JUCE/modules/juce_core/containers/juce_NamedValueSet.cpp

/*
  ==============================================================================

   This file is part of the JUCE library.
   Copyright (c) 2017 - ROLI Ltd.

   JUCE is an open source library subject to commercial or open-source
   licensing.

   The code included in this file is provided under the terms of the ISC license
   http://www.isc.org/downloads/software-support-policy/isc-license. Permission
   To use, copy, modify, and/or distribute this software for any purpose with or
   without fee is hereby granted provided that the above copyright notice and
   this permission notice appear in all copies.

   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.

  ==============================================================================
*/

namespace juce
{

NamedValueSet::NamedValue::NamedValue() noexcept {}
NamedValueSet::NamedValue::~NamedValue() noexcept {}

NamedValueSet::NamedValue::NamedValue (const Identifier& n, const var& v)  : name (n), value (v) {}
NamedValueSet::NamedValue::NamedValue (const NamedValue& other) : NamedValue (other.name, other.value) {}

NamedValueSet::NamedValue::NamedValue (NamedValue&& other) noexcept
   : NamedValue (static_cast<Identifier&&> (other.name),
                 static_cast<var&&> (other.value))
{}

NamedValueSet::NamedValue::NamedValue (const Identifier& n, var&& v) noexcept
   : name (n), value (static_cast<var&&> (v))
{
}

NamedValueSet::NamedValue::NamedValue (Identifier&& n, var&& v) noexcept
   : name (static_cast<Identifier&&> (n)),
     value (static_cast<var&&> (v))
{}

NamedValueSet::NamedValue& NamedValueSet::NamedValue::operator= (NamedValue&& other) noexcept
{
    name = static_cast<Identifier&&> (other.name);
    value = static_cast<var&&> (other.value);
    return *this;
}

bool NamedValueSet::NamedValue::operator== (const NamedValue& other) const noexcept   { return name == other.name && value == other.value; }
bool NamedValueSet::NamedValue::operator!= (const NamedValue& other) const noexcept   { return ! operator== (other); }

//==============================================================================
NamedValueSet::NamedValueSet() noexcept {}
NamedValueSet::~NamedValueSet() noexcept {}

NamedValueSet::NamedValueSet (const NamedValueSet& other)  : values (other.values) {}
NamedValueSet::NamedValueSet (NamedValueSet&& other) noexcept  : values (static_cast<Array<NamedValue>&&> (other.values)) {}

NamedValueSet& NamedValueSet::operator= (const NamedValueSet& other)
{
    clear();
    values = other.values;
    return *this;
}

NamedValueSet& NamedValueSet::operator= (NamedValueSet&& other) noexcept
{
    other.values.swapWith (values);
    return *this;
}

void NamedValueSet::clear()
{
    values.clear();
}

bool NamedValueSet::operator== (const NamedValueSet& other) const noexcept
{
    auto num = values.size();

    if (num != other.values.size())
        return false;

    for (int i = 0; i < num; ++i)
    {
        // optimise for the case where the keys are in the same order
        if (values.getReference(i).name == other.values.getReference(i).name)
        {
            if (values.getReference(i).value != other.values.getReference(i).value)
                return false;
        }
        else
        {
            // if we encounter keys that are in a different order, search remaining items by brute force..
            for (int j = i; j < num; ++j)
            {
                if (auto* otherVal = other.getVarPointer (values.getReference(j).name))
                    if (values.getReference(j).value == *otherVal)
                        continue;

                return false;
            }

            return true;
        }
    }

    return true;
}

bool NamedValueSet::operator!= (const NamedValueSet& other) const noexcept   { return ! operator== (other); }

int NamedValueSet::size() const noexcept        { return values.size(); }
bool NamedValueSet::isEmpty() const noexcept    { return values.isEmpty(); }

static const var& getNullVarRef() noexcept
{
    static var nullVar;
    return nullVar;
}

const var& NamedValueSet::operator[] (const Identifier& name) const noexcept
{
    if (auto* v = getVarPointer (name))
        return *v;

    return getNullVarRef();
}

var NamedValueSet::getWithDefault (const Identifier& name, const var& defaultReturnValue) const
{
    if (auto* v = getVarPointer (name))
        return *v;

    return defaultReturnValue;
}

var* NamedValueSet::getVarPointer (const Identifier& name) const noexcept
{
    for (auto& i : values)
        if (i.name == name)
            return &(i.value);

    return {};
}

bool NamedValueSet::set (const Identifier& name, var&& newValue)
{
    if (auto* v = getVarPointer (name))
    {
        if (v->equalsWithSameType (newValue))
            return false;

        *v = static_cast<var&&> (newValue);
        return true;
    }

    values.add ({ name, static_cast<var&&> (newValue) });
    return true;
}

bool NamedValueSet::set (const Identifier& name, const var& newValue)
{
    if (auto* v = getVarPointer (name))
    {
        if (v->equalsWithSameType (newValue))
            return false;

        *v = newValue;
        return true;
    }

    values.add ({ name, newValue });
    return true;
}

bool NamedValueSet::contains (const Identifier& name) const noexcept
{
    return getVarPointer (name) != nullptr;
}

int NamedValueSet::indexOf (const Identifier& name) const noexcept
{
    auto numValues = values.size();

    for (int i = 0; i < numValues; ++i)
        if (values.getReference(i).name == name)
            return i;

    return -1;
}

bool NamedValueSet::remove (const Identifier& name)
{
    auto numValues = values.size();

    for (int i = 0; i < numValues; ++i)
    {
        if (values.getReference(i).name == name)
        {
            values.remove (i);
            return true;
        }
    }

    return false;
}

Identifier NamedValueSet::getName (const int index) const noexcept
{
    if (isPositiveAndBelow (index, values.size()))
        return values.getReference (index).name;

    jassertfalse;
    return {};
}

const var& NamedValueSet::getValueAt (const int index) const noexcept
{
    if (isPositiveAndBelow (index, values.size()))
        return values.getReference (index).value;

    jassertfalse;
    return getNullVarRef();
}

var* NamedValueSet::getVarPointerAt (int index) const noexcept
{
    if (isPositiveAndBelow (index, values.size()))
        return &(values.getReference (index).value);

    return {};
}

void NamedValueSet::setFromXmlAttributes (const XmlElement& xml)
{
    values.clearQuick();

    for (auto* att = xml.attributes.get(); att != nullptr; att = att->nextListItem)
    {
        if (att->name.toString().startsWith ("base64:"))
        {
            MemoryBlock mb;

            if (mb.fromBase64Encoding (att->value))
            {
                values.add ({ att->name.toString().substring (7), var (mb) });
                continue;
            }
        }

        values.add ({ att->name, var (att->value) });
    }
}

void NamedValueSet::copyToXmlAttributes (XmlElement& xml) const
{
    for (auto& i : values)
    {
        if (auto* mb = i.value.getBinaryData())
        {
            xml.setAttribute ("base64:" + i.name.toString(), mb->toBase64Encoding());
        }
        else
        {
            // These types can't be stored as XML!
            jassert (! i.value.isObject());
            jassert (! i.value.isMethod());
            jassert (! i.value.isArray());

            xml.setAttribute (i.name.toString(),
                              i.value.toString());
        }
    }
}

} // namespace juce