/**
    * Copyright (c) 2002-2015, JWebUnit team.
    *
    * This file is part of JWebUnit.
    *
    * JWebUnit is free software: you can redistribute it and/or modify
    * it under the terms of the GNU Lesser General Public License as published by
    * the Free Software Foundation, either version 3 of the License, or
    * (at your option) any later version.
   *
   * JWebUnit is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public License
   * along with JWebUnit.  If not, see <http://www.gnu.org/licenses/>.
   */
  /**
   *
   */
  package net.sourceforge.jwebunit.htmlunit;
  
  import com.gargoylesoftware.htmlunit.html.DomElement;
  import com.gargoylesoftware.htmlunit.html.DomNode;
  import com.gargoylesoftware.htmlunit.html.HtmlElement;
  import com.gargoylesoftware.htmlunit.html.HtmlInput;
  import com.gargoylesoftware.htmlunit.html.HtmlOption;
  import com.gargoylesoftware.htmlunit.html.HtmlTextArea;
  import net.sourceforge.jwebunit.api.IElement;
  
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * HtmlUnit implementation of IElement wrapper.
   *
   * @author jmwright
   *
   */
  public class HtmlUnitElementImpl implements IElement {
  
    /**
     * The wrapped element.
     */
    private DomElement element;
  
    public HtmlUnitElementImpl(DomElement element) {
      if (element == null)
        throw new NullPointerException("Cannot create an IElement for a null element.");
      this.element = element;
    }
  
    /*
     * (non-Javadoc)
     * 
     * @see net.sourceforge.jwebunit.api.IElement#attribute(java.lang.String)
     */
    public String getAttribute(String name) {
      if ("value".equals(name) && element instanceof HtmlOption) {
        // for options, we want text if no value was specified
        return ((HtmlOption) element).getValueAttribute();
      } else {
        if (!element.hasAttribute(name))
          return null;
  
        return element.getAttribute(name);
      }
    }
  
    /*
     * (non-Javadoc)
     * 
     * @see net.sourceforge.jwebunit.api.IElement#name()
     */
    public String getName() {
      return element.getNodeName();
    }
  
    /*
     * (non-Javadoc)
     * 
     * @see net.sourceforge.jwebunit.api.IElement#getChildren()
     */
    public List<IElement> getChildren() {
      List<IElement> children = new ArrayList<IElement>();
      for (DomElement e : element.getChildElements()) {
        if (e != null)
          children.add(new HtmlUnitElementImpl(e));
      }
      return children;
    }
  
    /*
     * (non-Javadoc)
     * 
     * @see net.sourceforge.jwebunit.api.IElement#getParent()
     */
    public IElement getParent() {
     DomNode p = element.getParentNode();
     while (true) {
       if (p == null)
         return null;
 
       if (p instanceof HtmlElement)
         return new HtmlUnitElementImpl((HtmlElement) p);
 
       // get next parent
       p = p.getParentNode();
     }
   }
 
   /*
    * (non-Javadoc)
    * 
    * @see net.sourceforge.jwebunit.api.IElement#getTextContent()
    */
   public String getTextContent() {
     return element.getTextContent();
   }
 
   /*
    * (non-Javadoc)
    * 
    * @see net.sourceforge.jwebunit.api.IElement#getElement(java.lang.String)
    */
   public IElement getElement(String xpath) {
     // if this fails with a ClassCastException, use getElements().get(0) (performance penalty)
     return new HtmlUnitElementImpl((HtmlElement) element.getFirstByXPath(xpath));
   }
 
   /*
    * (non-Javadoc)
    * 
    * @see net.sourceforge.jwebunit.api.IElement#getElements(java.lang.String)
    */
   public List<IElement> getElements(String xpath) {
     List<IElement> elements = new ArrayList<IElement>();
     for (Object o : element.getByXPath(xpath)) {
       if (o instanceof HtmlElement)
         elements.add(new HtmlUnitElementImpl((HtmlElement) o));
     }
     return elements;
   }
 
   public String toString() {
     return "IElement[name=" + getName() + " wrapped=" + element + "]";
   }
 
   /*
    * (non-Javadoc)
    * 
    * @see net.sourceforge.jwebunit.api.IElement#setAttribute(java.lang.String)
    */
   public void setAttribute(String string) {
     element.setAttributeNS(null, string, "1");
   }
 
   /*
    * (non-Javadoc)
    * 
    * @see net.sourceforge.jwebunit.api.IElement#setAttribute(java.lang.String, java.lang.String)
    */
   public void setAttribute(String name, String value) {
     if ("value".equals(name) && element instanceof HtmlInput) {
       // for HtmlInputs, we want to run any onChange code if the value changes
       ((HtmlInput) element).setValueAttribute(value);
     } else {
       element.setAttribute(name, value);
     }
   }
 
   /*
    * (non-Javadoc)
    * 
    * @see net.sourceforge.jwebunit.api.IElement#setTextContent(java.lang.String)
    */
   public void setTextContent(String value) {
     if (element instanceof HtmlTextArea) {
       ((HtmlTextArea) element).setText(value);
     } else {
       element.setTextContent(value);
     }
   }
 
   @Override
   public int hashCode() {
     final int prime = 31;
     int result = 1;
     result = prime * result + ((element == null) ? 0 : element.hashCode());
     return result;
   }
 
   @Override
   public boolean equals(Object obj) {
     if (this == obj)
       return true;
     if (obj == null)
       return false;
     if (getClass() != obj.getClass())
       return false;
     final HtmlUnitElementImpl other = (HtmlUnitElementImpl) obj;
     if (element == null) {
       if (other.element != null)
         return false;
     } else if (!element.equals(other.element))
       return false;
     return true;
   }
 
   /**
    * Return the unwrapped HtmlUnit element that this IElement represents.
    *
    * @return the HtmlUnit element this IElement represents.
    */
   public DomElement getHtmlElement() {
     return element;
   }
 
 }