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   *
   *  AndroidIDE is free software: you can redistribute it and/or modify
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   *  the Free Software Foundation, either version 3 of the License, or
   *  (at your option) any later version.
   *
   *  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: UnionPattern.java,v 1.2.4.1 2005/09/15 00:21:15 jeffsuttor Exp $
   */
  package jaxp.sun.org.apache.xpath.internal.patterns;
  
  import jaxp.sun.org.apache.xpath.internal.Expression;
  import jaxp.sun.org.apache.xpath.internal.ExpressionOwner;
  import jaxp.sun.org.apache.xpath.internal.XPathContext;
  import jaxp.sun.org.apache.xpath.internal.XPathVisitable;
  import jaxp.sun.org.apache.xpath.internal.XPathVisitor;
  import jaxp.sun.org.apache.xpath.internal.objects.XObject;
  import jaxp.xml.transform.TransformerException;
  
  /**
   * This class represents a union pattern, which can have multiple individual
   * StepPattern patterns.
   * @xsl.usage advanced
   */
  public class UnionPattern extends Expression
  {
      static final long serialVersionUID = -6670449967116905820L;
  
    /** Array of the contained step patterns to be tested.
     *  @serial  */
    private StepPattern[] m_patterns;
  
    /**
     * No arguments to process, so this does nothing.
     */
    public void fixupVariables(java.util.Vector vars, int globalsSize)
    {
      for (int i = 0; i < m_patterns.length; i++)
      {
        m_patterns[i].fixupVariables(vars, globalsSize);
      }
    }
  
  
    /**
     * 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()
     {
       if(null != m_patterns)
       {
        int n = m_patterns.length;
        for (int i = 0; i < n; i++)
        {
          if(m_patterns[i].canTraverseOutsideSubtree())
            return true;
        }
       }
       return false;
     }
  
    /**
     * Set the contained step patterns to be tested.
     *
     *
     * @param patterns the contained step patterns to be tested.
     */
    public void setPatterns(StepPattern[] patterns)
    {
      m_patterns = patterns;
      if(null != patterns)
      {
          for(int i = 0; i < patterns.length; i++)
          {
                  patterns[i].exprSetParent(this);
          }
      }
  
    }
  
    /**
     * Get the contained step patterns to be tested.
     *
     *
     * @return an array of the contained step patterns to be tested.
     */
    public StepPattern[] getPatterns()
    {
      return m_patterns;
    }
  
    /**
     * Test a node to see if it matches any of the patterns in the union.
     *
     * @param xctxt XPath runtime context.
     *
     * @return {@link NodeTest#SCORE_NODETEST},
     *         {@link NodeTest#SCORE_NONE},
     *         {@link NodeTest#SCORE_NSWILD},
     *         {@link NodeTest#SCORE_QNAME}, or
     *         {@link NodeTest#SCORE_OTHER}.
     *
     * @throws TransformerException
     */
    public XObject execute(XPathContext xctxt) throws TransformerException
    {
  
      XObject bestScore = null;
      int n = m_patterns.length;
  
      for (int i = 0; i < n; i++)
      {
        XObject score = m_patterns[i].execute(xctxt);
  
        if (score != NodeTest.SCORE_NONE)
        {
          if (null == bestScore)
            bestScore = score;
          else if (score.num() > bestScore.num())
            bestScore = score;
        }
      }
  
      if (null == bestScore)
      {
        bestScore = NodeTest.SCORE_NONE;
      }
  
      return bestScore;
    }
  
    class UnionPathPartOwner implements ExpressionOwner
    {
          int m_index;
  
          UnionPathPartOwner(int index)
          {
                  m_index = index;
          }
  
      /**
       * @see ExpressionOwner#getExpression()
       */
      public Expression getExpression()
      {
        return m_patterns[m_index];
      }
  
  
      /**
       * @see ExpressionOwner#setExpression(Expression)
       */
      public void setExpression(Expression exp)
      {
          exp.exprSetParent(UnionPattern.this);
          m_patterns[m_index] = (StepPattern)exp;
      }
    }
  
    /**
     * @see XPathVisitable#callVisitors(ExpressionOwner, XPathVisitor)
     */
    public void callVisitors(ExpressionOwner owner, XPathVisitor visitor)
    {
          visitor.visitUnionPattern(owner, this);
          if(null != m_patterns)
          {
                  int n = m_patterns.length;
                  for(int i = 0; i < n; i++)
                  {
                          m_patterns[i].callVisitors(new UnionPathPartOwner(i), visitor);
                  }
          }
    }
  
    /**
     * @see Expression#deepEquals(Expression)
     */
    public boolean deepEquals(Expression expr)
    {
          if(!isSameClass(expr))
                  return false;
  
          UnionPattern up = (UnionPattern)expr;
  
          if(null != m_patterns)
          {
                  int n = m_patterns.length;
                  if((null == up.m_patterns) || (up.m_patterns.length != n))
                          return false;
  
                  for(int i = 0; i < n; i++)
                  {
                          if(!m_patterns[i].deepEquals(up.m_patterns[i]))
                                  return false;
                  }
          }
          else if(up.m_patterns != null)
                  return false;
  
          return true;
  
    }
  
  
  }
  