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   *
   *  AndroidIDE 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 General Public License
   *   along with AndroidIDE.  If not, see <https://www.gnu.org/licenses/>.
   */
  
  /*
   * reserved comment block
   * DO NOT REMOVE OR ALTER!
   */
  /*
   * Copyright 1999-2004 The Apache Software Foundation.
   *
   * Licensed 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.
   */
  /*
   * $Id: Function2Args.java,v 1.2.4.1 2005/09/14 20:18:46 jeffsuttor Exp $
   */
  package jaxp.sun.org.apache.xpath.internal.functions;
  
  import jaxp.sun.org.apache.xalan.internal.res.XSLMessages;
  import jaxp.sun.org.apache.xpath.internal.Expression;
  import jaxp.sun.org.apache.xpath.internal.ExpressionOwner;
  import jaxp.sun.org.apache.xpath.internal.XPathVisitor;
  import jaxp.sun.org.apache.xpath.internal.XPathVisitable;
  
  /**
   * Base class for functions that accept two arguments.
   * @xsl.usage advanced
   */
  public class Function2Args extends FunctionOneArg
  {
      static final long serialVersionUID = 5574294996842710641L;
  
    /** The second argument passed to the function (at index 1).
     *  @serial  */
    Expression m_arg1;
  
    /**
     * Return the second argument passed to the function (at index 1).
     *
     * @return An expression that represents the second argument passed to the
     *         function.
     */
    public Expression getArg1()
    {
      return m_arg1;
    }
  
    /**
     * This function is used to fixup variables from QNames to stack frame
     * indexes at stylesheet build time.
     * @param vars List of QNames that correspond to variables.  This list
     * should be searched backwards for the first qualified name that
     * corresponds to the variable reference qname.  The position of the
     * QName in the vector from the start of the vector will be its position
     * in the stack frame (but variables above the globalsTop value will need
     * to be offset to the current stack frame).
     */
    public void fixupVariables(java.util.Vector vars, int globalsSize)
    {
      super.fixupVariables(vars, globalsSize);
      if(null != m_arg1)
        m_arg1.fixupVariables(vars, globalsSize);
    }
  
  
    /**
     * Set an argument expression for a function.  This method is called by the
     * XPath compiler.
     *
     * @param arg non-null expression that represents the argument.
     * @param argNum The argument number index.
     *
     * @throws WrongNumberArgsException If the argNum parameter is greater than 1.
     */
    public void setArg(Expression arg, int argNum)
            throws WrongNumberArgsException
    {
  
      // System.out.println("argNum: "+argNum);
      if (argNum == 0)
        super.setArg(arg, argNum);
      else if (1 == argNum)
      {
        m_arg1 = arg;
        arg.exprSetParent(this);
      }
      else
                    reportWrongNumberArgs();
    }
  
    /**
     * Check that the number of arguments passed to this function is correct.
     *
     *
     * @param argNum The number of arguments that is being passed to the function.
     *
     * @throws WrongNumberArgsException
     */
    public void checkNumberArgs(int argNum) throws WrongNumberArgsException
    {
      if (argNum != 2)
        reportWrongNumberArgs();
    }
  
    /**
     * Constructs and throws a WrongNumberArgException with the appropriate
     * message for this function object.
     *
     * @throws WrongNumberArgsException
     */
    protected void reportWrongNumberArgs() throws WrongNumberArgsException {
        throw new WrongNumberArgsException(XSLMessages.createXPATHMessage("two", null));
    }
  
    /**
     * Tell if this expression or it's subexpressions can traverse outside
     * the current subtree.
     *
     * @return true if traversal outside the context node's subtree can occur.
     */
     public boolean canTraverseOutsideSubtree()
     {
      return super.canTraverseOutsideSubtree()
      ? true : m_arg1.canTraverseOutsideSubtree();
     }
  
    class Arg1Owner implements ExpressionOwner
    {
      /**
       * @see ExpressionOwner#getExpression()
       */
      public Expression getExpression()
      {
        return m_arg1;
      }
  
  
      /**
       * @see ExpressionOwner#setExpression(Expression)
       */
      public void setExpression(Expression exp)
      {
          exp.exprSetParent(Function2Args.this);
          m_arg1 = exp;
      }
    }
  
  
    /**
     * @see XPathVisitable#callVisitors(ExpressionOwner, XPathVisitor)
     */
    public void callArgVisitors(XPathVisitor visitor)
    {
          super.callArgVisitors(visitor);
          if(null != m_arg1)
                  m_arg1.callVisitors(new Arg1Owner(), visitor);
    }
  
    /**
     * @see Expression#deepEquals(Expression)
     */
    public boolean deepEquals(Expression expr)
    {
          if(!super.deepEquals(expr))
                  return false;
  
          if(null != m_arg1)
          {
                  if(null == ((Function2Args)expr).m_arg1)
                          return false;
  
                  if(!m_arg1.deepEquals(((Function2Args)expr).m_arg1))
                          return false;
          }
          else if(null != ((Function2Args)expr).m_arg1)
                  return false;
  
          return true;
    }
  
  }
  