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+/* PersistentContext.java -- The persistent naming context.
+ Copyright (C) 2006 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 gnu.classpath.tools.orbd;
+
+import gnu.CORBA.NamingService.NameTransformer;
+import gnu.CORBA.NamingService.TransientContext;
+
+import java.io.File;
+
+import org.omg.CORBA.ORB;
+import org.omg.CosNaming.NameComponent;
+import org.omg.CosNaming.NamingContext;
+import org.omg.CosNaming.NamingContextPackage.AlreadyBound;
+import org.omg.CosNaming.NamingContextPackage.CannotProceed;
+import org.omg.CosNaming.NamingContextPackage.InvalidName;
+import org.omg.CosNaming.NamingContextPackage.NotFound;
+
+/**
+ * This class implements the persistent naming service, defined by
+ * {@link NamingContext}. The 'persistent' means that the service remembers the
+ * mappings, stored between restarts.
+ *
+ * @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)
+ */
+public class PersistentContext
+ extends TransientContext
+{
+ /**
+ * Use serial version UID for interoperability.
+ */
+ private static final long serialVersionUID = 2;
+
+ /**
+ * The folder, where the persistent context information is stored.
+ */
+ File contextFolder;
+
+ /**
+ * The uinque context identifier.
+ */
+ static long num = System.currentTimeMillis();
+
+ /**
+ * The naming service orb.
+ */
+ ORB orb;
+
+ /**
+ * Create the persistent naming context that will store the files in the given
+ * folder of the local file system. This method also connects object to the
+ * passed ORB.
+ *
+ * @param an_orb the naming service ORB, used to obtain and produce the object
+ * stringified references.
+ * @param folder the folder, where the persistent information is stored.
+ * @param reset if true, the previous naming data are discarded. If false
+ * (normally expected), they are loaded from the persistent memory to
+ * provide the persistence.
+ */
+ public PersistentContext(ORB an_orb, File folder, boolean reset)
+ {
+ super(
+ new PersistentContextMap(an_orb, new File(folder, "contexts.txt"), reset),
+ new PersistentMap(an_orb, new File(folder, "objects.txt"), reset));
+ contextFolder = folder;
+ folder.mkdirs();
+ orb = an_orb;
+ orb.connect(this);
+ }
+
+ /**
+ * Get the unique context number;
+ *
+ * @return the context number
+ */
+ static synchronized String getNum()
+ {
+ return Long.toHexString(num++);
+ }
+
+ /**
+ * Create new persistent context.
+ */
+ public NamingContext new_context()
+ {
+ File ctxFolder = new File(contextFolder, "ctx_"+getNum());
+ return new PersistentContext(orb, ctxFolder, true);
+ }
+
+ /**
+ * Create a new context and give it a given name (bound it) in the current
+ * context. The method benefits from passing the better readable context name.
+ *
+ * @param a_name the name being given to the new context.
+ * @return the newly created context.
+ * @throws AlreadyBound if the name is already in use.
+ * @throws InvalidName if the name has zero length or otherwise invalid.
+ */
+ public NamingContext bind_new_context(NameComponent[] a_name)
+ throws NotFound, AlreadyBound, CannotProceed, InvalidName
+ {
+ if (named_contexts.containsKey(a_name[0])
+ || named_objects.containsKey(a_name[0]))
+ throw new AlreadyBound();
+
+ NameTransformer transformer = new NameTransformer();
+
+ File ctxFolder = new File(contextFolder,
+ transformer.toString(a_name).replace('/', '.')
+ + ".v" + getNum());
+
+ NamingContext child = new PersistentContext(orb, ctxFolder, true);
+ bind_context(a_name, child);
+ return child;
+ }
+}