/*
 * JasperReports - Free Java Reporting Library.
 * Copyright (C) 2001 - 2023 Cloud Software Group, Inc. All rights reserved.
 * http://www.jaspersoft.com
 *
 * Unless you have purchased a commercial license agreement from Jaspersoft,
 * the following license terms apply:
 *
 * This program is part of JasperReports.
 *
 * JasperReports 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 3 of the License, or
 * (at your option) any later version.
 *
 * JasperReports 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 JasperReports. If not, see <http://www.gnu.org/licenses/>.
 */
package net.sf.jasperreports.engine.data;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.ListIterator;
import java.util.Map;

import net.sf.jasperreports.engine.JRField;
import net.sf.jasperreports.engine.JRRewindableDataSource;
import net.sf.jasperreports.engine.JRRuntimeException;


/**
 * @author Teodor Danciu (teodord@users.sourceforge.net)
 */
public class ListOfArrayDataSource implements JRRewindableDataSource
{
	public static final String EXCEPTION_MESSAGE_KEY_FIELD_NOT_FOUND = "data.array.list.field.not.found";

	/**
	 *
	 */
	private List<Object[]> records = new ArrayList<>();
	private ListIterator<Object[]> iterator;
	protected Object[] currentRecord;
	private Map<String, Integer> columnNamesMap = new HashMap<>();


	/**
	 *
	 */
	public ListOfArrayDataSource(List<Object[]> records, String[] columnNames)
	{
		this.records = records;
		
		if (columnNames != null)
		{
			for (int i = 0; i < columnNames.length; i++)
			{
				columnNamesMap.put(columnNames[i], i);
			}
		}

		iterator = records.listIterator();
	}


	@Override
	public boolean next()
	{
		boolean hasNext = false;

		if (iterator != null)
		{
			hasNext = iterator.hasNext();

			if (hasNext)
			{
				currentRecord = iterator.next();
			}
		}

		return hasNext;
	}


	@Override
	public Object getFieldValue(JRField jrField)
	{
		Integer fieldIndex = columnNamesMap.get(jrField.getName());

		if (fieldIndex == null)
		{
			throw 
				new JRRuntimeException(
					EXCEPTION_MESSAGE_KEY_FIELD_NOT_FOUND,
					new Object[]{jrField.getName()});
		}

		return currentRecord[fieldIndex];
	}


	@Override
	public void moveFirst()
	{
		iterator = records.listIterator();
	}


	public int size()
	{
		return records.size();
	}
	
}
