- /*
- * Copyright 1999-2004 The Apache Software Foundation.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
- /*
- * $Id: ExsltBase.java,v 1.5 2004/02/11 17:56:36 minchau 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;
- }
- }