How to add prefix to each element of XML

Question

how can I add prefix to each element of my XML.

So in general from XML like this:

<CLASSXml>
    <CalculationIndex>
        <RunDesc>NormalCalc</RunDesc>
    </CalculationIndex>
    <GlobalData>
        <CalcIdent>
            <CalcUId>CLASS:20160105:09411486:000007773000:203:CS:CZK:349074</CalcUId>
            <CalcNo>2454307119</CalcNo>
            <CustomNo>349074</CustomNo>
            <CalcVer>2300</CalcVer>
            <XMLVer>23.00.01</XMLVer>
            <Detail>
                <Current>1123</Current>
                <Last>1152</Last>
            </Detail>
            <ClassBuild>23.00.04.03</ClassBuild>
            <SAXIFVersion>6.2</SAXIFVersion>
            <SystemDat>2016-01-05</SystemDat>
            <TimeStamp>09:41:14.86</TimeStamp>
            <ProdMasterVer>0</ProdMasterVer>
        </CalcIdent>
    </GlobalData>
</CLASSXml>

Make something like this:

<ns2:CLASSXml>
    <ns2:CalculationIndex>
        <ns2:RunDesc>NormalCalc</ns2:RunDesc>
    </ns2:CalculationIndex>
    <ns2:GlobalData>
        <ns2:CalcIdent>
            <ns2:CalcUId>CLASS:20160105:09411486:000007773000:203:CS:CZK:349074</ns2:CalcUId>
            <ns2:CalcNo>2454307119</ns2:CalcNo>
            <ns2:CustomNo>349074</ns2:CustomNo>
            <ns2:CalcVer>2300</ns2:CalcVer>
            <ns2:XMLVer>23.00.01</ns2:XMLVer>
            <ns2:Detail>
                <ns2:Current>1123</ns2:Current>
                <ns2:Last>1152</ns2:Last>
            </ns2:detail>
            <ns2:ClassBuild>23.00.04.03</ns2:ClassBuild>
            <ns2:SAXIFVersion>6.2</ns2:SAXIFVersion>
            <ns2:SystemDat>2016-01-05</ns2:SystemDat>
            <ns2:TimeStamp>09:41:14.86</ns2:TimeStamp>
            <ns2:ProdMasterVer>0</ns2:ProdMasterVer>
        </ns2:CalcIdent>
    </ns2:GlobalData>
</ns2:CLASSXml>

I understand there is possible to do something like this with str_replace (as example below) but it is just heavy messy code which is useless if XML become 500 lines long or something similar.

Any ideas how can I do this simple?

public function addNameSpace($xml) {
    $xml = str_replace('<CLASSXml>', '<ns2:CLASSXml>', $xml);
    $xml = str_replace('</CLASSXml>', '</ns2:CLASSXml>', $xml);
    $xml = str_replace('<CalculationIndex>', '<ns2:CalculationIndex>', $xml);
    $xml = str_replace('</CalculationIndex>', '</ns2:CalculationIndex>', $xml);

    // What to do?
}

Answer 1

Using regex in PHP, It will be very easy

$xmlString = preg_replace( '/(?<=\<)([^\/].*?)(?=\>)/', 'ns2:$1', $xmlString); // for <test>
$xmlString = preg_replace( '/(?<=\<\/)(.*?)(?=\>)/', 'ns2:$1', $xmlString); // for </test>

Where $xmlString is your xml content.

Your function

public function addNameSpace($xml)
{
    $xml = preg_replace( '/(?<=\<)([^\/].*?)(?=\>)/', 'ns2:$1', $xml );
    $xml = preg_replace( '/(?<=\<\/)(.*?)(?=\>)/', 'ns2:$1', $xml ); 
    .
    .
}

or suggested: for different namespace

public function addNameSpace($xml, $namespace)
{
    $xml = preg_replace( '/(?<=\<)([^\/].*?)(?=\>)/', $namespace.'$1', $xml );
    $xml = preg_replace( '/(?<=\<\/)(.*?)(?=\>)/', $namespace.'$1', $xml ); 
    .
    .
}

Answer 2

Right now on which technology you are using .. there is a method in spring in which you can add prefix to each element ..

marshaller.setProperty("com.sun.xml.bind.namespacePrefixMapper", new NamespacePrefixMapper() {
             @Override
            public String getPreferredPrefix(String arg0, String arg1, boolean arg2) {
                return "ns1";
            }
        });'

Or there is another way to do this

@XmlSchema(
    namespace = "http://www.example.com/a",
    elementFormDefault = XmlNsForm.QUALIFIED,
    xmlns = {
        @XmlNs(prefix="ns1", namespaceURI="http://www.example.com/a")
    }
)  

package authenticator.beans.login;
import javax.xml.bind.annotation.*;