question: private static int checkPartPosition ( PduPart part ) { assert ( null != part ) ; if ( ( null == mTypeParam ) && ( null == mStartParam ) ) { return THE_LAST_PART ; } if ( null != mStartParam ) { byte [ ] contentId = part . getContentId ( ) ; if ( null != contentId ) { if ( true == Arrays . equals ( mStartParam , contentId ) ) { return THE_FIRST_PART ; } } } if ( null != mTypeParam ) { byte [ ] contentType = part . getContentType ( ) ; if ( null != contentType ) { if ( true == Arrays . equals ( mTypeParam , contentType ) ) { return THE_FIRST_PART ; } } } return THE_LAST_PART ; }
target:  Check the position of a specified part.