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package com.fasterxml.jackson.annotation;

/**
 * Optional Boolean value ("nullean"). Needed just because Java annotations
 * can not take 'null' as a value (even as default), so there is no
 * way to distinguish between explicit `true` and `false`, and lack of
 * choice (related: annotations are limited to primitives, so
 * {@link java.lang.Boolean} not allowed as solution).
 *

* Note: although use of `true` and `false` would be more convenient, they * can not be chosen since they are Java keyword and compiler won't allow * the choice. And since enum naming convention suggests all-upper-case, * that is what is done here. * * @since 2.6 */ public enum OptBoolean { /** * Value that indicates that the annotation property is explicitly defined to * be enabled, or true. */ TRUE, /** * Value that indicates that the annotation property is explicitly defined to * be disabled, or false. */ FALSE, /** * Value that indicates that the annotation property does NOT have an explicit * definition of enabled/disabled (or true/false); instead, a higher-level * configuration value is used; or lacking higher-level global setting, * default. */ DEFAULT; public Boolean asBoolean() { if (this == DEFAULT) return null; return (this == TRUE) ? Boolean.TRUE : Boolean.FALSE; } public boolean asPrimitive() { return (this == TRUE); } public static OptBoolean fromBoolean(Boolean b) { if (b == null) { return DEFAULT; } return b.booleanValue() ? TRUE : FALSE; } public static boolean equals(Boolean b1, Boolean b2) { if (b1 == null) { return (b2 == null); } return b1.equals(b2); } }





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