/*
* @(#)CVMpkg.java 1.10 06/10/10
*
* Copyright 1990-2008 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 only, as published by the Free Software Foundation.
*
* 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 version 2 for more details (a copy is
* included at /legal/license.txt).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this work; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*
*/
package vm;
import java.util.Vector;
/*
* Package name in CVM type system.
*/
public class CVMpkg {
public String pkgName;
public CVMpkg next;
public CVMDataType typeData[];
public int entryNo;
public final static int NCLASSHASH = 11;
public final static int NPACKAGEHASH = 17;
public static Vector pkgVector = new Vector(); // must come before nullPackage!
public static CVMpkg packages[] = new CVMpkg[NPACKAGEHASH];
static int nextPkgNo = 0;
synchronized static void enlist( CVMpkg x ){
x.entryNo = nextPkgNo++;
pkgVector.addElement( x );
}
CVMpkg( String pname ){
pkgName = pname;
next = null;
typeData = new CVMDataType[NCLASSHASH];
enlist( this );
}
/*
* order matters. In order to invoke the usual constructor,
* this seems to have to follow it!!
*/
public static CVMpkg nullPackage = new CVMpkg( "" );
public static CVMpkg
lookup( String pkgname ){
if ( pkgname.length() == 0 ) return nullPackage;
pkgname = pkgname.intern();
long nameHash = CVMDataType.computeHash( pkgname );
/* make sure % is unsigned! */
int bucket = (int)((nameHash&0xffffffffL) % (long)NPACKAGEHASH);
/*DEBUG System.out.println("hash package "+pkgname+" to "+bucket); */
for ( CVMpkg thisPkg = packages[bucket];
thisPkg != null;
thisPkg = thisPkg.next )
{
if ( pkgname == thisPkg.pkgName )
return thisPkg;
}
// not there, must add.
CVMpkg p = new CVMpkg( pkgname );
p.next = packages[bucket];
packages[bucket] = p;
return p;
}
}