Page Speed Optimization Libraries  1.4.26.1
net/instaweb/rewriter/public/css_resource_slot.h
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00001 /*
00002  * Copyright 2011 Google Inc.
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *      http:///www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 
00022 
00023 #ifndef NET_INSTAWEB_REWRITER_PUBLIC_CSS_RESOURCE_SLOT_H_
00024 #define NET_INSTAWEB_REWRITER_PUBLIC_CSS_RESOURCE_SLOT_H_
00025 
00026 #include <cstddef>
00027 #include <set>
00028 
00029 #include "net/instaweb/rewriter/public/resource.h"
00030 #include "net/instaweb/rewriter/public/resource_slot.h"
00031 #include "net/instaweb/util/public/basictypes.h"
00032 #include "net/instaweb/util/public/scoped_ptr.h"
00033 #include "net/instaweb/util/public/string.h"
00034 #include "net/instaweb/util/public/string_util.h"
00035 
00036 namespace Css { class Values; }
00037 
00038 namespace net_instaweb {
00039 
00040 class GoogleUrl;
00041 
00043 class CssResourceSlot : public ResourceSlot {
00044  public:
00045   virtual void Render();
00046   virtual void Finished();
00047   virtual GoogleString LocationString();
00048 
00049   Css::Values* values() const { return values_; }
00050   size_t value_index() const { return value_index_; }
00051 
00053   void EnableTrim(const GoogleUrl& base_url);
00054 
00055   virtual void DirectSetUrl(const StringPiece& url);
00056   virtual bool CanDirectSetUrl() { return true; }
00057 
00058  protected:
00059   CssResourceSlot(const ResourcePtr& resource, Css::Values* values,
00060                   size_t value_index)
00061       : ResourceSlot(resource),
00062         values_(values),
00063         value_index_(value_index) {
00064   }
00065 
00066   REFCOUNT_FRIEND_DECLARATION(CssResourceSlot);
00067   virtual ~CssResourceSlot();
00068 
00069  private:
00070   friend class CssResourceSlotFactory;
00071 
00072   Css::Values* values_;
00073   size_t value_index_;
00074   scoped_ptr<GoogleUrl> trim_base_; 
00075 
00076   DISALLOW_COPY_AND_ASSIGN(CssResourceSlot);
00077 };
00078 
00079 typedef RefCountedPtr<CssResourceSlot> CssResourceSlotPtr;
00080 
00083 class CssResourceSlotFactory {
00084  public:
00085   CssResourceSlotFactory() {}
00086   ~CssResourceSlotFactory();
00087 
00090   CssResourceSlotPtr GetSlot(const ResourcePtr& resource,
00091                              Css::Values* values, size_t value_index);
00092   CssResourceSlotPtr UniquifySlot(CssResourceSlotPtr slot);
00093 
00094  private:
00095   class SlotComparator {
00096    public:
00097     bool operator()(const CssResourceSlotPtr& p,
00098                     const CssResourceSlotPtr& q) const;
00099   };
00100   typedef std::set<CssResourceSlotPtr, SlotComparator> SlotSet;
00101 
00102   SlotSet slots_;
00103   DISALLOW_COPY_AND_ASSIGN(CssResourceSlotFactory);
00104 };
00105 
00106 }  
00107 
00108 #endif  ///< NET_INSTAWEB_REWRITER_PUBLIC_CSS_RESOURCE_SLOT_H_
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