Groovy - Adding node to existing XML file with echoxml

Question

I am trying to insert a node into an existing XML document. I use groovy and ANT for that.

So does my XML look like:

<root>
 <node1 db="a" 
   user="test"/>
</root>

Within this XML file I have a groovy section that looks that way:

My groovy script, embedded in the ANT xml file.

<target name="some-target">
 <script language="groovy">
 def fragment = '''&lt;root&gt;
 &lt;node1 db=&quot;a&quot; 
   user=&quot;test&quot;/&gt;
&lt;/root&gt;''';

def parser = new XmlParser();
xml.appendNode{fragment};

def xmlOutput = new StringWriter();
def xmlNodePrinter = new XmlNodePrinter(new PrintWriter(xmlOutput));      
xmlNodePrinter.print(xml);

Now, I just want to add a second node, but I do not how to achieve that?

If I add now a second node I always get the following output in the result:

<root>
 <node1 db="a" 
   user="test"/>
   <Script1$_run_closure2@451001e5/>
</root>

Thank you for your help in advance!

Answer 1

No need to use the Ant task, you can do this in plain Groovy:

Assuming you have a file variable which points to your existing XML

def fileText = new File('/tmp/test.xml')

Then, you can do:

import groovy.xml.*

def fileText = new File('/tmp/test.xml')

def parser = new XmlParser()

def xml = parser.parse('/tmp/test.xml')

// Add a new node
xml.append(parser.parseText('<node2 db="c" user="test2"/>'))

// Write it out over the top of the original file
def xmlOutput = new StringWriter()
def xmlNodePrinter = new XmlNodePrinter(new PrintWriter(xmlOutput))
xmlNodePrinter.print(xml)
fileText.text = xmlOutput.toString()

Edit

Right, here's 2 methods to append a node. I've put xmltask.jar in the same folder as the build. The first target uses xmltask, the second uses groovy.

I've also added test.xml to the same directory, and this is what is read-in, appended to and written out

<project name="Xml Foozling" basedir=".">

  <path id="runtime.path">
    <pathelement location="xmltask.jar"/>
  </path>

  <taskdef name="xmltask" classname="com.oopsconsultancy.xmltask.ant.XmlTask" classpathref="runtime.path"/>

  <target name="insert-node-with-xml-task">
    <xmltask source="test.xml" dest="output-task.xml">
        <insert path="/root">
          <![CDATA[
          <node1 db="new"  user="hooray"/>
          ]]>
        </insert>
    </xmltask>
  </target>

  <target name="insert-node-with-groovy">
    <script language="groovy">
      <![CDATA[
      import groovy.xml.*

      new XmlParser().with { parser ->
        parser.parse('test.xml').with { xml ->
          xml.append(parser.parseText('<node2 db="new" user="hooray"/>'))
          new File('output-script.xml').withWriter { out ->
            new XmlNodePrinter(new PrintWriter(out)).print(xml)
          }
        }
      }
      ]]>
    </script>
  </target>

</project>

Fingers crossed