| /* |
| * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code 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 in the LICENSE file that |
| * accompanied this code). |
| * |
| * 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package jdk.nashorn.internal.codegen; |
| |
| import static jdk.nashorn.internal.codegen.MethodEmitter.LARGE_STRING_THRESHOLD; |
| |
| import java.util.HashMap; |
| |
| /** |
| * A name space hierarchy, where each level holds a name directory with |
| * names that may be unique for each level. |
| */ |
| |
| public class Namespace { |
| /** Parent namespace. */ |
| private final Namespace parent; |
| |
| /** Name directory - version count for each name */ |
| private final HashMap<String, Integer> directory; |
| |
| /** |
| * Constructor |
| */ |
| public Namespace() { |
| this(null); |
| } |
| |
| /** |
| * Constructor |
| * |
| * @param parent parent name space |
| */ |
| public Namespace(final Namespace parent) { |
| this.parent = parent; |
| this.directory = new HashMap<>(); |
| } |
| |
| /** |
| * Return the parent Namespace of this space. |
| * |
| * @return parent name space |
| */ |
| public Namespace getParent() { |
| return parent; |
| } |
| |
| /** |
| * Create a uniqueName name in the namespace in the form base-n where n varies. |
| * Also truncates very long names that would otherwise break ASM. |
| * |
| * @param base Base of name. Base will be returned if uniqueName. |
| * @return Generated uniqueName name. |
| */ |
| public String uniqueName(final String base) { |
| final String truncatedBase = base.length() > LARGE_STRING_THRESHOLD ? base.substring(0, LARGE_STRING_THRESHOLD) : base; |
| for (Namespace namespace = this; namespace != null; namespace = namespace.getParent()) { |
| final HashMap<String, Integer> namespaceDirectory = namespace.directory; |
| final Integer counter = namespaceDirectory.get(truncatedBase); |
| |
| if (counter != null) { |
| final int count = counter + 1; |
| namespaceDirectory.put(truncatedBase, count); |
| return truncatedBase + CompilerConstants.ID_FUNCTION_SEPARATOR.symbolName() + count; |
| } |
| } |
| |
| directory.put(truncatedBase, 0); |
| |
| return truncatedBase; |
| } |
| |
| @Override |
| public String toString() { |
| return directory.toString(); |
| } |
| } |