45 lines
1.0 KiB
Java
45 lines
1.0 KiB
Java
package javax.annotation;
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import java.lang.annotation.Documented;
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import java.lang.annotation.Retention;
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import java.lang.annotation.RetentionPolicy;
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import java.util.regex.Pattern;
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import java.util.regex.PatternSyntaxException;
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import javax.annotation.meta.TypeQualifierNickname;
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import javax.annotation.meta.TypeQualifierValidator;
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import javax.annotation.meta.When;
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/**
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* This qualifier is used to denote String values that should be a Regular
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* expression.
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* <p>
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* When this annotation is applied to a method it applies to the method return
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* value.
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*/
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@Documented
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@Syntax("RegEx")
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@TypeQualifierNickname
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@Retention(RetentionPolicy.RUNTIME)
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public @interface RegEx {
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When when() default When.ALWAYS;
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static class Checker implements TypeQualifierValidator<RegEx> {
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public When forConstantValue(RegEx annotation, Object value) {
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if (!(value instanceof String))
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return When.NEVER;
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try {
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Pattern.compile((String) value);
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} catch (PatternSyntaxException e) {
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return When.NEVER;
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}
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return When.ALWAYS;
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}
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}
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}
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