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'Databene Formats' is an open source software library for supporting data file and other formats like CSV, fixed width files, XLS, Properties and Regex. It is designed for multithreaded use and high performance.

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/*
 * Copyright (C) 2011-2015 Volker Bergmann ([email protected]).
 * All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.databene.formats.util;

import org.databene.formats.DataContainer;
import org.databene.formats.DataIterator;
import org.databene.formats.DataSource;

/**
 * {@link DataSource} proxy which provides a subset of the source's data defined by an offset.
 * Created: 24.07.2011 09:59:24
 * @param  the type of data to iterate
 * @since 0.6.0
 * @author Volker Bergmann
 */
public class OffsetDataSource extends DataSourceProxy {

	protected int offset;
	
	public OffsetDataSource(DataSource source, int offset) {
		super(source);
		this.offset = offset;
	}

	@Override
	public DataIterator iterator() {
		DataContainer container = new DataContainer();
		DataIterator result = super.iterator();
		for (int i = 0; i < offset; i++)
			result.next(container);
		return result;
	}
	
	@Override
	public String toString() {
		return getClass().getSimpleName() + '[' + offset + ", " + source + ']';
	}
	
}