//
// Copyright (C) 2012 United States Government as represented by the
// Administrator of the National Aeronautics and Space Administration
// (NASA). All Rights Reserved.
//
// This software is distributed under the NASA Open Source Agreement
// (NOSA), version 1.3. The NOSA has been approved by the Open Source
// Initiative. See the file NOSA-1.3-JPF at the top of the distribution
// directory tree for the complete NOSA document.
//
// THE SUBJECT SOFTWARE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY OF ANY
// KIND, EITHER EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING, BUT NOT
// LIMITED TO, ANY WARRANTY THAT THE SUBJECT SOFTWARE WILL CONFORM TO
// SPECIFICATIONS, ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR
// A PARTICULAR PURPOSE, OR FREEDOM FROM INFRINGEMENT, ANY WARRANTY THAT
// THE SUBJECT SOFTWARE WILL BE ERROR FREE, OR ANY WARRANTY THAT
// DOCUMENTATION, IF PROVIDED, WILL CONFORM TO THE SUBJECT SOFTWARE.
//
package gov.nasa.jpf.vm;
/**
* set that stores threads via (search global) thread ids. Used to detect shared objects/classes,
* created by configured SharedObjectPolicy factory.
* This set is persistent, i.e. does not modify contents of existing set instances to avoid
* introducing search global state
*/
public class PersistentTidSet extends TidSet {
public PersistentTidSet (ThreadInfo ti){
super(ti);
}
//--- non-destructive set update
@Override
public ThreadInfoSet add (ThreadInfo ti) {
int id = ti.getId();
if (!contains(id)){
PersistentTidSet newSet = (PersistentTidSet)clone();
newSet.add(id);
return newSet;
} else {
return this;
}
}
@Override
public ThreadInfoSet remove (ThreadInfo ti) {
int id = ti.getId();
if (contains(id)){
PersistentTidSet newSet = (PersistentTidSet)clone();
newSet.remove(id);
return newSet;
} else {
return this;
}
}
}