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Thread: How to read an integer attribute using dom.element

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    Default How to read an integer attribute using dom.element

    I don't know how to read the attribute maxLenth. The way in the image I have done drive me to the error below.!

    Piece of XSL:

    <?xml version="1.0" encoding="UTF-8"?>

    <c:message xmlns:c="ictt"><c:de format="B" lengthField="0" name="BIT MAP, PRIMARY" number="000"/><c:de format="B" lengthField="0" maxLength="008" minLength="008" name="BIT MAP, SECONDARY" number="001" subFields="00"/>


    Piece of Java Code:
    int length = Integer.parseInt(spec.getAttribute("maxLength"));

    [5/13/14 14:52:19:497 CDT] 00000028 SystemErr R java.lang.NumberFormatException: For input string: ""

    [5/13/14 14:52:19:497 CDT] 00000028 SystemErr R at java.lang.NumberFormatException.forInputString(Num berFormatException.java:63)

    [5/13/14 14:52:19:497 CDT] 00000028 SystemErr R at java.lang.Integer.parseInt(Integer.java:502)

    [5/13/14 14:52:19:497 CDT] 00000028 SystemErr R at java.lang.Integer.parseInt(Integer.java:531)









    maxlenth.jpg
    Last edited by DemeCarv; May 13th, 2014 at 04:18 PM.


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    Default Re: How to read an integer attribute using dom.element

    Please post the code here that you have questions about. Be sure to wrap the code in code tags.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: How to read an integer attribute using dom.element

    Quote Originally Posted by DemeCarv View Post
    Piece of XSL:

    <?xml version="1.0" encoding="UTF-8"?>

    <c:message xmlns:c="ictt"><c:de format="B" lengthField="0" name="BIT MAP, PRIMARY" number="000"/><c:de format="B" lengthField="0" maxLength="008" minLength="008" name="BIT MAP, SECONDARY" number="001" subFields="00"/>


    Piece of Java Code:
    int length = Integer.parseInt(spec.getAttribute("maxLength"));
    maxLength is an attribute of the c:de element, and the above call (where spec is an Element object) is the correct call to do this. However from the XML (not XSL) fragment above you'd see that the first c:de element does not have the maxLength attribute. Also, the image you attached to your post is too small to make out what spec is. (Btw, please paste your code into your post as text, wrapped in [code] tags, and not as a screenshot.)

    Quote Originally Posted by DemeCarv View Post
    [5/13/14 14:52:19:497 CDT] 00000028 SystemErr R java.lang.NumberFormatException: For input string: ""
    What we know from the exception message that the call to getAttribute() returned an empty string. The API doc for this method states,

    "Returns:
    The Attr value as a string, or the empty string if that attribute does not have a specified or default value."

    Therefore it is possible that spec is referring to an element that does not have the maxLength attribute, just like the first c:de element.

    You can confirm this by using hasAttribute(String name), or by printing out the element, e.g., via an identity transform:
    Transformer transformer = TransformerFactory.newInstance().newTransformer();
    transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
    transformer.transform(new DOMSource(spec), new StreamResult(System.out));

    If you're still unable to solve this problem, we'll need more than the 1 line of code and a tiny screenshot.

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