code>. However, this method accepts |
| * 'on' and 'yes' as true values. |
| * |
| * <pre> |
| * 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 |
| * </pre> |
| * |
| * @param str the String to check |
| * @return the boolean value of the string, <code>false</code> if no match |
| */ |
| public static boolean toBoolean(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 true; |
| } |
| if (str == null) { |
| return false; |
| } |
| switch (str.length()) { |
| case 2: { |
| char ch0 = str.charAt(0); |
| char ch1 = str.charAt(1); |
| return |
| (ch0 == 'o' || ch0 == 'O') && |
| (ch1 == 'n' || ch1 == 'N'); |
| } |
| case 3: { |
| char ch = str.charAt(0); |
| if (ch == 'y') { |
| return |
| (str.charAt(1) == 'e' || str.charAt(1) == 'E') && |
| (str.charAt(2) == 's' || str.charAt(2) == 'S'); |
| } |
| if (ch == 'Y') { |
| return |
| (str.charAt(1) == 'E' || str.charAt(1) == 'e') && |
| (str.charAt(2) == 'S' || str.charAt(2) == 's'); |
| } |
| return false; |
| } |
| case 4: { |
| char ch = str.charAt(0); |
| if (ch == 't') { |
| return |
| (str.charAt(1) == 'r' || str.charAt(1) == 'R') && |
| (str.charAt(2) == 'u' || str.charAt(2) == 'U') && |
| (str.charAt(3) == 'e' || str.charAt(3) == 'E'); |
| } |
| if (ch == 'T') { |
| return |
| (str.charAt(1) == 'R' || str.charAt(1) == 'r') && |
| (str.charAt(2) == 'U' || str.charAt(2) == 'u') && |
| (str.charAt(3) == 'E' || str.charAt(3) == 'e'); |
| } |
| } |
| } |
| return false; |
| } |
| |
| // public static void main(String[] args) { |
| // long start = System.currentTimeMillis(); |
| // boolean flag = true; |
| // int count = 0; |
| // for (int i = 0; i < 100000000; i++) { |
| // flag = toBoolean("YES"); |
| // } |
| // long end = System.currentTimeMillis(); |
| // System.out.println((end - start) + " " + flag + " " + count); |
| // } |
| |
| /** |
| * <p>Converts a String to a Boolean throwing an exception if no match found.</p> |
| * |
| * <p>null is returned if there is no match.</p> |
| * |
| * <pre> |
| * BooleanUtils.toBoolean("true", "true", "false") = true |
| * BooleanUtils.toBoolean("false", "true", "false") = false |
| * </pre> |
| * |
| * @param str the String to check |
| * @param trueString the String to match for <code>true</code> |
| * (case sensitive), may be <code>null</code> |
| * @param falseString the String to match for <code>false</code> |
| * (case sensitive), may be <code>null</code> |
| * @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 == null) { |
| if (trueString == null) { |
| return true; |
| } else if (falseString == null) { |
| return false; |
| } |
| } else 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 |
| //----------------------------------------------------------------------- |
| /** |
| * <p>Converts a Boolean to a String returning <code>'true'</code>, |
| * <code>'false'</code>, or <code>null</code>.</p> |
| * |
| * <pre> |
| * BooleanUtils.toStringTrueFalse(Boolean.TRUE) = "true" |
| * BooleanUtils.toStringTrueFalse(Boolean.FALSE) = "false" |
| * BooleanUtils.toStringTrueFalse(null) = null; |
| * </pre> |
| * |
| * @param bool the Boolean to check |
| * @return <code>'true'</code>, <code>'false'</code>, |
| * or <code>null</code> |
| */ |
| public static String toStringTrueFalse(Boolean bool) { |
| return toString(bool, "true", "false", null); |
| } |
| |
| /** |
| * <p>Converts a Boolean to a String returning <code>'on'</code>, |
| * <code>'off'</code>, or <code>null</code>.</p> |
| * |
| * <pre> |
| * BooleanUtils.toStringOnOff(Boolean.TRUE) = "on" |
| * BooleanUtils.toStringOnOff(Boolean.FALSE) = "off" |
| * BooleanUtils.toStringOnOff(null) = null; |
| * </pre> |
| * |
| * @param bool the Boolean to check |
| * @return <code>'on'</code>, <code>'off'</code>, |
| * or <code>null</code> |
| */ |
| public static String toStringOnOff(Boolean bool) { |
| return toString(bool, "on", "off", null); |
| } |
| |
| /** |
| * <p>Converts a Boolean to a String returning <code>'yes'</code>, |
| * <code>'no'</code>, or <code>null</code>.</p> |
| * |
| * <pre> |
| * BooleanUtils.toStringYesNo(Boolean.TRUE) = "yes" |
| * BooleanUtils.toStringYesNo(Boolean.FALSE) = "no" |
| * BooleanUtils.toStringYesNo(null) = null; |
| * </pre> |
| * |
| * @param bool the Boolean to check |
| * @return <code>'yes'</code>, <code>'no'</code>, |
| * or <code>null</code> |
| */ |
| public static String toStringYesNo(Boolean bool) { |
| return toString(bool, "yes", "no", null); |
| } |
| |
| /** |
| * <p>Converts a Boolean to a String returning one of the input Strings.</p> |
| * |
| * <pre> |
| * BooleanUtils.toString(Boolean.TRUE, "true", "false", null) = "true" |
| * BooleanUtils.toString(Boolean.FALSE, "true", "false", null) = "false" |
| * BooleanUtils.toString(null, "true", "false", null) = null; |
| * </pre> |
| * |
| * @param bool the Boolean to check |
| * @param trueString the String to return if <code>true</code>, |
| * may be <code>null</code> |
| * @param falseString the String to return if <code>false</code>, |
| * may be <code>null</code> |
| * @param nullString the String to return if <code>null</code>, |
| * may be <code>null</code> |
| * @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 |
| //----------------------------------------------------------------------- |
| /** |
| * <p>Converts a boolean to a String returning <code>'true'</code> |
| * or <code>'false'</code>.</p> |
| * |
| * <pre> |
| * BooleanUtils.toStringTrueFalse(true) = "true" |
| * BooleanUtils.toStringTrueFalse(false) = "false" |
| * </pre> |
| * |
| * @param bool the Boolean to check |
| * @return <code>'true'</code>, <code>'false'</code>, |
| * or <code>null</code> |
| */ |
| public static String toStringTrueFalse(boolean bool) { |
| return toString(bool, "true", "false"); |
| } |
| |
| /** |
| * <p>Converts a boolean to a String returning <code>'on'</code> |
| * or <code>'off'</code>.</p> |
| * |
| * <pre> |
| * BooleanUtils.toStringOnOff(true) = "on" |
| * BooleanUtils.toStringOnOff(false) = "off" |
| * </pre> |
| * |
| * @param bool the Boolean to check |
| * @return <code>'on'</code>, <code>'off'</code>, |
| * or <code>null</code> |
| */ |
| public static String toStringOnOff(boolean bool) { |
| return toString(bool, "on", "off"); |
| } |
| |
| /** |
| * <p>Converts a boolean to a String returning <code>'yes'</code> |
| * or <code>'no'</code>.</p> |
| * |
| * <pre> |
| * BooleanUtils.toStringYesNo(true) = "yes" |
| * BooleanUtils.toStringYesNo(false) = "no" |
| * </pre> |
| * |
| * @param bool the Boolean to check |
| * @return <code>'yes'</code>, <code>'no'</code>, |
| * or <code>null</code> |
| */ |
| public static String toStringYesNo(boolean bool) { |
| return toString(bool, "yes", "no"); |
| } |
| |
| /** |
| * <p>Converts a boolean to a String returning one of the input Strings.</p> |
| * |
| * <pre> |
| * BooleanUtils.toString(true, "true", "false") = "true" |
| * BooleanUtils.toString(false, "true", "false") = "false" |
| * </pre> |
| * |
| * @param bool the Boolean to check |
| * @param trueString the String to return if <code>true</code>, |
| * may be <code>null</code> |
| * @param falseString the String to return if <code>false</code>, |
| * may be <code>null</code> |
| * @return one of the two input Strings |
| */ |
| public static String toString(boolean bool, String trueString, String falseString) { |
| return bool ? trueString : falseString; |
| } |
| |
| // xor methods |
| // ---------------------------------------------------------------------- |
| /** |
| * <p>Performs an xor on a set of booleans.</p> |
| * |
| * <pre> |
| * BooleanUtils.xor(new boolean[] { true, true }) = false |
| * BooleanUtils.xor(new boolean[] { false, false }) = false |
| * BooleanUtils.xor(new boolean[] { true, false }) = true |
| * </pre> |
| * |
| * @param array an array of <code>boolean<code>s |
| * @return <code>true</code> if the xor is successful. |
| * @throws IllegalArgumentException if <code>array</code> is <code>null</code> |
| * @throws IllegalArgumentException if <code>array</code> is empty. |
| */ |
| public static boolean xor(boolean[] array) { |
| // Validates input |
| if (array == null) { |
| throw new IllegalArgumentException("The Array must not be null"); |
| } else if (array.length == 0) { |
| throw new IllegalArgumentException("Array is empty"); |
| } |
| |
| // Loops through array, comparing each item |
| int trueCount = 0; |
| for (int i = 0; i < array.length; i++) { |
| // If item is true, and trueCount is < 1, increments count |
| // Else, xor fails |
| if (array[i]) { |
| if (trueCount < 1) { |
| trueCount++; |
| } else { |
| return false; |
| } |
| } |
| } |
| |
| // Returns true if there was exactly 1 true item |
| return trueCount == 1; |
| } |
| |
| /** |
| * <p>Performs an xor on an array of Booleans.</p> |
| * |
| * <pre> |
| * 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 |
| * </pre> |
| * |
| * @param array an array of <code>Boolean<code>s |
| * @return <code>true</code> if the xor is successful. |
| * @throws IllegalArgumentException if <code>array</code> is <code>null</code> |
| * @throws IllegalArgumentException if <code>array</code> is empty. |
| * @throws IllegalArgumentException if <code>array</code> contains a <code>null</code> |
| */ |
| public static Boolean xor(Boolean[] array) { |
| if (array == null) { |
| throw new IllegalArgumentException("The Array must not be null"); |
| } else 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; |
| } |
| |
| } |
