java - 重用 xalan 转换器导致其扩展功能中断

Question

我正在使用 xalan 2.7.1 通过 xslt 样式表验证我的 xml 文档。它适用于第一个文档，并在出现错误时返回错误消息以及 xml 源的正确行号和列号，方法是使用 NodeInfo.lineNumber 和 NodeInfo.columnNumber 扩展。

问题是当我尝试重用转换器来验证其他 xml 文档时，它成功地转换了文档，但对于所有错误总是返回 lineNumber=columnNumber=-1。
有什么想法吗？

编辑:这是我的代码:

package mycompany;

import java.io.File;
import javax.xml.transform.ErrorListener;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;
import org.apache.xalan.processor.TransformerFactoryImpl;

public class XsltTransformer {

    public static void main(String[] args) {

        TransformerFactory tFactory = TransformerFactory.newInstance();
        tFactory.setAttribute(TransformerFactoryImpl.FEATURE_SOURCE_LOCATION, Boolean.TRUE);

        StreamSource xsltStreamSource = new StreamSource(new File("E:\\Temp\\Test\\myXslt.xsl"));
        try {
            Transformer transformer = tFactory.newTransformer(xsltStreamSource);

            File srcFolder = new File("E:\\Temp\\Test");
            for (File file : srcFolder.listFiles()) {
                if (file.getName().endsWith("xml")) {

                    Source source = new StreamSource(file);
                    StreamResult result = new StreamResult(System.out);

                    XsltTransformer xsltTransformer = new XsltTransformer();
                    ErrorListenerImpl errorHandler = xsltTransformer.new ErrorListenerImpl();
                    transformer.setErrorListener(errorHandler);

                    transformer.transform(source, result);

                    if (errorHandler.e != null) {
                        System.out.println("Transformation Exception: " + errorHandler.e.getMessage());
                    }

                    transformer.reset();
                }
            }

        } catch (TransformerException e) {
            e.printStackTrace();
        }
    }

    private class ErrorListenerImpl implements ErrorListener {
        public TransformerException e = null;

        public void error(TransformerException exception) {
            this.e = exception;
        }

        public void fatalError(TransformerException exception) {
            this.e = exception;
        }

        public void warning(TransformerException exception) {
            this.e = exception;
        }
    }
}

编辑:这是 myXslt.xsl 和 XML 源:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<axsl:stylesheet 
    xmlns:axsl="http://www.w3.org/1999/XSL/Transform" 
    xmlns:iso="http://purl.oclc.org/dsdl/schematron" 
    xmlns:sch="http://www.ascc.net/xml/schematron"
    version="1.0" 
    xmlns:nodeinfo="xalan://org.apache.xalan.lib.NodeInfo">

  <axsl:output 
      xmlns:svrl="http://purl.oclc.org/dsdl/svrl" 
      xmlns:schold="http://www.ascc.net/xml/schematron" 
      xmlns:xs="http://www.w3.org/2001/XMLSchema"
      indent="yes" 
      standalone="yes" 
      omit-xml-declaration="no" 
      method="xml" />

  <!--SCHEMA METADATA -->
  <axsl:template match="/">
    <svrl:schematron-output xmlns:svrl="http://purl.oclc.org/dsdl/svrl" xmlns:schold="http://www.ascc.net/xml/schematron" 
                            xmlns:xs="http://www.w3.org/2001/XMLSchema" schemaVersion="ISO19757-3" title="Test ISO schematron file. Introduction mode ">
      <svrl:active-pattern>
        <axsl:apply-templates />
      </svrl:active-pattern>
      <axsl:apply-templates mode="M1" select="/" />
    </svrl:schematron-output>
  </axsl:template>

  <!--RULE -->
  <axsl:template mode="M1" priority="1000" match="//*[@remote-property]">
    <svrl:fired-rule xmlns:svrl="http://purl.oclc.org/dsdl/svrl" xmlns:schold="http://www.ascc.net/xml/schematron" 
                     xmlns:xs="http://www.w3.org/2001/XMLSchema" context="//*[@remote-property]" />

    <!--ASSERT -->
    <axsl:choose>
      <axsl:when test="@remote-property = //@id or @remote-property = //@name" />
      <axsl:otherwise>
        <svrl:failed-assert xmlns:svrl="http://purl.oclc.org/dsdl/svrl" xmlns:schold="http://www.ascc.net/xml/schematron" 
                            xmlns:xs="http://www.w3.org/2001/XMLSchema" test="@remote-property = //@id or @remote-property = //@name">
          <axsl:attribute name="lineNumber">
              <axsl:value-of select="nodeinfo:lineNumber()" />
          </axsl:attribute>
          <axsl:attribute name="columnNumber">
              <axsl:value-of select="nodeinfo:columnNumber()" />
          </axsl:attribute>
          <svrl:text>
            Invalid remote-property: remote class element with this id or name does not exists
      </svrl:text>
        </svrl:failed-assert>
      </axsl:otherwise>
    </axsl:choose>
  </axsl:template>
</axsl:stylesheet>

source1.xml:

<?xml version="1.0" encoding="UTF-8"?>
<root>
    <remote-service>
        <class name="Table1" table="table1">
            <id name="col1"/>
            <property name="col2"/>
        </class>
    </remote-service>
    <application>
        <text-field name="field1" remote-property="col1X"/>
    </application>
</root> 

和source2.xml

<?xml version="1.0" encoding="UTF-8"?>
<root>
    <application>
        <text-field name="field1" remote-property="col1Z"/>
    </application>
</root> 

Answer 1

javadoc状态:

The reset Transformer is not guaranteed to have the same URIResolver or ErrorListener Objects

您可能必须将 ErrorListener 引用重置为重置转换器的新 ErrorListener。

更新

我没有使用 schematron 库的经验，据我所知，这可能是重置转换器使用该库的问题。

如果你不能让它工作重置转换器，你可以使用 XSL 模板工具来避免在每个转换上解释 XSL 表:

import javax.xml.transform.TransformerFactory;
import javax.xml.transform.Templates;
import javax.xml.transform.Transformer;

TransformerFactory factory = TransformerFactory.newInstance();

Templates xslTemplate = factory.newTemplates(new StreamSource(new StringReader(xsl)));

稍后通过从中获取转换器来重新使用模板:

Transformer transformer = xslTemplate.newTransformer();