package edu.umd.cs.findbugs;
import java.util.Map;

import edu.umd.cs.findbugs.ba.AnalysisContext;

public class AnalysisLocal<T> {
    protected T initialValue() {
        return null;
    }

    protected Map getMap() {
	AnalysisContext t = AnalysisContext.currentAnalysisContext();
	return  t.analysisLocals;
	}

   public T  get() {
		Map m = getMap();
		if (m.containsKey(this)) return (T) m.get(this);
		
		synchronized(m) {
		    if (m.containsKey(this)) return (T) m.get(this);
		    T result = initialValue();
		    m.put(this,result);
		    return (T) result;
		    }
		}
   public  void set(T value) {
		Map m = getMap();
		m.put(this, value);
		}
   public  void  remove() {
		Map m = getMap();
		m.remove(this);
		}
}

/*
 * FindBugs - Find bugs in Java programs
 * Copyright (C) 2004,2005 University of Maryland
 * 
 * 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 edu.umd.cs.findbugs;
import java.util.Map;

import edu.umd.cs.findbugs.ba.AnalysisContext;

public class AnalysisLocal<T> {
    protected T initialValue() {
        return null;
    }

    protected Map getMap() {
	AnalysisContext t = AnalysisContext.currentAnalysisContext();
	return  t.analysisLocals;
	}

   public T  get() {
		Map m = getMap();
		if (m.containsKey(this)) return (T) m.get(this);
		
		synchronized(m) {
		    if (m.containsKey(this)) return (T) m.get(this);
		    T result = initialValue();
		    m.put(this,result);
		    return (T) result;
		    }
		}
   public  void set(T value) {
		Map m = getMap();
		m.put(this, value);
		}
   public  void  remove() {
		Map m = getMap();
		m.remove(this);
		}
}

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