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