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The XPath engine used by HtmlUnit.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the  "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package net.sourceforge.htmlunit.xpath.operations;

import net.sourceforge.htmlunit.xpath.XPathContext;
import net.sourceforge.htmlunit.xpath.objects.XBoolean;
import net.sourceforge.htmlunit.xpath.objects.XObject;

/** The '=' operation expression executer. */
public class Equals extends Operation {

  /** {@inheritDoc} */
  @Override
  public XObject operate(XObject left, XObject right)
      throws javax.xml.transform.TransformerException {
    return left.equals(right) ? XBoolean.S_TRUE : XBoolean.S_FALSE;
  }

  /** {@inheritDoc} */
  @Override
  public boolean bool(XPathContext xctxt) throws javax.xml.transform.TransformerException {
    XObject left = m_left.execute(xctxt, true);
    XObject right = m_right.execute(xctxt, true);

    boolean result = left.equals(right);
    left.detach();
    right.detach();
    return result;
  }
}