/* Soot - a J*va Optimization Framework
* Copyright (C) 2002 Florian Loitsch
*
* 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 library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* Modified by the Sable Research Group and others 1997-1999.
* See the 'credits' file distributed with Soot for the complete list of
* contributors. (Soot is distributed at http://www.sable.mcgill.ca/soot)
*/
package soot.toolkits.scalar;
import java.util.*;
/**
* gives an injection of Objects to ints. Different instances of
* <code>ObjectIntMap</code> may map different ints to the same object.
*/
public class ObjectIntMapper<E> {
private Vector<E> intToObjects;
private int counter;
private Map<E, Integer> objectToInts;
public ObjectIntMapper() {
intToObjects = new Vector<E>();
objectToInts = new HashMap<E, Integer>();
counter = 0;
}
public ObjectIntMapper(FlowUniverse<E> flowUniverse) {
this(flowUniverse.iterator(), flowUniverse.size());
}
public ObjectIntMapper(Collection<E> collection) {
this(collection.iterator(), collection.size());
}
private ObjectIntMapper(Iterator<E> it, int initSize) {
intToObjects = new Vector<E>(initSize);
objectToInts = new HashMap<E, Integer>(initSize);
counter = 0;
while (it.hasNext())
add(it.next());
}
/**
* adds <code>o</code> into the map. no test are made, if it is already in the
* map.
*/
public int add(E o) {
objectToInts.put(o, counter);
intToObjects.add(o);
return counter++;
}
/**
* returns the mapping of <code>o</code>. if there has been a call to
* <code>objectToInt</code> with the same <code>o</code> before, the same
* value will be returned.
*
* @param o
* @return <code>o</code>'s mapping
*/
public int getInt(E o) {
Integer i = objectToInts.get(o);
if (i != null) return i;
return add(o);
}
/**
* returns the object associated to <code>i</code>.
*
* @param i
* @return <code>i</code>'s object
*/
public Object getObject(int i) {
return intToObjects.get(i);
}
/**
* returns true, if <code>o</code> has already been mapped.
*
* @param o
* @return true if <code>o</code> has already a number.
*/
public boolean contains(Object o) {
return objectToInts.containsKey(o);
}
/**
* returns the number of mapped objects.
*/
public int size() {
return counter;
}
}