Java – How to insert XmlCursor content to DOM Document

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Some API returns me XmlCursor pointing on root of XML Document. I need to insert all of this into another org.w3c.DOM represented document.

At start:
XmlCursor poiting on

<a> <b> some text </b> </a>

DOM Document:


<foo>

</foo>

At the end I want to have original DOM document changed like this:


<foo>
  <someOtherInsertedElement>
    <a>

  <b>

    some text

  </b>

</a>
  </someOtherInsertedElement>

</foo>

NOTE: document.importNode(cursor.getDomNode()) doesn't work – Exception is thrown: NOT_SUPPORTED_ERR: The implementation does not support the requested type of object or operation.

Best Solution

Try something like this:

Node originalNode = cursor.getDomNode();
Node importNode = document.importNode(originalNode.getFirstChild());
Node otherNode = document.createElement("someOtherInsertedElement");
otherNode.appendChild(importNode);
document.appendChild(otherNode);

So in other words:

Get the DOM Node from the cursor. In this case, it's a DOMDocument, so do getFirstChild() to get the root node.
Import it into the DOMDocument.
Do other stuff with the DOMDocument.
Append the imported node to the right Node.

The reason to import is that a node always "belongs" to a given DOMDocument. Just adding the original node would cause exceptions.

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Update:

Some 10 years later perhaps the best way to test a private method, or any inaccessible member, is via @Jailbreak from the Manifold framework.
@Jailbreak Foo foo = new Foo();
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This way your code remains type-safe and readable. No design compromises, no overexposing methods and fields for the sake of tests.

If you have somewhat of a legacy Java application, and you're not allowed to change the visibility of your methods, the best way to test private methods is to use reflection.

Internally we're using helpers to get/set private and private static variables as well as invoke private and private static methods. The following patterns will let you do pretty much anything related to the private methods and fields. Of course, you can't change private static final variables through reflection.

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And for fields:

Field field = TargetClass.getDeclaredField(fieldName);
field.setAccessible(true);
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1. TargetClass.getDeclaredMethod(methodName, argClasses) lets you look into private methods. The same thing applies for getDeclaredField.
2. The setAccessible(true) is required to play around with privates.

Java – How to efficiently iterate over each entry in a Java Map

Map<String, String> map = ...
for (Map.Entry<String, String> entry : map.entrySet()) {
    System.out.println(entry.getKey() + "/" + entry.getValue());
}

On Java 10+:

for (var entry : map.entrySet()) {
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