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using System;
using System.Collections;
using System.Collections.Generic;
namespace Google.Protobuf.Collections
{
/// <summary>
/// The contents of a repeated field: essentially, a collection with some extra
/// restrictions (no null values) and capabilities (deep cloning and freezing).
/// </summary>
/// <typeparam name="T">The element type of the repeated field.</typeparam>
public sealed class RepeatedField<T> : IList<T>, IDeepCloneable<RepeatedField<T>>, IEquatable<RepeatedField<T>>, IFreezable
{
private static readonly T[] EmptyArray = new T[0];
private bool frozen;
private const int MinArraySize = 8;
private T[] array = EmptyArray;
private int count = 0;
/// <summary>
/// Creates a deep clone of this repeated field.
/// </summary>
/// <remarks>
/// If the field type is
/// a message type, each element is also cloned; otherwise, it is
/// assumed that the field type is primitive (including string and
/// bytes, both of which are immutable) and so a simple copy is
/// equivalent to a deep clone.
/// </remarks>
/// <returns>A deep clone of this repeated field.</returns>
public RepeatedField<T> Clone()
{
RepeatedField<T> clone = new RepeatedField<T>();
// Clone is implicitly *not* frozen, even if this object is.
if (array != EmptyArray)
{
clone.array = (T[])array.Clone();
IDeepCloneable<T>[] cloneableArray = clone.array as IDeepCloneable<T>[];
if (cloneableArray != null)
{
for (int i = 0; i < count; i++)
{
clone.array[i] = cloneableArray[i].Clone();
}
}
}
clone.count = count;
return clone;
}
public bool IsFrozen { get { return frozen; } }
public void Freeze()
{
frozen = true;
IFreezable[] freezableArray = array as IFreezable[];
if (freezableArray != null)
{
for (int i = 0; i < count; i++)
{
freezableArray[i].Freeze();
}
}
}
private void EnsureSize(int size)
{
size = Math.Max(size, MinArraySize);
if (array.Length < size)
{
int newSize = Math.Max(array.Length * 2, size);
var tmp = new T[newSize];
Array.Copy(array, 0, tmp, 0, array.Length);
array = tmp;
}
}
public void Add(T item)
{
if (item == null)
{
throw new ArgumentNullException("item");
}
this.CheckMutable();
EnsureSize(count + 1);
array[count++] = item;
}
/// <summary>
/// Hack to allow us to add enums easily... will only work with int-based types.
/// </summary>
/// <param name="readEnum"></param>
internal void AddInt32(int item)
{
this.CheckMutable();
EnsureSize(count + 1);
int[] castArray = (int[]) (object) array;
castArray[count++] = item;
}
public void Clear()
{
this.CheckMutable();
array = EmptyArray;
count = 0;
}
public bool Contains(T item)
{
return IndexOf(item) != -1;
}
public void CopyTo(T[] array, int arrayIndex)
{
Array.Copy(this.array, 0, array, arrayIndex, count);
}
public bool Remove(T item)
{
this.CheckMutable();
int index = IndexOf(item);
if (index == -1)
{
return false;
}
Array.Copy(array, index + 1, array, index, count - index - 1);
count--;
array[count] = default(T);
return true;
}
public int Count { get { return count; } }
// TODO(jonskeet): If we implement freezing, make this reflect it.
public bool IsReadOnly { get { return IsFrozen; } }
public void Add(RepeatedField<T> values)
{
if (values == null)
{
throw new ArgumentNullException("values");
}
this.CheckMutable();
EnsureSize(count + values.count);
// We know that all the values will be valid, because it's a RepeatedField.
Array.Copy(values.array, 0, array, count, values.count);
count += values.count;
}
public void Add(IEnumerable<T> values)
{
if (values == null)
{
throw new ArgumentNullException("values");
}
this.CheckMutable();
// TODO: Check for ICollection and get the Count?
foreach (T item in values)
{
Add(item);
}
}
public RepeatedField<T>.Enumerator GetEnumerator()
{
return new Enumerator(this);
}
IEnumerator<T> IEnumerable<T>.GetEnumerator()
{
return GetEnumerator();
}
public override bool Equals(object obj)
{
return Equals(obj as RepeatedField<T>);
}
IEnumerator IEnumerable.GetEnumerator()
{
return GetEnumerator();
}
/// <summary>
/// Returns an enumerator of the values in this list as integers.
/// Used for enum types.
/// </summary>
internal Int32Enumerator GetInt32Enumerator()
{
return new Int32Enumerator((int[])(object)array, count);
}
public override int GetHashCode()
{
int hash = 23;
for (int i = 0; i < count; i++)
{
hash = hash * 31 + array[i].GetHashCode();
}
return hash;
}
public bool Equals(RepeatedField<T> other)
{
if (ReferenceEquals(other, null))
{
return false;
}
if (ReferenceEquals(other, this))
{
return true;
}
if (other.Count != this.Count)
{
return false;
}
// TODO(jonskeet): Does this box for enums?
EqualityComparer<T> comparer = EqualityComparer<T>.Default;
for (int i = 0; i < count; i++)
{
if (!comparer.Equals(array[i], other.array[i]))
{
return false;
}
}
return true;
}
public int IndexOf(T item)
{
if (item == null)
{
throw new ArgumentNullException("item");
}
// TODO(jonskeet): Does this box for enums?
EqualityComparer<T> comparer = EqualityComparer<T>.Default;
for (int i = 0; i < count; i++)
{
if (comparer.Equals(array[i], item))
{
return i;
}
}
return -1;
}
public void Insert(int index, T item)
{
if (item == null)
{
throw new ArgumentNullException("item");
}
if (index < 0 || index > count)
{
throw new ArgumentOutOfRangeException("index");
}
this.CheckMutable();
EnsureSize(count + 1);
Array.Copy(array, index, array, index + 1, count - index);
count++;
}
public void RemoveAt(int index)
{
if (index < 0 || index >= count)
{
throw new ArgumentOutOfRangeException("index");
}
this.CheckMutable();
Array.Copy(array, index + 1, array, index, count - index - 1);
count--;
array[count] = default(T);
}
public T this[int index]
{
get
{
if (index < 0 || index >= count)
{
throw new ArgumentOutOfRangeException("index");
}
return array[index];
}
set
{
if (index < 0 || index >= count)
{
throw new ArgumentOutOfRangeException("index");
}
this.CheckMutable();
if (value == null)
{
throw new ArgumentNullException("value");
}
array[index] = value;
}
}
public struct Enumerator : IEnumerator<T>
{
private int index;
private readonly RepeatedField<T> field;
public Enumerator(RepeatedField<T> field)
{
this.field = field;
this.index = -1;
}
public bool MoveNext()
{
if (index + 1 >= field.Count)
{
return false;
}
index++;
return true;
}
public void Reset()
{
index = -1;
}
public T Current
{
get
{
if (index == -1 || index >= field.count)
{
throw new InvalidOperationException();
}
return field.array[index];
}
}
object IEnumerator.Current
{
get { return Current; }
}
public void Dispose()
{
}
}
internal struct Int32Enumerator : IEnumerator<int>
{
private int index;
private readonly int[] array;
private readonly int count;
public Int32Enumerator(int[] array, int count)
{
this.array = array;
this.index = -1;
this.count = count;
}
public bool MoveNext()
{
if (index + 1 >= count)
{
return false;
}
index++;
return true;
}
public void Reset()
{
index = -1;
}
// No guard here, as we're only going to use this internally...
public int Current { get { return array[index]; } }
object IEnumerator.Current
{
get { return Current; }
}
public void Dispose()
{
}
}
}
}
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