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stringHashCode UDF: Returns a consistent string hashCode 32bit integer regardless of how Java may have hashCode() configured
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| <cfscript> | |
| /* stringHashCode UDF: Returns a consistent string hashCode 32bit integer regardless of how Java may have hashCode() configured | |
| 2025-02-01 | |
| Author: James Moberg http://sunstarmedia.com @sunstarmedia | |
| GIST: https://gist.github.com/JamoCA/111cb4ef9855c1bdbfc4a8409b1d8db9 | |
| Blog: https://dev.to/gamesover/java-hashcode-identity-crisis-307a | |
| X/Twitter: https://x.com/gamesover/status/1886495587320901725 | |
| LinkedIn: https://www.linkedin.com/posts/jamesmoberg_coldfusion-activity-7292261743089590274-HTPA | |
| */ | |
| numeric function stringHashCode(inputString) hint="Returns a consistent 32bit integer regardless of how Java may have hashCode() configured" { | |
| if (isnull(arguments.inputString) || !issimplevalue(arguments.inputString) || !len(arguments.inputString)) { | |
| return 0; | |
| } | |
| local.bigInt = createobject("java", "java.math.BigInteger"); | |
| local.multiplier = local.bigInt.valueOf(31); | |
| local.hash = local.bigInt.valueOf(0); | |
| for (local.char in listtoarray(arguments.inputString, "")) { | |
| local.hash = local.hash.multiply(local.multiplier).add(local.bigInt.valueOf(asc(local.char))); | |
| } | |
| return local.hash.intValue(); | |
| } | |
| </cfscript> |
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