eina/hash - Add example that demonstrate many ways of deleting items.

git-svn-id: svn+ssh://svn.enlightenment.org/var/svn/e/trunk/eina@61093 7cbeb6ba-43b4-40fd-8cce-4c39aea84d33

diff --git a/src/examples/Makefile.am b/src/examples/Makefile.am
index cd185bc..9feb138 100644 (file)
--- a/src/examples/Makefile.am
+++ b/src/examples/Makefile.am
@@ -23,6 +23,7 @@ SRCS = \
        eina_hash_05.c \
        eina_hash_06.c \
        eina_hash_07.c \
+       eina_hash_08.c \
        eina_iterator_01.c \
        eina_list_01.c \
        eina_list_02.c \
@@ -58,6 +59,7 @@ pkglib_PROGRAMS += \
        eina_hash_05 \
        eina_hash_06 \
        eina_hash_07 \
+       eina_hash_08 \
        eina_iterator_01 \
        eina_list_01 \
        eina_list_02 \

diff --git a/src/examples/eina_hash_08.c b/src/examples/eina_hash_08.c
new file mode 100644 (file)
index 0000000..368a2fb
--- /dev/null
+++ b/src/examples/eina_hash_08.c
@@ -0,0 +1,125 @@
+#include <stdio.h>
+#include <string.h>
+#include <Eina.h>
+
+/*
+ * Eina Hash - phonebook
+ *
+ * This example demonstrate the use of Eina Hash by implementing a phonebook
+ * that stores its contact data into the hash.
+ *
+ * It indexes the phone numbers by Contact Full Name, so it's a hash with
+ * string keys.
+ */
+
+struct _Phone_Entry {
+     const char *name; // Full name.
+     const char *number; // Phone number.
+};
+
+typedef struct _Phone_Entry Phone_Entry;
+
+static Phone_Entry _start_entries[] = {
+       { "Wolfgang Amadeus Mozart", "+01 23 456-78910" },
+       { "Ludwig van Beethoven", "+12 34 567-89101" },
+       { "Richard Georg Strauss", "+23 45 678-91012" },
+       { "Heitor Villa-Lobos", "+34 56 789-10123" },
+       { NULL, NULL }
+}; // _start_entries
+
+static void
+_phone_entry_free_cb(void *data)
+{
+   free(data);
+}
+
+static Eina_Bool
+_phone_book_foreach_cb(const Eina_Hash *phone_book, const void *key,
+                      void *data, void *fdata)
+{
+   const char *name = key;
+   const char *number = data;
+   printf("%s: %s\n", name, number);
+
+   // Return EINA_FALSE to stop this callback from being called
+   return EINA_TRUE;
+}
+
+int
+main(int argc, const char *argv[])
+{
+   Eina_Hash *phone_book = NULL;
+   int i;
+   const char *entry_name = "Heitor Villa-Lobos";
+   int entry_size;
+   const char *saved_entry_name = "Alceu Valenca";
+   int saved_entry_size = sizeof("Alceu Valenca");
+   const char *phone = NULL;
+   Eina_Bool r;
+   Eina_Iterator *it;
+   void *data;
+
+   eina_init();
+
+   phone_book = eina_hash_string_superfast_new(_phone_entry_free_cb);
+
+   // Add initial entries to our hash
+   for (i = 0; _start_entries[i].name != NULL; i++)
+     {
+       eina_hash_add(phone_book, _start_entries[i].name,
+                     strdup(_start_entries[i].number));
+     }
+
+   // Delete entries
+   r = eina_hash_del(phone_book, entry_name, NULL);
+   printf("Hash entry successfully deleted? %d\n\n", r);
+
+   int hash = eina_hash_superfast("Ludwig van Beethoven",
+                                 sizeof("Ludwig van Beethoven"));
+
+   r = eina_hash_del_by_key_hash(phone_book, "Ludwig van Beethoven",
+                                sizeof("Ludwig van Beethoven"), hash);
+   printf("Hash entry successfully deleted? %d\n\n", r);
+
+   r = eina_hash_del_by_key(phone_book, "Richard Georg Strauss");
+   printf("Hash entry successfully deleted? %d\n\n", r);
+
+   // add entry by hash
+   entry_name = "Raul_Seixas";
+   entry_size = sizeof("Raul Seixas");
+   phone = strdup("+33 33 333-33333");
+   hash = eina_hash_superfast(entry_name, entry_size);
+   eina_hash_add_by_hash(phone_book, entry_name, entry_size, hash, phone);
+
+   // don't need to free 'phone' after the next del:
+   r = eina_hash_del_by_data(phone_book, phone);
+   printf("Hash entry successfully deleted? %d\n\n", r);
+
+   // add entry by hash directly - no copy of the key will be done
+   hash = eina_hash_superfast(saved_entry_name, saved_entry_size);
+   phone = strdup("+44 44 444-44444");
+   eina_hash_direct_add_by_hash(phone_book, saved_entry_name,
+                               saved_entry_size, hash, phone);
+
+   // find the added entry by its hash:
+   phone = eina_hash_find_by_hash(phone_book, saved_entry_name,
+                                 saved_entry_size, hash);
+   if (phone)
+     {
+       char *newphone = strdup("+55 55 555-55555");
+       phone = eina_hash_modify_by_hash(phone_book, saved_entry_name,
+                                        saved_entry_size, hash, newphone);
+       if (phone)
+         printf("changing phone to %s, old one was %s\n", newphone, phone);
+       else
+         printf("couldn't modify entry identified by %d\n", hash);
+     }
+   else
+     {
+       printf("couldn't find entry identified by %d\n", hash);
+     }
+
+   eina_hash_free(phone_book);
+
+   eina_shutdown();
+}