EDIT

/**

* Copyright (C) 2009 EDIT

* European Distributed Institute of Taxonomy

* http://www.e-taxonomy.eu

*

* The contents of this file are subject to the Mozilla Public License Version 1.1

* See LICENSE.TXT at the top of this package for the full license terms.

*/

package eu.etaxonomy.cdm.io.dwca.in;

import java.io.IOException;

import java.util.HashMap;

import java.util.Map;

import org.apache.log4j.Logger;

import au.com.bytecode.opencsv.CSVReader;

import eu.etaxonomy.cdm.common.CdmUtils;

import eu.etaxonomy.cdm.io.common.IIoObservable;

import eu.etaxonomy.cdm.io.common.ObservableBase;

import eu.etaxonomy.cdm.io.dwca.TermUri;

import eu.etaxonomy.cdm.io.dwca.jaxb.ArchiveEntryBase;

import eu.etaxonomy.cdm.io.dwca.jaxb.Core;

import eu.etaxonomy.cdm.io.dwca.jaxb.Extension;

import eu.etaxonomy.cdm.io.dwca.jaxb.Field;

import eu.etaxonomy.cdm.io.stream.IItemStream;

import eu.etaxonomy.cdm.io.stream.StreamItem;

/**

 * @author a.mueller

 * @date 17.10.2011

 *

 */

public class CsvStream extends ObservableBase implements IIoObservable,IItemStream{

    private static final long serialVersionUID = -4828538731087241715L;

    @SuppressWarnings("unused")

	private static Logger logger = Logger.getLogger(CsvStream.class);

	private final CSVReader csvReader;

	private final ArchiveEntryBase archiveEntry;

	private final TermUri term;

	private int line = 0;

	private StreamItem next;

	public CsvStream (CSVReader csvReader, ArchiveEntryBase archiveEntry, int startLine){

		this.csvReader = csvReader;

		this.archiveEntry = archiveEntry;

		String rowType = archiveEntry.getRowType();

		term = TermUri.valueOfUriString(rowType);

		line = startLine;

		//FIXME what if null?

	}

	@Override

	public boolean hasNext(){

		if (next != null){

			return true;

		}else{

			next = readMe();

			return (next != null);

		}

	}

	@Override

	public StreamItem read(){

//		line++;

		return readMe();

	}

	@Override

	public String getItemLocation() {

		return CdmUtils.concat("/", this.getStreamLocation() ,String.valueOf(line));

	}

	private StreamItem readMe(){

		StreamItem resultItem;

		Map<String, String> resultMap;

		if (next != null){

			resultItem = next;

			next = null;

			return resultItem;

		}else{

			resultMap = new HashMap<>();

			try {

				String[] next = csvReader.readNext();

				line++;

				resultItem = new StreamItem(term, null, getItemLocation());

				if (next == null){

					return null;

				}

				for (Field field : archiveEntry.getField()){

			        int index = field.getIndex();

			        if (index > next.length -1){

		        		int missingFields = archiveEntry.getField().size() -  (next.length -1);

		        		String message = "Missing value for archive entry %s %s in line %d of input %s.";

		                String msgMoreLines = missingFields <= 1? "": "and %d more fields" ;

		        		msgMoreLines = String.format(msgMoreLines,(missingFields - 1) );

		                message = String.format(message, field.getTerm(), msgMoreLines, line, archiveEntry.getFiles().getLocation());

		                if (countObservers() == 0){

	                        throw new RuntimeException(message);

		                } else {

	                        StringBuilder messageSB = new StringBuilder(message);

	                        messageSB.append(" Line is only partly imported. Csv-Array is [");// + next.toString();

	                        for(int i=0;i<next.length;i++) {

                                messageSB.append(next[i]);

                                if(i < next.length-1){

                                    messageSB.append(",");

                                } else {

                                    messageSB.append("]");

                                }

	                        }

	                        message = messageSB.toString();

	                        fireWarningEvent(message, resultItem.getLocation(), 4);

	                        break;

		                }

			        }

					String value = next[index];

					String term = field.getTerm();

					resultMap.put(term, value);

				}

				if (archiveEntry instanceof Core){

					Core core = (Core)archiveEntry;

					resultMap.put("id", next[core.getId().getIndex()]);

				}else if(archiveEntry instanceof Extension){

					Extension extension = (Extension)archiveEntry;

					resultMap.put("coreId", next[extension.getCoreid().getIndex()]);

				}else{

					throw new RuntimeException("Unhandled archiveEntry type");

				}

			} catch (IOException e) {

				//TODO handle as event

				throw new RuntimeException(e);

			}

			resultItem.map = resultMap;

			if (resultItem.map == null){

				return null;

			}else {

				return resultItem;

			}

		}

	}

	public int getLine(){

		return line;

	}

	/**

	 * @return the term

	 */

	@Override

	public TermUri getTerm() {

		return term;

	}

	@Override

	public String getStreamLocation() {

		return this.archiveEntry.getFiles().getLocation();

	}

//******************************** TO STRING **************************************/

	@Override

	public String toString(){

		if (archiveEntry == null){

			return super.toString();

		}else{

			return "CsvStream for " + CdmUtils.Nz(archiveEntry.getRowType() + " at line " + line);

		}

	}

}