/* ====================================================================
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Copyright 2002-2004 Apache Software Foundation
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Licensed Under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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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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namespace HH.WMS.Utils.NPOI.HSSF.UserModel
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{
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using System;
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using System.IO;
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using System.Collections;
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using HH.WMS.Utils.NPOI.HSSF.Record;
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using HH.WMS.Utils.NPOI.Util;
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using HH.WMS.Utils.NPOI.HSSF.Model;
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using HH.WMS.Utils.NPOI.POIFS.FileSystem;
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/**
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* Represents binary object (i.e. OLE) data stored in the file. Eg. A GIF, JPEG etc...
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*
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* @author Daniel Noll
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*/
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public class HSSFObjectData
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{
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/**
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* Underlying object record ultimately containing a reference to the object.
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*/
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private ObjRecord record;
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/**
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* Reference to the filesystem root, required for retrieving the object data.
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*/
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private DirectoryEntry _root;
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/**
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* Constructs object data by wrapping a lower level object record.
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*
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* @param record the low-level object record.
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* @param poifs the filesystem, required for retrieving the object data.
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*/
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public HSSFObjectData(ObjRecord record, DirectoryEntry root)
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{
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this.record = record;
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_root = root;
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}
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/**
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* Returns the OLE2 Class Name of the object
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*/
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public String OLE2ClassName
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{
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get
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{
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return FindObjectRecord().OLEClassName;
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}
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}
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/**
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* Gets the object data. Only call for ones that have
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* data though. See {@link #hasDirectoryEntry()}
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*
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* @return the object data as an OLE2 directory.
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* @ if there was an error Reading the data.
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*/
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public DirectoryEntry GetDirectory()
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{
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EmbeddedObjectRefSubRecord subRecord = FindObjectRecord();
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int? streamId = ((EmbeddedObjectRefSubRecord)subRecord).StreamId;
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String streamName = "MBD" + HexDump.ToHex((int)streamId);
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Entry entry = _root.GetEntry(streamName);
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if (entry is DirectoryEntry)
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{
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return (DirectoryEntry)entry;
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}
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else
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{
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throw new IOException("Stream " + streamName + " was not an OLE2 directory");
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}
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}
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/**
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* Returns the data portion, for an ObjectData
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* that doesn't have an associated POIFS Directory
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* Entry
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*/
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public byte[] GetObjectData()
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{
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return FindObjectRecord().ObjectData;
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}
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/**
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* Does this ObjectData have an associated POIFS
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* Directory Entry?
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* (Not all do, those that don't have a data portion)
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*/
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public bool HasDirectoryEntry()
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{
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EmbeddedObjectRefSubRecord subRecord = FindObjectRecord();
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// 'stream id' field tells you
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int? streamId = subRecord.StreamId;
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return streamId != null && streamId != 0;
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}
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/**
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* Finds the EmbeddedObjectRefSubRecord, or throws an
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* Exception if there wasn't one
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*/
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public EmbeddedObjectRefSubRecord FindObjectRecord()
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{
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IEnumerator subRecordIter = record.SubRecords.GetEnumerator();
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while (subRecordIter.MoveNext())
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{
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Object subRecord = subRecordIter.Current;
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if (subRecord is EmbeddedObjectRefSubRecord)
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{
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return (EmbeddedObjectRefSubRecord)subRecord;
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}
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}
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throw new InvalidOperationException("Object data does not contain a reference to an embedded object OLE2 directory");
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}
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}
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}
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