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// Copyright 2015 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef COBALT_CSSOM_SCOPED_LIST_VALUE_H_
#define COBALT_CSSOM_SCOPED_LIST_VALUE_H_
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/memory/scoped_vector.h"
#include "cobalt/cssom/property_value.h"
namespace cobalt {
namespace cssom {
// This class can be used to represent a CSS property value that is a list of
// heap-allocated polymorphic objects. If the list elements do not need to
// be allocated on the heap, then it may be more efficient to use ListValue
// instead. All elements must derive from base::PolymorphicEquatable so that
// they can be tested for equality by value.
template <typename T>
class ScopedListValue : public PropertyValue {
public:
typedef ScopedVector<T> Builder;
explicit ScopedListValue(Builder value) : value_(value.Pass()) {
DCHECK(!value_.empty());
}
const T& get_item_modulo_size(int index) const {
return *value_[index % value_.size()];
}
const Builder& value() const { return value_; }
bool operator==(const ScopedListValue<T>& other) const {
if (value_.size() != other.value_.size()) return false;
typename Builder::const_iterator iter_a = value_.begin();
typename Builder::const_iterator iter_b = other.value_.begin();
for (; iter_a != value_.end(); ++iter_a, ++iter_b) {
if (!(*iter_a)->Equals(**iter_b)) {
return false;
}
}
return true;
}
protected:
~ScopedListValue() OVERRIDE {}
const Builder value_;
private:
DISALLOW_COPY_AND_ASSIGN(ScopedListValue<T>);
};
} // namespace cssom
} // namespace cobalt
#endif // COBALT_CSSOM_SCOPED_LIST_VALUE_H_