a .NET library that can read/write Office formats without Microsoft Office installed. No COM+, no interop.
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/* ==================================================================== 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. ==================================================================== */
namespace NPOI { using System; using System.Text; using NPOI.OpenXml4Net.OPC; using NPOI.OpenXml4Net.Util;
public abstract class POIXMLTextExtractor : POITextExtractor { /** The POIXMLDocument that's open */ private readonly POIXMLDocument _document;
/** * Creates a new text extractor for the given document */ public POIXMLTextExtractor(POIXMLDocument document) {
_document = document; }
/** * Returns the core document properties */ public CoreProperties GetCoreProperties() { return _document.GetProperties().CoreProperties; } /** * Returns the extended document properties */ public ExtendedProperties GetExtendedProperties() { return _document.GetProperties().ExtendedProperties; } /** * Returns the custom document properties */ public CustomProperties GetCustomProperties() { return _document.GetProperties().CustomProperties; }
/** * Returns opened document */ public POIXMLDocument Document { get{ return _document; } }
/** * Returns the opened OPCPackage that Contains the document */ public OPCPackage Package { get { return _document.Package; } }
/** * Returns an OOXML properties text extractor for the * document properties metadata, such as title and author. */ public override POITextExtractor MetadataTextExtractor { get { return new POIXMLPropertiesTextExtractor(_document); } }
public override void Close() { // e.g. XSSFEventBaseExcelExtractor passes a null-document
if (_document != null) { OPCPackage pkg = _document.Package; if (pkg != null) { pkg.Revert(); } } base.Close(); }
protected void CheckMaxTextSize(StringBuilder text, String string1) { if(string1 == null) { return; }
int size = text.Length + string1.Length; if(size > ZipSecureFile.GetMaxTextSize()) { throw new InvalidOperationException("The text would exceed the max allowed overall size of extracted text. " + "By default this is prevented as some documents may exhaust available memory and it may indicate that the file is used to inflate memory usage and thus could pose a security risk. " + "You can adjust this limit via ZipSecureFile.setMaxTextSize() if you need to work with files which have a lot of text. " + "Size: " + size + ", limit: MAX_TEXT_SIZE: " + ZipSecureFile.GetMaxTextSize()); } } }
}
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