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Java API for XML Processing Reference Implementation
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/*
* $Id: ExsltBase.java,v 1.9 2010-11-01 04:34:11 joehw Exp $
*/
package com.sun.org.apache.xalan.internal.lib;
import com.sun.org.apache.xml.internal.dtm.ref.DTMNodeProxy;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
/**
* The base class for some EXSLT extension classes.
* It contains common utility methods to be used by the sub-classes.
*/
public abstract class ExsltBase
{
/**
* Return the string value of a Node
*
* @param n The Node.
* @return The string value of the Node
*/
protected static String toString(Node n)
{
if (n instanceof DTMNodeProxy)
return ((DTMNodeProxy)n).getStringValue();
else
{
String value = n.getNodeValue();
if (value == null)
{
NodeList nodelist = n.getChildNodes();
StringBuffer buf = new StringBuffer();
for (int i = 0; i < nodelist.getLength(); i++)
{
Node childNode = nodelist.item(i);
buf.append(toString(childNode));
}
return buf.toString();
}
else
return value;
}
}
/**
* Convert the string value of a Node to a number.
* Return NaN if the string is not a valid number.
*
* @param n The Node.
* @return The number value of the Node
*/
protected static double toNumber(Node n)
{
double d = 0.0;
String str = toString(n);
try
{
d = Double.valueOf(str).doubleValue();
}
catch (NumberFormatException e)
{
d= Double.NaN;
}
return d;
}
}