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.
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
* Installed extension dependency
*/
public static final Attributes.Name OPTIONAL_EXTENSION_LIST
= new Attributes.Name("Optional-Extension-List");
/**
* Manifest Attribute Name object for EXTENSION_NAME.
* @see Attributes.Name#EXTENSION_NAME
*/
public static final Attributes.Name EXTENSION_NAME =
new Attributes.Name("Extension-Name");
/**
* Manifest Attribute Name object for SPECIFICATION_VERSION.
* @see Attributes.Name#SPECIFICATION_VERSION
*/
public static final Attributes.Name SPECIFICATION_VERSION
= Attributes.Name.SPECIFICATION_VERSION;
/**
* Manifest Attribute Name object for SPECIFICATION_VENDOR.
* @see Attributes.Name#SPECIFICATION_VENDOR
*/
public static final Attributes.Name SPECIFICATION_VENDOR
= Attributes.Name.SPECIFICATION_VENDOR;
/**
* Manifest Attribute Name object for IMPLEMENTATION_VERSION.
* @see Attributes.Name#IMPLEMENTATION_VERSION
*/
public static final Attributes.Name IMPLEMENTATION_VERSION
= Attributes.Name.IMPLEMENTATION_VERSION;
/**
* Manifest Attribute Name object for IMPLEMENTATION_VENDOR.
* @see Attributes.Name#IMPLEMENTATION_VENDOR
*/
public static final Attributes.Name IMPLEMENTATION_VENDOR
= Attributes.Name.IMPLEMENTATION_VENDOR;
/**
* Manifest Attribute Name object for IMPLEMENTATION_URL.
* @see Attributes.Name#IMPLEMENTATION_URL
*/
public static final Attributes.Name IMPLEMENTATION_URL
= new Attributes.Name("Implementation-URL");
/**
* Manifest Attribute Name object for IMPLEMENTATION_VENDOR_ID.
* @see Attributes.Name#IMPLEMENTATION_VENDOR_ID
*/
public static final Attributes.Name IMPLEMENTATION_VENDOR_ID
= new Attributes.Name("Implementation-Vendor-Id");
/**
* Enum indicating that extension is compatible with other extension.
*/
public static final Compatibility COMPATIBLE
= new Compatibility("COMPATIBLE");
/**
* Enum indicating that extension requires an upgrade
* of specification to be compatible with other extension.
*/
public static final Compatibility REQUIRE_SPECIFICATION_UPGRADE
= new Compatibility("REQUIRE_SPECIFICATION_UPGRADE");
/**
* Enum indicating that extension requires a vendor
* switch to be compatible with other extension.
*/
public static final Compatibility REQUIRE_VENDOR_SWITCH
= new Compatibility("REQUIRE_VENDOR_SWITCH");
/**
* Enum indicating that extension requires an upgrade
* of implementation to be compatible with other extension.
*/
public static final Compatibility REQUIRE_IMPLEMENTATION_UPGRADE
= new Compatibility("REQUIRE_IMPLEMENTATION_UPGRADE");
/**
* 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.
*/
public static final Compatibility INCOMPATIBLE
= new Compatibility("INCOMPATIBLE");
/**
* The name of the optional package being made available, or required.
*/
private String extensionName;
/**
* The version number (dotted decimal notation) of the specification
* to which this optional package conforms.
*/
private DeweyDecimal specificationVersion;
/**
* The name of the company or organization that originated the
* specification to which this optional package conforms.
*/
private String specificationVendor;
/**
* The unique identifier of the company that produced the optional
* package contained in this JAR file.
*/
private String implementationVendorID;
/**
* The name of the company or organization that produced this
* implementation of this optional package.
*/
private String implementationVendor;
/**
* The version number (dotted decimal notation) for this implementation
* of the optional package.
*/
private DeweyDecimal implementationVersion;
/**
* The URL from which the most recent version of this optional package
* can be obtained if it is not already installed.
*/
private String implementationURL;
/**
* 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.
*
* @param manifest Manifest to be parsed
* @return the "available" extensions in specified manifest
*/
public static Extension[] getAvailable(final Manifest manifest) {
if (null == manifest) {
return new Extension[ 0 ];
}
final ArrayList results = new ArrayList();
final Attributes mainAttributes = manifest.getMainAttributes();
if (null != mainAttributes) {
final Extension extension = getExtension("", mainAttributes);
if (null != extension) {
results.add(extension);
}
}
final Map entries = manifest.getEntries();
final Iterator keys = entries.keySet().iterator();
while (keys.hasNext()) {
final String key = (String) keys.next();
final Attributes attributes = (Attributes) entries.get(key);
final Extension extension = getExtension("", attributes);
if (null != extension) {
results.add(extension);
}
}
return (Extension[]) results.toArray(new Extension[0]);
}
/**
* 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.
*
* @param manifest Manifest to be parsed
* @return the dependencies that are specified in manifes
*/
public static Extension[] getRequired(final Manifest manifest) {
return getListed(manifest, Attributes.Name.EXTENSION_LIST);
}
/**
* 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.
*
* @param manifest Manifest to be parsed
* @return the optional dependencies that are specified in manifest
*/
public static Extension[] getOptions(final Manifest manifest) {
return getListed(manifest, OPTIONAL_EXTENSION_LIST);
}
/**
* Add Extension to the specified manifest Attributes.
*
* @param attributes the attributes of manifest to add to
* @param extension the extension
*/
public static void addExtension(final Extension extension,
final Attributes attributes) {
addExtension(extension, "", attributes);
}
/**
* Add Extension to the specified manifest Attributes.
* Use the specified prefix so that dependencies can added
* with a prefix such as "java3d-" etc.
*
* @param attributes the attributes of manifest to add to
* @param extension the extension
* @param prefix the name to prefix to extension
*/
public static void addExtension(final Extension extension,
final String prefix,
final Attributes attributes) {
attributes.putValue(prefix + EXTENSION_NAME,
extension.getExtensionName());
final String specificationVendor = extension.getSpecificationVendor();
if (null != specificationVendor) {
attributes.putValue(prefix + SPECIFICATION_VENDOR,
specificationVendor);
}
final DeweyDecimal specificationVersion
= extension.getSpecificationVersion();
if (null != specificationVersion) {
attributes.putValue(prefix + SPECIFICATION_VERSION,
specificationVersion.toString());
}
final String implementationVendorID
= extension.getImplementationVendorID();
if (null != implementationVendorID) {
attributes.putValue(prefix + IMPLEMENTATION_VENDOR_ID,
implementationVendorID);
}
final String implementationVendor = extension.getImplementationVendor();
if (null != implementationVendor) {
attributes.putValue(prefix + IMPLEMENTATION_VENDOR,
implementationVendor);
}
final DeweyDecimal implementationVersion
= extension.getImplementationVersion();
if (null != implementationVersion) {
attributes.putValue(prefix + IMPLEMENTATION_VERSION,
implementationVersion.toString());
}
final String implementationURL = extension.getImplementationURL();
if (null != implementationURL) {
attributes.putValue(prefix + IMPLEMENTATION_URL,
implementationURL);
}
}
/**
* The constructor to create Extension object.
* Note that every component is allowed to be specified
* but only the extensionName is mandatory.
*
* @param extensionName the name of extension.
* @param specificationVersion the specification Version of extension.
* @param specificationVendor the specification Vendor of extension.
* @param implementationVersion the implementation Version of extension.
* @param implementationVendor the implementation Vendor of extension.
* @param implementationVendorId the implementation VendorId of extension.
* @param implementationURL the implementation URL of extension.
*/
public Extension(final String extensionName,
final String specificationVersion,
final String specificationVendor,
final String implementationVersion,
final String implementationVendor,
final String implementationVendorId,
final String implementationURL) {
this.extensionName = extensionName;
this.specificationVendor = specificationVendor;
if (null != specificationVersion) {
try {
this.specificationVersion
= new DeweyDecimal(specificationVersion);
} catch (final NumberFormatException nfe) {
final String error = "Bad specification version format '"
+ specificationVersion + "' in '" + extensionName
+ "'. (Reason: " + nfe + ")";
throw new IllegalArgumentException(error);
}
}
this.implementationURL = implementationURL;
this.implementationVendor = implementationVendor;
this.implementationVendorID = implementationVendorId;
if (null != implementationVersion) {
try {
this.implementationVersion
= new DeweyDecimal(implementationVersion);
} catch (final NumberFormatException nfe) {
final String error = "Bad implementation version format '"
+ implementationVersion + "' in '" + extensionName
+ "'. (Reason: " + nfe + ")";
throw new IllegalArgumentException(error);
}
}
if (null == this.extensionName) {
throw new NullPointerException("extensionName property is null");
}
}
/**
* Get the name of the extension.
*
* @return the name of the extension
*/
public String getExtensionName() {
return extensionName;
}
/**
* Get the vendor of the extensions specification.
*
* @return the vendor of the extensions specification.
*/
public String getSpecificationVendor() {
return specificationVendor;
}
/**
* Get the version of the extensions specification.
*
* @return the version of the extensions specification.
*/
public DeweyDecimal getSpecificationVersion() {
return specificationVersion;
}
/**
* Get the url of the extensions implementation.
*
* @return the url of the extensions implementation.
*/
public String getImplementationURL() {
return implementationURL;
}
/**
* Get the vendor of the extensions implementation.
*
* @return the vendor of the extensions implementation.
*/
public String getImplementationVendor() {
return implementationVendor;
}
/**
* Get the vendorID of the extensions implementation.
*
* @return the vendorID of the extensions implementation.
*/
public String getImplementationVendorID() {
return implementationVendorID;
}
/**
* Get the version of the extensions implementation.
*
* @return the version of the extensions implementation.
*/
public DeweyDecimal getImplementationVersion() {
return implementationVersion;
}
/**
* Return a Compatibility enum indicating the relationship of this
* Extension with the specified Extension.
*
* @param required Description of the required optional package
* @return the enum indicating the compatibility (or lack thereof)
* of specifed extension
*/
public Compatibility getCompatibilityWith(final Extension required) {
// Extension Name must match
if (!extensionName.equals(required.getExtensionName())) {
return INCOMPATIBLE;
}
// Available specification version must be >= required
final DeweyDecimal specificationVersion
= required.getSpecificationVersion();
if (null != specificationVersion) {
if (null == specificationVersion
|| !isCompatible(specificationVersion, specificationVersion)) {
return REQUIRE_SPECIFICATION_UPGRADE;
}
}
// Implementation Vendor ID must match
final String implementationVendorId
= required.getImplementationVendorID();
if (null != implementationVendorId) {
if (null == implementationVendorID
|| !implementationVendorID.equals(implementationVendorId)) {
return REQUIRE_VENDOR_SWITCH;
}
}
// Implementation version must be >= required
final DeweyDecimal implementationVersion
= required.getImplementationVersion();
if (null != implementationVersion) {
if (null == implementationVersion
|| !isCompatible(implementationVersion, implementationVersion)) {
return REQUIRE_IMPLEMENTATION_UPGRADE;
}
}
// This available optional package satisfies the requirements
return COMPATIBLE;
}
/**
* 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.
*
* @param required Description of the required optional package
* @return true if the specified extension is compatible with this extension
*/
public boolean isCompatibleWith(final Extension required) {
return (COMPATIBLE == getCompatibilityWith(required));
}
/**
* Return a String representation of this object.
*
* @return string representation of object.
*/
public String toString() {
final String lineSeparator = System.getProperty("line.separator");
final String brace = ": ";
final StringBuffer sb = new StringBuffer(EXTENSION_NAME.toString());
sb.append(brace);
sb.append(extensionName);
sb.append(lineSeparator);
if (null != specificationVersion) {
sb.append(SPECIFICATION_VERSION);
sb.append(brace);
sb.append(specificationVersion);
sb.append(lineSeparator);
}
if (null != specificationVendor) {
sb.append(SPECIFICATION_VENDOR);
sb.append(brace);
sb.append(specificationVendor);
sb.append(lineSeparator);
}
if (null != implementationVersion) {
sb.append(IMPLEMENTATION_VERSION);
sb.append(brace);
sb.append(implementationVersion);
sb.append(lineSeparator);
}
if (null != implementationVendorID) {
sb.append(IMPLEMENTATION_VENDOR_ID);
sb.append(brace);
sb.append(implementationVendorID);
sb.append(lineSeparator);
}
if (null != implementationVendor) {
sb.append(IMPLEMENTATION_VENDOR);
sb.append(brace);
sb.append(implementationVendor);
sb.append(lineSeparator);
}
if (null != implementationURL) {
sb.append(IMPLEMENTATION_URL);
sb.append(brace);
sb.append(implementationURL);
sb.append(lineSeparator);
}
return sb.toString();
}
/**
* Return true if the first version number is greater than
* or equal to the second; otherwise return false.
*
* @param first First version number (dotted decimal)
* @param second Second version number (dotted decimal)
*/
private boolean isCompatible(final DeweyDecimal first,
final DeweyDecimal second) {
return first.isGreaterThanOrEqual(second);
}
/**
* Retrieve all the extensions listed under a particular key
* (Usually EXTENSION_LIST or OPTIONAL_EXTENSION_LIST).
*
* @param manifest the manifest to extract extensions from
* @param listKey the key used to get list (Usually
* EXTENSION_LIST or OPTIONAL_EXTENSION_LIST)
* @return the list of listed extensions
*/
private static Extension[] getListed(final Manifest manifest,
final Attributes.Name listKey) {
final ArrayList results = new ArrayList();
final Attributes mainAttributes = manifest.getMainAttributes();
if (null != mainAttributes) {
getExtension(mainAttributes, results, listKey);
}
final Map entries = manifest.getEntries();
final Iterator keys = entries.keySet().iterator();
while (keys.hasNext()) {
final String key = (String) keys.next();
final Attributes attributes = (Attributes) entries.get(key);
getExtension(attributes, results, listKey);
}
return (Extension[]) results.toArray(new Extension[ 0 ]);
}
/**
* Add required optional packages defined in the specified
* attributes entry, if any.
*
* @param attributes Attributes to be parsed
* @param required list to add required optional packages to
* @param listKey the key to use to lookup list, usually EXTENSION_LIST
* or OPTIONAL_EXTENSION_LIST
*/
private static void getExtension(final Attributes attributes,
final ArrayList required,
final Attributes.Name listKey) {
final String names = attributes.getValue(listKey);
if (null == names) {
return;
}
final String[] extentions = split(names, " ");
for (int i = 0; i < extentions.length; i++) {
final String prefix = extentions[ i ] + "-";
final Extension extension = getExtension(prefix, attributes);
if (null != extension) {
required.add(extension);
}
}
}
/**
* Splits the string on every token into an array of strings.
*
* @param string the string
* @param onToken the token
* @return the resultant array
*/
private static final String[] split(final String string,
final String onToken) {
final StringTokenizer tokenizer = new StringTokenizer(string, onToken);
final String[] result = new String[ tokenizer.countTokens() ];
for (int i = 0; i < result.length; i++) {
result[ i ] = tokenizer.nextToken();
}
return result;
}
/**
* Extract an Extension from Attributes.
* Prefix indicates the prefix checked for each string.
* Usually the prefix is "<extension>-" if looking for a
* Required extension. If you are looking for an
* Available extension
* then the prefix is "".
*
* @param prefix the prefix for each attribute name
* @param attributes Attributes to searched
* @return the new Extension object, or null
*/
private static Extension getExtension(final String prefix,
final Attributes attributes) {
//WARNING: We trim the values of all the attributes because
//Some extension declarations are badly defined (ie have spaces
//after version or vendorID)
final String nameKey = prefix + EXTENSION_NAME;
final String name = getTrimmedString(attributes.getValue(nameKey));
if (null == name) {
return null;
}
final String specVendorKey = prefix + SPECIFICATION_VENDOR;
final String specVendor
= getTrimmedString(attributes.getValue(specVendorKey));
final String specVersionKey = prefix + SPECIFICATION_VERSION;
final String specVersion
= getTrimmedString(attributes.getValue(specVersionKey));
final String impVersionKey = prefix + IMPLEMENTATION_VERSION;
final String impVersion
= getTrimmedString(attributes.getValue(impVersionKey));
final String impVendorKey = prefix + IMPLEMENTATION_VENDOR;
final String impVendor
= getTrimmedString(attributes.getValue(impVendorKey));
final String impVendorIDKey = prefix + IMPLEMENTATION_VENDOR_ID;
final String impVendorId
= getTrimmedString(attributes.getValue(impVendorIDKey));
final String impURLKey = prefix + IMPLEMENTATION_URL;
final String impURL = getTrimmedString(attributes.getValue(impURLKey));
return new Extension(name, specVersion, specVendor, impVersion,
impVendor, impVendorId, impURL);
}
/**
* Trim the supplied string if the string is non-null
*
* @param value the string to trim or null
* @return the trimmed string or null
*/
private static String getTrimmedString(final String value) {
if (null == value) {
return null;
} else {
return value.trim();
}
}
}