- /*
- * The Apache Software License, Version 1.1
- *
- *
- * Copyright (c) 1999 The Apache Software Foundation. All rights
- * reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. The end-user documentation included with the redistribution,
- * if any, must include the following acknowledgment:
- * "This product includes software developed by the
- * Apache Software Foundation (http://www.apache.org/)."
- * Alternately, this acknowledgment may appear in the software itself,
- * if and wherever such third-party acknowledgments normally appear.
- *
- * 4. The names "Xalan" and "Apache Software Foundation" must
- * not be used to endorse or promote products derived from this
- * software without prior written permission. For written
- * permission, please contact apache@apache.org.
- *
- * 5. Products derived from this software may not be called "Apache",
- * nor may "Apache" appear in their name, without prior written
- * permission of the Apache Software Foundation.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- * ====================================================================
- *
- * This software consists of voluntary contributions made by many
- * individuals on behalf of the Apache Software Foundation and was
- * originally based on software copyright (c) 1999, Lotus
- * Development Corporation., http://www.lotus.com. For more
- * information on the Apache Software Foundation, please see
- * <http://www.apache.org/>.
- */
- package org.apache.xalan.lib;
-
- import org.w3c.dom.Node;
- import org.w3c.dom.NodeList;
- import org.apache.xml.dtm.ref.DTMNodeProxy;
-
- /**
- * 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;
- }
- }