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/* Copyright 2013 10gen Inc.
*
* 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.
*/
#include "mongo/util/options_parser/environment.h"
#include <boost/shared_ptr.hpp>
#include <iostream>
#include "mongo/bson/util/builder.h"
#include "mongo/util/options_parser/constraints.h"
namespace mongo {
namespace optionenvironment {
// Environment implementation
Status Environment::addKeyConstraint(KeyConstraint* c) {
keyConstraints.push_back(boost::shared_ptr<KeyConstraint>(c));
return Status::OK();
}
Status Environment::addConstraint(Constraint* c) {
constraints.push_back(boost::shared_ptr<Constraint>(c));
return Status::OK();
}
/** Get the value at Key. Note that we should not be able to add empty values to the
* environment, so we don't check for that here */
Status Environment::get(const Key& get_key, Value* get_value) const {
typedef std::map<Key, Value>::const_iterator it_type;
it_type value = values.find(get_key);
if (value == values.end()) {
value = default_values.find(get_key);
if (value == default_values.end()) {
StringBuilder sb;
sb << "Value not found for key: " << get_key;
return Status(ErrorCodes::NoSuchKey, sb.str());
}
}
*get_value = value->second;
return Status::OK();
}
/** Set the Value in our Environment. Always disallow empty values */
Status Environment::set(const Key& add_key, const Value& add_value) {
// 1. Make sure value is not empty
if (add_value.isEmpty()) {
return Status(ErrorCodes::InternalError, "Attempted to add an empty value");
}
// 2. Save old values
std::map <Key, Value> old_values = values;
// 3. Add value to be added
values[add_key] = add_value;
// 4. Validate only if our environment is already valid
if (valid) {
Status ret = validate();
if (!ret.isOK()) {
// 5. Revert to old values if this was invalid
values = old_values;
return ret;
}
}
return Status::OK();
}
/** Set the default Value for the given Key in our Environment. Always disallow empty values */
Status Environment::setDefault(const Key& add_key, const Value& add_value) {
// 1. Make sure value is not empty
if (add_value.isEmpty()) {
return Status(ErrorCodes::InternalError, "Attempted to set an empty default value");
}
// 2. Disallow modifying defaults after calling validate on this Environment
if (valid) {
return Status(ErrorCodes::InternalError,
"Attempted to set a default value after calling validate");
}
// 3. Add this value to our defaults
default_values[add_key] = add_value;
return Status::OK();
}
/** Set all the Values from the source Environment in our Environment. Does not check for empty
* values as the source Environment should not have been allowed to have any */
Status Environment::setAll(const Environment& add_environment) {
// 1. Save old values
std::map <Key, Value> old_values = values;
// 2. Add values to be added
std::map <Key, Value> add_values = add_environment.values;
for(std::map<Key, Value>::const_iterator iterator = add_values.begin();
iterator != add_values.end(); iterator++) {
values[iterator->first] = iterator->second;
}
// 3. Validate only if our environment is already valid
if (valid) {
Status ret = validate();
if (!ret.isOK()) {
// 4. Revert to old values if this was invalid
values = old_values;
return ret;
}
}
return Status::OK();
}
/** Validate the Environment by iterating over all our constraints and calling them on our
* Environment
*/
Status Environment::validate() {
// 1. Iterate and check all KeyConstraints
typedef std::vector<boost::shared_ptr<KeyConstraint> >::iterator it_keyConstraint;
for(it_keyConstraint iterator = keyConstraints.begin();
iterator != keyConstraints.end(); iterator++) {
Status ret = (*(*iterator).get())(*this);
if (!ret.isOK()) {
return ret;
}
}
// 2. Iterate and check all Constraints
typedef std::vector<boost::shared_ptr<Constraint> >::iterator it_constraint;
for(it_constraint iterator = constraints.begin();
iterator != constraints.end(); iterator++) {
Status ret = (*(*iterator).get())(*this);
if (!ret.isOK()) {
return ret;
}
}
// 3. Our Environment is now valid. Record this and return success
valid = true;
return Status::OK();
}
/** Implementation of legacy interface to be consistent with
* boost::program_options::variables_map during the transition period
*
* boost::program_options::variables_map inherits the count function from std::map, which
* returns 1 if the value is set, and 0 if it is not set
*/
bool Environment::count(const Key& key) const {
Value value;
Status ret = get(key, &value);
if (ret.isOK()) {
return true;
}
else {
return false;
}
}
Value Environment::operator[](const Key& key) const {
Value value;
Status ret = get(key, &value);
return value;
}
/* Debugging */
void Environment::dump() {
std::map<Key, Value>::iterator iter;
for (iter = values.begin(); iter != values.end(); ++iter) {
std::cout << "Key: '"
<< iter->first
<< "', Value: '"
<< iter->second.toString()
<< "'" << std::endl;
}
}
} // namespace optionenvironment
} // namespace mongo
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