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/*
* $Id: UnionPattern.java,v 1.8 2010-11-01 04:35:20 joehw Exp $
*/
package com.sun.org.apache.xpath.internal.patterns;
import com.sun.org.apache.xpath.internal.Expression;
import com.sun.org.apache.xpath.internal.ExpressionOwner;
import com.sun.org.apache.xpath.internal.XPathContext;
import com.sun.org.apache.xpath.internal.XPathVisitor;
import com.sun.org.apache.xpath.internal.objects.XObject;
/**
* 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 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
*/
public XObject execute(XPathContext xctxt) 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;
}
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 com.sun.org.apache.xpath.internal.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;
}
}