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