/* ====================================================================
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for Additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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==================================================================== */
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using HH.WMS.Utils.NPOI.POIFS.Common;
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using HH.WMS.Utils.NPOI.POIFS.Dev;
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using HH.WMS.Utils.NPOI.POIFS.Properties;
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using HH.WMS.Utils.NPOI.Util;
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using System.IO;
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using System.Collections.Generic;
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using System;
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using System.Text;
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using System.Collections;
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using HH.WMS.Utils.NPOI.POIFS.NIO;
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namespace HH.WMS.Utils.NPOI.POIFS.FileSystem
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{
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/**
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* This class manages a document in the NIO POIFS filesystem.
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* This is the {@link NPOIFSFileSystem} version.
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*/
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public class NPOIFSDocument : POIFSViewable
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{
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private DocumentProperty _property;
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private NPOIFSFileSystem _filesystem;
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private NPOIFSStream _stream;
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private int _block_size;
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/**
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* Constructor for an existing Document
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*/
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public NPOIFSDocument(DocumentProperty property, NPOIFSFileSystem filesystem)
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{
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this._property = property;
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this._filesystem = filesystem;
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if (property.Size < POIFSConstants.BIG_BLOCK_MINIMUM_DOCUMENT_SIZE)
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{
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_stream = new NPOIFSStream(_filesystem.GetMiniStore(), property.StartBlock);
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_block_size = _filesystem.GetMiniStore().GetBlockStoreBlockSize();
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}
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else
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{
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_stream = new NPOIFSStream(_filesystem, property.StartBlock);
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_block_size = _filesystem.GetBlockStoreBlockSize();
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}
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}
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/**
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* Constructor for a new Document
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*
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* @param name the name of the POIFSDocument
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* @param stream the InputStream we read data from
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*/
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public NPOIFSDocument(String name, NPOIFSFileSystem filesystem, Stream stream)
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{
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this._filesystem = filesystem;
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// Buffer the contents into memory. This is a bit icky...
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// TODO Replace with a buffer up to the mini stream size, then streaming write
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byte[] contents;
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if (stream is MemoryStream)
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{
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MemoryStream bais = (MemoryStream)stream;
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contents = new byte[bais.Length];
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bais.Read(contents, 0, contents.Length);
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}
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else
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{
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MemoryStream baos = new MemoryStream();
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IOUtils.Copy(stream, baos);
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contents = baos.ToArray();
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}
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// Do we need to store as a mini stream or a full one?
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if (contents.Length <= POIFSConstants.BIG_BLOCK_MINIMUM_DOCUMENT_SIZE)
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{
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_stream = new NPOIFSStream(filesystem.GetMiniStore());
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_block_size = _filesystem.GetMiniStore().GetBlockStoreBlockSize();
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}
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else
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{
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_stream = new NPOIFSStream(filesystem);
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_block_size = _filesystem.GetBlockStoreBlockSize();
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}
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// Store it
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_stream.UpdateContents(contents);
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// And build the property for it
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this._property = new DocumentProperty(name, contents.Length);
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_property.StartBlock = _stream.GetStartBlock();
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}
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public int GetDocumentBlockSize()
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{
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return _block_size;
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}
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public IEnumerator<ByteBuffer> GetBlockIterator()
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{
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if (Size > 0)
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{
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return _stream.GetBlockIterator();
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}
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else
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{
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//List<byte[]> empty = Collections.emptyList();
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List<ByteBuffer> empty = new List<ByteBuffer>();
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return empty.GetEnumerator();
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}
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}
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/**
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* @return size of the document
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*/
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public int Size
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{
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get
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{
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return _property.Size;
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}
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}
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/**
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* @return the instance's DocumentProperty
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*/
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public DocumentProperty DocumentProperty
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{
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get
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{
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return _property;
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}
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}
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/**
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* Get an array of objects, some of which may implement POIFSViewable
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*
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* @return an array of Object; may not be null, but may be empty
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*/
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protected Object[] GetViewableArray()
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{
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Object[] results = new Object[1];
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String result;
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try
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{
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if (Size > 0)
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{
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// Get all the data into a single array
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byte[] data = new byte[Size];
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int offset = 0;
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foreach (ByteBuffer buffer in _stream)
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{
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int length = Math.Min(_block_size, data.Length - offset);
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buffer.Read(data, offset, length);
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offset += length;
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}
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MemoryStream output = new MemoryStream();
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HexDump.Dump(data, 0, output, 0);
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result = output.ToString();
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}
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else
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{
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result = "<NO DATA>";
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}
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}
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catch (IOException e)
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{
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result = e.Message;
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}
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results[0] = result;
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return results;
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}
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/**
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* Get an Iterator of objects, some of which may implement POIFSViewable
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*
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* @return an Iterator; may not be null, but may have an empty back end
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* store
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*/
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protected IEnumerator GetViewableIterator()
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{
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// return Collections.EMPTY_LIST.iterator();
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return null;
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}
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/**
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* Provides a short description of the object, to be used when a
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* POIFSViewable object has not provided its contents.
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*
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* @return short description
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*/
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protected String GetShortDescription()
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{
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StringBuilder buffer = new StringBuilder();
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buffer.Append("Document: \"").Append(_property.Name).Append("\"");
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buffer.Append(" size = ").Append(Size);
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return buffer.ToString();
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}
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#region POIFSViewable Members
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public bool PreferArray
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{
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get { return true; }
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}
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public string ShortDescription
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{
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get { return GetShortDescription(); }
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}
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public Array ViewableArray
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{
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get { return GetViewableArray(); }
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}
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public IEnumerator ViewableIterator
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{
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get { return GetViewableIterator(); }
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}
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#endregion
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}
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}
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