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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.
*/
#pragma once
#include "mongo/base/status.h"
#include "mongo/bson/util/builder.h"
#include "mongo/util/options_parser/environment.h"
namespace mongo {
namespace optionenvironment {
/** A Constraint validates an Environment. It has one function, which takes an Environment as
* an argument and returns either a success or failure Status depending on whether the
* Environment was valid according to this constraint
*
* These are meant to be registered with an Environment to define what it means for that
* Environment to be "valid" and run as part of its validation process
*/
class Constraint {
public:
// Interface
Status operator()(const Environment& env) { return check(env); }
virtual ~Constraint() {}
private:
// Implementation
virtual Status check(const Environment&) = 0;
};
/** A KeyConstraint is a Constraint on a specific Key. Currently this is not handled any
* differently than a Constraint, and is only here as a way to help document whether a
* Constraint applies to a single Key or an Environment as a whole
*/
class KeyConstraint : public Constraint {
public:
KeyConstraint(const Key& key) :
_key(key)
{ }
virtual ~KeyConstraint() {}
protected:
Key _key;
};
/** Implementation of a Constraint on the range of a numeric Value. Fails if the Value is not a
* number, or if it is a number but outside the given range
*/
class NumericKeyConstraint : public KeyConstraint {
public:
NumericKeyConstraint(const Key& k, long min, long max) :
KeyConstraint(k),
_min(min),
_max(max)
{ }
virtual ~NumericKeyConstraint() {}
private:
virtual Status check(const Environment& env);
long _min;
long _max;
};
/** Implementation of a Constraint that makes a Value immutable. Fails if the Value has already
* been set and we are attempting to set it to a different Value. Note that setting it to the
* same value is allowed in this implementation
*/
class ImmutableKeyConstraint : public KeyConstraint {
public:
ImmutableKeyConstraint(const Key& k) : KeyConstraint(k)
{ }
virtual ~ImmutableKeyConstraint() {}
private:
virtual Status check(const Environment& env);
Value _value;
};
/** Implementation of a Constraint that makes two keys mutually exclusive. Fails if both keys
* are set.
*/
class MutuallyExclusiveKeyConstraint : public KeyConstraint {
public:
MutuallyExclusiveKeyConstraint(const Key& key, const Key& otherKey) : KeyConstraint(key),
_otherKey(otherKey)
{ }
virtual ~MutuallyExclusiveKeyConstraint() {}
private:
virtual Status check(const Environment& env);
Key _otherKey;
};
/** Implementation of a Constraint that makes one key require another. Fails if the first key
* is set but the other is not.
*/
class RequiresOtherKeyConstraint : public KeyConstraint {
public:
RequiresOtherKeyConstraint(const Key& key, const Key& otherKey) : KeyConstraint(key),
_otherKey(otherKey)
{ }
virtual ~RequiresOtherKeyConstraint() {}
private:
virtual Status check(const Environment& env);
Key _otherKey;
};
/** Implementation of a Constraint that enforces a specific format on a string value. Fails if
* the value of the key is not a string or does not match the given regex.
*/
class StringFormatKeyConstraint : public KeyConstraint {
public:
StringFormatKeyConstraint(const Key& key,
const std::string& regexFormat,
const std::string& displayFormat) : KeyConstraint(key),
_regexFormat(regexFormat),
_displayFormat(displayFormat)
{ }
virtual ~StringFormatKeyConstraint() {}
private:
virtual Status check(const Environment& env);
std::string _regexFormat;
std::string _displayFormat;
};
/** Implementation of a Constraint on the type of a Value. Fails if we cannot extract the given
* type from our Value, which means the implementation of the access functions of Value
* controls which types are "compatible"
*/
template <typename T>
class TypeKeyConstraint : public KeyConstraint {
public:
TypeKeyConstraint(const Key& k) :
KeyConstraint(k)
{ }
virtual ~TypeKeyConstraint() {}
private:
virtual Status check(const Environment& env) {
Value val;
Status s = env.get(_key, &val);
if (!s.isOK()) {
// Key not set, skipping type constraint check
return Status::OK();
}
// The code that controls whether a type is "compatible" is contained in the Value
// class, so if that handles compatibility between numeric types then this will too.
T typedVal;
if (!val.get(&typedVal).isOK()) {
StringBuilder sb;
sb << "Error: value for key: " << _key << " was found as type: "
<< val.typeToString() << " but is required to be type: " << typeid(typedVal).name();
return Status(ErrorCodes::InternalError, sb.str());
}
return Status::OK();
}
};
} // namespace optionenvironment
} // namespace mongo
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