MultiContainer.h

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// Copyright Onix Solutions Limited [OnixS]. All rights reserved.
//
// This software owned by Onix Solutions Limited [OnixS] and is
// protected by copyright law and international copyright treaties.
//
// Access to and use of the software is governed by the terms of the applicable
// OnixS Software Services Agreement (the Agreement) and Customer end user license
// agreements granting a non-assignable, non-transferable and non-exclusive license
// to use the software for it's own data processing purposes under the terms defined
// in the Agreement.
//
// Except as otherwise granted within the terms of the Agreement, copying or
// reproduction of any part of this source code or associated reference material
// to any other location for further reproduction or redistribution, and any
// amendments to this copyright notice, are expressly prohibited.
//
// Any reproduction or redistribution for sale or hiring of the Software not in
// accordance with the terms of the Agreement is a violation of copyright law.
//
 
#pragma once
 
#include <cassert>
 
#include <vector>
#include <algorithm>
 
#include <OnixS/CME/MDH/String.h>
#include <OnixS/CME/MDH/FIX/Tag.h>
 
ONIXS_CMEMDHFIX_NAMESPACE_BEGIN

class ONIXS_CMEMDH_LTWT TagValue
{
    Tag tag_;
    StrRef value_;
 
public:
    typedef StrRef Value;

    TagValue()
        : tag_(0)
        , value_()
    {
    }

    TagValue(Tag tag, const Value& value)
        : tag_(tag)
        , value_(value)
    {
    }

    Tag tag() const
    {
        return tag_;
    }

    void tag(Tag tag)
    {
        tag_ = tag;
    }

    const Value& value() const
    {
        return value_;
    }

    void value(const Value& value)
    {
        value_ = value;
    }

    void value(const Char* data, size_t size)
    {
        value_.reset(data, size);
    }
};

ONIXS_CMEMDH_EXPORTED
void toStr(std::string&, const TagValue&);

inline std::string toStr(const TagValue& tagValue)
{
    std::string str;
 
    toStr(str, tagValue);
 
    return str;
}

typedef std::vector<TagValue> TagValues;

typedef TagValues::iterator TagValueIterator;

typedef TagValues::const_iterator TagValueConstIterator;

class ONIXS_CMEMDH_LTWT TagValueSelector
{
    Tag tag_;
 
public:
    explicit TagValueSelector(Tag tag)
        : tag_(tag)
    {
    }

    bool operator()(const TagValue& tagValue) const
    {
        return (tagValue.tag() == tag_);
    }
};

class ONIXS_CMEMDH_LTWT TagValueSelectionIterator
{
    const TagValues* container_;
    TagValueConstIterator ref_;
 
public:
    TagValueSelectionIterator()
        : container_(ONIXS_CMEMDH_NULLPTR)
        , ref_()
    {
    }

    TagValueSelectionIterator(const TagValues& container, Tag selection)
        : container_(&container)
        , ref_(std::find_if(container.begin(), container.end(), TagValueSelector(selection)))
    {
    }

    operator bool() const
    {
        return (container_ && ref_ != container_->end());
    }

    const TagValue& operator*() const
    {
        assert(static_cast<bool>(*this));
 
        return *ref_;
    }

    TagValueSelectionIterator& operator++()
    {
        assert(static_cast<bool>(*this));
 
        const Tag selection = ref_->tag();
 
        ref_ = std::find_if(++ref_, container_->end(), TagValueSelector(selection));
 
        return *this;
    }
};

class ONIXS_CMEMDH_LTWT MultiContainer
{
    TagValues tagValues_;
 
    // Builds sequence of tag-value pairs
    // from the given FIX (tag=value) string.
    ONIXS_CMEMDH_LTWT_EXPORTED
    static void deserialize(TagValues&, const Char*, size_t);
 
public:
    typedef Tag Key;

    typedef TagValue::Value Value;

    typedef TagValues::const_iterator Iterator;

    typedef TagValueSelectionIterator SelectionIterator;

    MultiContainer() {}

    ~MultiContainer() {}

    Iterator begin() const
    {
        return tagValues_.begin();
    }

    Iterator end() const
    {
        return tagValues_.end();
    }

    Iterator first(Key tag) const
    {
        return std::find_if(tagValues_.begin(), tagValues_.end(), TagValueSelector(tag));
    }

    SelectionIterator all(Key tag) const
    {
        return SelectionIterator(tagValues_, tag);
    }

    void deserialize(const Char* fixStr, size_t fixSize)
    {
        tagValues_.clear();
 
        deserialize(tagValues_, fixStr, fixSize);
    }
};

inline MultiContainer::Value valueOrDefault(
    const MultiContainer& container,
    Tag tag,
    const MultiContainer::Value& defaultValue = MultiContainer::Value()
)
{
    const MultiContainer::Iterator result = container.first(tag);
 
    if (result != container.end())
    {
        return result->value();
    }
 
    return defaultValue;
}

template <class Number>
bool value(Number& number, const MultiContainer& container, Tag tag)
{
    const MultiContainer::Value strValue = valueOrDefault(container, tag);
 
    return fromStr(number, strValue.items(), strValue.size());
}

template <class Number>
bool valueOrDefault(Number& number, const MultiContainer& container, Tag tag, Number defaultValue = Number())
{
    const MultiContainer::Value strValue = valueOrDefault(container, tag);
 
    if (strValue.empty())
    {
        number = defaultValue;
 
        return true;
    }
 
    return fromStr(number, strValue.items(), strValue.size());
}

ONIXS_CMEMDH_EXPORTED
void toStr(std::string&, const MultiContainer&);

inline std::string toStr(const MultiContainer& container)
{
    std::string str;
 
    toStr(str, container);
 
    return str;
}
 
ONIXS_CMEMDHFIX_NAMESPACE_END