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      1 /*
      2  * Copyright (C) 2012 Adobe Systems Incorporated. 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
      9  *    copyright notice, this list of conditions and the following
     10  *    disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above
     12  *    copyright notice, this list of conditions and the following
     13  *    disclaimer in the documentation and/or other materials
     14  *    provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER "AS IS" AND ANY
     17  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
     20  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
     21  * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     22  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     23  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
     25  * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
     26  * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     27  * SUCH DAMAGE.
     28  */
     29 
     30 #include "config.h"
     31 #include "core/dom/NamedFlowCollection.h"
     32 
     33 #include "RuntimeEnabledFeatures.h"
     34 #include "core/dom/DOMNamedFlowCollection.h"
     35 #include "core/dom/Document.h"
     36 #include "core/inspector/InspectorInstrumentation.h"
     37 #include "wtf/text/StringHash.h"
     38 #include "wtf/text/WTFString.h"
     39 
     40 namespace WebCore {
     41 
     42 NamedFlowCollection::NamedFlowCollection(Document* document)
     43     : DocumentLifecycleObserver(document)
     44 {
     45     ASSERT(RuntimeEnabledFeatures::cssRegionsEnabled());
     46 }
     47 
     48 Vector<RefPtr<NamedFlow> > NamedFlowCollection::namedFlows()
     49 {
     50     Vector<RefPtr<NamedFlow> > namedFlows;
     51 
     52     for (NamedFlowSet::iterator it = m_namedFlows.begin(); it != m_namedFlows.end(); ++it) {
     53         if ((*it)->flowState() == NamedFlow::FlowStateNull)
     54             continue;
     55 
     56         namedFlows.append(RefPtr<NamedFlow>(*it));
     57     }
     58 
     59     return namedFlows;
     60 }
     61 
     62 NamedFlow* NamedFlowCollection::flowByName(const String& flowName)
     63 {
     64     NamedFlowSet::iterator it = m_namedFlows.find<NamedFlowHashTranslator>(flowName);
     65     if (it == m_namedFlows.end() || (*it)->flowState() == NamedFlow::FlowStateNull)
     66         return 0;
     67 
     68     return *it;
     69 }
     70 
     71 PassRefPtr<NamedFlow> NamedFlowCollection::ensureFlowWithName(const String& flowName)
     72 {
     73     NamedFlowSet::iterator it = m_namedFlows.find<NamedFlowHashTranslator>(flowName);
     74     if (it != m_namedFlows.end()) {
     75         NamedFlow* namedFlow = *it;
     76         ASSERT(namedFlow->flowState() == NamedFlow::FlowStateNull);
     77 
     78         return namedFlow;
     79     }
     80 
     81     RefPtr<NamedFlow> newFlow = NamedFlow::create(this, flowName);
     82     m_namedFlows.add(newFlow.get());
     83 
     84     InspectorInstrumentation::didCreateNamedFlow(document(), newFlow.get());
     85 
     86     return newFlow.release();
     87 }
     88 
     89 void NamedFlowCollection::discardNamedFlow(NamedFlow* namedFlow)
     90 {
     91     // The document is not valid anymore so the collection will be destroyed anyway.
     92     if (!document())
     93         return;
     94 
     95     ASSERT(namedFlow->flowState() == NamedFlow::FlowStateNull);
     96     ASSERT(m_namedFlows.contains(namedFlow));
     97 
     98     InspectorInstrumentation::willRemoveNamedFlow(document(), namedFlow);
     99 
    100     m_namedFlows.remove(namedFlow);
    101 }
    102 
    103 Document* NamedFlowCollection::document() const
    104 {
    105     return lifecycleContext();
    106 }
    107 
    108 PassRefPtr<DOMNamedFlowCollection> NamedFlowCollection::createCSSOMSnapshot()
    109 {
    110     Vector<NamedFlow*> createdFlows;
    111     for (NamedFlowSet::iterator it = m_namedFlows.begin(); it != m_namedFlows.end(); ++it)
    112         if ((*it)->flowState() == NamedFlow::FlowStateCreated)
    113             createdFlows.append(*it);
    114     return DOMNamedFlowCollection::create(createdFlows);
    115 }
    116 
    117 // The HashFunctions object used by the HashSet to compare between NamedFlows.
    118 // It is safe to set safeToCompareToEmptyOrDeleted because the HashSet will never contain null pointers or deleted values.
    119 struct NamedFlowCollection::NamedFlowHashFunctions {
    120     static unsigned hash(NamedFlow* key) { return DefaultHash<String>::Hash::hash(key->name()); }
    121     static bool equal(NamedFlow* a, NamedFlow* b) { return a->name() == b->name(); }
    122     static const bool safeToCompareToEmptyOrDeleted = true;
    123 };
    124 
    125 // The HashTranslator is used to lookup a NamedFlow in the set using a name.
    126 struct NamedFlowCollection::NamedFlowHashTranslator {
    127     static unsigned hash(const String& key) { return DefaultHash<String>::Hash::hash(key); }
    128     static bool equal(NamedFlow* a, const String& b) { return a->name() == b; }
    129 };
    130 
    131 } // namespace WebCore
    132