org.databene.formats.util.OffsetDataSource Maven / Gradle / Ivy

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/*
 * Copyright (C) 2011-2014 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
 * @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 + ']';
	}
	
}