soot.util.ArrayNumberer Maven / Gradle / Ivy
/* Soot - a J*va Optimization Framework
* Copyright (C) 2002 Ondrej Lhotak
*
* 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.
*/
package soot.util;
import java.util.*;
/** A class that numbers objects, so they can be placed in bitsets.
*
* @author Ondrej Lhotak
* @author xiao, generalize it.
*/
public class ArrayNumberer implements IterableNumberer {
Numberable[] numberToObj = new Numberable[1024];
int lastNumber = 0;
public void add( E oo ) {
Numberable o = (Numberable) oo;
if( o.getNumber() != 0 ) return;
++lastNumber;
if( lastNumber >= numberToObj.length ) {
Numberable[] newnto = new Numberable[numberToObj.length*2];
System.arraycopy(numberToObj, 0, newnto, 0, numberToObj.length);
numberToObj = newnto;
}
numberToObj[lastNumber] = o;
o.setNumber( lastNumber );
}
public long get( E oo ) {
if( oo == null ) return 0;
Numberable o = (Numberable) oo;
int ret = o.getNumber();
if( ret == 0 ) throw new RuntimeException( "unnumbered: "+o );
return ret;
}
public E get( long number ) {
if( number == 0 ) return null;
E ret = (E) numberToObj[(int) number];
if( ret == null ) throw new RuntimeException( "no object with number "+number );
return ret;
}
public int size() { return lastNumber; }
public Iterator iterator() {
return new NumbererIterator();
}
final class NumbererIterator implements Iterator {
int cur = 1;
public final boolean hasNext() {
return cur < numberToObj.length && numberToObj[cur] != null;
}
public final E next() {
if( !hasNext() ) throw new NoSuchElementException();
return (E) numberToObj[cur++];
}
public final void remove() {
throw new UnsupportedOperationException();
}
}
}