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/*
*
* Copyright 2015 gRPC 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.
*
*/
#ifndef GRPC_SUPPORT_AVL_H
#define GRPC_SUPPORT_AVL_H
#include <grpc/support/sync.h>
#ifdef __cplusplus
extern "C" {
#endif
/** internal node of an AVL tree */
typedef struct gpr_avl_node {
gpr_refcount refs;
void* key;
void* value;
struct gpr_avl_node* left;
struct gpr_avl_node* right;
long height;
} gpr_avl_node;
/** vtable for the AVL tree
* The optional user_data is propagated from the top level gpr_avl_XXX API.
* From the same API call, multiple vtable functions may be called multiple
* times.
*/
typedef struct gpr_avl_vtable {
/** destroy a key */
void (*destroy_key)(void* key, void* user_data);
/** copy a key, returning new value */
void* (*copy_key)(void* key, void* user_data);
/** compare key1, key2; return <0 if key1 < key2,
>0 if key1 > key2, 0 if key1 == key2 */
long (*compare_keys)(void* key1, void* key2, void* user_data);
/** destroy a value */
void (*destroy_value)(void* value, void* user_data);
/** copy a value */
void* (*copy_value)(void* value, void* user_data);
} gpr_avl_vtable;
/** "pointer" to an AVL tree - this is a reference
counted object - use gpr_avl_ref to add a reference,
gpr_avl_unref when done with a reference */
typedef struct gpr_avl {
const gpr_avl_vtable* vtable;
gpr_avl_node* root;
} gpr_avl;
/** Create an immutable AVL tree. */
GPRAPI gpr_avl gpr_avl_create(const gpr_avl_vtable* vtable);
/** Add a reference to an existing tree - returns
the tree as a convenience. The optional user_data will be passed to vtable
functions. */
GPRAPI gpr_avl gpr_avl_ref(gpr_avl avl, void* user_data);
/** Remove a reference to a tree - destroying it if there
are no references left. The optional user_data will be passed to vtable
functions. */
GPRAPI void gpr_avl_unref(gpr_avl avl, void* user_data);
/** Return a new tree with (key, value) added to avl.
implicitly unrefs avl to allow easy chaining.
if key exists in avl, the new tree's key entry updated
(i.e. a duplicate is not created). The optional user_data will be passed to
vtable functions. */
GPRAPI gpr_avl gpr_avl_add(gpr_avl avl, void* key, void* value,
void* user_data);
/** Return a new tree with key deleted
implicitly unrefs avl to allow easy chaining. The optional user_data will be
passed to vtable functions. */
GPRAPI gpr_avl gpr_avl_remove(gpr_avl avl, void* key, void* user_data);
/** Lookup key, and return the associated value.
Does not mutate avl.
Returns NULL if key is not found. The optional user_data will be passed to
vtable functions.*/
GPRAPI void* gpr_avl_get(gpr_avl avl, void* key, void* user_data);
/** Return 1 if avl contains key, 0 otherwise; if it has the key, sets *value to
its value. THe optional user_data will be passed to vtable functions. */
GPRAPI int gpr_avl_maybe_get(gpr_avl avl, void* key, void** value,
void* user_data);
/** Return 1 if avl is empty, 0 otherwise */
GPRAPI int gpr_avl_is_empty(gpr_avl avl);
#ifdef __cplusplus
}
#endif
#endif /* GRPC_SUPPORT_AVL_H */
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