Mega Code Archive
Set which counts the number of times a values are added to it
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///////////////////////////////////////////////////////////////////////////////
//Copyright (C) 2003 Thomas Morton
//
//This library is free software; you can redistribute it and/or
//modify it under the terms of the GNU Lesser General Public
//License as published by the Free Software Foundation; either
//version 2.1 of the License, or (at your option) any later version.
//
//This library 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 Lesser General Public License for more details.
//
//You should have received a copy of the GNU Lesser General Public
//License along with this program; if not, write to the Free Software
//Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//////////////////////////////////////////////////////////////////////////////
//package opennlp.tools.util;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
/**
* Set which counts the number of times a values are added to it.
* This value can be accessed with the #getCount method.
*/
public class CountedSet implements Set {
private Map cset;
private static Integer ONE = Integer.valueOf(1);
/**
* Creates a new counted set.
*/
public CountedSet() {
cset = new HashMap();
}
/** Creates a new counted set of the specified initial size.
* @param size The initial size of this set.
*/
public CountedSet(int size) {
cset = new HashMap(size);
}
public boolean add(Object o) {
Integer count = (Integer) cset.get(o);
if ( count == null ) {
cset.put(o, ONE);
return true;
}
else {
cset.put(o, Integer.valueOf(count.intValue()+1));
return false;
}
}
/**
* Reduces the count associated with this object by 1. If this causes the count
* to become 0, then the object is removed form the set.
* @param o The object whose count is being reduced.
*/
public void subtract(Object o) {
Integer count = (Integer) cset.get(o);
if ( count != null ) {
int c = count.intValue()-1;
if (c == 0) {
cset.remove(o);
}
else {
cset.put(o, Integer.valueOf(c));
}
}
}
/**
* Assigns the specified object the specified count in the set.
* @param o The object to be added or updated in the set.
* @param c The count of the specified object.
*/
public void setCount(Object o,int c) {
cset.put(o, Integer.valueOf(c));
}
/**
* Return the count of the specified object.
* @param o the object whose count needs to be determined.
* @return the count of the specified object.
*/
public int getCount(Object o) {
Integer count = (Integer) cset.get(o);
if ( count == null ) {
return 0;
}
else {
return count.intValue();
}
}
public void write(String fileName,int countCutoff) {
write(fileName,countCutoff," ");
}
public void write(String fileName,int countCutoff,String delim) {
write(fileName,countCutoff,delim,null);
}
public void write(String fileName,int countCutoff,String delim,String encoding) {
PrintWriter out = null;
try{
if (encoding != null) {
out = new PrintWriter(new OutputStreamWriter(new FileOutputStream(fileName),encoding));
}
else {
out = new PrintWriter(new FileWriter(fileName));
}
for (Iterator e = cset.keySet().iterator(); e.hasNext();) {
Object key = e.next();
int count = this.getCount(key);
if ( count >= countCutoff ) {
out.println(count + delim + key);
}
}
out.close();
}
catch (IOException e) {
System.err.println(e);
}
}
public boolean addAll(Collection c) {
boolean changed = false;
for (Iterator ci = c.iterator();ci.hasNext();) {
changed = changed || add(ci.next());
}
return changed;
}
public void clear() {
cset.clear();
}
public boolean contains(Object o) {
return cset.keySet().contains(o);
}
public boolean containsAll(Collection c) {
return cset.keySet().containsAll(c);
}
public boolean isEmpty() {
return cset.isEmpty();
}
public Iterator iterator() {
return cset.keySet().iterator();
}
public boolean remove(Object o) {
return cset.remove(o) != null;
}
public boolean removeAll(Collection c) {
boolean changed =false;
for (Iterator ki = cset.keySet().iterator();ki.hasNext();) {
changed = changed || cset.remove(ki.next()) != null;
}
return changed;
}
public boolean retainAll(Collection c) {
boolean changed = false;
for (Iterator ki = cset.keySet().iterator();ki.hasNext();) {
Object key = ki.next();
if (!c.contains(key)) {
cset.remove(key);
changed = true;
}
}
return changed;
}
public int size() {
return cset.size();
}
public Object[] toArray() {
return cset.keySet().toArray();
}
public Object[] toArray(Object[] arg0) {
return cset.keySet().toArray(arg0);
}
}
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