| using System; |
| using System.Globalization; |
| using System.IO; |
| using System.Text; |
| using System.Xml; |
| |
| namespace Lucene.Net.QueryParsers.Xml |
| { |
| /* |
| * 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. |
| */ |
| |
| /// <summary> |
| /// Helper methods for parsing XML |
| /// </summary> |
| public class DOMUtils |
| { |
| public static XmlElement GetChildByTagOrFail(XmlElement e, string name) |
| { |
| XmlElement kid = GetChildByTagName(e, name); |
| if (null == kid) |
| { |
| throw new ParserException(e.ToString() + " missing \"" + name |
| + "\" child element"); |
| } |
| return kid; |
| } |
| |
| public static XmlElement GetFirstChildOrFail(XmlElement e) |
| { |
| XmlElement kid = GetFirstChildElement(e); |
| if (null == kid) |
| { |
| throw new ParserException(e.ToString() |
| + " does not contain a child element"); |
| } |
| return kid; |
| } |
| |
| public static string GetAttributeOrFail(XmlElement e, string name) |
| { |
| string v = e.GetAttribute(name); |
| if (null == v) |
| { |
| throw new ParserException(e.ToString() + " missing \"" + name |
| + "\" attribute"); |
| } |
| return v; |
| } |
| |
| public static string GetAttributeWithInheritanceOrFail(XmlElement e, string name) |
| { |
| string v = GetAttributeWithInheritance(e, name); |
| if (null == v) |
| { |
| throw new ParserException(e.ToString() + " missing \"" + name |
| + "\" attribute"); |
| } |
| return v; |
| } |
| |
| public static string GetNonBlankTextOrFail(XmlElement e) |
| { |
| string v = GetText(e); |
| if (null != v) |
| v = v.Trim(); |
| if (null == v || 0 == v.Length) |
| { |
| throw new ParserException(e.ToString() + " has no text"); |
| } |
| return v; |
| } |
| |
| /// <summary>Convenience method where there is only one child <see cref="XmlElement"/> of a given name</summary> |
| public static XmlElement GetChildByTagName(XmlElement e, string name) |
| { |
| for (XmlNode kid = e.FirstChild; kid != null; kid = kid.NextSibling) |
| { |
| if ((kid.NodeType == XmlNodeType.Element) && (name.Equals(kid.Name, StringComparison.Ordinal))) |
| { |
| return (XmlElement)kid; |
| } |
| } |
| return null; |
| } |
| |
| /// <summary> |
| /// Returns an attribute value from this node, or first parent node with this attribute defined |
| /// </summary> |
| /// <param name="element"></param> |
| /// <param name="attributeName"></param> |
| /// <returns>A non-zero-length value if defined, otherwise null</returns> |
| public static string GetAttributeWithInheritance(XmlElement element, string attributeName) |
| { |
| string result = element.GetAttribute(attributeName); |
| if ((result == null) || ("".Equals(result, StringComparison.Ordinal))) |
| { |
| XmlNode n = element.ParentNode; |
| if ((n == element) || (n == null)) |
| { |
| return null; |
| } |
| if (n is XmlElement) |
| { |
| XmlElement parent = (XmlElement)n; |
| return GetAttributeWithInheritance(parent, attributeName); |
| } |
| return null; //we reached the top level of the document without finding attribute |
| } |
| return result; |
| } |
| |
| |
| /// <summary>Convenience method where there is only one child <see cref="XmlElement"/> of a given name</summary> |
| public static string GetChildTextByTagName(XmlElement e, string tagName) |
| { |
| XmlElement child = GetChildByTagName(e, tagName); |
| return child != null ? GetText(child) : null; |
| } |
| |
| /// <summary>Convenience method to append a new child with text</summary> |
| public static XmlElement InsertChild(XmlElement parent, string tagName, string text) |
| { |
| XmlElement child = parent.OwnerDocument.CreateElement(tagName); |
| parent.AppendChild(child); |
| if (text != null) |
| { |
| child.AppendChild(child.OwnerDocument.CreateTextNode(text)); |
| } |
| return child; |
| } |
| |
| public static string GetAttribute(XmlElement element, string attributeName, string deflt) |
| { |
| string result = element.GetAttribute(attributeName); |
| return (result == null) || ("".Equals(result, StringComparison.Ordinal)) ? deflt : result; |
| } |
| |
| public static float GetAttribute(XmlElement element, string attributeName, float deflt) |
| { |
| string result = element.GetAttribute(attributeName); |
| return (result == null) || ("".Equals(result, StringComparison.Ordinal)) ? deflt : Convert.ToSingle(result, CultureInfo.InvariantCulture); |
| } |
| |
| public static int GetAttribute(XmlElement element, string attributeName, int deflt) |
| { |
| string result = element.GetAttribute(attributeName); |
| return (result == null) || ("".Equals(result, StringComparison.Ordinal)) ? deflt : Convert.ToInt32(result, CultureInfo.InvariantCulture); |
| } |
| |
| public static bool GetAttribute(XmlElement element, string attributeName, |
| bool deflt) |
| { |
| string result = element.GetAttribute(attributeName); |
| return (result == null) || ("".Equals(result, StringComparison.Ordinal)) ? deflt : Convert.ToBoolean(result, CultureInfo.InvariantCulture); |
| } |
| |
| /* Returns text of node and all child nodes - without markup */ |
| //MH changed to Node from Element 25/11/2005 |
| |
| public static string GetText(XmlNode e) |
| { |
| StringBuilder sb = new StringBuilder(); |
| GetTextBuffer(e, sb); |
| return sb.ToString(); |
| } |
| |
| public static XmlElement GetFirstChildElement(XmlElement element) |
| { |
| for (XmlNode kid = element.FirstChild; kid != null; kid = kid.NextSibling) |
| { |
| if (kid.NodeType == XmlNodeType.Element) |
| { |
| return (XmlElement)kid; |
| } |
| } |
| return null; |
| } |
| |
| private static void GetTextBuffer(XmlNode e, StringBuilder sb) |
| { |
| for (XmlNode kid = e.FirstChild; kid != null; kid = kid.NextSibling) |
| { |
| switch (kid.NodeType) |
| { |
| case XmlNodeType.Text: |
| { |
| sb.Append(kid.Value); |
| break; |
| } |
| case XmlNodeType.Element: |
| { |
| GetTextBuffer(kid, sb); |
| break; |
| } |
| case XmlNodeType.EntityReference: |
| { |
| GetTextBuffer(kid, sb); |
| break; |
| } |
| } |
| } |
| } |
| |
| /// <summary> |
| /// Helper method to parse an XML file into a DOM tree, given a <see cref="TextReader"/>. |
| /// </summary> |
| /// <param name="input">reader of the XML file to be parsed</param> |
| /// <returns>an <see cref="XmlDocument"/> object</returns> |
| public static XmlDocument LoadXML(TextReader input) |
| { |
| XmlDocument result = new XmlDocument(); |
| try |
| { |
| result.Load(input); |
| } |
| catch (Exception se) |
| { |
| throw new Exception("Error parsing file:" + se, se); |
| } |
| return result; |
| } |
| |
| /// <summary> |
| /// Helper method to parse an XML file into a DOM tree, given a <see cref="Stream"/>. |
| /// </summary> |
| /// <param name="input">reader of the XML file to be parsed</param> |
| /// <returns>an <see cref="XmlDocument"/> object</returns> |
| // LUCENENET specific |
| public static XmlDocument LoadXML(Stream input) |
| { |
| XmlDocument result = new XmlDocument(); |
| try |
| { |
| result.Load(input); |
| } |
| catch (Exception se) |
| { |
| throw new Exception("Error parsing file:" + se, se); |
| } |
| return result; |
| } |
| |
| /// <summary> |
| /// Helper method to parse an XML file into a DOM tree, given an <see cref="XmlReader"/>. |
| /// </summary> |
| /// <param name="input">reader of the XML file to be parsed</param> |
| /// <returns>an <see cref="XmlDocument"/> object</returns> |
| // LUCENENET specific |
| public static XmlDocument LoadXML(XmlReader input) |
| { |
| XmlDocument result = new XmlDocument(); |
| try |
| { |
| result.Load(input); |
| } |
| catch (Exception se) |
| { |
| throw new Exception("Error parsing file:" + se, se); |
| } |
| return result; |
| } |
| } |
| } |