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(Java) Removing / Deleting Child Nodes from XML

Demonstrates various methods for removing child nodes from an XML document.

The input XML, available at http://www.chilkatsoft.com/data/fruit.xml, is this:

<root>
    <fruit color="red">apple</fruit>
    <fruit color="green">pear</fruit>
    <veg color="orange">carrot</veg>
    <meat animal="cow">beef</meat>
    <xyz>
        <fruit color="blue">blueberry</fruit>
        <veg color="green">broccoli</veg>
    </xyz>
    <fruit color="purple">grape</fruit>
    <cheese color="yellow">cheddar</cheese>
</root>

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import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    CkXml xml = new CkXml();
    CkXml xyz;

    boolean success;
    //  The sample input XML is available at http://www.chilkatsoft.com/data/fruit.xml
    success = xml.LoadXmlFile("fruit.xml");
    if (success != true) {
        System.out.println(xml.lastErrorText());
        return;
    }

    //  The RemoveChild method removes (discards) all direct
    //  children having the specified tag:
    xml.RemoveChild("fruit");

    //  Show the resulting XML:
    System.out.println("Result with all direct children having a tag equal to \"fruit\" removed:");
    System.out.println(xml.getXml());

    //  The XML with the "fruit" direct children removed is shown below:
    //  Notice that the "fruit" node beneath "xyz" was not removed.
    //  This correct because it was not a direct child of the calling node.
    
/*
<root>
    <veg color="orange">carrot</veg>
    <meat animal="cow">beef</meat>
    <xyz>
        <fruit color="blue">blueberry</fruit>
        <veg color="green">broccoli</veg>
    </xyz>
    <cheese color="yellow">cheddar</cheese>
</root>
*/ // -------------------------------------------------------------------------- // Restore the original XML: success = xml.LoadXmlFile("fruit.xml"); // The RemoveChildWithContent method removes the child // having the exact content specified, regardless of the tag. // For example: xml.RemoveChildWithContent("pear"); // Show the resulting XML: System.out.println("Result with the node containing \"pear\" removed:"); System.out.println(xml.getXml()); // -------------------------------------------------------------------------- // Restore the original XML: success = xml.LoadXmlFile("fruit.xml"); // The RemoveChildByIndex method removes the Nth direct // child. Indexing begins at 0. The "xyz" child is at index 4: xml.RemoveChildByIndex(4); // Show the resulting XML: // Notice that the entire "xyz" subtree is removed. System.out.println("Result with the node at index 4 removed:"); System.out.println(xml.getXml()); // -------------------------------------------------------------------------- // Restore the original XML: success = xml.LoadXmlFile("fruit.xml"); // Navigate to the node with tag "xyz"; xyz = xml.FindChild("xyz"); // Remove the "xyz" subtree making it it's own XML document // with the "xyz" node at the root: xyz.RemoveFromTree(); // Show both XML documents: System.out.println(xyz.getXml()); System.out.println(xml.getXml()); // Also, the TreeId property is an integer value assigned // to nodes in an XML document. All nodes belonging to // the same XML document will have the same TreeId. // Notice that the "xyz" node now has a different TreeId: System.out.println("xyz TreeId = " + xyz.get_TreeId()); System.out.println("xml TreeId = " + xml.get_TreeId()); } }
 

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