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/* collection.vala
*
* Copyright (C) 2007 Jürg Billeter
*
* 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 library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Author:
* Jürg Billeter <j@bitron.ch>
*/
/**
* Serves as the base interface for implementing collection classes. Defines
* size, iteration, and modification methods.
*/
public abstract class Vala.Collection<G> : Iterable<G> {
/**
* The number of items in this collection.
*/
public abstract int size { get; }
/**
* Specifies whether this collection is empty.
*/
public virtual bool is_empty { get { return size == 0; } }
/**
* Determines whether this collection contains the specified item.
*
* @param item the item to locate in the collection
*
* @return true if item is found, false otherwise
*/
public abstract bool contains (G item);
/**
* Adds an item to this collection. Must not be called on read-only
* collections.
*
* @param item the item to add to the collection
*
* @return true if the collection has been changed, false otherwise
*/
public abstract bool add (G item);
/**
* Removes the first occurrence of an item from this collection. Must not
* be called on read-only collections.
*
* @param item the item to remove from the collection
*
* @return true if the collection has been changed, false otherwise
*/
public abstract bool remove (G item);
/**
* Removes all items from this collection. Must not be called on
* read-only collections.
*/
public abstract void clear ();
/**
* Adds all items in the input collection to this collection.
*
* @param collection the collection which items will be added to this
* collection.
*
* @return ``true`` if the collection has been changed, ``false`` otherwise
*/
public virtual bool add_all (Collection<G> collection) {
bool changed = false;
for (Iterator<G> iter = collection.iterator (); iter.next ();) {
G item = iter.get ();
if (!contains (item)) {
add (item);
changed = true;
}
}
return changed;
}
/**
* Returns an array containing all of items from this collection.
*
* @return an array containing all of items from this collection
*/
public virtual G[] to_array () {
var t = typeof (G);
if (t == typeof (bool)) {
return (G[]) to_bool_array ((Collection<bool>) this);
} else if (t == typeof (char)) {
return (G[]) to_char_array ((Collection<char>) this);
} else if (t == typeof (uchar)) {
return (G[]) to_uchar_array ((Collection<uchar>) this);
} else if (t == typeof (int)) {
return (G[]) to_int_array ((Collection<int>) this);
} else if (t == typeof (uint)) {
return (G[]) to_uint_array ((Collection<uint>) this);
} else if (t == typeof (int64)) {
return (G[]) to_int64_array ((Collection<int64?>) this);
} else if (t == typeof (uint64)) {
return (G[]) to_uint64_array ((Collection<uint64?>) this);
} else if (t == typeof (long)) {
return (G[]) to_long_array ((Collection<long>) this);
} else if (t == typeof (ulong)) {
return (G[]) to_ulong_array ((Collection<ulong>) this);
} else if (t == typeof (float)) {
return (G[]) to_float_array ((Collection<float?>) this);
} else if (t == typeof (double)) {
return (G[]) to_double_array ((Collection<double?>) this);
} else if (t.is_enum () || t.is_flags ()) {
return (G[]) to_int_array ((Collection<int>) this);
} else {
G[] array = new G[size];
int index = 0;
foreach (G element in this) {
array[index++] = (owned)element;
}
return array;
}
}
private static bool[] to_bool_array (Collection<bool> coll) {
bool[] array = new bool[coll.size];
int index = 0;
foreach (bool element in coll) {
array[index++] = element;
}
return array;
}
private static char[] to_char_array (Collection<char> coll) {
char[] array = new char[coll.size];
int index = 0;
foreach (char element in coll) {
array[index++] = element;
}
return array;
}
private static uchar[] to_uchar_array (Collection<uchar> coll) {
uchar[] array = new uchar[coll.size];
int index = 0;
foreach (uchar element in coll) {
array[index++] = element;
}
return array;
}
private static int[] to_int_array (Collection<int> coll) {
int[] array = new int[coll.size];
int index = 0;
foreach (int element in coll) {
array[index++] = element;
}
return array;
}
private static uint[] to_uint_array (Collection<uint> coll) {
uint[] array = new uint[coll.size];
int index = 0;
foreach (uint element in coll) {
array[index++] = element;
}
return array;
}
private static int64?[] to_int64_array (Collection<int64?> coll) {
int64?[] array = new int64?[coll.size];
int index = 0;
foreach (int64? element in coll) {
array[index++] = (owned)element;
}
return array;
}
private static uint64?[] to_uint64_array (Collection<uint64?> coll) {
uint64?[] array = new uint64?[coll.size];
int index = 0;
foreach (uint64? element in coll) {
array[index++] = (owned)element;
}
return array;
}
private static long[] to_long_array (Collection<long> coll) {
long[] array = new long[coll.size];
int index = 0;
foreach (long element in coll) {
array[index++] = element;
}
return array;
}
private static ulong[] to_ulong_array (Collection<ulong> coll) {
ulong[] array = new ulong[coll.size];
int index = 0;
foreach (ulong element in coll) {
array[index++] = element;
}
return array;
}
private static float?[] to_float_array (Collection<float?> coll) {
float?[] array = new float?[coll.size];
int index = 0;
foreach (float? element in coll) {
array[index++] = (owned)element;
}
return array;
}
private static double?[] to_double_array (Collection<double?> coll) {
double?[] array = new double?[coll.size];
int index = 0;
foreach (double? element in coll) {
array[index++] = (owned)element;
}
return array;
}
}
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