org.databene.webdecs.util.OffsetDataSource Maven / Gradle / Ivy
/*
* (c) Copyright 2011 by Volker Bergmann. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, is permitted under the terms of the
* GNU General Public License (GPL).
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* WITHOUT A WARRANTY OF ANY KIND. ALL EXPRESS OR IMPLIED CONDITIONS,
* REPRESENTATIONS AND WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE
* HEREBY EXCLUDED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
package org.databene.webdecs.util;
import org.databene.webdecs.DataContainer;
import org.databene.webdecs.DataIterator;
import org.databene.webdecs.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;
}
public String toString() {
return getClass().getSimpleName() + '[' + offset + ", " + source + ']';
}
}