ImmutableSet.cs :  » GIS » DeepEarth » Iesi_NTS » Collections » Generic » C# / CSharp Open Source

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C# / CSharp Open Source » GIS » DeepEarth 
DeepEarth » Iesi_NTS » Collections » Generic » ImmutableSet.cs
/* Copyright  2002-2004 by Aidant Systems, Inc., and by Jason Smith. */
using System;
using System.Collections.Generic;

namespace Iesi_NTS.Collections.Generic{
  /// <summary>
  /// <p>Implements an immutable (read-only) <c>Set</c> wrapper.</p>
  /// <p>Although this is advertised as immutable, it really isn't.  Anyone with access to the
  /// <c>basisSet</c> can still change the data-set.  So <c>GetHashCode()</c> is not implemented
  /// for this <c>Set</c>, as is the case for all <c>Set</c> implementations in this library.
  /// This design decision was based on the efficiency of not having to <c>Clone()</c> the 
  /// <c>basisSet</c> every time you wrap a mutable <c>Set</c>.</p>
  /// </summary>
#if !SILVERLIGHT
  [Serializable]
#endif
  public sealed class ImmutableSet<T> : Set<T>
  {
    private const string ERROR_MESSAGE = "Object is immutable.";
        private ISet<T> mBasisSet;

        internal ISet<T> BasisSet
    {
      get
      {
        return mBasisSet;
      }
    }

        public override bool IsReadOnly
        {
            get
            {
                return true;
            }
        }
    /// <summary>
    /// Constructs an immutable (read-only) <c>Set</c> wrapper.
    /// </summary>
    /// <param name="basisSet">The <c>Set</c> that is wrapped.</param>
        public ImmutableSet( ISet<T> basisSet )
    {
      mBasisSet = basisSet;
    }

    /// <summary>
    /// Adds the specified element to this set if it is not already present.
    /// </summary>
    /// <param name="o">The object to add to the set.</param>
    /// <returns><c>true</c> is the object was added, <c>false</c> if it was already present.</returns>
    public sealed override bool Add(T o)
    {
      throw new NotSupportedException(ERROR_MESSAGE);
    }

    /// <summary>
    /// Adds all the elements in the specified collection to the set if they are not already present.
    /// </summary>
    /// <param name="c">A collection of objects to add to the set.</param>
    /// <returns><c>true</c> is the set changed as a result of this operation, <c>false</c> if not.</returns>
        public sealed override bool AddAll( ICollection<T> c )
    {
      throw new NotSupportedException(ERROR_MESSAGE);
    }

    /// <summary>
    /// Removes all objects from the set.
    /// </summary>
    public sealed override void Clear()
    {
      throw new NotSupportedException(ERROR_MESSAGE);
    }

    /// <summary>
    /// Returns <c>true</c> if this set contains the specified element.
    /// </summary>
    /// <param name="o">The element to look for.</param>
    /// <returns><c>true</c> if this set contains the specified element, <c>false</c> otherwise.</returns>
    public sealed override bool Contains(T o)
    {
      return mBasisSet.Contains(o);
    }

    /// <summary>
    /// Returns <c>true</c> if the set contains all the elements in the specified collection.
    /// </summary>
    /// <param name="c">A collection of objects.</param>
    /// <returns><c>true</c> if the set contains all the elements in the specified collection, <c>false</c> otherwise.</returns>
        public sealed override bool ContainsAll( ICollection<T> c )
    {
      return mBasisSet.ContainsAll(c);
    }

    /// <summary>
    /// Returns <c>true</c> if this set contains no elements.
    /// </summary>
    public sealed override bool IsEmpty
    {
      get{return mBasisSet.IsEmpty;}
    }


    /// <summary>
    /// Removes the specified element from the set.
    /// </summary>
    /// <param name="o">The element to be removed.</param>
    /// <returns><c>true</c> if the set contained the specified element, <c>false</c> otherwise.</returns>
    public sealed override bool Remove(T o)
    {
      throw new NotSupportedException(ERROR_MESSAGE);
    }

    /// <summary>
    /// Remove all the specified elements from this set, if they exist in this set.
    /// </summary>
    /// <param name="c">A collection of elements to remove.</param>
    /// <returns><c>true</c> if the set was modified as a result of this operation.</returns>
        public sealed override bool RemoveAll( ICollection<T> c )
    {
      throw new NotSupportedException(ERROR_MESSAGE);
    }

    /// <summary>
    /// Retains only the elements in this set that are contained in the specified collection.
    /// </summary>
    /// <param name="c">Collection that defines the set of elements to be retained.</param>
    /// <returns><c>true</c> if this set changed as a result of this operation.</returns>
        public sealed override bool RetainAll( ICollection<T> c )
    {
      throw new NotSupportedException(ERROR_MESSAGE);
    }

    /// <summary>
    /// Copies the elements in the <c>Set</c> to an array.  The type of array needs
    /// to be compatible with the objects in the <c>Set</c>, obviously.
    /// </summary>
    /// <param name="array">An array that will be the target of the copy operation.</param>
    /// <param name="index">The zero-based index where copying will start.</param>
    public sealed override void CopyTo(T[] array, int index)
    {
      mBasisSet.CopyTo(array, index);
    }

    /// <summary>
    /// The number of elements contained in this collection.
    /// </summary>
    public sealed override int Count
    {
      get{return mBasisSet.Count;}
    }

    /// <summary>
    /// Gets an enumerator for the elements in the <c>Set</c>.
    /// </summary>
    /// <returns>An <c>IEnumerator</c> over the elements in the <c>Set</c>.</returns>
        public sealed override IEnumerator<T> GetEnumerator()
    {
      return mBasisSet.GetEnumerator();
    }

    /// <summary>
    /// Returns a clone of the <c>Set</c> instance.  
    /// </summary>
    /// <returns>A clone of this object.</returns>
        public sealed override ISet<T> Clone()
    {
      return new ImmutableSet<T>(mBasisSet);
    }

    /// <summary>
    /// Performs a "union" of the two sets, where all the elements
    /// in both sets are present.  That is, the element is included if it is in either <c>a</c> or <c>b</c>.
    /// Neither this set nor the input set are modified during the operation.  The return value
    /// is a <c>Clone()</c> of this set with the extra elements added in.
    /// </summary>
    /// <param name="a">A collection of elements.</param>
    /// <returns>A new <c>Set</c> containing the union of this <c>Set</c> with the specified collection.
    /// Neither of the input objects is modified by the union.</returns>
        public sealed override ISet<T> Union( ISet<T> a )
    {
            ISet<T> m = unwrap( this );
            return new ImmutableSet<T>( m.Union( a ) );
    }

    /// <summary>
    /// Performs an "intersection" of the two sets, where only the elements
    /// that are present in both sets remain.  That is, the element is included if it exists in
    /// both sets.  The <c>Intersect()</c> operation does not modify the input sets.  It returns
    /// a <c>Clone()</c> of this set with the appropriate elements removed.
    /// </summary>
    /// <param name="a">A set of elements.</param>
    /// <returns>The intersection of this set with <c>a</c>.</returns>
        public sealed override ISet<T> Intersect( ISet<T> a )
    {
            ISet<T> m = unwrap( this );
            return new ImmutableSet<T>( m.Intersect( a ) );
    }

    /// <summary>
    /// Performs a "minus" of set <c>b</c> from set <c>a</c>.  This returns a set of all
    /// the elements in set <c>a</c>, removing the elements that are also in set <c>b</c>.
    /// The original sets are not modified during this operation.  The result set is a <c>Clone()</c>
    /// of this <c>Set</c> containing the elements from the operation.
    /// </summary>
    /// <param name="a">A set of elements.</param>
    /// <returns>A set containing the elements from this set with the elements in <c>a</c> removed.</returns>
        public sealed override ISet<T> Minus( ISet<T> a )
    {
            ISet<T> m = unwrap( this );
            return new ImmutableSet<T>( m.Minus( a ) );
    }

    /// <summary>
    /// Performs an "exclusive-or" of the two sets, keeping only the elements that
    /// are in one of the sets, but not in both.  The original sets are not modified
    /// during this operation.  The result set is a <c>Clone()</c> of this set containing
    /// the elements from the exclusive-or operation.
    /// </summary>
    /// <param name="a">A set of elements.</param>
    /// <returns>A set containing the result of <c>a ^ b</c>.</returns>
        public sealed override ISet<T> ExclusiveOr( ISet<T> a )
    {
            ISet<T> m = unwrap( this );
            return new ImmutableSet<T>( m.ExclusiveOr( a ) );
    }

        private static ISet<T> unwrap( ImmutableSet<T> set )
        {
            ISet<T> m = set;
            while ( m is ImmutableSet<T> )
                m = ( (ImmutableSet<T>)m ).BasisSet;
            return m;
        }

        public sealed override bool IsSynchronized
        {
            get
            {
                Set<T> set = this.mBasisSet as Set<T>;
                if (set != null)
                    return set.IsSynchronized;
                else
                    throw new NotSupportedException();
            }
        }

        public sealed override object SyncRoot
        {
            get
            {

                Set<T> set = this.mBasisSet as Set<T>;
                if (set != null)
                    return set.SyncRoot;
                else
                    throw new NotSupportedException();
               
            }
        }

        
  }
}
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