ASAT2009年5月14日:我已经转向使用混合方法…参见下面的代码。
此版本具有以下两个优点:
*xmlReader/xmlTextReader(内存效率-->速度);以及
*XML序列化程序(代码生成-->开发便利性和灵活性)。
它使用xmltextreader迭代文档,并创建“doclets”,使用xmlserializer和用xsd.exe生成的“xml绑定”类对其进行反序列化。
我想这个食谱是普遍适用的,而且很快…我将在大约7秒钟内解析一个包含56000个GML特性的201MB XML文档…该应用程序的旧vb6实现需要几分钟(甚至数小时)来解析大型提取…所以我很高兴去。
再一次,A
大的
感谢福米特人给你宝贵的时间。我真的很感激。
干杯。基思。
using System;
using System.Reflection;
using System.Xml;
using System.Xml.Serialization;
using System.IO;
using System.Collections.Generic;
using nrw_rime_extract.utils;
using nrw_rime_extract.xml.generated_bindings;
namespace nrw_rime_extract.xml
{
internal interface ExtractXmlReader
{
rimeType read(string xmlFilename);
}
/// <summary>
/// RimeExtractXml provides bindings to the RIME Extract XML as defined by
/// $/Release 2.7/Documentation/Technical/SCHEMA and DTDs/nrw-rime-extract.xsd
/// </summary>
internal class ExtractXmlReader_XmlSerializerImpl : ExtractXmlReader
{
private Log log = Log.getInstance();
public rimeType read(string xmlFilename)
{
log.write(
string.Format(
"DEBUG: ExtractXmlReader_XmlSerializerImpl.read({0})",
xmlFilename));
using (Stream stream = new FileStream(xmlFilename, FileMode.Open))
{
return read(stream);
}
}
internal rimeType read(Stream xmlInputStream)
{
// create an instance of the XmlSerializer class,
// specifying the type of object to be deserialized.
XmlSerializer serializer = new XmlSerializer(typeof(rimeType));
serializer.UnknownNode += new XmlNodeEventHandler(handleUnknownNode);
serializer.UnknownAttribute +=
new XmlAttributeEventHandler(handleUnknownAttribute);
// use the Deserialize method to restore the object's state
// with data from the XML document.
return (rimeType)serializer.Deserialize(xmlInputStream);
}
protected void handleUnknownNode(object sender, XmlNodeEventArgs e)
{
log.write(
string.Format(
"XML_ERROR: Unknown Node at line {0} position {1} : {2}\t{3}",
e.LineNumber, e.LinePosition, e.Name, e.Text));
}
protected void handleUnknownAttribute(object sender, XmlAttributeEventArgs e)
{
log.write(
string.Format(
"XML_ERROR: Unknown Attribute at line {0} position {1} : {2}='{3}'",
e.LineNumber, e.LinePosition, e.Attr.Name, e.Attr.Value));
}
}
/// <summary>
/// xtractXmlReader provides bindings to the extract.xml
/// returned by the RIME server; as defined by:
/// $/Release X/Documentation/Technical/SCHEMA and
/// DTDs/nrw-rime-extract.xsd
/// </summary>
internal class ExtractXmlReader_XmlTextReaderXmlSerializerHybridImpl :
ExtractXmlReader
{
private Log log = Log.getInstance();
public rimeType read(string xmlFilename)
{
log.write(
string.Format(
"DEBUG: ExtractXmlReader_XmlTextReaderXmlSerializerHybridImpl." +
"read({0})",
xmlFilename));
using (XmlReader reader = XmlReader.Create(xmlFilename))
{
return read(reader);
}
}
public rimeType read(XmlReader reader)
{
rimeType result = new rimeType();
// a deserializer for featureClass, feature, etc, "doclets"
Dictionary<Type, XmlSerializer> serializers =
new Dictionary<Type, XmlSerializer>();
serializers.Add(typeof(featureClassType),
newSerializer(typeof(featureClassType)));
serializers.Add(typeof(featureType),
newSerializer(typeof(featureType)));
List<featureClassType> featureClasses = new List<featureClassType>();
List<featureType> features = new List<featureType>();
while (!reader.EOF)
{
if (reader.MoveToContent() != XmlNodeType.Element)
{
reader.Read(); // skip non-element-nodes and unknown-elements.
continue;
}
// skip junk nodes.
if (reader.Name.Equals("featureClass"))
{
using (
StringReader elementReader =
new StringReader(reader.ReadOuterXml()))
{
XmlSerializer deserializer =
serializers[typeof (featureClassType)];
featureClasses.Add(
(featureClassType)
deserializer.Deserialize(elementReader));
}
continue;
// ReadOuterXml advances the reader, so don't read again.
}
if (reader.Name.Equals("feature"))
{
using (
StringReader elementReader =
new StringReader(reader.ReadOuterXml()))
{
XmlSerializer deserializer =
serializers[typeof (featureType)];
features.Add(
(featureType)
deserializer.Deserialize(elementReader));
}
continue;
// ReadOuterXml advances the reader, so don't read again.
}
log.write(
"WARNING: unknown element '" + reader.Name +
"' was skipped during parsing.");
reader.Read(); // skip non-element-nodes and unknown-elements.
}
result.featureClasses = featureClasses.ToArray();
result.features = features.ToArray();
return result;
}
private XmlSerializer newSerializer(Type elementType)
{
XmlSerializer serializer = new XmlSerializer(elementType);
serializer.UnknownNode += new XmlNodeEventHandler(handleUnknownNode);
serializer.UnknownAttribute +=
new XmlAttributeEventHandler(handleUnknownAttribute);
return serializer;
}
protected void handleUnknownNode(object sender, XmlNodeEventArgs e)
{
log.write(
string.Format(
"XML_ERROR: Unknown Node at line {0} position {1} : {2}\t{3}",
e.LineNumber, e.LinePosition, e.Name, e.Text));
}
protected void handleUnknownAttribute(object sender, XmlAttributeEventArgs e)
{
log.write(
string.Format(
"XML_ERROR: Unknown Attribute at line {0} position {1} : {2}='{3}'",
e.LineNumber, e.LinePosition, e.Attr.Name, e.Attr.Value));
}
}
}
