以下のサンプルコードでは、 '// elementName'という形式のXPathは、ソースxmlに名前空間接頭辞下のコード)。xmlに名前空間プレフィックスがある場合、特定のXPath式だけがノードを見つけるのはなぜですか?
ソースxmlに名前空間接頭辞がない場合、リストされたすべてのXPath式がノードを返します(testNoNS()
参照)。
私はNamespaceContext(testWithNSContext()
のように)を設定し、xmlを名前空間認識ドキュメントとして解析し、XPathで名前空間接頭辞を使用することでこれを解決できることは分かっています。しかし、私は実際のコードがネームスペースプレフィックスの有無にかかわらずxmlを処理する必要があるので、これをしたくありません。
それがあるだけで、なぜ私の質問は次のとおりです。
- //テスト
- // child1の
- // grandchild1
- // child2のはまだnullを返し
、 testWithNS()
の他のすべての例はノードを返しますか?
出力
testNoNS()
test = found
/test = found
//test = found
//test/* = found
//test/child1 = found
//test/child1/grandchild1 = found
//test/child2 = found
//child1 = found
//grandchild1 = found
//child1/grandchild1 = found
//child2 = found
testWithNS()
test = found
/test = found
//test = *** NOT FOUND ***
//test/* = found
//test/child1 = found
//test/child1/grandchild1 = found
//test/child2 = found
//child1 = *** NOT FOUND ***
//grandchild1 = *** NOT FOUND ***
//child1/grandchild1 = found
//child2 = *** NOT FOUND ***
testWithNSContext()
ns1:test = found
/ns1:test = found
//ns1:test = found
//ns1:test/* = found
//ns1:test/ns1:child1 = found
//ns1:test/ns1:child1/ns1:grandchild1 = found
//ns1:test/ns1:child2 = found
//ns1:child1 = found
//ns1:grandchild1 = found
//ns1:child1/ns1:grandchild1 = found
//ns1:child2 = found
コード私は今、サクソン人はこの
にXPahtFactoryラインを変更する使用して同じコードをテストしているサクソンテスト以下
import java.io.StringReader;
import java.util.Iterator;
import javax.xml.XMLConstants;
import javax.xml.namespace.NamespaceContext;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathFactory;
import org.junit.Test;
import org.w3c.dom.Document;
import org.xml.sax.InputSource;
public class XPathBugTest {
private String xmlDec = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>";
private String xml = xmlDec +
"<test>" +
" <child1>" +
" <grandchild1/>" +
" </child1>" +
" <child2/>" +
"</test>";
private String xmlNs = xmlDec +
"<ns1:test xmlns:ns1=\"http://www.wfmc.org/2002/XPDL1.0\">" +
" <ns1:child1>" +
" <ns1:grandchild1/>" +
" </ns1:child1>" +
" <ns1:child2/>" +
"</ns1:test>";
final XPathFactory xpathFactory = XPathFactory.newInstance();
final XPath xpath = xpathFactory.newXPath();
@Test
public void testNoNS() throws Exception {
System.out.println("\ntestNoNS()");
final Document doc = getDocument(xml);
isFound("test", xpath.evaluate("test", doc, XPathConstants.NODE));
isFound("/test", xpath.evaluate("/test", doc, XPathConstants.NODE));
isFound("//test", xpath.evaluate("//test", doc, XPathConstants.NODE));
isFound("//test/*", xpath.evaluate("//test/*", doc, XPathConstants.NODE));
isFound("//test/child1", xpath.evaluate("//test/child1", doc, XPathConstants.NODE));
isFound("//test/child1/grandchild1", xpath.evaluate("//test/child1/grandchild1", doc, XPathConstants.NODE));
isFound("//test/child2", xpath.evaluate("//test/child2", doc, XPathConstants.NODE));
isFound("//child1", xpath.evaluate("//child1", doc, XPathConstants.NODE));
isFound("//grandchild1", xpath.evaluate("//grandchild1", doc, XPathConstants.NODE));
isFound("//child1/grandchild1", xpath.evaluate("//child1/grandchild1", doc, XPathConstants.NODE));
isFound("//child2", xpath.evaluate("//child2", doc, XPathConstants.NODE));
}
@Test
public void testWithNS() throws Exception {
System.out.println("\ntestWithNS()");
final Document doc = getDocument(xmlNs);
isFound("test", xpath.evaluate("test", doc, XPathConstants.NODE));
isFound("/test", xpath.evaluate("/test", doc, XPathConstants.NODE));
isFound("//test", xpath.evaluate("//test", doc, XPathConstants.NODE));
isFound("//test/*", xpath.evaluate("//test/*", doc, XPathConstants.NODE));
isFound("//test/child1", xpath.evaluate("//test/child1", doc, XPathConstants.NODE));
isFound("//test/child1/grandchild1", xpath.evaluate("//test/child1/grandchild1", doc, XPathConstants.NODE));
isFound("//test/child2", xpath.evaluate("//test/child2", doc, XPathConstants.NODE));
isFound("//child1", xpath.evaluate("//child1", doc, XPathConstants.NODE));
isFound("//grandchild1", xpath.evaluate("//grandchild1", doc, XPathConstants.NODE));
isFound("//child1/grandchild1", xpath.evaluate("//child1/grandchild1", doc, XPathConstants.NODE));
isFound("//child2", xpath.evaluate("//child2", doc, XPathConstants.NODE));
}
@Test
public void testWithNSContext() throws Exception {
System.out.println("\ntestWithNSContext()");
final Document doc = getDocumentNS(xmlNs);
xpath.setNamespaceContext(new MyNamespaceContext());
isFound("ns1:test", xpath.evaluate("ns1:test", doc, XPathConstants.NODE));
isFound("/ns1:test", xpath.evaluate("/ns1:test", doc, XPathConstants.NODE));
isFound("//ns1:test", xpath.evaluate("//ns1:test", doc, XPathConstants.NODE));
isFound("//ns1:test/*", xpath.evaluate("//ns1:test/*", doc, XPathConstants.NODE));
isFound("//ns1:test/ns1:child1", xpath.evaluate("//ns1:test/ns1:child1", doc, XPathConstants.NODE));
isFound("//ns1:test/ns1:child1/ns1:grandchild1", xpath.evaluate("//ns1:test/ns1:child1/ns1:grandchild1", doc, XPathConstants.NODE));
isFound("//ns1:test/ns1:child2", xpath.evaluate("//ns1:test/ns1:child2", doc, XPathConstants.NODE));
isFound("//ns1:child1", xpath.evaluate("//ns1:child1", doc, XPathConstants.NODE));
isFound("//ns1:grandchild1", xpath.evaluate("//ns1:grandchild1", doc, XPathConstants.NODE));
isFound("//ns1:child1/ns1:grandchild1", xpath.evaluate("//ns1:child1/ns1:grandchild1", doc, XPathConstants.NODE));
isFound("//ns1:child2", xpath.evaluate("//ns1:child2", doc, XPathConstants.NODE));
}
private void isFound(String xpath, Object object) {
System.out.println(xpath + " = " + (object == null ? "*** NOT FOUND ***" : "found"));
}
private Document getDocument(final String xml) throws Exception {
final DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
return factory.newDocumentBuilder().parse(new InputSource(new StringReader(xml)));
}
private Document getDocumentNS(final String xml) throws Exception {
final DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setNamespaceAware(true);
return factory.newDocumentBuilder().parse(new InputSource(new StringReader(xml)));
}
public class MyNamespaceContext implements NamespaceContext {
@Override
public String getNamespaceURI(String prefix) {
if ("ns1".equals(prefix)) {
return "http://www.wfmc.org/2002/XPDL1.0";
}
return XMLConstants.NULL_NS_URI;
}
@Override
public String getPrefix(String uri) {
throw new UnsupportedOperationException();
}
@Override
public Iterator getPrefixes(String uri) {
throw new UnsupportedOperationException();
}
}
}
更新サクソンにtestWithNS()
リターン*** NOT FOUND ***
ではなく、デフォルトのXalanの実装と同様に「// がelementName」のようなものだけですべての行を使用してfinal XPathFactory xpathFactory = new net.sf.saxon.xpath.XPathFactoryImpl();
final XPathFactory xpathFactory = new net.sf.saxon.xpath.XPathFactoryImpl();
。
xmlを解析するためにネームスペースを認識しないドキュメントビルダーファクトリを使用していることを考えれば、なぜこれらのxpathは機能しないのですか?
XPath実装のバグのようです。 – obecker
私はそれを疑問に思っていましたが、それは誰かにとって明らかなことかもしれません。私はサクソンと上記を試し、何が起こるかを報告します。 –