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      1 /*
      2  * Copyright (C) 2011 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  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef LineBreakIteratorPoolICU_h
     27 #define LineBreakIteratorPoolICU_h
     28 
     29 #include <unicode/ubrk.h>
     30 #include "core/platform/text/TextBreakIteratorInternalICU.h"
     31 #include "wtf/Assertions.h"
     32 #include "wtf/HashMap.h"
     33 #include "wtf/PassOwnPtr.h"
     34 #include "wtf/text/AtomicString.h"
     35 #include "wtf/text/CString.h"
     36 #include "wtf/ThreadSpecific.h"
     37 
     38 namespace WebCore {
     39 
     40 class LineBreakIteratorPool {
     41     WTF_MAKE_NONCOPYABLE(LineBreakIteratorPool);
     42 public:
     43     static LineBreakIteratorPool& sharedPool()
     44     {
     45         static WTF::ThreadSpecific<LineBreakIteratorPool>* pool = new WTF::ThreadSpecific<LineBreakIteratorPool>;
     46         return **pool;
     47     }
     48 
     49     static PassOwnPtr<LineBreakIteratorPool> create() { return adoptPtr(new LineBreakIteratorPool); }
     50 
     51     UBreakIterator* take(const AtomicString& locale)
     52     {
     53         UBreakIterator* iterator = 0;
     54         for (size_t i = 0; i < m_pool.size(); ++i) {
     55             if (m_pool[i].first == locale) {
     56                 iterator = m_pool[i].second;
     57                 m_pool.remove(i);
     58                 break;
     59             }
     60         }
     61 
     62         if (!iterator) {
     63             UErrorCode openStatus = U_ZERO_ERROR;
     64             bool localeIsEmpty = locale.isEmpty();
     65             iterator = ubrk_open(UBRK_LINE, localeIsEmpty ? currentTextBreakLocaleID() : locale.string().utf8().data(), 0, 0, &openStatus);
     66             // locale comes from a web page and it can be invalid, leading ICU
     67             // to fail, in which case we fall back to the default locale.
     68             if (!localeIsEmpty && U_FAILURE(openStatus)) {
     69                 openStatus = U_ZERO_ERROR;
     70                 iterator = ubrk_open(UBRK_LINE, currentTextBreakLocaleID(), 0, 0, &openStatus);
     71             }
     72 
     73             if (U_FAILURE(openStatus)) {
     74                 LOG_ERROR("ubrk_open failed with status %d", openStatus);
     75                 return 0;
     76             }
     77         }
     78 
     79         ASSERT(!m_vendedIterators.contains(iterator));
     80         m_vendedIterators.set(iterator, locale);
     81         return iterator;
     82     }
     83 
     84     void put(UBreakIterator* iterator)
     85     {
     86         ASSERT_ARG(iterator, m_vendedIterators.contains(iterator));
     87 
     88         if (m_pool.size() == capacity) {
     89             ubrk_close(m_pool[0].second);
     90             m_pool.remove(0);
     91         }
     92 
     93         m_pool.append(Entry(m_vendedIterators.take(iterator), iterator));
     94     }
     95 
     96 private:
     97     LineBreakIteratorPool() { }
     98 
     99     static const size_t capacity = 4;
    100 
    101     typedef pair<AtomicString, UBreakIterator*> Entry;
    102     typedef Vector<Entry, capacity> Pool;
    103     Pool m_pool;
    104     HashMap<UBreakIterator*, AtomicString> m_vendedIterators;
    105 
    106     friend WTF::ThreadSpecific<LineBreakIteratorPool>::operator LineBreakIteratorPool*();
    107 };
    108 
    109 }
    110 
    111 #endif
    112