text: // Copyright 2010-2018, Google Inc.
  // All rights reserved.
  //
  // Redistribution and use in source and binary forms, with or without
  // modification, are permitted provided that the following conditions are
  // met:
  //
  //     * Redistributions of source code must retain the above copyright
  // notice, this list of conditions and the following disclaimer.
  //     * Redistributions in binary form must reproduce the above
  // copyright notice, this list of conditions and the following disclaimer
  // in the documentation and/or other materials provided with the
  // distribution.
  //     * Neither the name of Google Inc. nor the names of its
  // contributors may be used to endorse or promote products derived from
  // this software without specific prior written permission.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  #include "win32/tip/tip_enum_display_attributes.h"
  
  #include "win32/tip/tip_display_attributes.h"
  
  namespace mozc {
  namespace win32 {
  namespace tsf {
  
  TipEnumDisplayAttributes::TipEnumDisplayAttributes()
      : index_(0) {
  }
  
  TipEnumDisplayAttributes::~TipEnumDisplayAttributes() {
  }
  
  // Implements the IUnknown::QueryInterface() function.
  HRESULT STDMETHODCALLTYPE TipEnumDisplayAttributes::QueryInterface(
      REFIID interface_id, void **object) {
    if (*object == nullptr) {
      return E_INVALIDARG;
    }
  
    // Find a matching interface from the ones implemented by this object.
    if (::IsEqualIID(interface_id, IID_IUnknown)) {
      *object = static_cast<IUnknown *>(this);
      AddRef();
      return S_OK;
    } else if (::IsEqualIID(interface_id, IID_IEnumTfDisplayAttributeInfo)) {
      *object = static_cast<IEnumTfDisplayAttributeInfo *>(this);
      AddRef();
      return S_OK;
    }
  
    *object = nullptr;
    return E_NOINTERFACE;
  }
  
  // Implements the IUnknown::AddRef() function.
  ULONG STDMETHODCALLTYPE TipEnumDisplayAttributes::AddRef() {
    return ref_count_.AddRefImpl();
  }
  
  // Implements the IUnknown::Release() function.
  ULONG STDMETHODCALLTYPE TipEnumDisplayAttributes::Release() {
    const ULONG count = ref_count_.ReleaseImpl();
    if (count == 0) {
      delete this;
    }
    return count;
  }
  
  // Implements the IEnumTfDisplayAttributeInfo::Clone() function.
  HRESULT STDMETHODCALLTYPE TipEnumDisplayAttributes::Clone(
      IEnumTfDisplayAttributeInfo **enum_attributes) {
    // Check the output argument and return if it is invalid.
    if (enum_attributes == nullptr) {
      return E_INVALIDARG;
    }
  
    // Create a new ImeEnumDisplayAttributeInfo object.
    TipEnumDisplayAttributes *clone = new TipEnumDisplayAttributes;
  
    // Copy the state of the source object (except its reference count).
    clone->index_ = index_;
    *enum_attributes = clone;
    (*enum_attributes)->AddRef();
    return S_OK;
  }
  
  // Implements the IEnumTfDisplayAttributeInfo::Next() function.
  // This function copies the |count| items from the current position into
  // the |attribute_array|.
  HRESULT STDMETHODCALLTYPE TipEnumDisplayAttributes::Next(
      ULONG count,
      ITfDisplayAttributeInfo **attribute_array,
      ULONG *fetched) {
    ULONG items = 0;
    for (; items < count; ++items) {
      ITfDisplayAttributeInfo *attribute = nullptr;
      if (index_ == 0) {
        attribute = new TipDisplayAttributeInput();
      } else if (index_ == 1) {
        attribute = new TipDisplayAttributeConverted();
      } else {
        break;
      }
      attribute_array[items] = attribute;
      attribute->AddRef();
      ++index_;
    }
  
    if (fetched) {
      *fetched = items;
    }
  
    return (items == count) ? S_OK : S_FALSE;
  }
  
  // Implements the IEnumTfDisplayAttributeInfo::Reset() function.
  // This function resets the iterator of this enumeration list.
  HRESULT STDMETHODCALLTYPE TipEnumDisplayAttributes::Reset() {
    index_ = 0;
    return S_OK;
  }
  
  // Implements the IEnumTfDisplayAttributeInfo::Skip() function.
  // This function skips |count| items in this enumeration list.
  HRESULT STDMETHODCALLTYPE TipEnumDisplayAttributes::Skip(ULONG count) {
    // There is only a single item to enum
    // so just skip it and avoid any overflow errors
    if (count > 0 && index_ == 0) {
      ++index_;
    }
    return S_OK;
  }
  
  }  // namespace tsf
  }  // namespace win32
  }  // namespace mozc
  