source: trunk/EventBenchConsole/src/de/ugoe/cs/eventbench/data/GlobalDataContainer.java @ 134

package de.ugoe.cs.eventbench.data;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;

public class GlobalDataContainer implements Serializable {
        
        /**
         * Id for object serialization.
         */
        private static final long serialVersionUID = 1L;

        transient private static GlobalDataContainer theInstance = null;
        
        private Map<String, Object> dataObjects;
        
        public static GlobalDataContainer getInstance() {
                if( theInstance==null ) {
                        theInstance = new GlobalDataContainer();
                }
                return theInstance;
        }
        
        private void writeObject(ObjectOutputStream s) throws IOException {
                s.defaultWriteObject();
                s.writeObject(dataObjects);
        }
        
        @SuppressWarnings("unchecked")
        private void readObject(ObjectInputStream s) throws IOException, ClassNotFoundException {
                s.defaultReadObject();
                if( theInstance==null ) {
                        theInstance = new GlobalDataContainer();
                }
                theInstance.dataObjects = (Map<String, Object>) s.readObject();
        }
        
        private Object readResolve() {
                return theInstance;
        }
        
        private GlobalDataContainer() {
                dataObjects = new HashMap<String, Object>();
        }
        
        public boolean addData(String key, Object data) {
                Object previousEntry = dataObjects.put(key, data);
                return previousEntry!=null;
        }
        
        public boolean removeData(String key) {
                Object previousEntry = dataObjects.remove(key);
                return previousEntry==null;
        }
        
        public Object getData(String key) {
                return dataObjects.get(key);
        }
        
        public void reset() {
                dataObjects = new HashMap<String, Object>();
        }

}