org.apache.metamodel.excel.XlsDataSet Maven / Gradle / Ivy
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.metamodel.excel;
import java.util.Iterator;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.metamodel.data.AbstractDataSet;
import org.apache.metamodel.data.DataSet;
import org.apache.metamodel.data.Row;
import org.apache.metamodel.query.SelectItem;
/**
* Stream {@link DataSet} implementation for Excel support.
*/
final class XlsDataSet extends AbstractDataSet {
private final Iterator _rowIterator;
private final Workbook _workbook;
private volatile org.apache.poi.ss.usermodel.Row _row;
private volatile boolean _closed;
/**
* Creates an XLS dataset
*
* @param selectItems
* the selectitems representing the columns of the table
* @param workbook
* @param rowIterator
*/
public XlsDataSet(SelectItem[] selectItems, Workbook workbook,
Iterator rowIterator) {
super(selectItems);
_workbook = workbook;
_rowIterator = rowIterator;
_closed = false;
}
@Override
public boolean next() {
if (_rowIterator.hasNext()) {
_row = _rowIterator.next();
return true;
} else {
_row = null;
_closed = true;
return false;
}
}
@Override
public Row getRow() {
if (_closed) {
return null;
}
return ExcelUtils.createRow(_workbook, _row, getHeader());
}
}