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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 #include "config.h"
     32 #include "modules/filesystem/DirectoryReader.h"
     33 
     34 #include "core/fileapi/FileError.h"
     35 #include "modules/filesystem/EntriesCallback.h"
     36 #include "modules/filesystem/Entry.h"
     37 #include "modules/filesystem/ErrorCallback.h"
     38 
     39 namespace WebCore {
     40 
     41 class DirectoryReader::EntriesCallbackHelper : public EntriesCallback {
     42 public:
     43     explicit EntriesCallbackHelper(DirectoryReader* reader)
     44         : m_reader(reader)
     45     {
     46     }
     47 
     48     virtual void handleEvent(const EntryHeapVector& entries) OVERRIDE
     49     {
     50         m_reader->addEntries(entries);
     51     }
     52 
     53 private:
     54     // FIXME: This Persistent keeps the reader alive until all of the readDirectory results are received. crbug.com/350285
     55     Persistent<DirectoryReader> m_reader;
     56 };
     57 
     58 class DirectoryReader::ErrorCallbackHelper : public ErrorCallback {
     59 public:
     60     explicit ErrorCallbackHelper(DirectoryReader* reader)
     61         : m_reader(reader)
     62     {
     63     }
     64 
     65     virtual void handleEvent(FileError* error) OVERRIDE
     66     {
     67         m_reader->onError(error);
     68     }
     69 
     70 private:
     71     Persistent<DirectoryReader> m_reader;
     72 };
     73 
     74 DirectoryReader::DirectoryReader(DOMFileSystemBase* fileSystem, const String& fullPath)
     75     : DirectoryReaderBase(fileSystem, fullPath)
     76     , m_isReading(false)
     77 {
     78     ScriptWrappable::init(this);
     79 }
     80 
     81 DirectoryReader::~DirectoryReader()
     82 {
     83 }
     84 
     85 void DirectoryReader::readEntries(PassOwnPtr<EntriesCallback> entriesCallback, PassOwnPtr<ErrorCallback> errorCallback)
     86 {
     87     if (!m_isReading) {
     88         m_isReading = true;
     89         filesystem()->readDirectory(this, m_fullPath, adoptPtr(new EntriesCallbackHelper(this)), adoptPtr(new ErrorCallbackHelper(this)));
     90     }
     91 
     92     if (m_error) {
     93         filesystem()->scheduleCallback(errorCallback, PassRefPtrWillBeRawPtr<FileError>(m_error.get()));
     94         return;
     95     }
     96 
     97     if (m_entriesCallback) {
     98         // Non-null m_entriesCallback means multiple readEntries() calls are made concurrently. We don't allow doing it.
     99         filesystem()->scheduleCallback(errorCallback, FileError::create(FileError::INVALID_STATE_ERR));
    100         return;
    101     }
    102 
    103     if (!m_hasMoreEntries || !m_entries.isEmpty()) {
    104         filesystem()->scheduleCallback(entriesCallback, m_entries);
    105         m_entries.clear();
    106         return;
    107     }
    108 
    109     m_entriesCallback = entriesCallback;
    110     m_errorCallback = errorCallback;
    111 }
    112 
    113 void DirectoryReader::addEntries(const EntryHeapVector& entries)
    114 {
    115     m_entries.appendVector(entries);
    116     m_errorCallback = nullptr;
    117     if (m_entriesCallback) {
    118         OwnPtr<EntriesCallback> entriesCallback = m_entriesCallback.release();
    119         EntryHeapVector entries;
    120         entries.swap(m_entries);
    121         entriesCallback->handleEvent(entries);
    122     }
    123 }
    124 
    125 void DirectoryReader::onError(FileError* error)
    126 {
    127     m_error = error;
    128     m_entriesCallback = nullptr;
    129     if (m_errorCallback) {
    130         OwnPtr<ErrorCallback> errorCallback = m_errorCallback.release();
    131         errorCallback->handleEvent(error);
    132     }
    133 }
    134 
    135 void DirectoryReader::trace(Visitor* visitor)
    136 {
    137     visitor->trace(m_entries);
    138     visitor->trace(m_error);
    139     DirectoryReaderBase::trace(visitor);
    140 }
    141 
    142 }
    143