aoqi@0: /*
aoqi@0:  * Copyright (c) 1998, 2007, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.  Oracle designates this
aoqi@0:  * particular file as subject to the "Classpath" exception as provided
aoqi@0:  * by Oracle in the LICENSE file that accompanied this code.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  */
aoqi@0: 
aoqi@0: /*
aoqi@0:  * Licensed Materials - Property of IBM
aoqi@0:  * RMI-IIOP v1.0
aoqi@0:  * Copyright IBM Corp. 1998 1999  All Rights Reserved
aoqi@0:  *
aoqi@0:  */
aoqi@0: 
aoqi@0: package sun.rmi.rmic.iiop;
aoqi@0: 
aoqi@0: import java.util.Hashtable;
aoqi@0: 
aoqi@0: /**
aoqi@0:  * A NameContext enables detection of strings which differ only
aoqi@0:  * in case.
aoqi@0:  *
aoqi@0:  * @author      Bryan Atsatt
aoqi@0:  */
aoqi@0: class NameContext {
aoqi@0: 
aoqi@0:     private Hashtable table;
aoqi@0:     private boolean allowCollisions;
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Get a context for the given name. Name may be null, in
aoqi@0:      * which case this method will return the default context.
aoqi@0:      */
aoqi@0:     public static synchronized NameContext forName (String name,
aoqi@0:                                                     boolean allowCollisions,
aoqi@0:                                                     BatchEnvironment env) {
aoqi@0: 
aoqi@0:         NameContext result = null;
aoqi@0: 
aoqi@0:         // Do we need to use the default context?
aoqi@0: 
aoqi@0:         if (name == null) {
aoqi@0: 
aoqi@0:             // Yes.
aoqi@0: 
aoqi@0:             name = "null";
aoqi@0:         }
aoqi@0: 
aoqi@0:         // Have we initialized our hashtable?
aoqi@0: 
aoqi@0:         if (env.nameContexts == null) {
aoqi@0: 
aoqi@0:             // Nope, so do it...
aoqi@0: 
aoqi@0:             env.nameContexts = new Hashtable();
aoqi@0: 
aoqi@0:         } else {
aoqi@0: 
aoqi@0:             // Yes, see if we already have the requested
aoqi@0:             // context...
aoqi@0: 
aoqi@0:             result = (NameContext) env.nameContexts.get(name);
aoqi@0:         }
aoqi@0: 
aoqi@0:         // Do we have the requested context?
aoqi@0: 
aoqi@0:         if (result == null) {
aoqi@0: 
aoqi@0:             // Nope, so create and add it...
aoqi@0: 
aoqi@0:             result = new NameContext(allowCollisions);
aoqi@0: 
aoqi@0:             env.nameContexts.put(name,result);
aoqi@0:         }
aoqi@0: 
aoqi@0:         return result;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Construct a context.
aoqi@0:      * @param allowCollisions true if case-sensitive name collisions
aoqi@0:      * are allowed, false if not.
aoqi@0:      */
aoqi@0:     public NameContext (boolean allowCollisions) {
aoqi@0:         this.allowCollisions = allowCollisions;
aoqi@0:         table = new Hashtable();
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Add a name to this context. If constructed with allowCollisions
aoqi@0:      * false and a collision occurs, this method will throw an exception
aoqi@0:      * in which the message contains the string: "name" and "collision".
aoqi@0:      */
aoqi@0:     public void assertPut (String name) throws Exception {
aoqi@0: 
aoqi@0:         String message = add(name);
aoqi@0: 
aoqi@0:         if (message != null) {
aoqi@0:             throw new Exception(message);
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Add a name to this context..
aoqi@0:      */
aoqi@0:     public void put (String name) {
aoqi@0: 
aoqi@0:         if (allowCollisions == false) {
aoqi@0:             throw new Error("Must use assertPut(name)");
aoqi@0:         }
aoqi@0: 
aoqi@0:         add(name);
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Add a name to this context. If constructed with allowCollisions
aoqi@0:      * false and a collision occurs, this method will return a message
aoqi@0:      * string, otherwise returns null.
aoqi@0:      */
aoqi@0:     private String add (String name) {
aoqi@0: 
aoqi@0:         // First, create a key by converting name to lowercase...
aoqi@0: 
aoqi@0:         String key = name.toLowerCase();
aoqi@0: 
aoqi@0:         // Does this key exist in the context?
aoqi@0: 
aoqi@0:         Name value = (Name) table.get(key);
aoqi@0: 
aoqi@0:         if (value != null) {
aoqi@0: 
aoqi@0:             // Yes, so they match if we ignore case. Do they match if
aoqi@0:             // we don't ignore case?
aoqi@0: 
aoqi@0:             if (!name.equals(value.name)) {
aoqi@0: 
aoqi@0:                 // No, so this is a case-sensitive match. Are we
aoqi@0:                 // supposed to allow this?
aoqi@0: 
aoqi@0:                 if (allowCollisions) {
aoqi@0: 
aoqi@0:                     // Yes, make sure it knows that it collides...
aoqi@0: 
aoqi@0:                     value.collisions = true;
aoqi@0: 
aoqi@0:                 } else {
aoqi@0: 
aoqi@0:                     // No, so return a message string...
aoqi@0: 
aoqi@0:                     return new String("\"" + name + "\" and \"" + value.name + "\"");
aoqi@0:                 }
aoqi@0:             }
aoqi@0:         } else {
aoqi@0: 
aoqi@0:             // No, so add it...
aoqi@0: 
aoqi@0:             table.put(key,new Name(name,false));
aoqi@0:         }
aoqi@0: 
aoqi@0:         return null;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Get a name from the context. If it has collisions, the name
aoqi@0:      * will be converted as specified in section 5.2.7.
aoqi@0:      */
aoqi@0:     public String get (String name) {
aoqi@0: 
aoqi@0:         Name it = (Name) table.get(name.toLowerCase());
aoqi@0:         String result = name;
aoqi@0: 
aoqi@0:         // Do we need to mangle it?
aoqi@0: 
aoqi@0:         if (it.collisions) {
aoqi@0: 
aoqi@0:             // Yep, so do it...
aoqi@0: 
aoqi@0:             int length = name.length();
aoqi@0:             boolean allLower = true;
aoqi@0: 
aoqi@0:             for (int i = 0; i < length; i++) {
aoqi@0: 
aoqi@0:                 if (Character.isUpperCase(name.charAt(i))) {
aoqi@0:                     result += "_";
aoqi@0:                     result += i;
aoqi@0:                     allLower = false;
aoqi@0:                 }
aoqi@0:             }
aoqi@0: 
aoqi@0:             if (allLower) {
aoqi@0:                 result += "_";
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         return result;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Remove all entries.
aoqi@0:      */
aoqi@0:     public void clear () {
aoqi@0:         table.clear();
aoqi@0:     }
aoqi@0: 
aoqi@0:     public class Name {
aoqi@0:         public String name;
aoqi@0:         public boolean collisions;
aoqi@0: 
aoqi@0:         public Name (String name, boolean collisions) {
aoqi@0:             this.name = name;
aoqi@0:             this.collisions = collisions;
aoqi@0:         }
aoqi@0:     }
aoqi@0: }