ohair | 6c32066 | 2012-03-04 11:55:34 -0800 | [diff] [blame^] | 1 | /* |
| 2 | * reserved comment block |
| 3 | * DO NOT REMOVE OR ALTER! |
| 4 | */ |
| 5 | /* |
| 6 | * Copyright 1999-2004 The Apache Software Foundation. |
| 7 | * |
| 8 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 9 | * you may not use this file except in compliance with the License. |
| 10 | * You may obtain a copy of the License at |
| 11 | * |
| 12 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 13 | * |
| 14 | * Unless required by applicable law or agreed to in writing, software |
| 15 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 16 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 17 | * See the License for the specific language governing permissions and |
| 18 | * limitations under the License. |
| 19 | */ |
| 20 | /* |
| 21 | * $Id: ExsltBase.java,v 1.1.2.1 2005/08/01 02:08:51 jeffsuttor Exp $ |
| 22 | */ |
| 23 | package com.sun.org.apache.xalan.internal.lib; |
| 24 | |
| 25 | import com.sun.org.apache.xml.internal.dtm.ref.DTMNodeProxy; |
| 26 | |
| 27 | import org.w3c.dom.Node; |
| 28 | import org.w3c.dom.NodeList; |
| 29 | |
| 30 | /** |
| 31 | * The base class for some EXSLT extension classes. |
| 32 | * It contains common utility methods to be used by the sub-classes. |
| 33 | */ |
| 34 | public abstract class ExsltBase |
| 35 | { |
| 36 | /** |
| 37 | * Return the string value of a Node |
| 38 | * |
| 39 | * @param n The Node. |
| 40 | * @return The string value of the Node |
| 41 | */ |
| 42 | protected static String toString(Node n) |
| 43 | { |
| 44 | if (n instanceof DTMNodeProxy) |
| 45 | return ((DTMNodeProxy)n).getStringValue(); |
| 46 | else |
| 47 | { |
| 48 | String value = n.getNodeValue(); |
| 49 | if (value == null) |
| 50 | { |
| 51 | NodeList nodelist = n.getChildNodes(); |
| 52 | StringBuffer buf = new StringBuffer(); |
| 53 | for (int i = 0; i < nodelist.getLength(); i++) |
| 54 | { |
| 55 | Node childNode = nodelist.item(i); |
| 56 | buf.append(toString(childNode)); |
| 57 | } |
| 58 | return buf.toString(); |
| 59 | } |
| 60 | else |
| 61 | return value; |
| 62 | } |
| 63 | } |
| 64 | |
| 65 | /** |
| 66 | * Convert the string value of a Node to a number. |
| 67 | * Return NaN if the string is not a valid number. |
| 68 | * |
| 69 | * @param n The Node. |
| 70 | * @return The number value of the Node |
| 71 | */ |
| 72 | protected static double toNumber(Node n) |
| 73 | { |
| 74 | double d = 0.0; |
| 75 | String str = toString(n); |
| 76 | try |
| 77 | { |
| 78 | d = Double.valueOf(str).doubleValue(); |
| 79 | } |
| 80 | catch (NumberFormatException e) |
| 81 | { |
| 82 | d= Double.NaN; |
| 83 | } |
| 84 | return d; |
| 85 | } |
| 86 | } |