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I have been able to piece together some code that determines object name based on record ID without any hard-coding or SOQL. It works with both custom and standard objects but it is very slow, I'm guessing due to loading so much schema data and a lot of looping.

I am looking for a way to speed this function up, potentially by limiting the object names searched or the amount of data being sorted through.

Here is the entire (working, but slow) function:

// Get sObject type by record ID

public static String getObjName(String recordId) {

    // Get record prefix

    String recordPrefix = recordId.substring(0, 3);



    // Get global "describe"

    Map<String, Schema.SObjectType> gd = Schema.getGlobalDescribe();



    // Loop through all objects to find match for record ID prefix

    for (Schema.SObjectType otype : gd.values()) {

        Schema.DescribeSObjectResult r = otype.getDescribe();

        String prefix = r.getKeyPrefix();



        // Found match!

        if (prefix != null && prefix.equals(recordPrefix)) return r.getName();

    }



    return '';

}

Any ideas?

The Id class already contains an instance method to do exactly what you wish, named getSObjectType. The entire body of your method can be simplified to the below:

return (recordId == null) ? '' : String.valueOf(recordId.getSObjectType());