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/*
* Copyright 2019 by its authors. See AUTHORS.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma warning disable 1591
using System;
using System.Runtime.InteropServices;
using System.Collections.Generic;
using System.ComponentModel;
using static Eina.TraitFunctions;
using static Eina.IteratorNativeFunctions;
namespace Eina
{
[EditorBrowsable(EditorBrowsableState.Never)]
public static class IteratorNativeFunctions
{
[DllImport(efl.Libs.Eina)] internal static extern void
eina_iterator_free(IntPtr iterator);
[DllImport(efl.Libs.Eina)] internal static extern IntPtr
eina_iterator_container_get(IntPtr iterator);
[DllImport(efl.Libs.Eina)] [return: MarshalAs(UnmanagedType.U1)] internal static extern bool
eina_iterator_next(IntPtr iterator, out IntPtr data);
[DllImport(efl.Libs.Eina)] internal static extern void
eina_iterator_foreach(IntPtr iterator, IntPtr callback, IntPtr fdata);
[DllImport(efl.Libs.Eina)] [return: MarshalAs(UnmanagedType.U1)] internal static extern bool
eina_iterator_lock(IntPtr iterator);
[DllImport(efl.Libs.Eina)] [return: MarshalAs(UnmanagedType.U1)] internal static extern bool
eina_iterator_unlock(IntPtr iterator);
[DllImport(efl.Libs.Eina)] internal static extern IntPtr
eina_carray_iterator_new(IntPtr array);
}
/// <summary>Wrapper around a native Eina iterator.
/// <para>Since EFL 1.23.</para>
/// </summary>
public class Iterator<T> : IEnumerable<T>, IDisposable
{
[EditorBrowsable(EditorBrowsableState.Never)]
public IntPtr Handle {get;set;} = IntPtr.Zero;
/// <summary>Whether this wrapper owns the native iterator.
/// <para>Since EFL 1.23.</para>
/// </summary>
public bool Own {get;set;} = true;
[EditorBrowsable(EditorBrowsableState.Never)]
public Iterator(IntPtr handle, bool own)
{
Handle = handle;
Own = own;
}
/// <summary>
/// Finalizer to be called from the Garbage Collector.
/// <para>Since EFL 1.23.</para>
/// </summary>
~Iterator()
{
Dispose(false);
}
/// <summary>Disposes of this wrapper, releasing the native array if owned.
/// <para>Since EFL 1.23.</para>
/// </summary>
/// <param name="disposing">True if this was called from <see cref="Dispose()"/> public method. False if
/// called from the C# finalizer.</param>
protected virtual void Dispose(bool disposing)
{
var h = Handle;
Handle = IntPtr.Zero;
if (h == IntPtr.Zero)
{
return;
}
if (Own)
{
if (disposing)
{
eina_iterator_free(h);
}
else
{
Efl.Eo.Globals.ThreadSafeFreeCbExec(eina_iterator_free, h);
}
}
}
/// <summary>Releases the native resources held by this instance.
/// <para>Since EFL 1.23.</para>
/// </summary>
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
/// <summary>Releases the native resources held by this instance.
/// <para>Since EFL 1.23.</para>
/// </summary>
public void Free()
{
Dispose();
}
/// <summary>
/// Releases the native iterator.
/// <para>Since EFL 1.23.</para>
/// </summary>
/// <returns>The native array.</returns>
public IntPtr Release()
{
IntPtr h = Handle;
Handle = IntPtr.Zero;
return h;
}
/// <summary>Sets own.
/// <para>Since EFL 1.23.</para>
/// </summary>
/// <param name="own">If own the object.</param>
public void SetOwnership(bool own)
{
Own = own;
}
/// <summary>
/// Go to the next one.
/// <para>Since EFL 1.23.</para>
/// </summary>
///
public bool Next(out T res)
{
IntPtr data;
if (!eina_iterator_next(Handle, out data))
{
res = default(T);
return false;
}
res = NativeToManaged<T>(data);
return true;
}
/// <summary>
/// Locks the container of the iterator.
/// <para>Since EFL 1.23.</para>
/// </summary>
/// <returns>true on success, false otherwise.</returns>
public bool Lock()
{
return eina_iterator_lock(Handle);
}
/// <summary>
/// Unlocks the container of the iterator.
/// <para>Since EFL 1.23.</para>
/// </summary>
/// <returns>true on success, false otherwise.</returns>
public bool Unlock()
{
return eina_iterator_unlock(Handle);
}
/// <summary> Gets an Enumerator for this iterator.
/// <para>Since EFL 1.23.</para>
/// </summary>
public IEnumerator<T> GetEnumerator()
{
for (T curr; Next(out curr);)
{
yield return curr;
}
}
System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
{
return this.GetEnumerator();
}
}
}
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