Package org.apache.tools.ant.taskdefs.optional.extension

Class Extension

java.lang.Object
org.apache.tools.ant.taskdefs.optional.extension.Extension
public final class Extension extends Object

Utility class that represents either an available "Optional Package" (formerly known as "Standard Extension") as described in the manifest of a JAR file, or the requirement for such an optional package.

For more information about optional packages, see the document Optional Package Versioning in the documentation bundle for your Java2 Standard Edition package, in file guide/extensions/versioning.html.

  • Field Details

    • EXTENSION_LIST

      public static final Attributes.Name EXTENSION_LIST
      Manifest Attribute Name object for EXTENSION_LIST.

    • OPTIONAL_EXTENSION_LIST

      public static final Attributes.Name OPTIONAL_EXTENSION_LIST
      Name object for Optional-Extension-List manifest attribute used for declaring optional dependencies on installed extensions. Note that the dependencies declared by this method are not required for the library to operate but if present will be used. It is NOT part of the official "Optional Package" specification.
      See Also:

    • EXTENSION_NAME

      public static final Attributes.Name EXTENSION_NAME
      Manifest Attribute Name object for EXTENSION_NAME.

    • SPECIFICATION_VERSION

      public static final Attributes.Name SPECIFICATION_VERSION
      Manifest Attribute Name object for SPECIFICATION_VERSION.

    • SPECIFICATION_VENDOR

      public static final Attributes.Name SPECIFICATION_VENDOR
      Manifest Attribute Name object for SPECIFICATION_VENDOR.

    • IMPLEMENTATION_VERSION

      public static final Attributes.Name IMPLEMENTATION_VERSION
      Manifest Attribute Name object for IMPLEMENTATION_VERSION.

    • IMPLEMENTATION_VENDOR

      public static final Attributes.Name IMPLEMENTATION_VENDOR
      Manifest Attribute Name object for IMPLEMENTATION_VENDOR.

    • IMPLEMENTATION_URL

      public static final Attributes.Name IMPLEMENTATION_URL
      Manifest Attribute Name object for IMPLEMENTATION_URL.

    • IMPLEMENTATION_VENDOR_ID

      public static final Attributes.Name IMPLEMENTATION_VENDOR_ID
      Manifest Attribute Name object for IMPLEMENTATION_VENDOR_ID.

    • COMPATIBLE

      public static final Compatibility COMPATIBLE
      Enum indicating that extension is compatible with other extension.

    • REQUIRE_SPECIFICATION_UPGRADE

      public static final Compatibility REQUIRE_SPECIFICATION_UPGRADE
      Enum indicating that extension requires an upgrade of specification to be compatible with other extension.

    • REQUIRE_VENDOR_SWITCH

      public static final Compatibility REQUIRE_VENDOR_SWITCH
      Enum indicating that extension requires a vendor switch to be compatible with other extension.

    • REQUIRE_IMPLEMENTATION_UPGRADE

      public static final Compatibility REQUIRE_IMPLEMENTATION_UPGRADE
      Enum indicating that extension requires an upgrade of implementation to be compatible with other extension.

    • INCOMPATIBLE

      public static final Compatibility INCOMPATIBLE
      Enum indicating that extension is incompatible with other extension in ways other than other enums indicate). For example the other extension may have a different ID.

  • Constructor Details

    • Extension

      public Extension(String extensionName, String specificationVersion, String specificationVendor, String implementationVersion, String implementationVendor, String implementationVendorId, String implementationURL)
      The constructor to create Extension object. Note that every component is allowed to be specified but only the extensionName is mandatory.
      Parameters:
      extensionName - the name of extension.
      specificationVersion - the specification Version of extension.
      specificationVendor - the specification Vendor of extension.
      implementationVersion - the implementation Version of extension.
      implementationVendor - the implementation Vendor of extension.
      implementationVendorId - the implementation VendorId of extension.
      implementationURL - the implementation URL of extension.

  • Method Details

    • getAvailable

      public static Extension[] getAvailable(Manifest manifest)
      Return an array of Extension objects representing optional packages that are available in the JAR file associated with the specified Manifest. If there are no such optional packages, a zero-length array is returned.
      Parameters:
      manifest - Manifest to be parsed
      Returns:
      the "available" extensions in specified manifest

    • getRequired

      public static Extension[] getRequired(Manifest manifest)
      Return the set of Extension objects representing optional packages that are required by the application contained in the JAR file associated with the specified Manifest. If there are no such optional packages, a zero-length list is returned.
      Parameters:
      manifest - Manifest to be parsed
      Returns:
      the dependencies that are specified in manifest

    • getOptions

      public static Extension[] getOptions(Manifest manifest)
      Return the set of Extension objects representing "Optional Packages" that the application declares they will use if present. If there are no such optional packages, a zero-length list is returned.
      Parameters:
      manifest - Manifest to be parsed
      Returns:
      the optional dependencies that are specified in manifest

    • addExtension

      public static void addExtension(Extension extension, Attributes attributes)
      Add Extension to the specified manifest Attributes.
      Parameters:
      extension - the extension
      attributes - the attributes of manifest to add to

    • addExtension

      public static void addExtension(Extension extension, String prefix, Attributes attributes)
      Add Extension to the specified manifest Attributes. Use the specified prefix so that dependencies can added with a prefix such as "java3d-" etc.
      Parameters:
      extension - the extension
      prefix - the name to prefix to extension
      attributes - the attributes of manifest to add to

    • getExtensionName

      public String getExtensionName()
      Get the name of the extension.
      Returns:
      the name of the extension

    • getSpecificationVendor

      public String getSpecificationVendor()
      Get the vendor of the extensions specification.
      Returns:
      the vendor of the extensions specification.

    • getSpecificationVersion

      public DeweyDecimal getSpecificationVersion()
      Get the version of the extensions specification.
      Returns:
      the version of the extensions specification.

    • getImplementationURL

      public String getImplementationURL()
      Get the url of the extensions implementation.
      Returns:
      the url of the extensions implementation.

    • getImplementationVendor

      public String getImplementationVendor()
      Get the vendor of the extensions implementation.
      Returns:
      the vendor of the extensions implementation.

    • getImplementationVendorID

      public String getImplementationVendorID()
      Get the vendorID of the extensions implementation.
      Returns:
      the vendorID of the extensions implementation.

    • getImplementationVersion

      public DeweyDecimal getImplementationVersion()
      Get the version of the extensions implementation.
      Returns:
      the version of the extensions implementation.

    • getCompatibilityWith

      public Compatibility getCompatibilityWith(Extension required)
      Return a Compatibility enum indicating the relationship of this Extension with the specified Extension.
      Parameters:
      required - Description of the required optional package
      Returns:
      the enum indicating the compatibility (or lack thereof) of specified extension

    • isCompatibleWith

      public boolean isCompatibleWith(Extension required)
      Return true if the specified Extension (which represents an optional package required by an application) is satisfied by this Extension (which represents an optional package that is already installed. Otherwise, return false.
      Parameters:
      required - Description of the required optional package
      Returns:
      true if the specified extension is compatible with this extension

    • toString

      public String toString()
      Return a String representation of this object.
      Overrides:
      toString in class Object
      Returns:
      string representation of object.