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fbb68dbcd0
In essence, namespace behaviors acted as hooks for update operations on namespaces. Two behaviors were implemented: - `NamespaceBehavior`: allows the update operation unless it acts on a value that itself was explicitly marked as constant. - `ConstNamespaceBehavior`: initially allows insert operations but marks the individual values as const. Additionally provides a `Freeze()` member function. After this was called, updates are rejected unless a special `overrideFrozen` flag is set explicitly. This marvel of object-oriented programming can be replaced with a simple bool. This commit basically replaces `Namespace::m_Behavior` with `Namespace::m_ConstValues` and inlines the behavior functions where they were called. While doing so, the code was slightly simplified by assuming that `m_ConstValues` is true if `m_Frozen` is true. This is similar to what the API allowed in the old code as you could only freeze a `ConstNamespaceBehavior`. However, this PR moves the `Freeze()` member function and the related `m_Freeze` member variable to the `Namespace` class. So now the API allows any namespace to be frozen. The new code also makes sense with the previously mentioned simplification: a `Namespace` with `m_ConstValues = false` can be modified without restrictions until `Freeze()` is called. When this is done, it becomes read-only. The changes outside of `namespace.*` just adapt the code to the slightly changed API.
97 lines
2.6 KiB
C++
97 lines
2.6 KiB
C++
/* Icinga 2 | (c) 2012 Icinga GmbH | GPLv2+ */
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#ifndef NAMESPACE_H
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#define NAMESPACE_H
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#include "base/i2-base.hpp"
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#include "base/object.hpp"
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#include "base/shared-object.hpp"
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#include "base/value.hpp"
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#include "base/debuginfo.hpp"
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#include <map>
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#include <vector>
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#include <memory>
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namespace icinga
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{
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struct NamespaceValue : public SharedObject
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{
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DECLARE_PTR_TYPEDEFS(NamespaceValue);
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virtual Value Get(const DebugInfo& debugInfo = DebugInfo()) const = 0;
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virtual void Set(const Value& value, bool overrideFrozen, const DebugInfo& debugInfo = DebugInfo()) = 0;
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};
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struct EmbeddedNamespaceValue : public NamespaceValue
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{
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EmbeddedNamespaceValue(const Value& value);
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Value Get(const DebugInfo& debugInfo) const override;
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void Set(const Value& value, bool overrideFrozen, const DebugInfo& debugInfo) override;
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private:
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Value m_Value;
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};
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struct ConstEmbeddedNamespaceValue : public EmbeddedNamespaceValue
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{
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using EmbeddedNamespaceValue::EmbeddedNamespaceValue;
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void Set(const Value& value, bool overrideFrozen, const DebugInfo& debugInfo) override;
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};
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/**
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* A namespace.
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*
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* @ingroup base
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*/
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class Namespace final : public Object
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{
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public:
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DECLARE_OBJECT(Namespace);
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typedef std::map<String, NamespaceValue::Ptr>::iterator Iterator;
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typedef std::map<String, NamespaceValue::Ptr>::value_type Pair;
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explicit Namespace(bool constValues = false);
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Value Get(const String& field) const;
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bool Get(const String& field, Value *value) const;
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void Set(const String& field, const Value& value, bool overrideFrozen = false);
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bool Contains(const String& field) const;
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void Remove(const String& field, bool overrideFrozen = false);
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void Freeze();
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NamespaceValue::Ptr GetAttribute(const String& field) const;
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void SetAttribute(const String& field, const NamespaceValue::Ptr& nsVal);
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void RemoveAttribute(const String& field);
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Iterator Begin();
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Iterator End();
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size_t GetLength() const;
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Value GetFieldByName(const String& field, bool sandboxed, const DebugInfo& debugInfo) const override;
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void SetFieldByName(const String& field, const Value& value, bool overrideFrozen, const DebugInfo& debugInfo) override;
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bool HasOwnField(const String& field) const override;
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bool GetOwnField(const String& field, Value *result) const override;
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static Object::Ptr GetPrototype();
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private:
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std::map<String, NamespaceValue::Ptr> m_Data;
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bool m_ConstValues;
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bool m_Frozen;
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};
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Namespace::Iterator begin(const Namespace::Ptr& x);
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Namespace::Iterator end(const Namespace::Ptr& x);
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}
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extern template class std::map<icinga::String, std::shared_ptr<icinga::NamespaceValue> >;
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#endif /* NAMESPACE_H */
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