Class CharArraySet

A simple class that stores System.Strings as char[]'s in a hash table. Note that this is not a general purpose class. For example, it cannot remove items from the set, nor does it resize its hash table to be smaller, etc. It is designed to be quick to test if a char[] is in the set without the necessity of converting it to a System.String first.

You must specify the required Lucene.Net.Util.LuceneVersion compatibility when creating CharArraySet:

  • As of 3.1, supplementary characters are properly lowercased.
Before 3.1 supplementary characters could not be lowercased correctly due to the lack of Unicode 4 support in JDK 1.4. To use instances of CharArraySet with the behavior before Lucene 3.1 pass a Lucene.Net.Util.LuceneVersion to the constructors.

Please note: This class implements System.Collections.Generic.ISet<T> but does not behave like it should in all cases. The generic type is System.String, because you can add any object to it, that has a string representation (which is converted to a string). The add methods will use System.Object.ToString() and store the result using a char[] buffer. The same behavior have the Contains(String) methods. The GetEnumerator() returns an IEnumerator{char[]}

Inheritance
System.Object
CharArraySet
Implements
System.Collections.Generic.ISet<System.String>
System.Collections.Generic.ICollection<System.String>
System.Collections.Generic.IEnumerable<System.String>
System.Collections.IEnumerable
Inherited Members
System.Object.Equals(System.Object, System.Object)
System.Object.GetType()
System.Object.MemberwiseClone()
System.Object.ReferenceEquals(System.Object, System.Object)
Namespace: Lucene.Net.Analysis.Util
Assembly: Lucene.Net.Analysis.Common.dll
Syntax
public class CharArraySet : ISet<string>, ICollection<string>, IEnumerable<string>, IEnumerable

Constructors

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CharArraySet(LuceneVersion, ICollection<String>, Boolean)

Creates a set from a collection of objects.

Declaration
public CharArraySet(LuceneVersion matchVersion, ICollection<string> c, bool ignoreCase)
Parameters
Type Name Description
Lucene.Net.Util.LuceneVersion matchVersion

compatibility match version see CharArraySet for details.

System.Collections.Generic.ICollection<System.String> c

a collection whose elements to be placed into the set

System.Boolean ignoreCase

false if and only if the set should be case sensitive otherwise true.

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CharArraySet(LuceneVersion, Int32, Boolean)

Create set with enough capacity to hold startSize terms

Declaration
public CharArraySet(LuceneVersion matchVersion, int startSize, bool ignoreCase)
Parameters
Type Name Description
Lucene.Net.Util.LuceneVersion matchVersion

compatibility match version see CharArraySet for details.

System.Int32 startSize

the initial capacity

System.Boolean ignoreCase

false if and only if the set should be case sensitive otherwise true.

Fields

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EMPTY_SET

Declaration
public static readonly CharArraySet EMPTY_SET
Field Value
Type Description
CharArraySet

Properties

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Count

Gets the number of elements contained in the CharArraySet.

Declaration
public virtual int Count { get; }
Property Value
Type Description
System.Int32
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IsReadOnly

true if the CharArraySet is read-only; otherwise false.

Declaration
public virtual bool IsReadOnly { get; }
Property Value
Type Description
System.Boolean

Methods

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Add(ICharSequence)

Add this J2N.Text.ICharSequence into the set

Declaration
public virtual bool Add(ICharSequence text)
Parameters
Type Name Description
J2N.Text.ICharSequence text
Returns
Type Description
System.Boolean

true if text was added to the set; false if it already existed prior to this call
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Add(Char[])

Add this char[] directly to the set. If ignoreCase is true for this CharArraySet, the text array will be directly modified. The user should never modify this text array after calling this method.

Declaration
public virtual bool Add(char[] text)
Parameters
Type Name Description
System.Char[] text
Returns
Type Description
System.Boolean

true if text was added to the set; false if it already existed prior to this call
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Add(Object)

Add the System.Object.ToString() representation of o into the set. The System.Object.ToString() method is called after setting the thread to System.Globalization.CultureInfo.InvariantCulture. If the type of o is a value type, it will be converted using the System.Globalization.CultureInfo.InvariantCulture.

Declaration
public virtual bool Add(object o)
Parameters
Type Name Description
System.Object o

A string-able object
Returns
Type Description
System.Boolean

true if o was added to the set; false if it already existed prior to this call
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Add(String)

Add this System.String into the set

Declaration
public virtual bool Add(string text)
Parameters
Type Name Description
System.String text
Returns
Type Description
System.Boolean

true if text was added to the set; false if it already existed prior to this call
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Clear()

Clears all entries in this set. This method is supported for reusing, but not ICollection{string}.Remove(string).

Declaration
public virtual void Clear()
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Contains(ICharSequence)

true if the J2N.Text.ICharSequence is in the set

Declaration
public virtual bool Contains(ICharSequence cs)
Parameters
Type Name Description
J2N.Text.ICharSequence cs
Returns
Type Description
System.Boolean
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Contains(Char[])

true if the char[]s are in the set

Declaration
public virtual bool Contains(char[] text)
Parameters
Type Name Description
System.Char[] text
Returns
Type Description
System.Boolean
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Contains(Char[], Int32, Int32)

true if the length chars of text starting at offset are in the set

Declaration
public virtual bool Contains(char[] text, int offset, int length)
Parameters
Type Name Description
System.Char[] text
System.Int32 offset
System.Int32 length
Returns
Type Description
System.Boolean
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Contains(Object)

true if the System.Object.ToString() representation of o is in the set

Declaration
public virtual bool Contains(object o)
Parameters
Type Name Description
System.Object o
Returns
Type Description
System.Boolean
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Contains(String)

true if the System.String is in the set

Declaration
public virtual bool Contains(string cs)
Parameters
Type Name Description
System.String cs
Returns
Type Description
System.Boolean
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ContainsAll(IEnumerable<String>)

Returns true if this collection contains all of the elements in the specified collection.

Declaration
public virtual bool ContainsAll(IEnumerable<string> other)
Parameters
Type Name Description
System.Collections.Generic.IEnumerable<System.String> other

collection to be checked for containment in this collection
Returns
Type Description
System.Boolean

true if this CharArraySet contains all of the elements in the specified collection; otherwise, false.
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ContainsAll<T>(IEnumerable<T>)

Returns true if this collection contains all of the elements in the specified collection.

Declaration
public virtual bool ContainsAll<T>(IEnumerable<T> other)
Parameters
Type Name Description
System.Collections.Generic.IEnumerable<T> other

collection to be checked for containment in this collection
Returns
Type Description
System.Boolean

true if this CharArraySet contains all of the elements in the specified collection; otherwise, false.
Type Parameters
Name Description
T
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Copy<T>(LuceneVersion, ICollection<T>)

Returns a copy of the given set as a CharArraySet. If the given set is a CharArraySet the ignoreCase property will be preserved.

Note: If you intend to create a copy of another CharArraySet where the Lucene.Net.Util.LuceneVersion of the source set differs from its copy CharArraySet(LuceneVersion, ICollection<String>, Boolean) should be used instead. The Copy<T>(LuceneVersion, ICollection<T>) will preserve the Lucene.Net.Util.LuceneVersion of the source set it is an instance of CharArraySet.

Declaration
public static CharArraySet Copy<T>(LuceneVersion matchVersion, ICollection<T> set)
Parameters
Type Name Description
Lucene.Net.Util.LuceneVersion matchVersion

compatibility match version. This argument will be ignored if the given set is a CharArraySet.

System.Collections.Generic.ICollection<T> set

a set to copy

Returns
Type Description
CharArraySet

a copy of the given set as a CharArraySet. If the given set is a CharArraySet the Lucene.Net.Analysis.Util.CharArrayMap`1.ignoreCase field as well as the MatchVersion will be preserved.

Type Parameters
Name Description
T
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CopyTo(String[], Int32)

Copies the entire CharArraySet to a one-dimensional string[] array, starting at the specified index of the target array.

Declaration
public void CopyTo(string[] array, int arrayIndex)
Parameters
Type Name Description
System.String[] array

The one-dimensional string[] Array that is the destination of the elements copied from CharArraySet. The Array must have zero-based indexing.
System.Int32 arrayIndex

The zero-based index in array at which copying begins.
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Equals(Object)

Compares the specified object with this set for equality. Returns true if the given object is also a set, the two sets have the same size, and every member of the given set is contained in this set. This ensures that the equals method works properly across different implementations of the ISet{string} interface.

This implementation first checks if the specified object is this set; if so it returns true. Then, it checks if the specified object is a set whose size is identical to the size of this set; if not, it returns false. If so, it uses the enumerator of this set and the specified object to determine if all of the contained values are present (using System.String.Equals(System.String)).

Declaration
public override bool Equals(object obj)
Parameters
Type Name Description
System.Object obj

object to be compared for equality with this set
Returns
Type Description
System.Boolean

true if the specified object is equal to this set
Overrides
System.Object.Equals(System.Object)
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GetEnumerator()

Returns an System.Collections.IEnumerator for char[] instances in this set.

Declaration
public virtual IEnumerator GetEnumerator()
Returns
Type Description
System.Collections.IEnumerator
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GetHashCode()

Returns the hash code value for this set. The hash code of a set is defined to be the sum of the hash codes of the elements in the set, where the hash code of a null element is defined to be zero. This ensures that s1.Equals(s2) implies that s1.GetHashCode()==s2.GetHashCode() for any two sets s1 and s2. This implementation iterates over the set, calling the GetHashCode() method on each element in the set, and adding up the results.

Declaration
public override int GetHashCode()
Returns
Type Description
System.Int32

the hash code value for this set
Overrides
System.Object.GetHashCode()
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IsProperSubsetOf(IEnumerable<String>)

Determines whether a CharArraySet object is a proper subset of the specified collection.

Declaration
public virtual bool IsProperSubsetOf(IEnumerable<string> other)
Parameters
Type Name Description
System.Collections.Generic.IEnumerable<System.String> other

The collection to compare to the current CharArraySet object.
Returns
Type Description
System.Boolean

true if this CharArraySet object is a proper subset of other; otherwise, false.
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IsProperSubsetOf<T>(IEnumerable<T>)

Determines whether a CharArraySet object is a proper subset of the specified collection.

Declaration
public virtual bool IsProperSubsetOf<T>(IEnumerable<T> other)
Parameters
Type Name Description
System.Collections.Generic.IEnumerable<T> other

The collection to compare to the current CharArraySet object.
Returns
Type Description
System.Boolean

true if this CharArraySet object is a proper subset of other; otherwise, false.
Type Parameters
Name Description
T
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IsProperSupersetOf(IEnumerable<String>)

Determines whether a CharArraySet object is a proper superset of the specified collection.

Declaration
public virtual bool IsProperSupersetOf(IEnumerable<string> other)
Parameters
Type Name Description
System.Collections.Generic.IEnumerable<System.String> other

The collection to compare to the current CharArraySet object.
Returns
Type Description
System.Boolean

true if this CharArraySet object is a proper superset of other; otherwise, false.
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IsProperSupersetOf<T>(IEnumerable<T>)

Determines whether a CharArraySet object is a proper superset of the specified collection.

Declaration
public virtual bool IsProperSupersetOf<T>(IEnumerable<T> other)
Parameters
Type Name Description
System.Collections.Generic.IEnumerable<T> other

The collection to compare to the current CharArraySet object.
Returns
Type Description
System.Boolean

true if this CharArraySet object is a proper superset of other; otherwise, false.
Type Parameters
Name Description
T
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IsSubsetOf(IEnumerable<String>)

Determines whether a CharArraySet object is a subset of the specified collection.

Declaration
public virtual bool IsSubsetOf(IEnumerable<string> other)
Parameters
Type Name Description
System.Collections.Generic.IEnumerable<System.String> other

The collection to compare to the current CharArraySet object.
Returns
Type Description
System.Boolean

true if this CharArraySet object is a subset of other; otherwise, false.
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IsSubsetOf<T>(IEnumerable<T>)

Determines whether a CharArraySet object is a subset of the specified collection.

Declaration
public virtual bool IsSubsetOf<T>(IEnumerable<T> other)
Parameters
Type Name Description
System.Collections.Generic.IEnumerable<T> other

The collection to compare to the current CharArraySet object.
Returns
Type Description
System.Boolean

true if this CharArraySet object is a subset of other; otherwise, false.
Type Parameters
Name Description
T
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IsSupersetOf(IEnumerable<String>)

Determines whether a CharArraySet object is a superset of the specified collection.

Declaration
public virtual bool IsSupersetOf(IEnumerable<string> other)
Parameters
Type Name Description
System.Collections.Generic.IEnumerable<System.String> other

The collection to compare to the current CharArraySet object.
Returns
Type Description
System.Boolean

true if this CharArraySet object is a superset of other; otherwise, false.
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IsSupersetOf<T>(IEnumerable<T>)

Determines whether a CharArraySet object is a superset of the specified collection.

Declaration
public virtual bool IsSupersetOf<T>(IEnumerable<T> other)
Parameters
Type Name Description
System.Collections.Generic.IEnumerable<T> other

The collection to compare to the current CharArraySet object.
Returns
Type Description
System.Boolean

true if this CharArraySet object is a superset of other; otherwise, false.
Type Parameters
Name Description
T
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Overlaps(IEnumerable<String>)

Determines whether the current CharArraySet object and a specified collection share common elements.

Declaration
public virtual bool Overlaps(IEnumerable<string> other)
Parameters
Type Name Description
System.Collections.Generic.IEnumerable<System.String> other

The collection to compare to the current CharArraySet object.
Returns
Type Description
System.Boolean

true if the CharArraySet object and other share at least one common element; otherwise, false.
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Overlaps<T>(IEnumerable<T>)

Determines whether the current CharArraySet object and a specified collection share common elements.

Declaration
public virtual bool Overlaps<T>(IEnumerable<T> other)
Parameters
Type Name Description
System.Collections.Generic.IEnumerable<T> other

The collection to compare to the current CharArraySet object.
Returns
Type Description
System.Boolean

true if this CharArraySet object and other share at least one common element; otherwise, false.
Type Parameters
Name Description
T
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SetEquals(IEnumerable<String>)

Determines whether the current set and the specified collection contain the same elements.

Declaration
public virtual bool SetEquals(IEnumerable<string> other)
Parameters
Type Name Description
System.Collections.Generic.IEnumerable<System.String> other

The collection to compare to the current set.
Returns
Type Description
System.Boolean

true if the current set is equal to other; otherwise, false.
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ToString()

Returns a string that represents the current object. (Inherited from System.Object.)

Declaration
public override string ToString()
Returns
Type Description
System.String
Overrides
System.Object.ToString()
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UnionWith(IEnumerable<ICharSequence>)

Modifies the current CharArraySet to contain all elements that are present in itself, the specified collection, or both.

Declaration
public virtual bool UnionWith(IEnumerable<ICharSequence> other)
Parameters
Type Name Description
System.Collections.Generic.IEnumerable<J2N.Text.ICharSequence> other

The collection whose elements should be merged into the CharArraySet.
Returns
Type Description
System.Boolean

true if this CharArraySet changed as a result of the call
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UnionWith(IEnumerable<Char[]>)

Modifies the current CharArraySet to contain all elements that are present in itself, the specified collection, or both.

Declaration
public virtual bool UnionWith(IEnumerable<char[]> other)
Parameters
Type Name Description
System.Collections.Generic.IEnumerable<System.Char[]> other

The collection whose elements should be merged into the CharArraySet.
Returns
Type Description
System.Boolean

true if this CharArraySet changed as a result of the call
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UnionWith(IEnumerable<String>)

Modifies the current CharArraySet to contain all elements that are present in itself, the specified collection, or both.

Declaration
public virtual void UnionWith(IEnumerable<string> other)
Parameters
Type Name Description
System.Collections.Generic.IEnumerable<System.String> other

The collection whose elements should be merged into the CharArraySet.
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UnionWith<T>(IEnumerable<T>)

Modifies the current CharArraySet to contain all elements that are present in itself, the specified collection, or both.

Declaration
public virtual bool UnionWith<T>(IEnumerable<T> other)
Parameters
Type Name Description
System.Collections.Generic.IEnumerable<T> other

The collection whose elements should be merged into the CharArraySet.
Returns
Type Description
System.Boolean

true if this CharArraySet changed as a result of the call
Type Parameters
Name Description
T
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UnmodifiableSet(CharArraySet)

Returns an unmodifiable CharArraySet. This allows to provide unmodifiable views of internal sets for "read-only" use.

Declaration
public static CharArraySet UnmodifiableSet(CharArraySet set)
Parameters
Type Name Description
CharArraySet set

a set for which the unmodifiable set is returned.

Returns
Type Description
CharArraySet

an new unmodifiable CharArraySet.

Exceptions
Type Condition
System.ArgumentNullException

if the given set is null.

Explicit Interface Implementations

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ICollection<String>.Add(String)

LUCENENET specific for supporting System.Collections.Generic.ICollection<T>.

Declaration
void ICollection<string>.Add(string item)
Parameters
Type Name Description
System.String item
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IEnumerable<String>.GetEnumerator()

Declaration
IEnumerator<string> IEnumerable<string>.GetEnumerator()
Returns
Type Description
System.Collections.Generic.IEnumerator<System.String>

Implements

System.Collections.Generic.ISet<T>
System.Collections.Generic.ICollection<T>
System.Collections.Generic.IEnumerable<T>
System.Collections.IEnumerable

Extension Methods