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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/dom/NamedFlow.h"
     37 #include "core/inspector/InspectorInstrumentation.h"
     38 #include "wtf/text/StringHash.h"
     39 #include "wtf/text/WTFString.h"
     40 
     41 namespace WebCore {
     42 
     43 NamedFlowCollection::NamedFlowCollection(Document* document)
     44     : ContextLifecycleObserver(document)
     45 {
     46     ASSERT(RuntimeEnabledFeatures::cssRegionsEnabled());
     47 }
     48 
     49 Vector<RefPtr<NamedFlow> > NamedFlowCollection::namedFlows()
     50 {
     51     Vector<RefPtr<NamedFlow> > namedFlows;
     52 
     53     for (NamedFlowSet::iterator it = m_namedFlows.begin(); it != m_namedFlows.end(); ++it) {
     54         if ((*it)->flowState() == NamedFlow::FlowStateNull)
     55             continue;
     56 
     57         namedFlows.append(RefPtr<NamedFlow>(*it));
     58     }
     59 
     60     return namedFlows;
     61 }
     62 
     63 NamedFlow* NamedFlowCollection::flowByName(const String& flowName)
     64 {
     65     NamedFlowSet::iterator it = m_namedFlows.find<String, NamedFlowHashTranslator>(flowName);
     66     if (it == m_namedFlows.end() || (*it)->flowState() == NamedFlow::FlowStateNull)
     67         return 0;
     68 
     69     return *it;
     70 }
     71 
     72 PassRefPtr<NamedFlow> NamedFlowCollection::ensureFlowWithName(const String& flowName)
     73 {
     74     NamedFlowSet::iterator it = m_namedFlows.find<String, NamedFlowHashTranslator>(flowName);
     75     if (it != m_namedFlows.end()) {
     76         NamedFlow* namedFlow = *it;
     77         ASSERT(namedFlow->flowState() == NamedFlow::FlowStateNull);
     78 
     79         return namedFlow;
     80     }
     81 
     82     RefPtr<NamedFlow> newFlow = NamedFlow::create(this, flowName);
     83     m_namedFlows.add(newFlow.get());
     84 
     85     InspectorInstrumentation::didCreateNamedFlow(document(), newFlow.get());
     86 
     87     return newFlow.release();
     88 }
     89 
     90 void NamedFlowCollection::discardNamedFlow(NamedFlow* namedFlow)
     91 {
     92     // The document is not valid anymore so the collection will be destroyed anyway.
     93     if (!document())
     94         return;
     95 
     96     ASSERT(namedFlow->flowState() == NamedFlow::FlowStateNull);
     97     ASSERT(m_namedFlows.contains(namedFlow));
     98 
     99     InspectorInstrumentation::willRemoveNamedFlow(document(), namedFlow);
    100 
    101     m_namedFlows.remove(namedFlow);
    102 }
    103 
    104 Document* NamedFlowCollection::document() const
    105 {
    106     ScriptExecutionContext* context = ContextLifecycleObserver::scriptExecutionContext();
    107     return toDocument(context);
    108 }
    109 
    110 PassRefPtr<DOMNamedFlowCollection> NamedFlowCollection::createCSSOMSnapshot()
    111 {
    112     Vector<NamedFlow*> createdFlows;
    113     for (NamedFlowSet::iterator it = m_namedFlows.begin(); it != m_namedFlows.end(); ++it)
    114         if ((*it)->flowState() == NamedFlow::FlowStateCreated)
    115             createdFlows.append(*it);
    116     return DOMNamedFlowCollection::create(createdFlows);
    117 }
    118 
    119 // The HashFunctions object used by the HashSet to compare between NamedFlows.
    120 // It is safe to set safeToCompareToEmptyOrDeleted because the HashSet will never contain null pointers or deleted values.
    121 struct NamedFlowCollection::NamedFlowHashFunctions {
    122     static unsigned hash(NamedFlow* key) { return DefaultHash<String>::Hash::hash(key->name()); }
    123     static bool equal(NamedFlow* a, NamedFlow* b) { return a->name() == b->name(); }
    124     static const bool safeToCompareToEmptyOrDeleted = true;
    125 };
    126 
    127 // The HashTranslator is used to lookup a NamedFlow in the set using a name.
    128 struct NamedFlowCollection::NamedFlowHashTranslator {
    129     static unsigned hash(const String& key) { return DefaultHash<String>::Hash::hash(key); }
    130     static bool equal(NamedFlow* a, const String& b) { return a->name() == b; }
    131 };
    132 
    133 } // namespace WebCore
    134