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package external.org.apache.commons.lang3;

public class BooleanUtils {

    /**
     * 

Converts a String to a Boolean.

* *

{@code 'true'}, {@code 'on'}, {@code 'y'}, {@code 't'} or {@code 'yes'} * (case insensitive) will return {@code true}. * {@code 'false'}, {@code 'off'}, {@code 'n'}, {@code 'f'} 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.

* *
     *   // 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("blue")  = null
     *   BooleanUtils.toBooleanObject("true ") = null // trailing space (too long)
     *   BooleanUtils.toBooleanObject("ono")   = null // does not match on or no
     * 
* * @param str the String to check; upper and lower case are treated as the same * @return the Boolean value of the string, {@code null} if no match or {@code null} input */ public static Boolean toBooleanObject(final 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: { final 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: { final char ch0 = str.charAt(0); final 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: { final char ch0 = str.charAt(0); final char ch1 = str.charAt(1); final 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: { final char ch0 = str.charAt(0); final char ch1 = str.charAt(1); final char ch2 = str.charAt(2); final 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: { final char ch0 = str.charAt(0); final char ch1 = str.charAt(1); final char ch2 = str.charAt(2); final char ch3 = str.charAt(3); final 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; } default: break; } return null; } /** *

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

* *

{@code 'true'}, {@code 'on'}, {@code 'y'}, {@code 't'} 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', '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.toBooleanObject("y") = true
     *   BooleanUtils.toBooleanObject("n") = false
     *   BooleanUtils.toBooleanObject("t") = true
     *   BooleanUtils.toBooleanObject("f") = 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(final String str) { return toBooleanObject(str) == Boolean.TRUE; } }




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