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76 lines
2.3 KiB
Java
76 lines
2.3 KiB
Java
/* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the 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 Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*
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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
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* terms of the GNU Public License (the "GPL"), in which case the
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* provisions of the GPL are applicable instead of those above.
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* If you wish to allow use of your version of this file only
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* under the terms of the GPL and not to allow others to use your
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* version of this file under the NPL, indicate your decision by
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* deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL. If you do not delete
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* the provisions above, a recipient may use your version of this
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* file under either the NPL or the GPL.
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*/
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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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