319 lines
10 KiB
Java
319 lines
10 KiB
Java
/* Package.java -- information about a package
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Copyright (C) 2000, 2001, 2002, 2003, 2005 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.lang;
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import gnu.classpath.VMStackWalker;
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import java.net.URL;
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import java.util.NoSuchElementException;
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import java.util.StringTokenizer;
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/**
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* Everything you ever wanted to know about a package. This class makes it
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* possible to attach specification and implementation information to a
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* package as explained in the
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* <a href="http://java.sun.com/products/jdk/1.3/docs/guide/versioning/spec/VersioningSpecification.html#PackageVersionSpecification">Package Versioning Specification</a>
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* section of the
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* <a href="http://java.sun.com/products/jdk/1.3/docs/guide/versioning/spec/VersioningSpecification.html">Product Versioning Specification</a>.
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* It also allows packages to be sealed with respect to the originating URL.
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*
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* <p>The most useful method is the <code>isCompatibleWith()</code> method that
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* compares a desired version of a specification with the version of the
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* specification as implemented by a package. A package is considered
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* compatible with another version if the version of the specification is
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* equal or higher then the requested version. Version numbers are represented
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* as strings of positive numbers separated by dots (e.g. "1.2.0").
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* The first number is called the major number, the second the minor,
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* the third the micro, etc. A version is considered higher then another
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* version if it has a bigger major number then the another version or when
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* the major numbers of the versions are equal if it has a bigger minor number
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* then the other version, etc. (If a version has no minor, micro, etc numbers
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* then they are considered the be 0.)
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*
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* @author Mark Wielaard (mark@klomp.org)
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* @see ClassLoader#definePackage(String, String, String, String, String,
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* String, String, URL)
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* @since 1.2
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* @status updated to 1.4
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*/
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public class Package
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{
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/** The name of the Package */
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private final String name;
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/** The name if the implementation */
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private final String implTitle;
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/** The vendor that wrote this implementation */
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private final String implVendor;
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/** The version of this implementation */
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private final String implVersion;
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/** The name of the specification */
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private final String specTitle;
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/** The name of the specification designer */
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private final String specVendor;
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/** The version of this specification */
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private final String specVersion;
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/** If sealed the origin of the package classes, otherwise null */
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private final URL sealed;
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/**
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* A package local constructor for the Package class. All parameters except
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* the <code>name</code> of the package may be <code>null</code>.
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* There are no public constructors defined for Package; this is a package
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* local constructor that is used by java.lang.Classloader.definePackage().
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*
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* @param name The name of the Package
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* @param specTitle The name of the specification
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* @param specVendor The name of the specification designer
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* @param specVersion The version of this specification
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* @param implTitle The name of the implementation
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* @param implVendor The vendor that wrote this implementation
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* @param implVersion The version of this implementation
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* @param sealed If sealed the origin of the package classes
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*/
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Package(String name,
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String specTitle, String specVendor, String specVersion,
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String implTitle, String implVendor, String implVersion, URL sealed)
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{
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if (name == null)
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throw new IllegalArgumentException("null Package name");
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this.name = name;
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this.implTitle = implTitle;
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this.implVendor = implVendor;
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this.implVersion = implVersion;
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this.specTitle = specTitle;
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this.specVendor = specVendor;
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this.specVersion = specVersion;
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this.sealed = sealed;
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}
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/**
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* Returns the Package name in dot-notation.
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*
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* @return the non-null package name
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*/
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public String getName()
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{
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return name;
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}
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/**
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* Returns the name of the specification, or null if unknown.
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*
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* @return the specification title
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*/
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public String getSpecificationTitle()
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{
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return specTitle;
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}
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/**
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* Returns the version of the specification, or null if unknown.
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*
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* @return the specification version
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*/
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public String getSpecificationVersion()
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{
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return specVersion;
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}
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/**
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* Returns the name of the specification designer, or null if unknown.
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*
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* @return the specification vendor
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*/
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public String getSpecificationVendor()
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{
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return specVendor;
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}
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/**
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* Returns the name of the implementation, or null if unknown.
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*
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* @return the implementation title
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*/
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public String getImplementationTitle()
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{
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return implTitle;
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}
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/**
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* Returns the version of this implementation, or null if unknown.
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*
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* @return the implementation version
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*/
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public String getImplementationVersion()
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{
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return implVersion;
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}
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/**
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* Returns the vendor that wrote this implementation, or null if unknown.
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*
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* @return the implementation vendor
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*/
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public String getImplementationVendor()
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{
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return implVendor;
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}
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/**
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* Returns true if this Package is sealed.
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*
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* @return true if the package is sealed
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*/
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public boolean isSealed()
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{
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return sealed != null;
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}
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/**
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* Returns true if this Package is sealed and the origin of the classes is
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* the given URL.
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*
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* @param url the URL to test
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* @return true if the package is sealed by this URL
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* @throws NullPointerException if url is null
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*/
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public boolean isSealed(URL url)
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{
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return url.equals(sealed);
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}
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/**
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* Checks if the version of the specification is higher or at least as high
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* as the desired version. Comparison is done by sequentially comparing
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* dotted decimal numbers from the parameter and from
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* <code>getSpecificationVersion</code>.
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*
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* @param version the (minimal) desired version of the specification
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*
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* @return true if the version is compatible, false otherwise
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*
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* @Throws NumberFormatException if either version string is invalid
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* @throws NullPointerException if either version string is null
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*/
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public boolean isCompatibleWith(String version)
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{
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StringTokenizer versionTokens = new StringTokenizer(version, ".");
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StringTokenizer specTokens = new StringTokenizer(specVersion, ".");
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try
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{
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while (versionTokens.hasMoreElements())
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{
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int vers = Integer.parseInt(versionTokens.nextToken());
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int spec = Integer.parseInt(specTokens.nextToken());
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if (spec < vers)
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return false;
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else if (spec > vers)
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return true;
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// They must be equal, next Token please!
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}
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}
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catch (NoSuchElementException e)
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{
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// This must have been thrown by spec.nextToken() so return false.
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return false;
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}
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// They must have been exactly the same version.
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// Or the specVersion has more subversions. That is also good.
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return true;
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}
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/**
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* Returns the named package if it is known by the callers class loader.
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* It may return null if the package is unknown, when there is no
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* information on that particular package available or when the callers
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* classloader is null.
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*
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* @param name the name of the desired package
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* @return the package by that name in the current ClassLoader
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*/
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public static Package getPackage(String name)
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{
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// Get the caller's classloader
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ClassLoader cl = VMStackWalker.getCallingClassLoader();
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return cl != null ? cl.getPackage(name) : VMClassLoader.getPackage(name);
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}
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/**
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* Returns all the packages that are known to the callers class loader.
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* It may return an empty array if the classloader of the caller is null.
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*
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* @return an array of all known packages
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*/
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public static Package[] getPackages()
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{
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// Get the caller's classloader
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ClassLoader cl = VMStackWalker.getCallingClassLoader();
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return cl != null ? cl.getPackages() : VMClassLoader.getPackages();
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}
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/**
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* Returns the hashCode of the name of this package.
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*
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* @return the hash code
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*/
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public int hashCode()
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{
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return name.hashCode();
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}
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/**
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* Returns a string representation of this package. It is specified to
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* be <code>"package " + getName() + (getSpecificationTitle() == null
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* ? "" : ", " + getSpecificationTitle()) + (getSpecificationVersion()
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* == null ? "" : ", version " + getSpecificationVersion())</code>.
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*
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* @return the string representation of the package
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*/
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public String toString()
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{
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return ("package " + name + (specTitle == null ? "" : ", " + specTitle)
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+ (specVersion == null ? "" : ", version " + specVersion));
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}
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} // class Package
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