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

/*
 * Copyright (C) 2013 Google, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "core/xml/DocumentXPathEvaluator.h"

#include "bindings/core/v8/ExceptionState.h"
#include "core/xml/XPathExpression.h"
#include "core/xml/XPathResult.h"

namespace blink {

DocumentXPathEvaluator::DocumentXPathEvaluator() {}

DocumentXPathEvaluator& DocumentXPathEvaluator::from(
    Supplementable<Document>& document) {
  DocumentXPathEvaluator* cache = static_cast<DocumentXPathEvaluator*>(
      Supplement<Document>::from(document, supplementName()));
  if (!cache) {
    cache = new DocumentXPathEvaluator;
    Supplement<Document>::provideTo(document, supplementName(), cache);
  }
  return *cache;
}

XPathExpression* DocumentXPathEvaluator::createExpression(
    Supplementable<Document>& document,
    const String& expression,
    XPathNSResolver* resolver,
    ExceptionState& exceptionState) {
  DocumentXPathEvaluator& suplement = from(document);
  if (!suplement.m_xpathEvaluator)
    suplement.m_xpathEvaluator = XPathEvaluator::create();
  return suplement.m_xpathEvaluator->createExpression(expression, resolver,
                                                      exceptionState);
}

XPathNSResolver* DocumentXPathEvaluator::createNSResolver(
    Supplementable<Document>& document,
    Node* nodeResolver) {
  DocumentXPathEvaluator& suplement = from(document);
  if (!suplement.m_xpathEvaluator)
    suplement.m_xpathEvaluator = XPathEvaluator::create();
  return suplement.m_xpathEvaluator->createNSResolver(nodeResolver);
}

XPathResult* DocumentXPathEvaluator::evaluate(
    Supplementable<Document>& document,
    const String& expression,
    Node* contextNode,
    XPathNSResolver* resolver,
    unsigned short type,
    const ScriptValue&,
    ExceptionState& exceptionState) {
  DocumentXPathEvaluator& suplement = from(document);
  if (!suplement.m_xpathEvaluator)
    suplement.m_xpathEvaluator = XPathEvaluator::create();
  return suplement.m_xpathEvaluator->evaluate(
      expression, contextNode, resolver, type, ScriptValue(), exceptionState);
}

DEFINE_TRACE(DocumentXPathEvaluator) {
  visitor->trace(m_xpathEvaluator);
  Supplement<Document>::trace(visitor);
}

}  // namespace blink