PB2JSON.java

/*******************************************************************************
 * Copyright (c) 2011 The Board of Trustees of the Leland Stanford Junior University
 * as Operator of the SLAC National Accelerator Laboratory.
 * Copyright (c) 2011 Brookhaven National Laboratory.
 * EPICS archiver appliance is distributed subject to a Software License Agreement found
 * in file LICENSE that is included with this distribution.
 *******************************************************************************/
package edu.stanford.slac.archiverappliance.PlainPB.utils;

import java.nio.file.Path;
import java.nio.file.Paths;

import org.epics.archiverappliance.Event;
import org.epics.archiverappliance.common.TimeUtils;
import org.epics.archiverappliance.data.DBRTimeEvent;
import org.json.simple.JSONObject;

import edu.stanford.slac.archiverappliance.PlainPB.FileBackedPBEventStream;
import edu.stanford.slac.archiverappliance.PlainPB.PBFileInfo;

/**
 * @author mshankar
 *	Prints a JSON version of the data in a PB file.
 */
public class PB2JSON {
	@SuppressWarnings("unchecked")
	public static void main(String[] args) throws Exception {
		if(args == null || args.length < 1) { 
			System.err.println("Usage: java edu.stanford.slac.archiverappliance.PlainPB.utils.PB2JSON <PBFiles>");
			return;
		}

		System.out.println('[');
		boolean firstline = true;
		for(String fileName : args) {
			Path path = Paths.get(fileName);
			PBFileInfo info = new PBFileInfo(path);
			try (FileBackedPBEventStream strm = new FileBackedPBEventStream(info.getPVName(), path, info.getType())) {
				for(Event ev : strm) {
					DBRTimeEvent tev = (DBRTimeEvent) ev;
					JSONObject obj = new JSONObject();
					obj.put("timeStamp", TimeUtils.convertToISO8601String(tev.getEventTimeStamp()));
					obj.put("value", tev.getSampleValue().toString());
					obj.put("status", tev.getStatus());
					obj.put("severity", tev.getSeverity());
					if(tev.hasFieldValues()) {
						JSONObject fieldValues = new JSONObject();
						fieldValues.putAll(tev.getFields());
						obj.put("fields", fieldValues);
					}
					if(firstline) { firstline = false; } else { System.out.println(","); }
					System.out.print(obj);
				}
			}
		}
		System.out.println();
		System.out.println(']');
	}
}