/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsSMILValue.h"

#include "nsDebug.h"

#include <string.h>

//----------------------------------------------------------------------

// Public methods

nsSMILValue::nsSMILValue(const nsISMILType* aType)

  : mType(nsSMILNullType::Singleton())

{

  mU.mBool = false;

  if (!aType) {

    NS_ERROR("Trying to construct nsSMILValue with null mType pointer");

    return;

  }

  InitAndCheckPostcondition(aType);

}

nsSMILValue::nsSMILValue(const nsSMILValue& aVal)

  : mType(nsSMILNullType::Singleton())

{

  InitAndCheckPostcondition(aVal.mType);

  mType->Assign(*this, aVal);

}

const nsSMILValue&

nsSMILValue::operator=(const nsSMILValue& aVal)

{

  if (&aVal == this)

    return *this;

  if (mType != aVal.mType) {

    DestroyAndReinit(aVal.mType);

  }

  mType->Assign(*this, aVal);

  return *this;

}

// Move constructor / reassignment operator:

nsSMILValue::nsSMILValue(nsSMILValue&& aVal)

  : mU(aVal.mU), // Copying union is only OK because we clear aVal.mType below.

    mType(aVal.mType)

{

  // Leave aVal with a null type, so that it's safely destructible (and won't

  // mess with anything referenced by its union, which we've copied).

  aVal.mType = nsSMILNullType::Singleton();

}

nsSMILValue&

nsSMILValue::operator=(nsSMILValue&& aVal)

{

  if (!IsNull()) {

    // Clean up any data we're currently tracking.

    DestroyAndCheckPostcondition();

  }

  // Copy the union (which could include a pointer to external memory) & mType:

  mU = aVal.mU;

  mType = aVal.mType;

  // Leave aVal with a null type, so that it's safely destructible (and won't

  // mess with anything referenced by its union, which we've now copied).

  aVal.mType = nsSMILNullType::Singleton();

  return *this;

}

bool

nsSMILValue::operator==(const nsSMILValue& aVal) const

{

  if (&aVal == this)

    return true;

  return mType == aVal.mType && mType->IsEqual(*this, aVal);

}

nsresult

nsSMILValue::Add(const nsSMILValue& aValueToAdd, uint32_t aCount)

{

  if (aValueToAdd.mType != mType) {

    NS_ERROR("Trying to add incompatible types");

    return NS_ERROR_FAILURE;

  }

  return mType->Add(*this, aValueToAdd, aCount);

}

nsresult

nsSMILValue::SandwichAdd(const nsSMILValue& aValueToAdd)

{

  if (aValueToAdd.mType != mType) {

    NS_ERROR("Trying to add incompatible types");

    return NS_ERROR_FAILURE;

  }

  return mType->SandwichAdd(*this, aValueToAdd);

}

nsresult

nsSMILValue::ComputeDistance(const nsSMILValue& aTo, double& aDistance) const

{

  if (aTo.mType != mType) {

    NS_ERROR("Trying to calculate distance between incompatible types");

    return NS_ERROR_FAILURE;

  }

  return mType->ComputeDistance(*this, aTo, aDistance);

}

nsresult

nsSMILValue::Interpolate(const nsSMILValue& aEndVal,

                         double aUnitDistance,

                         nsSMILValue& aResult) const

{

  if (aEndVal.mType != mType) {

    NS_ERROR("Trying to interpolate between incompatible types");

    return NS_ERROR_FAILURE;

  }

  if (aResult.mType != mType) {

    // Outparam has wrong type

    aResult.DestroyAndReinit(mType);

  }

  return mType->Interpolate(*this, aEndVal, aUnitDistance, aResult);

}

//----------------------------------------------------------------------

// Helper methods

// Wrappers for nsISMILType::Init & ::Destroy that verify their postconditions

void

nsSMILValue::InitAndCheckPostcondition(const nsISMILType* aNewType)

{

  aNewType->Init(*this);

  MOZ_ASSERT(mType == aNewType,

             "Post-condition of Init failed. nsSMILValue is invalid");

}

void

nsSMILValue::DestroyAndCheckPostcondition()

{

  mType->Destroy(*this);

  MOZ_ASSERT(IsNull(),

             "Post-condition of Destroy failed. "

             "nsSMILValue not null after destroying");

}

void

nsSMILValue::DestroyAndReinit(const nsISMILType* aNewType)

{

  DestroyAndCheckPostcondition();

  InitAndCheckPostcondition(aNewType);

}