src/third_party/WebKit/Source/core/xml/DocumentXPathEvaluator.cpp

   1 /*
   2  * Copyright (C) 2013 Google, Inc.
   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 COMPUTER, 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 COMPUTER, 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 #include "config.h"
  27 #include "core/xml/DocumentXPathEvaluator.h"
  28
  29 #include "bindings/core/v8/ExceptionState.h"
  30 #include "core/xml/XPathExpression.h"
  31 #include "core/xml/XPathResult.h"
  32
  33 namespace blink {
  34
  35 DocumentXPathEvaluator::DocumentXPathEvaluator()
  36 {
  37 }
  38
  39 DocumentXPathEvaluator& DocumentXPathEvaluator::from(DocumentSupplementable& document)
  40 {
  41     DocumentXPathEvaluator* cache = static_cast<DocumentXPathEvaluator*>(DocumentSupplement::from(document, supplementName()));
  42     if (!cache) {
  43         cache = new DocumentXPathEvaluator();
  44         DocumentSupplement::provideTo(document, supplementName(), adoptPtrWillBeNoop(cache));
  45     }
  46     return *cache;
  47 }
  48
  49 PassRefPtrWillBeRawPtr<XPathExpression> DocumentXPathEvaluator::createExpression(DocumentSupplementable& document,
  50     const String& expression, PassRefPtrWillBeRawPtr<XPathNSResolver> resolver, ExceptionState& exceptionState)
  51 {
  52     DocumentXPathEvaluator& suplement = from(document);
  53     if (!suplement.m_xpathEvaluator)
  54         suplement.m_xpathEvaluator = XPathEvaluator::create();
  55     return suplement.m_xpathEvaluator->createExpression(expression, resolver, exceptionState);
  56 }
  57
  58 PassRefPtrWillBeRawPtr<XPathNSResolver> DocumentXPathEvaluator::createNSResolver(DocumentSupplementable& document, Node* nodeResolver)
  59 {
  60     DocumentXPathEvaluator& suplement = from(document);
  61     if (!suplement.m_xpathEvaluator)
  62         suplement.m_xpathEvaluator = XPathEvaluator::create();
  63     return suplement.m_xpathEvaluator->createNSResolver(nodeResolver);
  64 }
  65
  66 PassRefPtrWillBeRawPtr<XPathResult> DocumentXPathEvaluator::evaluate(DocumentSupplementable& document, const String& expression,
  67     Node* contextNode, PassRefPtrWillBeRawPtr<XPathNSResolver> resolver, unsigned short type,
  68     XPathResult* result, ExceptionState& exceptionState)
  69 {
  70     DocumentXPathEvaluator& suplement = from(document);
  71     if (!suplement.m_xpathEvaluator)
  72         suplement.m_xpathEvaluator = XPathEvaluator::create();
  73     return suplement.m_xpathEvaluator->evaluate(expression, contextNode, resolver, type, result, exceptionState);
  74 }
  75
  76 void DocumentXPathEvaluator::trace(Visitor* visitor)
  77 {
  78     visitor->trace(m_xpathEvaluator);
  79     DocumentSupplement::trace(visitor);
  80 }
  81
  82 } // namespace blink