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java.lang
Class Package

java.lang.Object
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 +--java.lang.Package

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public class Package

extends Object

Untamed:

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pkgs

private static Map pkgs

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urls

private static Map urls

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mans

private static Map mans

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pkgName

private String pkgName

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specTitle

private String specTitle

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specVersion

private String specVersion

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specVendor

private String specVendor

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implTitle

private String implTitle

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implVersion

private String implVersion

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implVendor

private String implVendor

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sealBase

private URL sealBase

Package

Package(String name,
 String spectitle,
 String specversion,
 String specvendor,
 String impltitle,
 String implversion,
 String implvendor,
 URL sealbase)

Construct a package instance with the specified version information.

Parameters:

spectitle - the title of the specification

specversion - the version of the specification

specvendor - the organization that maintains the specification

impltitle - the title of the implementation

implversion - the version of the implementation

implvendor - the organization that maintains the implementation

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Package

private Package(String name,
 java.util.jar.Manifest man,
 URL url)

getName

public String getName()

Enabled: Return the name of this package.

Returns:

The name of this package using the Java language dot notation for the package. i.e java.lang

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getSpecificationTitle

public String getSpecificationTitle()

Enabled: Return the title of the specification that this package implements.

Returns:

the specification title, null is returned if it is not known.

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getSpecificationVersion

public String getSpecificationVersion()

Enabled: Returns the version number of the specification that this package implements. This version string must be a sequence of positive decimal integers separated by "."'s and may have leading zeros. When version strings are compared the most significant numbers are compared.

Returns:

the specification version, null is returned if it is not known.

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getSpecificationVendor

public String getSpecificationVendor()

Enabled: Return the name of the organization, vendor, or company that owns and maintains the specification of the classes that implement this package.

Returns:

the specification vendor, null is returned if it is not known.

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getImplementationTitle

public String getImplementationTitle()

Enabled: Return the title of this package.

Returns:

the title of the implementation, null is returned if it is not known.

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getImplementationVersion

public String getImplementationVersion()

Enabled: Return the version of this implementation. It consists of any string assigned by the vendor of this implementation and does not have any particular syntax specified or expected by the Java runtime. It may be compared for equality with other package version strings used for this implementation by this vendor for this package.

Returns:

the version of the implementation, null is returned if it is not known.

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getImplementationVendor

public String getImplementationVendor()

Enabled: Returns the name of the organization, vendor or company that provided this implementation.

Returns:

the vendor that implemented this package..

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isSealed

public boolean isSealed()

Enabled: Returns true if this package is sealed.

Returns:

true if the package is sealed, false otherwise

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isSealed

public boolean isSealed(URL url)

Enabled: Returns true if this package is sealed with respect to the specified code source url.

Parameters:

url - the code source url

Returns:

true if this package is sealed with respect to url

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isCompatibleWith

public boolean isCompatibleWith(String desired)
 throws NumberFormatException

Enabled: Compare this package's specification version with a desired version. It returns true if this packages specification version number is greater than or equal to the desired version number.

Version numbers are compared by sequentially comparing corresponding components of the desired and specification strings. Each component is converted as a decimal integer and the values compared. If the specification value is greater than the desired value true is returned. If the value is less false is returned. If the values are equal the period is skipped and the next pair of components is compared.

Parameters:

desired - the version string of the desired version.

Returns:

true if this package's version number is greater than or equal to the desired version number

NumberFormatException

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getPackage

public static Package getPackage(String name)

Enabled: Find a package by name in the callers ClassLoader instance. The callers ClassLoader instance is used to find the package instance corresponding to the named class. If the callers ClassLoader instance is null then the set of packages loaded by the system ClassLoader instance is searched to find the named package.

Packages have attributes for versions and specifications only if the class loader created the package instance with the appropriate attributes. Typically, those attributes are defined in the manifests that accompany the classes.

Parameters:

name - a package name, for example, java.lang.

Returns:

the package of the requested name. It may be null if no package information is available from the archive or codebase.

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getPackages

public static Package[] getPackages()

Enabled: Get all the packages currently known for the caller's ClassLoader instance. Those packages correspond to classes loaded via or accessible by name to that ClassLoader instance. If the caller's ClassLoader instance is the bootstrap ClassLoader instance, which may be represented by null in some implementations, only packages corresponding to classes loaded by the bootstrap ClassLoader instance will be returned.

Returns:

a new array of packages known to the callers ClassLoader instance. An zero length array is returned if none are known.

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getPackage

static Package getPackage(Class c)

Get the package for the specified class. The class's class loader is used to find the package instance corresponding to the specified class. If the class loader is the bootstrap class loader, which may be represented by null in some implementations, then the set of packages loaded by the bootstrap class loader is searched to find the package.

Packages have attributes for versions and specifications only if the class loader created the package instance with the appropriate attributes. Typically those attributes are defined in the manifests that accompany the classes.

Returns:

the package of the class. It may be null if no package information is available from the archive or codebase.

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hashCode

public int hashCode()

Suppressed: Return the hash code computed from the package name.

Overrides:

hashCode in class Object

Returns:

the hash code computed from the package name.

See Also:

java.lang.Object#equals(java.lang.Object), java.util.Hashtable

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toString

public String toString()

Suppressed: Returns the string representation of this Package. Its value is the string "package " and the package name. If the package title is defined it is appended. If the package version is defined it is appended.

Overrides:

toString in class Object

Returns:

the string representation of the package.

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getSystemPackage

static Package getSystemPackage(String name)

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getSystemPackages

static Package[] getSystemPackages()

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defineSystemPackage

private static Package defineSystemPackage(String iname,
 String fn)

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loadManifest

private static java.util.jar.Manifest loadManifest(String fn)

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getSystemPackage0

private static String getSystemPackage0(String name)

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getSystemPackages0

private static String[] getSystemPackages0()

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