xnodeset.java

java1.6众多例子参考

      // does not mean the same as not($x!="foo"): the former 
      // is true if and only if some node in $x has the string-value 
      // foo; the latter is true if and only if all nodes in $x have 
      // the string-value foo.
      DTMIterator list1 = iterRaw();
      DTMIterator list2 = ((XNodeSet) obj2).iterRaw();
      int node1;
      java.util.Vector node2Strings = null;

      while (DTM.NULL != (node1 = list1.nextNode()))
      {
        XMLString s1 = getStringFromNode(node1);

        if (null == node2Strings)
        {
          int node2;

          while (DTM.NULL != (node2 = list2.nextNode()))
          {
            XMLString s2 = getStringFromNode(node2);

            if (comparator.compareStrings(s1, s2))
            {
              result = true;

              break;
            }

            if (null == node2Strings)
              node2Strings = new java.util.Vector();

            node2Strings.addElement(s2);
          }
        }
        else
        {
          int n = node2Strings.size();

          for (int i = 0; i < n; i++)
          {
            if (comparator.compareStrings(s1, (XMLString)node2Strings.elementAt(i)))
            {
              result = true;

              break;
            }
          }
        }
      }
      list1.reset();
      list2.reset();
    }
    else if (XObject.CLASS_BOOLEAN == type)
    {

      // From http://www.w3.org/TR/xpath: 
      // If one object to be compared is a node-set and the other is a boolean, 
      // then the comparison will be true if and only if the result of 
      // performing the comparison on the boolean and on the result of 
      // converting the node-set to a boolean using the boolean function 
      // is true.
      double num1 = bool() ? 1.0 : 0.0;
      double num2 = obj2.num();

      result = comparator.compareNumbers(num1, num2);
    }
    else if (XObject.CLASS_NUMBER == type)
    {

      // From http://www.w3.org/TR/xpath: 
      // If one object to be compared is a node-set and the other is a number, 
      // then the comparison will be true if and only if there is a 
      // node in the node-set such that the result of performing the 
      // comparison on the number to be compared and on the result of 
      // converting the string-value of that node to a number using 
      // the number function is true. 
      DTMIterator list1 = iterRaw();
      double num2 = obj2.num();
      int node;

      while (DTM.NULL != (node = list1.nextNode()))
      {
        double num1 = getNumberFromNode(node);

        if (comparator.compareNumbers(num1, num2))
        {
          result = true;

          break;
        }
      }
      list1.reset();
    }
    else if (XObject.CLASS_RTREEFRAG == type)
    {
      XMLString s2 = obj2.xstr();
      DTMIterator list1 = iterRaw();
      int node;

      while (DTM.NULL != (node = list1.nextNode()))
      {
        XMLString s1 = getStringFromNode(node);

        if (comparator.compareStrings(s1, s2))
        {
          result = true;

          break;
        }
      }
      list1.reset();
    }
    else if (XObject.CLASS_STRING == type)
    {

      // From http://www.w3.org/TR/xpath: 
      // If one object to be compared is a node-set and the other is a 
      // string, then the comparison will be true if and only if there 
      // is a node in the node-set such that the result of performing 
      // the comparison on the string-value of the node and the other 
      // string is true. 
      XMLString s2 = obj2.xstr();
      DTMIterator list1 = iterRaw();
      int node;

      while (DTM.NULL != (node = list1.nextNode()))
      {
        XMLString s1 = getStringFromNode(node);
        if (comparator.compareStrings(s1, s2))
        {
          result = true;

          break;
        }
      }
      list1.reset();
    }
    else
    {
      result = comparator.compareNumbers(this.num(), obj2.num());
    }

    return result;
  }

  /**
   * Tell if one object is less than the other.
   *
   * @param obj2 object to compare this nodeset to
   *
   * @return see this.compare(...) 
   *
   * @throws javax.xml.transform.TransformerException
   */
  public boolean lessThan(XObject obj2) throws javax.xml.transform.TransformerException
  {
    return compare(obj2, S_LT);
  }

  /**
   * Tell if one object is less than or equal to the other.
   *
   * @param obj2 object to compare this nodeset to
   *
   * @return see this.compare(...) 
   *
   * @throws javax.xml.transform.TransformerException
   */
  public boolean lessThanOrEqual(XObject obj2) throws javax.xml.transform.TransformerException
  {
    return compare(obj2, S_LTE);
  }

  /**
   * Tell if one object is less than the other.
   *
   * @param obj2 object to compare this nodeset to
   *
   * @return see this.compare(...) 
   *
   * @throws javax.xml.transform.TransformerException
   */
  public boolean greaterThan(XObject obj2) throws javax.xml.transform.TransformerException
  {
    return compare(obj2, S_GT);
  }

  /**
   * Tell if one object is less than the other.
   *
   * @param obj2 object to compare this nodeset to
   *
   * @return see this.compare(...) 
   *
   * @throws javax.xml.transform.TransformerException
   */
  public boolean greaterThanOrEqual(XObject obj2)
          throws javax.xml.transform.TransformerException
  {
    return compare(obj2, S_GTE);
  }

  /**
   * Tell if two objects are functionally equal.
   *
   * @param obj2 object to compare this nodeset to
   *
   * @return see this.compare(...) 
   *
   * @throws javax.xml.transform.TransformerException
   */
  public boolean equals(XObject obj2)
  {
    try
    {
      return compare(obj2, S_EQ);
    }
    catch(javax.xml.transform.TransformerException te)
    {
      throw new com.sun.org.apache.xml.internal.utils.WrappedRuntimeException(te);
    }
  }

  /**
   * Tell if two objects are functionally not equal.
   *
   * @param obj2 object to compare this nodeset to
   *
   * @return see this.compare(...) 
   *
   * @throws javax.xml.transform.TransformerException
   */
  public boolean notEquals(XObject obj2) throws javax.xml.transform.TransformerException
  {
    return compare(obj2, S_NEQ);
  }
}

/**
 * compares nodes for various boolean operations.
 */
abstract class Comparator
{

  /**
   * Compare two strings
   *
   *
   * @param s1 First string to compare
   * @param s2 Second String to compare 
   *
   * @return Whether the strings are equal or not
   */
  abstract boolean compareStrings(XMLString s1, XMLString s2);

  /**
   * Compare two numbers
   *
   *
   * @param n1 First number to compare
   * @param n2 Second number to compare
   *
   * @return Whether the numbers are equal or not
   */
  abstract boolean compareNumbers(double n1, double n2);
}

/**
 * Compare strings or numbers for less than.
 */
class LessThanComparator extends Comparator
{

  /**
   * Compare two strings for less than.
   *
   *
   * @param s1 First string to compare
   * @param s2 Second String to compare 
   *
   * @return True if s1 is less than s2
   */
  boolean compareStrings(XMLString s1, XMLString s2)
  {
    return (s1.toDouble() < s2.toDouble());
    // return s1.compareTo(s2) < 0;
  }

  /**
   * Compare two numbers for less than.
   *
   *
   * @param n1 First number to compare
   * @param n2 Second number to compare
   *
   * @return true if n1 is less than n2
   */
  boolean compareNumbers(double n1, double n2)
  {
    return n1 < n2;
  }
}

/**
 * Compare strings or numbers for less than or equal.
 */
class LessThanOrEqualComparator extends Comparator
{

  /**
   * Compare two strings for less than or equal.
   *
   *
   * @param s1 First string to compare
   * @param s2 Second String to compare
   *
   * @return true if s1 is less than or equal to s2
   */
  boolean compareStrings(XMLString s1, XMLString s2)
  {
    return (s1.toDouble() <= s2.toDouble());
    // return s1.compareTo(s2) <= 0;
  }

  /**
   * Compare two numbers for less than or equal.
   *
   *
   * @param n1 First number to compare
   * @param n2 Second number to compare
   *
   * @return true if n1 is less than or equal to n2
   */
  boolean compareNumbers(double n1, double n2)
  {
    return n1 <= n2;
  }
}

/**
 * Compare strings or numbers for greater than.
 */
class GreaterThanComparator extends Comparator
{

  /**
   * Compare two strings for greater than.
   *
   *
   * @param s1 First string to compare
   * @param s2 Second String to compare
   *
   * @return true if s1 is greater than s2
   */
  boolean compareStrings(XMLString s1, XMLString s2)
  {
    return (s1.toDouble() > s2.toDouble());
    // return s1.compareTo(s2) > 0;
  }

  /**
   * Compare two numbers for greater than.
   *
   *
   * @param n1 First number to compare
   * @param n2 Second number to compare
   *
   * @return true if n1 is greater than n2
   */
  boolean compareNumbers(double n1, double n2)
  {
    return n1 > n2;
  }
}

/**
 * Compare strings or numbers for greater than or equal.
 */
class GreaterThanOrEqualComparator extends Comparator
{

  /**
   * Compare two strings for greater than or equal.
   *
   *
   * @param s1 First string to compare
   * @param s2 Second String to compare
   *
   * @return true if s1 is greater than or equal to s2
   */
  boolean compareStrings(XMLString s1, XMLString s2)
  {
    return (s1.toDouble() >= s2.toDouble());
    // return s1.compareTo(s2) >= 0;
  }

  /**
   * Compare two numbers for greater than or equal.
   *
   *
   * @param n1 First number to compare
   * @param n2 Second number to compare
   *
   * @return true if n1 is greater than or equal to n2
   */
  boolean compareNumbers(double n1, double n2)
  {
    return n1 >= n2;
  }
}

/**
 * Compare strings or numbers for equality.
 */
class EqualComparator extends Comparator
{

  /**
   * Compare two strings for equality.
   *
   *
   * @param s1 First string to compare
   * @param s2 Second String to compare
   *
   * @return true if s1 is equal to s2
   */
  boolean compareStrings(XMLString s1, XMLString s2)
  {
    return s1.equals(s2);
  }

  /**
   * Compare two numbers for equality.
   *
   *
   * @param n1 First number to compare
   * @param n2 Second number to compare
   *
   * @return true if n1 is equal to n2
   */
  boolean compareNumbers(double n1, double n2)
  {
    return n1 == n2;
  }
}

/**
 * Compare strings or numbers for non-equality.
 */
class NotEqualComparator extends Comparator
{

  /**
   * Compare two strings for non-equality.
   *
   *
   * @param s1 First string to compare
   * @param s2 Second String to compare
   *
   * @return true if s1 is not equal to s2
   */
  boolean compareStrings(XMLString s1, XMLString s2)
  {
    return !s1.equals(s2);
  }

  /**
   * Compare two numbers for non-equality.
   *
   *
   * @param n1 First number to compare
   * @param n2 Second number to compare
   *
   * @return true if n1 is not equal to n2
   */
  boolean compareNumbers(double n1, double n2)
  {
    return n1 != n2;
  }
}