microsoft-azure-storage/src/com/microsoft/azure/storage/AccessCondition.java
public static AccessCondition generateIfNoneMatchCondition(final String etag) {
        AccessCondition retCondition = new AccessCondition();
        retCondition.setIfNoneMatch(etag);
        return retCondition;
    }
public static AccessCondition generateIfNoneMatchCondition(final String etag) {
        AccessCondition retCondition = new AccessCondition();
        retCondition.setIfNoneMatch(etag);
        return retCondition;
    }
Returns an access condition such that an operation will be performed only if the resource's ETag value does not
match the specified ETag value.
<p>
Setting this access condition modifies the request to include the HTTP <i>If-None-Match</i> conditional header.
If this access condition is set, the operation is performed only if the ETag of the resource does not match the
specified ETag.
<p>
For more information, see <a href= 'http://go.microsoft.com/fwlink/?LinkID=224642'>Specifying Conditional Headers
for Blob Service Operations</a>.

@param etag
A <code>String</code> that represents the ETag value to check.

@return An <code>AccessCondition</code> object that represents the <i>If-None-Match</i> condition.