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Statistical parsing of English sentences

, 13 Dec 2006
Shows how to generate parse trees for English language sentences, using a C# port of OpenNLP, a statistical natural language parsing library.
englishparsing_bin.zip
englishparsing_net2_0_bin.zip
englishparsing_net2_0_src.zip
Lithium
Collections
Delegates
Enums
Interfaces
IO
Lithium.csproj.vspscc
LithiumControl.bmp
Shapes
UI
Visitors
ModelConverter
App.ico
ModelConverter.csproj.vspscc
ParseTree
App.ico
ParseTree.csproj.vspscc
ToolsExample
App.ico
ToolsExample.csproj.vspscc
OpenNLP
OpenNLP.csproj.vspscc
SharpEntropy.dll
Tools
Chunker
NameFind
Parser
PosTagger
SentenceDetect
Tokenize
Util
englishparsing_src.zip
Lithium.csproj.user
LithiumControl.bmp
App.ico
ModelConverter.csproj.user
OpenNLP.csproj.user
SharpEntropy.dll
vssver.scc
vssver.scc
vssver.scc
vssver.scc
vssver.scc
vssver.scc
vssver.scc
App.ico
ParseTree.csproj.user
App.ico
ToolsExample.csproj.user
//Copyright (C) 2005 Richard J. Northedge
//
// 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 program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

using System;
using System.Collections.Generic;

namespace OpenNLP.Tools.Util
{
	/// <summary>
	/// This class manages a set of elements.
	/// </summary>
	public class Set<T> : List<T>
	{
		/// <summary>
		/// Creates a new set.
		/// </summary>
		public Set(): base()
		{           
		}

		/// <summary>
		/// Creates a new set initialized with ICollection object
		/// </summary>
		/// <param name="collection">
		/// ICollection object to initialize the set object
		/// </param>
		public Set(ICollection<T> collection): base(collection)
		{           
		}

		/// <summary>
		/// Creates a new set initialized with a specific capacity.
		/// </summary>
		/// <param name="capacity">
		/// value to set the capacity of the set object
		/// </param>
		public Set(int capacity): base(capacity)
		{           
		}
	 
		/// <summary>
		/// Adds an element to the set.
		/// </summary>
		/// <param name="item">
		/// The object to be added.
		/// </param>
		/// <returns>
		/// True if the object was added, false otherwise.
		/// </returns>
		public new virtual bool Add(T item)
		{
            if (this.Contains(item))
            {
                return false;
            }
            else
            {
                base.Add(item);
                return true;
            }
		}
	 
		/// <summary>
		/// Adds all the elements contained in the specified collection.
		/// </summary>
		/// <param name="collection">
		/// The collection used to extract the elements that will be added.
		/// </param>
		/// <returns>
		/// Returns true if all the elements were successfuly added. Otherwise returns false.
		/// </returns>
		public virtual bool AddAll(ICollection<T> collection)
		{
			bool result = false;
			if (collection != null)
			{
                foreach (T item in collection)
                {
                    result = this.Add(item);
                }
			}
			return result;
		}
	 
		/// <summary>
		/// Verifies that all the elements of the specified collection are contained into the current collection. 
		/// </summary>
		/// <param name="collection">
		/// The collection used to extract the elements that will be verified.
		/// </param>
		/// <returns>
		/// True if the collection contains all the given elements.
		/// </returns>
		public virtual bool ContainsAll(ICollection<T> collection)
		{
			bool result = false;
            foreach (T item in collection)
            {
                if (!(result = this.Contains(item)))
                {
                    break;
                }
            }
			return result;
		}
	 
		/// <summary>
		/// Verifies if the collection is empty.
		/// </summary>
		/// <returns>
		/// True if the collection is empty, false otherwise.
		/// </returns>
		public virtual bool IsEmpty()
		{
			return (this.Count == 0);
		}
	 	 
		/// <summary>
		/// Removes an element from the set.
		/// </summary>
		/// <param name="elementToRemove">
		/// The element to be removed.
		/// </param>
		/// <returns>
		/// True if the element was removed.
		/// </returns>
		public new virtual bool Remove(T elementToRemove)
		{
			bool result = false;
			if (this.Contains(elementToRemove))
			{
				result = true;
			}
			base.Remove(elementToRemove);
			return result;
		}
		
		/// <summary>
		/// Removes all the elements contained in the specified collection.
		/// </summary>
		/// <param name="collection">
		/// The collection used to extract the elements that will be removed.
		/// </param>
		/// <returns>
		/// True if all the elements were successfuly removed, false otherwise.
		/// </returns>
		public virtual bool RemoveAll(ICollection<T> collection)
		{ 
			bool result = false;
            foreach (T item in collection)
            {
                if ((!result) && (this.Contains(item)))
                {
                    result = true;
                }
                this.Remove(item);
            }
			return result;
		}

		/// <summary>
		/// Removes all the elements that aren't contained in the specified collection.
		/// </summary>
		/// <param name="collection">
		/// The collection used to verify the elements that will be retained.
		/// </param>
		/// <returns>
		/// True if all the elements were successfully removed, false otherwise.
		/// </returns>
		public virtual bool RetainAll(ICollection<T> collection)
		{
			bool result = false;
            
			IEnumerator<T> enumerator = collection.GetEnumerator();
			Set<T> currentSet = (Set<T>)collection;
			while (enumerator.MoveNext())
				if (!currentSet.Contains(enumerator.Current))
				{
					result = this.Remove(enumerator.Current);
					enumerator = this.GetEnumerator();
				}
			return result;
		}
	 
		/// <summary>
		/// Obtains an array containing all the elements in the collection.
		/// </summary>
		/// <param name="objects">
		/// The array into which the elements of the collection will be stored.
		/// </param>
		/// <returns>
		/// The array containing all the elements of the collection.
		/// </returns>
		public virtual T[] ToArray(T[] objects)
		{
			int index = 0;
            foreach (T item in this)
			{
				objects[index++] = item;
			}
			return objects;
		}		 
	}
}

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About the Author

Richard Northedge
Web Developer
United Kingdom United Kingdom
Richard Northedge is a senior developer with a UK Microsoft Gold Partner company. He has a postgraduate degree in English Literature, has been programming professionally since 1998 and has been an MCSD since 2000.

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