org.armedbear.lisp.Packages Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of abcl Show documentation
Common Lisp implementation running on the JVM
There is a newer version: 1.9.2
/*
 * Packages.java
 *
 * Copyright (C) 2002-2007 Peter Graves 
 * $Id$
 *
 * This program 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
 * of the License, or (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * 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 org.armedbear.lisp;

import static org.armedbear.lisp.Lisp.*;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;

public final class Packages
{
  private static final ArrayList packages = new ArrayList();
  private static final HashMap map = new HashMap();

  public static final synchronized Package createPackage(String name)
  {
    return createPackage(name, 0);
  }

  public static final synchronized Package createPackage(String name, int size)
  {
    Package pkg = (Package) map.get(name);
    if (pkg == null)
      {
        pkg = size != 0 ? new Package(name, size) : new Package(name);
        packages.add(pkg);
        map.put(name, pkg);
      }
    else
      Debug.trace("package " + name + " already exists");
    return pkg;
  }

  public static final synchronized void addPackage(Package pkg)

  {
    final String name = pkg.getName();
    if (map.get(name) != null)
      {
        error(new LispError("A package named " + name + " already exists."));
        return;
      }
    packages.add(pkg);
    map.put(name, pkg);
    List nicknames = pkg.getNicknames();
    if (nicknames != null)
      {
        for (Iterator it = nicknames.iterator(); it.hasNext();)
          {
            String nickname = (String) it.next();
            addNickname(pkg, nickname);
          }
      }
  }

  /** 
      Returns the current package of the current LispThread.
      
      Intended to be used from Java code manipulating an Interpreter
      instance.
  */
  public static final synchronized Package findPackage(String name) {
    return getCurrentPackage().findPackage(name);
  }
    
  // Finds package named `name'.  Returns null if package doesn't exist.
  // Called by Package.findPackage after checking package-local package
  // nicknames.
  static final synchronized Package findPackageGlobally(String name)
  {
    return (Package) map.get(name);
  }

  public static final synchronized Package makePackage(String name)

  {
    if (map.get(name) != null)
      {
        error(new LispError("A package named " + name + " already exists."));
        // Not reached.
        return null;
      }
    Package pkg = new Package(name);
    packages.add(pkg);
    map.put(name, pkg);
    return pkg;
  }

  public static final synchronized void addNickname(Package pkg, String nickname)

  {
    Object obj = map.get(nickname);
    if (obj != null && obj != pkg)
      {
        error(new PackageError("A package named " + nickname + " already exists.", new SimpleString(nickname)));
        return;
      }
    map.put(nickname, pkg);
  }

  // Removes name and nicknames from map, removes pkg from packages.
  public static final synchronized boolean deletePackage(Package pkg)
  {
    String name = pkg.getName();
    if (name != null)
      {
        map.remove(name);
        List nicknames = pkg.getNicknames();
        if (nicknames != null)
          {
            for (Iterator it = nicknames.iterator(); it.hasNext();)
              {
                String nickname = (String) it.next();
                map.remove(nickname);
              }
          }
        packages.remove(pkg);
        return true;
      }
    return false;
  }

  public static final synchronized LispObject listAllPackages()
  {
    LispObject result = NIL;
    for (Package pkg : packages) {
      result = new Cons(pkg, result);
    }
    return result;
  }

  public static final synchronized Package[] getAllPackages()
  {
    Package[] array = new Package[packages.size()];
    packages.toArray(array);
    return array;
  }

  public static final synchronized LispObject getPackagesNicknamingPackage(Package thePackage)
  {
    LispObject result = NIL;
    for (Package pkg : packages) {
      for (Package nicknamedPackage : pkg.getLocallyNicknamedPackages()) {
        if (thePackage.equals(nicknamedPackage)) {
          result = new Cons(pkg, result);
        }
      }
    }
    return result;
  }
}