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/*
* 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 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$n where n varies
* .
* @param base Base of name. Base will be returned if uniqueName.
*
* @return Generated uniqueName name.
*/
public String uniqueName(final String base) {
for (Namespace namespace = this; namespace != null; namespace = namespace.getParent()) {
final HashMap<String, Integer> namespaceDirectory = namespace.directory;
final Integer counter = namespaceDirectory.get(base);
if (counter != null) {
final int count = counter + 1;
namespaceDirectory.put(base, count);
return base + "$" + count;
}
}
directory.put(base, 0);
return base;
}
@Override
public String toString() {
return directory.toString();
}
}
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