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MapNumberer.java
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package soot.util;
/*-
* #%L
* Soot - a J*va Optimization Framework
* %%
* Copyright (C) 2004 Ondrej Lhotak
* %%
* This program 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 program 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 Lesser Public License for more details.
*
* You should have received a copy of the GNU General Lesser Public
* License along with this program. If not, see
* <http://www.gnu.org/licenses/lgpl-2.1.html>.
* #L%
*/
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
public class MapNumberer<T> implements Numberer<T> {
final Map<T, Integer> map = new HashMap<T, Integer>();
final ArrayList<T> al = new ArrayList<T>();
int nextIndex = 1;
public MapNumberer() {
al.add(null);
}
@Override
public void add(T o) {
if (!map.containsKey(o)) {
map.put(o, nextIndex);
al.add(o);
nextIndex++;
}
}
@Override
public T get(long number) {
return al.get((int) number);
}
@Override
public long get(Object o) {
if (o == null) {
return 0;
}
Integer i = map.get(o);
if (i == null) {
throw new RuntimeException("couldn't find " + o);
}
return i;
}
@Override
public int size() {
/* subtract 1 for null */
return nextIndex - 1;
}
public boolean contains(Object o) {
return map.containsKey(o);
}
@Override
public boolean remove(T o) {
Integer i = map.remove(o);
if (i == null) {
return false;
} else {
al.set(i, null);
return true;
}
}
}