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      1 /*
      2  * Copyright (C) 2008, 2009 Apple Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  *
      8  * 1.  Redistributions of source code must retain the above copyright
      9  *     notice, this list of conditions and the following disclaimer.
     10  * 2.  Redistributions in binary form must reproduce the above copyright
     11  *     notice, this list of conditions and the following disclaimer in the
     12  *     documentation and/or other materials provided with the distribution.
     13  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
     14  *     its contributors may be used to endorse or promote products derived
     15  *     from this software without specific prior written permission.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
     18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     20  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #ifndef SourceProvider_h
     30 #define SourceProvider_h
     31 
     32 #include "SourceProviderCache.h"
     33 #include "UString.h"
     34 #include <wtf/PassOwnPtr.h>
     35 #include <wtf/RefCounted.h>
     36 #include <wtf/UnusedParam.h>
     37 #include <wtf/text/TextPosition.h>
     38 
     39 namespace JSC {
     40 
     41     class SourceProvider : public RefCounted<SourceProvider> {
     42     public:
     43         SourceProvider(const UString& url, SourceProviderCache* cache = 0)
     44             : m_url(url)
     45             , m_validated(false)
     46             , m_cache(cache ? cache : new SourceProviderCache)
     47             , m_cacheOwned(!cache)
     48         {
     49         }
     50         virtual ~SourceProvider()
     51         {
     52             if (m_cacheOwned)
     53                 delete m_cache;
     54         }
     55 
     56         virtual UString getRange(int start, int end) const = 0;
     57         virtual const UChar* data() const = 0;
     58         virtual int length() const = 0;
     59 
     60         const UString& url() { return m_url; }
     61         virtual TextPosition1 startPosition() const { return TextPosition1::minimumPosition(); }
     62         intptr_t asID() { return reinterpret_cast<intptr_t>(this); }
     63 
     64         bool isValid() const { return m_validated; }
     65         void setValid() { m_validated = true; }
     66 
     67         SourceProviderCache* cache() const { return m_cache; }
     68         void notifyCacheSizeChanged(int delta) { if (!m_cacheOwned) cacheSizeChanged(delta); }
     69 
     70     private:
     71         virtual void cacheSizeChanged(int delta) { UNUSED_PARAM(delta); }
     72 
     73         UString m_url;
     74         bool m_validated;
     75         SourceProviderCache* m_cache;
     76         bool m_cacheOwned;
     77     };
     78 
     79     class UStringSourceProvider : public SourceProvider {
     80     public:
     81         static PassRefPtr<UStringSourceProvider> create(const UString& source, const UString& url)
     82         {
     83             return adoptRef(new UStringSourceProvider(source, url));
     84         }
     85 
     86         UString getRange(int start, int end) const
     87         {
     88             return m_source.substringSharingImpl(start, end - start);
     89         }
     90         const UChar* data() const { return m_source.characters(); }
     91         int length() const { return m_source.length(); }
     92 
     93     private:
     94         UStringSourceProvider(const UString& source, const UString& url)
     95             : SourceProvider(url)
     96             , m_source(source)
     97         {
     98         }
     99 
    100         UString m_source;
    101     };
    102 
    103 } // namespace JSC
    104 
    105 #endif // SourceProvider_h
    106