| /* ==================================================================== |
| 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.poi.xssf.streaming; |
| |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import java.util.Iterator; |
| |
| import org.apache.logging.log4j.LogManager; |
| import org.apache.logging.log4j.Logger; |
| import org.apache.poi.ss.usermodel.Sheet; |
| import org.apache.poi.util.Beta; |
| import org.apache.poi.util.NotImplemented; |
| import org.apache.poi.xssf.usermodel.XSSFSheet; |
| import org.apache.poi.xssf.usermodel.XSSFWorkbook; |
| |
| /** |
| * An variant of SXSSFWorkbook that avoids generating a temporary file and writes data directly to |
| * the provided OutputStream. |
| * |
| * This variant is experimental and APIs may change at short notice. |
| * |
| * @since 5.0.0 |
| */ |
| @Beta |
| public class DeferredSXSSFWorkbook extends SXSSFWorkbook { |
| private static final Logger LOG = LogManager.getLogger(DeferredSXSSFWorkbook.class); |
| |
| public DeferredSXSSFWorkbook() { |
| this(null); |
| } |
| |
| public DeferredSXSSFWorkbook(int rowAccessWindowSize) { this(null, rowAccessWindowSize); } |
| |
| public DeferredSXSSFWorkbook(XSSFWorkbook workbook) { |
| this(workbook, SXSSFWorkbook.DEFAULT_WINDOW_SIZE); |
| } |
| |
| public DeferredSXSSFWorkbook(XSSFWorkbook workbook, int rowAccessWindowSize) { |
| super(workbook, rowAccessWindowSize, false, false); |
| } |
| |
| @NotImplemented |
| @Override |
| protected SheetDataWriter createSheetDataWriter() throws IOException { |
| throw new RuntimeException("Not supported by DeferredSXSSFWorkbook"); |
| } |
| |
| protected StreamingSheetWriter createSheetDataWriter(OutputStream out) throws IOException { |
| return new StreamingSheetWriter(out); |
| } |
| |
| @Override |
| protected ISheetInjector createSheetInjector(SXSSFSheet sxSheet) throws IOException { |
| DeferredSXSSFSheet ssxSheet = (DeferredSXSSFSheet) sxSheet; |
| return (output) -> { |
| ssxSheet.writeRows(output); |
| }; |
| } |
| |
| @Override |
| SXSSFSheet createAndRegisterSXSSFSheet(XSSFSheet xSheet) { |
| final DeferredSXSSFSheet sxSheet; |
| try { |
| sxSheet = new DeferredSXSSFSheet(this, xSheet); |
| } catch (IOException ioe) { |
| throw new RuntimeException(ioe); |
| } |
| registerSheetMapping(sxSheet, xSheet); |
| return sxSheet; |
| } |
| |
| public DeferredSXSSFSheet createSheet() { |
| return (DeferredSXSSFSheet) super.createSheet(); |
| } |
| |
| public DeferredSXSSFSheet createSheet(String sheetname) { |
| return (DeferredSXSSFSheet) super.createSheet(sheetname); |
| } |
| |
| /** |
| * Returns an iterator of the sheets in the workbook in sheet order. Includes hidden and very hidden sheets. |
| * |
| * @return an iterator of the sheets. |
| */ |
| @Override |
| public Iterator<Sheet> sheetIterator() { |
| return new SheetIterator<>(); |
| } |
| |
| /** |
| * Gets the sheet at the given index for streaming. |
| * |
| * @param index the index |
| * @return the streaming sheet at |
| */ |
| public DeferredSXSSFSheet getStreamingSheetAt(int index) { |
| XSSFSheet xSheet = _wb.getSheetAt(index); |
| SXSSFSheet sxSheet = getSXSSFSheet(xSheet); |
| if (sxSheet == null && xSheet != null) { |
| return (DeferredSXSSFSheet) createAndRegisterSXSSFSheet(xSheet); |
| } else { |
| return (DeferredSXSSFSheet) sxSheet; |
| } |
| } |
| |
| public XSSFSheet getXSSFSheet(String name) { |
| return _wb.getSheet(name); |
| } |
| |
| /** |
| * Gets sheet with the given name for streaming. |
| * |
| * @param name the name |
| * @return the streaming sheet |
| */ |
| public DeferredSXSSFSheet getStreamingSheet(String name) { |
| XSSFSheet xSheet = _wb.getSheet(name); |
| DeferredSXSSFSheet sxSheet = (DeferredSXSSFSheet) getSXSSFSheet(xSheet); |
| if (sxSheet == null && xSheet != null) { |
| return (DeferredSXSSFSheet) createAndRegisterSXSSFSheet(xSheet); |
| } else { |
| return sxSheet; |
| } |
| } |
| |
| /** |
| * Removes sheet at the given index |
| * |
| * @param index of the sheet to remove (0-based) |
| */ |
| @Override |
| public void removeSheetAt(int index) { |
| // Get the sheet to be removed |
| XSSFSheet xSheet = _wb.getSheetAt(index); |
| SXSSFSheet sxSheet = getSXSSFSheet(xSheet); |
| |
| // De-register it |
| _wb.removeSheetAt(index); |
| |
| // The sheet may not be a streaming sheet and is not mapped |
| if (sxSheet != null) { |
| deregisterSheetMapping(xSheet); |
| |
| // Clean up temporary resources |
| try { |
| sxSheet.dispose(); |
| } catch (IOException e) { |
| LOG.atWarn().withThrowable(e).log("Failed to cleanup old sheet"); |
| } |
| } |
| } |
| } |