Error: Unable to transform org.w3c.dom.domElement into a boolean value

After translating the Javascript code to Java, I came across an issue within the sib; portion. More information can be found at:

I am unfamiliar with such for statements. What is the function of adding a semicolon? Does it behave like a while() statement?

 public static String getElementXpath(DOMElement elt){
        String path = ""; 
        for (;elt.ELEMENT_NODE == elt.getNodeType(); elt = (DOMElement) elt.getParentNode()){
            int idx = getElementIdx(elt);
        }
    return path;        
}

private static int getElementIdx(DOMElement elt) {
    int count = 1;

     for (DOMElement sib = (DOMElement) elt.getPreviousSibling(); sib ; sib = (DOMElement) sib.getPreviousSibling())
        {
            if(sib.ELEMENT_NODE == sib.getNodeType() && sib.getTagName() == elt.getTagName()) count++;
        }

    return count;
}
javajavascript

Answer №1

When dealing with javascript, the second part of the for statement 

for (DOMElement sib = (DOMElement) elt.getPreviousSibling(); sib ; sib = (DOMElement) sib.getPreviousSibling())
(specifically ; sib;), is responsible for verifying if sib exists. To adapt this to Java, you must use ; sib != null;. This adjustment ensures the same functionality.

Hence, the complete for statement should read as follows: 

for (DOMElement sib = (DOMElement) elt.getPreviousSibling(); sib != null ; sib = (DOMElement) sib.getPreviousSibling())

Answer №2

If we focus on the initial for loop:

for (;elt.ELEMENT_NODE == elt.getNodeType(); elt = (DOMElement) elt.getParentNode())

The presence of a semicolon as the initializer indicates that no initialization is needed.

A typical for loop looks like this: for (initialize; condition; update), whereas in your case, only the condition and update parts are present. Since the DOMElement is passed in as a parameter without any additional steps required before using it in the for loop.

In reply to the comment:

Prior to each iteration of the loop, the test 

elt.ELEMENT_NODE == elt.getNodeType()
is conducted to ensure that the node referenced by elt is an element node (not a text node, attribute node, comment node, etc.). If the test fails, then the body of the loop executes.

Within the loop's body, the function getElementIdx is invoked to determine the relative position of this node among any siblings with the same name. This calculated value is assigned to idx, but is ultimately not utilized and subsequently discarded.

Following the execution of the loop's body, the update 

elt = (DOMElement) elt.getParentNode()
occurs, causing elt to point to the parent node of its previous reference.

As a preliminary suggestion, I would recommend replacing 

elt.ELEMENT_NODE == elt.getNodeType()
with 
Node.DOCUMENT_NODE == elt.getNodeType()
(refer to the commentary by Paŭlo Ebermann below), which enables your program to traverse back through the parent nodes until reaching the document's root.

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