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80 lines
2.6 KiB
Java
80 lines
2.6 KiB
Java
/* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Communicator client code, released
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* March 31, 1998.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Patrick C. Beard <beard@netscape.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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import java.util.Enumeration;
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import java.util.Hashtable;
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/**
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* Provides a simple way to tally the occurrence of unique objects.
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*/
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public class Histogram {
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private static class Bin {
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int count = 0;
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};
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private Hashtable bins = new Hashtable();
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public void record(Object object) {
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Bin bin = (Bin) bins.get(object);
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if (bin == null) {
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bin = new Bin();
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bins.put(object, bin);
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}
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++bin.count;
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}
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public Object[] objects() {
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int count = bins.size();
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Object[] objects = new Object[count];
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Enumeration e = bins.keys();
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while (e.hasMoreElements())
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objects[--count] = e.nextElement();
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return objects;
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}
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public int count(Object object) {
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Bin bin = (Bin) bins.get(object);
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if (bin != null)
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return bin.count;
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else
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return 0;
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}
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}
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