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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
      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  *
     14  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
     15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     16  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     17  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     18  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     19  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     20  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     21  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "IDBIndex.h"
     28 
     29 #if ENABLE(INDEXED_DATABASE)
     30 
     31 #include "IDBCursorBackendInterface.h"
     32 #include "IDBDatabaseException.h"
     33 #include "IDBIndexBackendInterface.h"
     34 #include "IDBKey.h"
     35 #include "IDBKeyRange.h"
     36 #include "IDBObjectStore.h"
     37 #include "IDBRequest.h"
     38 #include "IDBTransaction.h"
     39 
     40 namespace WebCore {
     41 
     42 static const unsigned short defaultDirection = IDBCursor::NEXT;
     43 
     44 IDBIndex::IDBIndex(PassRefPtr<IDBIndexBackendInterface> backend, IDBObjectStore* objectStore, IDBTransaction* transaction)
     45     : m_backend(backend)
     46     , m_objectStore(objectStore)
     47     , m_transaction(transaction)
     48 {
     49     ASSERT(m_backend);
     50     ASSERT(m_objectStore);
     51     ASSERT(m_transaction);
     52 }
     53 
     54 IDBIndex::~IDBIndex()
     55 {
     56 }
     57 
     58 PassRefPtr<IDBRequest> IDBIndex::openCursor(ScriptExecutionContext* context, PassRefPtr<IDBKeyRange> keyRange, unsigned short direction, ExceptionCode& ec)
     59 {
     60     if (direction != IDBCursor::NEXT && direction != IDBCursor::NEXT_NO_DUPLICATE && direction != IDBCursor::PREV && direction != IDBCursor::PREV_NO_DUPLICATE) {
     61         // FIXME: May need to change when specced: http://www.w3.org/Bugs/Public/show_bug.cgi?id=11406
     62         ec = IDBDatabaseException::CONSTRAINT_ERR;
     63         return 0;
     64     }
     65 
     66     RefPtr<IDBRequest> request = IDBRequest::create(context, IDBAny::create(this), m_transaction.get());
     67     request->setCursorType(IDBCursorBackendInterface::IndexCursor);
     68     m_backend->openCursor(keyRange, direction, request, m_transaction->backend(), ec);
     69     if (ec) {
     70         request->markEarlyDeath();
     71         return 0;
     72     }
     73     return request;
     74 }
     75 
     76 PassRefPtr<IDBRequest> IDBIndex::openKeyCursor(ScriptExecutionContext* context, PassRefPtr<IDBKeyRange> keyRange, unsigned short direction, ExceptionCode& ec)
     77 {
     78     if (direction != IDBCursor::NEXT && direction != IDBCursor::NEXT_NO_DUPLICATE && direction != IDBCursor::PREV && direction != IDBCursor::PREV_NO_DUPLICATE) {
     79         // FIXME: May need to change when specced: http://www.w3.org/Bugs/Public/show_bug.cgi?id=11406
     80         ec = IDBDatabaseException::CONSTRAINT_ERR;
     81         return 0;
     82     }
     83 
     84     RefPtr<IDBRequest> request = IDBRequest::create(context, IDBAny::create(this), m_transaction.get());
     85     request->setCursorType(IDBCursorBackendInterface::IndexKeyCursor);
     86     m_backend->openKeyCursor(keyRange, direction, request, m_transaction->backend(), ec);
     87     if (ec) {
     88         request->markEarlyDeath();
     89         return 0;
     90     }
     91     return request;
     92 }
     93 
     94 PassRefPtr<IDBRequest> IDBIndex::get(ScriptExecutionContext* context, PassRefPtr<IDBKey> key, ExceptionCode& ec)
     95 {
     96     RefPtr<IDBRequest> request = IDBRequest::create(context, IDBAny::create(this), m_transaction.get());
     97     m_backend->get(key, request, m_transaction->backend(), ec);
     98     if (ec) {
     99         request->markEarlyDeath();
    100         return 0;
    101     }
    102     return request;
    103 }
    104 
    105 PassRefPtr<IDBRequest> IDBIndex::getKey(ScriptExecutionContext* context, PassRefPtr<IDBKey> key, ExceptionCode& ec)
    106 {
    107     RefPtr<IDBRequest> request = IDBRequest::create(context, IDBAny::create(this), m_transaction.get());
    108     m_backend->getKey(key, request, m_transaction->backend(), ec);
    109     if (ec) {
    110         request->markEarlyDeath();
    111         return 0;
    112     }
    113     return request;
    114 }
    115 
    116 } // namespace WebCore
    117 
    118 #endif // ENABLE(INDEXED_DATABASE)
    119