| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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. |
| */ |
| /* |
| * $Id$ |
| */ |
| package org.apache.xalan.lib; |
| |
| import org.apache.xml.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; |
| } |
| } |