update data in java class as per change in attribute in the xml file

Question

I want to add an attribute to the xml defination file

Now i want this change to be reflected in a java class . Can you suggest as to how it can be done . Also i w

Answer 1

As you already have a schema for your xml files and you want java classes for the data types, consider using JAXB. This xml binding API can autogenerate classes from schemas and it provides convenient methods to marshal and unmarschal XML documents. (IAW: "convert an XML into java instances and vice versa).

Answer 2

Try to implement using this code

your attribute.xml

<attributes>
    <attribute-list>
            <attribute>
                <fname>riddhish</fname>
            <lname>chaudhari</lname>
        </attribute>
    </attribute-list>
<attributes>

Class File

public static final String ATTRIBUTE_LIST = "ATTRIBUTE_LIST";
public static final String ATTRIBUTE = "ATTRIBUTE";
public static final String FNAME = "FNAME";

Code for rading attributes from xml file

Document document = null;
NodeList nodeList = null;
Node node = null;

nodeList = document.getElementsByTagName("----file attributes.xml---").item(0).getChildNodes();
HashMap <String,Object> localParameterMap  = new HashMap<String,Object>();

for(int i=0; i<nodeList.getLength(); i++){
    node = nodeList.item(i);
    if(node.getNodeName().equals("attribute-list")){
        Collection objCollection = readAttributeList(node);
        localParameterMap.put(ATTRIBUTE_LIST, objCollection);
    }
}

function() readAttributeList

private Collection readAttributeList(Node node){
    Collection<Object> objCollection = new ArrayList<Object>();
    NodeList nodeList = node.getChildNodes();   

    for(int i=0; i < nodeList.getLength(); i++){
        Node subNode = nodeList.item(i);

        if(subNode.getNodeName().equals("attribute")){
            NodeList attributeList = subNode.getChildNodes();
            HashMap <String,Object> attributeMap  = new HashMap<String,Object>();

                for(int j=0; j<attributeList.getLength(); j++){
                    Node attributeNode = attributeList.item(j);

                    if(attributeNode.getNodeName().equals("fname")){
                        attributeMap.put(FNAME, attributeNode.getTextContent().trim());
                    }   
                }
        }
        objCollection.add(attributeMap);
    }
    return objCollection;
}

for reading attribute values in variable

String strfname = null;

if(map.get(CLASS_NAME.FNAME) != null) {
    strfname = (String)map.get(CLASS_NAME.FNAME);
}