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UnionPattern.javaAPI DocJava SE 5 API5280Fri Aug 26 14:56:10 BST 2005com.sun.org.apache.xpath.internal.patterns

UnionPattern

public class UnionPattern extends Expression
This class represents a union pattern, which can have multiple individual StepPattern patterns.
xsl.usage
advanced

Fields Summary
private StepPattern[]
m_patterns
Array of the contained step patterns to be tested.
Constructors Summary
Methods Summary
public voidcallVisitors(com.sun.org.apache.xpath.internal.ExpressionOwner owner, com.sun.org.apache.xpath.internal.XPathVisitor visitor)

see
XPathVisitable#callVisitors(ExpressionOwner, XPathVisitor)

  	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);
  		}
  	}
public booleancanTraverseOutsideSubtree()
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.

     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;
public booleandeepEquals(com.sun.org.apache.xpath.internal.Expression expr)

see
Expression#deepEquals(Expression)

  	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;
public com.sun.org.apache.xpath.internal.objects.XObjectexecute(com.sun.org.apache.xpath.internal.XPathContext xctxt)
Test a node to see if it matches any of the patterns in the union.

param
xctxt XPath runtime context.
return
{@link com.sun.org.apache.xpath.internal.patterns.NodeTest#SCORE_NODETEST}, {@link com.sun.org.apache.xpath.internal.patterns.NodeTest#SCORE_NONE}, {@link com.sun.org.apache.xpath.internal.patterns.NodeTest#SCORE_NSWILD}, {@link com.sun.org.apache.xpath.internal.patterns.NodeTest#SCORE_QNAME}, or {@link com.sun.org.apache.xpath.internal.patterns.NodeTest#SCORE_OTHER}.
throws
javax.xml.transform.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;
public voidfixupVariables(java.util.Vector vars, int globalsSize)
No arguments to process, so this does nothing.

    for (int i = 0; i < m_patterns.length; i++) 
    {
      m_patterns[i].fixupVariables(vars, globalsSize);
    }
public com.sun.org.apache.xpath.internal.patterns.StepPattern[]getPatterns()
Get the contained step patterns to be tested.

return
an array of the contained step patterns to be tested.

    return m_patterns;
public voidsetPatterns(com.sun.org.apache.xpath.internal.patterns.StepPattern[] patterns)
Set the contained step patterns to be tested.

param
patterns the contained step patterns to be tested.

    m_patterns = patterns;
    if(null != patterns)
    {
    	for(int i = 0; i < patterns.length; i++)
    	{
    		patterns[i].exprSetParent(this);
    	}
    }