===== 6.12 Export Component =====

The Export Component lists all static elements in this package that may be imported by classes in other packages. Instance fields and virtual methods are not represented in the Export Component. 

If this CAP file does not include an Applet Component ([[6.5_Applet Component| Section 6.5, Applet Component]]), the Export Component contains an entry for each public class and public interface defined in this package. Furthermore, for each public class there is an entry for each public or protected static field defined in that class, for each public or protected static method defined in that class, and for each public or protected constructor defined in that class. Final static fields of primitive types (compile-time constants) are not included. 

If this CAP file includes an Applet Component ([[6.5_Applet Component| Section 6.5, Applet Component]]), the Export Component includes entries only for all public interfaces that are shareable.<SUP>[9]</SUP> An interface is shareable if and only if it is the **javacard.framework.Shareable** interface or implements (directly or indirectly) that interface. 

Elements in the Export Component reference elements in the Class Component ([[6.8_Class Component| Section 6.8, Class Component]]), Method Component ([[6.9_Method Component| Section 6.9, Method Component]]), and Static Field Component ([[6.10_Static Field Component| Section 6.10, Static Field Component]]). No other component in this CAP file references the Export Component. 

The Export Component is represented by the following structure: 

The items of the export_component structure are as follows: 

**tag** 

The **tag** item has the value **COMPONENT_Export** (10). 

**size** 

The ******size****** item indicates the number of bytes in the **export_component** structure, excluding the **tag** and ******size****** items. The value of the ******size****** item must be greater than zero. 

**class_count** 

The ****class_count**** item represents the number of entries in the **class_exports** table. The value of the ****class_count**** item must be greater than zero. 

**class_exports[]** 

The **class_exports** item represents a variable-length table of **class_export_info** structures. If this package is a library package, the table contains an entry for each of the public classes and public interfaces defined in this package. If this package is an applet package, the table contains an entry for each of the public shareable interfaces defined in this package. 

An index into the table to a particular class or interface is equal to the token value of that class or interface ([[4.3.7.2_Classes and Interfaces| Section 4.3.7.2, Classes and Interfaces]]). The token value is published in the Export file ([[5.7_Classes and Interfaces| Section 5.7, Classes and Interfaces]]) of this package. 

The items in the **class_export_info** structure are: 

**  class_offset** 

The **class_offset** item represents a byte offset into the info item of the Class Component ([[6.8_Class Component| Section 6.8, Class Component]]). If this package defines a library package, the item at that offset must be either an ****interface_info**** or a ****class_info**** structure. The ****interface_info**** or ****class_info**** structure at that offset must represent the exported class or interface. 

If this package defines an applet package, the item at the **class_offset** in the info item of the Class Component must be an ******interface_info****** structure. The ******interface_info****** structure at that offset must represent the exported, shareable interface. In particular, the **ACC_SHAREABLE** flag of the ******interface_info****** structure must be equal to 1. 

**  static_field_count** 

The **static_field_count** item represents the number of elements in the **static_field_offsets** array. This value indicates the number of public and protected static fields defined in this class, excluding final static fields of primitive types. 

If the **class_offset** item represents an offset to an **interface_info** structure, the value of the **static_field_count** item must be zero. 

**  static_method_count** 

The **static_method_count** item represents the number of elements in the static_method_offsets array. This value indicates the number of public and protected static methods and constructors defined in this class. 

If the **class_offset** item represents an offset to an **interface_info** structure, the value of the **static_method_count** item must be zero. 

**  static_field_offsets[]** 

The **static_field_offsets** item represents an array of 2-byte offsets into the static field image defined by the Static Field Component ([[6.10_Static Field Component| Section 6.10, Static Field Component]]). Each offset must be to the beginning of the representation of the exported static field. 

An index into the **static_field_offsets** array must be equal to the token value of the field represented by that entry. The token value is published in the Export file ([[5.9_Methods| Section 5.9, Methods]]) of this package. 

**  static_method_offsets[]** 

The **static_method_offsets** item represents a table of 2-byte offsets into the info item of the Method Component ([[6.9_Method Component| Section 6.9, Method Component]]). Each offset must be to the beginning of a ****method_info**** structure. The ****method_info**** structure must represent the exported static method or constructor. 

An index into the **static_method_offsets** array must be equal to the token value of the method represented by that entry.