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add trimToNull method on GrailsStringUtils #13807

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add trimToNull method on GrailsStringUtils #13807

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26 changes: 25 additions & 1 deletion grails-core/src/main/groovy/grails/util/GrailsStringUtils.groovy
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
/*
* Copyright 2012 the original author or authors.
* Copyright 2012-2024 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
Expand Down Expand Up @@ -191,4 +191,28 @@ abstract class GrailsStringUtils extends StringUtils{
stripFilenameExtension( getFilename(path) )
}

/**
* Removes all space from both ends of this String returning
* {@code null} if the String is empty ("") after the trim
* or if it is {@code null}.
*
* <p>The String is trimmed using {@link String#trim()}.
*
* <pre>
* GrailsStringUtils.trimToNull(null) = null
* GrailsStringUtils.trimToNull("") = null
* GrailsStringUtils.trimToNull(" ") = null
* GrailsStringUtils.trimToNull("xyz") = "xyz"
* GrailsStringUtils.trimToNull(" xyz ") = "xyz"
* </pre>
*
* @param str the String to be trimmed, may be null
* @return the trimmed String,
* {@code null} if only containing space, empty or null String input
* @since 7.0.0
*/
static String trimToNull(String str) {
String trimmed = str?.trim()
return hasLength(trimmed) ? trimmed : null
}
}
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