how to detect two or more roots in xml

[mike]

Hi,

I will have files like:

<get>
<filter>
<configure xmlns="urn:nokia.com:sros:ns:yang:sr:conf">
<system>
<security>
<user-params>
<local-user>
<user>
<user-name /> <!-- selection node in context A -->
</user>
</local-user>
</user-params>
</security>
</system>
</configure>
<state xmlns="urn:nokia.com:sros:ns:yang:sr:state">
<system>
<security>
<user-params>
<local-user>
<user>
<attempted-logins /> <!-- selection node in context B -->
</user>
</local-user>
</user-params>
</security>
</system>
</state>
</filter>
</get>

I will need to parse to xml:

<configure xmlns="urn:nokia.com:sros:ns:yang:sr:conf">
<system>
<security>
<user-params>
<local-user>
<user>
<user-name /> <!-- selection node in context A -->
</user>
</local-user>
</user-params>
</security>
</system>
</configure>
<state xmlns="urn:nokia.com:sros:ns:yang:sr:state">
<system>
<security>
<user-params>
<local-user>
<user>
<attempted-logins /> <!-- selection node in context B -->
</user>
</local-user>
</user-params>
</security>
</system>
</state>

However it is not valid xml since it is two roots. How can I detect that I have two roots. Currently I am only seeing this when parse fails ( see below) And message is too general to know there are multiple ( in this case 2) roots.
If I can detect multi roots I can split string and parse each and add them together later ( I think).

Any ideas?
br,

//mike


<subtreeA></subtreeA><subtreeB ></subtreeB>
at com.ericsson.commonlibrary.netconf.AbstractNetconfBase.parseXmlString(AbstractNetconfBase.java:409)
at com.ericsson.commonlibrary.netconf.AbstractNetconfBase.get(AbstractNetconfBase.java:728)
at com.ericsson.commonlibrary.netconf.NetconfTest.testGet(NetconfTest.java:156)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:124)
at org.testng.internal.Invoker.invokeMethod(Invoker.java:596)
at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:732)
at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1006)
at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:125)
at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:109)
at org.testng.TestRunner.privateRun(TestRunner.java:651)
at org.testng.TestRunner.run(TestRunner.java:508)
at org.testng.SuiteRunner.runTest(SuiteRunner.java:458)
at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:453)
at org.testng.SuiteRunner.privateRun(SuiteRunner.java:418)
at org.testng.SuiteRunner.run(SuiteRunner.java:367)
at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:84)
at org.testng.TestNG.runSuitesSequentially(TestNG.java:1213)
at org.testng.TestNG.runSuitesLocally(TestNG.java:1142)
at org.testng.TestNG.runSuites(TestNG.java:1050)
at org.testng.TestNG.run(TestNG.java:1018)
at org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:115)
at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:251)
at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:77)
Caused by: org.apache.xmlbeans.XmlException: error: The markup in the document following the root element must be well-formed.
at org.apache.xmlbeans.impl.store.Locale$SaxLoader.load(Locale.java:3448)
at org.apache.xmlbeans.impl.store.Locale.parse(Locale.java:708)
at org.apache.xmlbeans.impl.store.Locale.parseToXmlObject(Locale.java:692)
at org.apache.xmlbeans.impl.store.Locale.parseToXmlObject(Locale.java:679)
at org.apache.xmlbeans.impl.schema.SchemaTypeLoaderBase.parse(SchemaTypeLoaderBase.java:208)
at org.apache.xmlbeans.XmlObject$Factory.parse(XmlObject.java:639)
at com.ericsson.commonlibrary.netconf.AbstractNetconfBase.parseXmlString(AbstractNetconfBase.java:407)
... 27 more
Caused by: org.xml.sax.SAXParseException; systemId: file://; lineNumber: 1; columnNumber: 23; The markup in the document following the root element must be well-formed.
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:203)
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(ErrorHandlerWrapper.java:177)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:400)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:327)
at com.sun.org.apache.xerces.internal.impl.XMLScanner.reportFatalError(XMLScanner.java:1472)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$TrailingMiscDriver.next(XMLDocumentScannerImpl.java:1395)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:602)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:112)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:505)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:842)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:771)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1213)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:643)
at org.apache.xmlbeans.impl.store.Locale$SaxLoader.load(Locale.java:3422)
... 33 more

[Arne Vajhøj]

On 2/23/2021 12:22 PM, mike wrote:
> I will have files like:

> I will need to parse to xml:

> However it is not valid xml since it is two roots. How can I detect
> that I have two roots. Currently I am only seeing this when parse
> fails ( see below) And message is too general to know there are
> multiple ( in this case 2) roots. If I can detect multi roots I can
> split string and parse each and add them together later ( I think).

Parsing and catching is probably the most safe approach.

If you want a string hack then regex may be the easiest approach.

For inspiration:

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class XmlSniffer {
private static Pattern either =
Pattern.compile("(\\<[\\w-]+.*?\\>)|(\\</[\\w-]+\\>)");
private static Pattern start = Pattern.compile("\\<[\\w-]+.*?\\>");
private static Pattern end = Pattern.compile("\\</[\\w-]+\\>");
private static Pattern both = Pattern.compile("\\<[\\w-]+.*?/\\>");
public static boolean check(String xmlstr) {
Matcher e = either.matcher(xmlstr);
int depth = 0;
boolean first = true;
while(e.find()) {
String piece = e.group();
if(start.matcher(piece).matches()) {
if(depth == 0) {
if(first) {
first = false;
} else {
return false;
}
}
if(!both.matcher(piece).matches()) {
depth++;
}
} else if(end.matcher(piece).matches()) {
depth--;
}
}
return true;
}
private static void test(String xmlstr) {
System.out.println(xmlstr);
System.out.println(check(xmlstr));
}
public static void main(String[] args) {
test("<a/>");
test("<a>xxxx</a>");
test("<a>\r\n <b>xxxx</b>\r\n</a>");
test("<a>\r\n <b/>\r\n</a>");
test("<a>xxxx</a>\r\n<c>yyyy</c>");
test("<a>\r\n <b>xxxx</b>\r\n</a>\r\n<c>yyyy</c>");
test("<a>\r\n <b/>\r\n</a>\r\n<c>yyyy</c>");
test("<a>xxxx</a>\r\n<c/>");
test("<a>\r\n <b>xxxx</b>\r\n</a>\r\n<c/>");
test("<a>\r\n <b/>\r\n</a>\r\n<c/>");
test("<a/>\r\n<c/>");
}
}


Arne

[mike]

Thanks Arne! This gave me a concreate heads-on start. I will continue working on this.

br,

//mike

[Daniele Futtorovic]

This looks like a self-inflicted problem. Don't do string manipulations
with XML.

The first document you posted (starting with a "get" element) is
correct. Parse _that_ document. Then extract the children you need --
for instance using XPath. Or build it as a Document and find the
children you need.

(Apologies, early reply was sent directly to OP instead of newsgroup)

--
DF.