package net.sf.jasperreports.engine.data;

import java.text.DateFormat;
import java.io.InputStream;
import java.io.File;
import java.io.Reader;
import java.io.FileNotFoundException;
import java.io.InputStreamReader;
import java.io.FileReader;

import net.sf.jasperreports.engine.JRDataSourceProvider;
import net.sf.jasperreports.engine.JRDataSource;
import net.sf.jasperreports.engine.JasperReport;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JRField;

/**
 * @author Ionut Nedelcu (ionutned@users.sourceforge.net)
 * @version $Id$
 */
public class JRCsvDataSourceProvider implements JRDataSourceProvider
{
	private Reader reader;

	private DateFormat dateFormat;
	private char fieldDelimiter;
	private String recordDelimiter;
	private String[] columnNames;


	/**
	 * @param stream an input stream containing CSV data
	 */
	public JRCsvDataSourceProvider(InputStream stream)
	{
		this(new InputStreamReader(stream));
	}


	/**
	 * Builds a datasource instance.
	 * @param file a file containing CSV data
	 */
	public JRCsvDataSourceProvider(File file) throws FileNotFoundException
	{
		this(new FileReader(file));
	}


	/**
	 * Builds a datasource instance.
	 * @param reader a <tt>Reader</tt> instance, for reading the stream
	 */
	public JRCsvDataSourceProvider(Reader reader)
	{
		this.reader = reader;
	}

	/**
	 *
	 */
	public boolean supportsGetFieldsOperation()
	{
		return false;
	}


	/**
	 *
	 */
	public JRField[] getFields(JasperReport report) throws JRException, UnsupportedOperationException
	{
		return null;
	}


	/**
	 *
	 */
	public JRDataSource create(JasperReport report) throws JRException
	{
		JRCsvDataSource ds;
		if (reader != null)
			 ds = new JRCsvDataSource(reader);
		else {
			throw new JRException("Cannot find a source to read the data from");
		}

		ds.setDateFormat(dateFormat);
		ds.setFieldDelimiter(fieldDelimiter);
		ds.setRecordDelimiter(recordDelimiter);
		ds.setColumnNames(columnNames);

		return ds;
	}


	/**
	 *
	 */
	public void dispose(JRDataSource dataSource) throws JRException
	{
	}

	public String[] getColumnNames()
	{
		return columnNames;
	}

	public void setColumnNames(String[] columnNames)
	{
		this.columnNames = columnNames;
	}

	public DateFormat getDateFormat()
	{
		return dateFormat;
	}

	public void setDateFormat(DateFormat dateFormat)
	{
		this.dateFormat = dateFormat;
	}

	public char getFieldDelimiter()
	{
		return fieldDelimiter;
	}

	public void setFieldDelimiter(char fieldDelimiter)
	{
		this.fieldDelimiter = fieldDelimiter;
	}

	public String getRecordDelimiter()
	{
		return recordDelimiter;
	}

	public void setRecordDelimiter(String recordDelimiter)
	{
		this.recordDelimiter = recordDelimiter;
	}
}