/*
openDICOM.NET openDICOM# 0.1.1
openDICOM# provides a library for DICOM related development on Mono.
Copyright (C) 2006-2007 Albert Gnandt
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
$Id: DataSet.cs 48 2007-03-28 13:49:15Z agnandt $
*/
using System;
using System.IO;
using System.Collections;
using openDicom.DataStructure;
using openDicom.Encoding;
namespace openDicom.DataStructure.DataSet{
/// <summary>
/// This class represents a DICOM data set.
/// </summary>
/// <remarks>
/// This is the basic container class for all other DICOM stream
/// releated container classes with unique data element support.
/// DICOM data set is an ascending ordered sequence of data elements
/// with unique DICOM tags.
/// </remarks>
public class DataSet: Sequence
{
// key index pair for access of Sequence as array
private Hashtable keys = new Hashtable();
/// <summary>
/// Access of a DICOM data set instance as array of
/// <see cref="DataElement" />. The index is a DICOM tag.
/// </summary>
public DataElement this[Tag tag]
{
get
{
int index = (int) keys[tag.ToString()];
return base[index];
}
}
/// <summary>
/// Creates a new empty DICOM data set instance.
/// </summary>
public DataSet() {}
/// <summary>
/// Creates a new DICOM data set instance and fills it from
/// specified DICOM output stream using the default transfer
/// syntax.
/// </summary>
public DataSet(Stream stream): base(stream) {}
/// <summary>
/// Creates a new DICOM data set instance and fills it from
/// specified DICOM output stream using specified transfer
/// syntax.
/// </summary>
public DataSet(Stream stream, TransferSyntax transferSyntax):
base(stream, transferSyntax) {}
/// <summary>
/// Re-creates a new DICOM data set instance and fills it from
/// specified DICOM output stream using
/// <see cref="Sequence.TransferSyntax" />.
/// </summary>
public override void LoadFrom(Stream stream)
{
streamPosition = stream.Position;
TransferSyntax.CharacterRepertoire = CharacterRepertoire.Default;
bool isTrailingPadding = false;
while (stream.Position < stream.Length && ! isTrailingPadding)
{
DataElement element = new DataElement(stream, TransferSyntax);
if (element.Tag.Equals(CharacterRepertoire.CharacterSetTag))
TransferSyntax.CharacterRepertoire =
new CharacterRepertoire((string) element.Value[0]);
isTrailingPadding = element.Tag.Equals("(0000,0000)");
if ( ! isTrailingPadding)
Add(element);
}
}
/// <summary>
/// Adds a new DICOM data element to this data set instance.
/// Multiple data elements of the same DICOM tag are not allowed
/// within a data set. Uniqueness is guaranteed by DICOM tags.
/// </summary>
public override int Add(DataElement dataElement)
{
int index = base.Add(dataElement);
keys.Add(dataElement.Tag.ToString(), index);
return index;
}
/// <summary>
/// Concatenates another DICOM data set instance with this data set
/// instance. Multiple data elements of the same DICOM tag are not
/// allowed during concatentation. Uniqueness is guaranteed by
/// DICOM tags.
/// </summary>
public void Add(DataSet dataSet)
{
foreach (DataElement element in dataSet)
Add(element);
}
/// <summary>
/// Returns all sequences of all levels of a data set tree as
/// one concatenated zero-level sequence. Multiple data elements
/// of equal instances are allowed within a DICOM sequence.
/// </summary>
public override Sequence GetJointSubsequences()
{
return base.GetJointSubsequences();
}
/// <summary>
/// Determines whether this data set instance contains a data
/// element with specified DICOM tag.
/// </summary>
public bool Contains(Tag tag)
{
return keys.Contains(tag.ToString());
}
/// <summary>
/// Clears all DICOM data set properties.
/// </summary>
public override void Clear()
{
keys.Clear();
base.Clear();
}
/// <summary>
/// Sorts all data elements of a data set instance by their DICOM
/// tag in ascending order.
/// </summary>
public override void Sort()
{
base.Sort();
for (int index = 0; index < Count; index++)
{
string tagKey = base[index].Tag.ToString();
keys[tagKey] = index;
}
}
}
}
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