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/* functions.vala
*
* Copyright (C) 2009 Didier Villevalois, Maciej Piechotka
*
* 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:
* Didier 'Ptitjes' Villevalois <ptitjes@free.fr>
* Maciej Piechotka <uzytkownik2@gmail.com>
*/
using GLib;
namespace Gee {
/**
* Helpers for equal, hash and compare functions.
*
* With those functions, you can retrieve the equal, hash and compare
* functions that best match your element, key or value types. Supported
* types are (non-boxed) primitive, string and ``Object`` types.
*
* A special care is taken for classes inheriting from the
* {@link Comparable} interface. For such types, an appropriate compare
* function is returned that calls {@link Comparable.compare_to}.
*
*/
namespace Functions {
/**
* Get a equality testing function for a given type.
*
* @param t the type which to get an equality testing function for.
*
* @return the equality testing function corresponding to the given type.
*/
public static EqualDataFunc get_equal_func_for (Type t) {
if (t == typeof (string)) {
return (a, b) => {
if (a == b)
return true;
else if (a == null || b == null)
return false;
else
return str_equal ((string) a, (string) b);
};
} else if (t.is_a (typeof (Hashable))) {
return (a, b) => {
if (a == b)
return true;
else if (a == null || b == null)
return false;
else
return ((Hashable<Hashable>) a).equal_to ((Hashable) b);
};
} else if (t.is_a (typeof (Comparable))) {
return (a, b) => {
if (a == b)
return true;
else if (a == null || b == null)
return false;
else
return ((Comparable<Comparable>) a).compare_to ((Comparable) b) == 0;};
} else {
return (a, b) => {return direct_equal (a, b);};
}
}
/**
* Get a hash function for a given type.
*
* @param t the type which to get the hash function for.
*
* @return the hash function corresponding to the given type.
*/
public static HashDataFunc get_hash_func_for (Type t) {
if (t == typeof (string)) {
return (a) => {
if (a == null)
return (uint)0xdeadbeef;
else
return str_hash ((string) a);
};
} else if (t.is_a (typeof (Hashable))) {
return (a) => {
if (a == null)
return (uint)0xdeadbeef;
else
return ((Hashable) a).hash();
};
} else {
return (a) => {return direct_hash (a);};
}
}
/**
* Get a comparator function for a given type.
*
* @param t the type which to get a comparator function for.
*
* @return the comparator function corresponding to the given type.
*/
public static CompareDataFunc get_compare_func_for (Type t) {
if (t == typeof (string)) {
return (a, b) => {
if (a == b)
return 0;
else if (a == null)
return -1;
else if (b == null)
return 1;
else
return strcmp((string) a, (string) b);
};
} else if (t.is_a (typeof (Comparable))) {
return (a, b) => {
if (a == b)
return 0;
else if (a == null)
return -1;
else if (b == null)
return 1;
else
return ((Comparable<Comparable>) a).compare_to ((Comparable) b);
};
} else {
return (_val1, _val2) => {
long val1 = (long)_val1, val2 = (long)_val2;
if (val1 > val2) {
return 1;
} else if (val1 == val2) {
return 0;
} else {
return -1;
}
};
}
}
}
}
|
