Get object sharing setting on Organization-Wide Defaults

Question

Is it possible to know, via apex code, if a certain object is Private, Public Read-Only or Public Read/Write?

Answer 1

For the Standard object, you can use Organization object to achieve this, query like,

Organization org = [Select Id, DefaultAccountAccess, DefaultContactAccess, DefaultLeadAccess, DefaultOpportunityAccess from Organization];

System.debug(org);

Query this object to obtain information about an organization's settings. Only one organization object exists per organization.

for the details, see the doc, http://www.salesforce.com/us/developer/docs/api/Content/sforce_api_objects_organization.htm

Answer 2

Guess this should help you :

SELECT Id,ParentId,UserOrGroupId,RowCause,AccessLevel FROM ObjectApiName__Share

Answer 3

Another way to test for sharing of custom objects is to check the global describe Map.

if(Schema.getGlobalDescribe().containsKey('MyCustomObject__Share')) {
    //Share object exists, therefore custom object is private or public read only
} else {
    //Share does not exist custom object is public read write
}

As you have already discovered, this is only for custom objects, @JiaHu's answer explains how to get the sharing level of a standard object.