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      1 /*
      2  * Copyright (C) 2010 Google 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 are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef FileWriter_h
     32 #define FileWriter_h
     33 
     34 #if ENABLE(FILE_SYSTEM)
     35 
     36 #include "ActiveDOMObject.h"
     37 #include "EventTarget.h"
     38 #include "FileWriterBase.h"
     39 #include <wtf/PassRefPtr.h>
     40 #include <wtf/RefPtr.h>
     41 
     42 namespace WebCore {
     43 
     44 class ScriptExecutionContext;
     45 
     46 class FileWriter : public FileWriterBase, public ActiveDOMObject, public EventTarget, public AsyncFileWriterClient {
     47 public:
     48     static PassRefPtr<FileWriter> create(ScriptExecutionContext* context)
     49     {
     50         return adoptRef(new FileWriter(context));
     51     }
     52 
     53     enum ReadyState {
     54         INIT = 0,
     55         WRITING = 1,
     56         DONE = 2
     57     };
     58 
     59     void write(Blob*, ExceptionCode&);
     60     void seek(long long position, ExceptionCode&);
     61     void truncate(long long length, ExceptionCode&);
     62     void abort(ExceptionCode&);
     63     ReadyState readyState() const { return m_readyState; }
     64     FileError* error() const { return m_error.get(); }
     65 
     66     // AsyncFileWriterClient
     67     void didWrite(long long bytes, bool complete);
     68     void didTruncate();
     69     void didFail(FileError::ErrorCode);
     70 
     71     // ActiveDOMObject
     72     virtual bool canSuspend() const;
     73     virtual bool hasPendingActivity() const;
     74     virtual void stop();
     75 
     76     // EventTarget
     77     virtual FileWriter* toFileWriter() { return this; }
     78     virtual ScriptExecutionContext* scriptExecutionContext() const { return ActiveDOMObject::scriptExecutionContext(); }
     79 
     80     using RefCounted<FileWriterBase>::ref;
     81     using RefCounted<FileWriterBase>::deref;
     82 
     83     DEFINE_ATTRIBUTE_EVENT_LISTENER(writestart);
     84     DEFINE_ATTRIBUTE_EVENT_LISTENER(progress);
     85     DEFINE_ATTRIBUTE_EVENT_LISTENER(write);
     86     DEFINE_ATTRIBUTE_EVENT_LISTENER(abort);
     87     DEFINE_ATTRIBUTE_EVENT_LISTENER(error);
     88     DEFINE_ATTRIBUTE_EVENT_LISTENER(writeend);
     89 
     90 private:
     91     FileWriter(ScriptExecutionContext*);
     92 
     93     virtual ~FileWriter();
     94 
     95     // EventTarget
     96     virtual void refEventTarget() { ref(); }
     97     virtual void derefEventTarget() { deref(); }
     98     virtual EventTargetData* eventTargetData() { return &m_eventTargetData; }
     99     virtual EventTargetData* ensureEventTargetData() { return &m_eventTargetData; }
    100 
    101     void fireEvent(const AtomicString& type);
    102 
    103     void setError(FileError::ErrorCode, ExceptionCode&);
    104 
    105     RefPtr<FileError> m_error;
    106     EventTargetData m_eventTargetData;
    107     ReadyState m_readyState;
    108     bool m_startedWriting;
    109     long long m_bytesWritten;
    110     long long m_bytesToWrite;
    111     long long m_truncateLength;
    112     RefPtr<Blob> m_blobBeingWritten;
    113 };
    114 
    115 } // namespace WebCore
    116 
    117 #endif // ENABLE(FILE_SYSTEM)
    118 
    119 #endif // FileWriter_h
    120