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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
#include <axiom_navigator.h>
static void
axiom_navigator_update_next_node(
axiom_navigator_t * om_navigator,
const axutil_env_t * env);
struct axiom_navigator
{
axiom_node_t *node;
axis2_bool_t visited;
axiom_node_t *next;
axiom_node_t *root;
axis2_bool_t backtracked;
axis2_bool_t end;
axis2_bool_t start;
};
AXIS2_EXTERN axiom_navigator_t *AXIS2_CALL
axiom_navigator_create(
const axutil_env_t * env,
axiom_node_t * om_node)
{
axiom_navigator_t *om_navigator = NULL;
AXIS2_ENV_CHECK(env, NULL);
AXIS2_PARAM_CHECK(env->error, om_node, NULL);
om_navigator = (axiom_navigator_t *)AXIS2_MALLOC(env->allocator, sizeof(axiom_navigator_t));
if(!om_navigator)
{
AXIS2_ERROR_SET(env->error, AXIS2_ERROR_NO_MEMORY, AXIS2_FAILURE);
return NULL;
}
om_navigator->node = NULL;
om_navigator->visited = AXIS2_FALSE;
om_navigator->next = NULL;
om_navigator->root = NULL;
om_navigator->end = AXIS2_FALSE;
om_navigator->start = AXIS2_TRUE;
om_navigator->backtracked = AXIS2_FALSE;
om_navigator->next = om_node;
om_navigator->root = om_node;
return om_navigator;
}
AXIS2_EXTERN void AXIS2_CALL
axiom_navigator_free(
axiom_navigator_t * om_navigator,
const axutil_env_t * env)
{
AXIS2_ENV_CHECK(env, AXIS2_FAILURE);
AXIS2_FREE(env->allocator, om_navigator);
return;
}
AXIS2_EXTERN axis2_bool_t AXIS2_CALL
axiom_navigator_is_navigable(
axiom_navigator_t * om_navigator,
const axutil_env_t * env)
{
if(AXIS2_TRUE == om_navigator->end)
{
return AXIS2_FALSE;
}
else
{
if(om_navigator->next)
{
return AXIS2_TRUE;
}
}
return AXIS2_FALSE;
}
AXIS2_EXTERN axis2_bool_t AXIS2_CALL
axiom_navigator_is_completed(
axiom_navigator_t * om_navigator,
const axutil_env_t * env)
{
return om_navigator->end;
}
AXIS2_EXTERN axis2_bool_t AXIS2_CALL
axiom_navigator_visited(
axiom_navigator_t * om_navigator,
const axutil_env_t * env)
{
return om_navigator->visited;
}
AXIS2_EXTERN axiom_node_t *AXIS2_CALL
axiom_navigator_next(
axiom_navigator_t * om_navigator,
const axutil_env_t * env)
{
AXIS2_ENV_CHECK(env, NULL);
if(!om_navigator->next)
{
return NULL;
}
om_navigator->node = om_navigator->next;
om_navigator->visited = om_navigator->backtracked;
om_navigator->backtracked = AXIS2_FALSE;
axiom_navigator_update_next_node(om_navigator, env);
/** set the starting and ending flags */
if(om_navigator->root == om_navigator->next)
{
if(!(om_navigator->start))
{
om_navigator->end = AXIS2_TRUE;
}
else
{
om_navigator->start = AXIS2_FALSE;
}
}
return om_navigator->node;
}
/** this method encapsulate searching logic */
static void
axiom_navigator_update_next_node(
axiom_navigator_t * om_navigator,
const axutil_env_t * env)
{
if(!om_navigator)
{
return;
}
if(!om_navigator->next)
{
return;
}
if((AXIOM_ELEMENT == axiom_node_get_node_type(om_navigator->next, env))
&& !(om_navigator->visited))
{
if(axiom_node_get_first_child(om_navigator->next, env))
{
om_navigator->next = axiom_node_get_first_child(om_navigator->next, env);
}
else if(AXIS2_TRUE == axiom_node_is_complete(om_navigator->next, env))
{
om_navigator->backtracked = AXIS2_TRUE;
}
else
{
om_navigator->next = NULL;
}
}
else
{
axiom_node_t *parent = NULL;
axiom_node_t *next_sibling = NULL;
next_sibling = axiom_node_get_next_sibling(om_navigator->next, env);
parent = axiom_node_get_parent(om_navigator->next, env);
if(next_sibling)
{
om_navigator->next = next_sibling;
}
else if((parent) && axiom_node_is_complete(parent, env))
{
om_navigator->next = parent;
om_navigator->backtracked = AXIS2_TRUE;
}
else
{
om_navigator->next = NULL;
}
}
}
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