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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/document/fieldvalue/fieldvalue.h>
#include <vespa/vsm/common/document.h>
namespace vsm {
/**
* Interface for classes that want to modify a field value.
**/
class FieldModifier
{
public:
using UP = std::unique_ptr<FieldModifier>;
/**
* Modifies the given field value and returns a new one.
**/
virtual document::FieldValue::UP modify(const document::FieldValue & fv) = 0;
/**
* Modifies the given field value and returns a new one.
* Use the given field path to iterate the field value.
**/
virtual document::FieldValue::UP modify(const document::FieldValue & fv,
const document::FieldPath & path) = 0;
virtual ~FieldModifier() { }
};
using FieldModifierMapT = vespalib::hash_map<FieldIdT, FieldModifier::UP>;
/**
* This class wraps a map from field id to field modifier.
**/
class FieldModifierMap
{
private:
FieldModifierMapT _map;
public:
FieldModifierMap();
~FieldModifierMap();
FieldModifierMapT & map() { return _map; }
const FieldModifierMapT & map() const { return _map; }
/**
* Returns the modifier associated with the given field id or NULL if not found.
*
* @param fId the field id to look up.
* @return the field modifier or NULL if not found.
**/
FieldModifier * getModifier(FieldIdT fId) const;
};
}
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