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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
/**
* \class document::CollectionFieldValue
* \ingroup fieldvalue
*
* \brief A field value containing a collection of other equally typed values.
*
* This class is the superclass of array and weighted set field values. It
* contains some common functionality.
*/
#pragma once
#include "fieldvalue.h"
#include <vespa/document/datatype/collectiondatatype.h>
namespace document {
class CollectionFieldValue : public FieldValue {
protected:
const DataType *_type;
// As overloading doesn't work with polymorphy, have protected functions
// doing the functionality, such that we can make utility functions here
virtual bool addValue(const FieldValue&) = 0;
virtual bool containsValue(const FieldValue&) const = 0;
virtual bool removeValue(const FieldValue&) = 0;
void verifyType(const CollectionFieldValue& other) const;
public:
CollectionFieldValue(Type type, const DataType &dataType)
: FieldValue(type),
_type(&dataType)
{}
CollectionFieldValue(const CollectionFieldValue& other);
CollectionFieldValue& operator=(const CollectionFieldValue& other) {
verifyType(other);
return *this;
}
const DataType *getDataType() const override { return _type; }
FieldValue::UP createNested() const {
return getNestedType().createFieldValue();
}
const DataType &getNestedType() const {
return static_cast<const CollectionDataType&>(*_type).getNestedType();
}
/**
* @return True if element was added. False if element was overwritten.
* @throws InvalidDataTypeException If fieldvalue of wrong type is attempted
* added.
*/
bool add(const FieldValue& val) { return addValue(val); }
bool contains(const FieldValue& val) const { return containsValue(val); }
/** @return True if element was found and removed. False if not found. */
bool remove(const FieldValue& val) { return removeValue(val); }
virtual bool isEmpty() const = 0;
virtual size_t size() const = 0;
virtual void clear() = 0;
};
}
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