Main.java Source code

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Here is the source code for Main.java

Source

//package com.java2s;

import org.w3c.dom.Attr;

import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;

public class Main {
    /**
     * Renames the attribute with the new name
     * 
     * @param elementObject
     *            the element object
     * @param oldName
     *            Old name of the attribute
     * @param newName
     *            New name of the attribute
     */
    public static void renameAttribute(final Element elementObject, final String oldName, final String newName)
            throws IllegalArgumentException {
        // Validate element Object
        if (elementObject == null) {
            throw new IllegalArgumentException(
                    "Element object cannot be null" + " in XmlUtils.renameAttribute method");
        }

        // Validate old name
        if (oldName == null) {
            throw new IllegalArgumentException("Old name cannot be null" + " in XmlUtils.renameAttribute method");
        }

        // Validate new name
        if (newName == null) {
            throw new IllegalArgumentException("New name cannot be null" + " in XmlUtils.renameAttribute method");
        }

        // the attribute value
        String attributeValue = null;

        // get the value of the attribute
        attributeValue = getAttribute(elementObject, oldName, null);

        // remove the old attribute
        elementObject.removeAttribute(oldName);

        // if the attribute value is not null then set the attribute
        if (attributeValue != null) {
            elementObject.setAttribute(newName, attributeValue);
        }
    }

    /**
     * Gets value of an attribute from node
     * 
     * @param node
     *            Node Object
     * @param attributeName
     *            Attribute Name
     * @return Attribute Value
     * @throws IllegalArgumentException
     *             for Invalid input
     */
    public static String getAttribute(final Node node, final String attributeName) throws IllegalArgumentException {
        // Validate attribute name
        if (attributeName == null) {
            throw new IllegalArgumentException("Attribute Name cannot be null in XmlUtils.getAttribute method");
        }

        // Validate node
        if (node == null) {
            throw new IllegalArgumentException(
                    "Node cannot be null in XmlUtils.getAttribute method for attribute name:" + attributeName);
        }

        final NamedNodeMap attributeList = node.getAttributes();
        if (attributeList != null) {
            final Node attribute = attributeList.getNamedItem(attributeName);
            return attribute == null ? null : ((Attr) attribute).getValue();
        } else {
            return null;
        }

    }

    /**
     * Gets value of an attribute from node. Returns default value if attribute
     * not found.
     * 
     * @param node
     *            Node Object
     * @param attributeName
     *            Attribute Name
     * @param defaultValue
     *            Default value if attribute not found
     * @return Attribute Value
     * @throws IllegalArgumentException
     *             for Invalid input
     */
    public static String getAttribute(final Node node, final String attributeName, final String defaultValue)
            throws IllegalArgumentException {
        // Validate attribute name
        if (attributeName == null) {
            throw new IllegalArgumentException(
                    "Attribute Name " + " cannot be null in XmlUtils.getAttribute method");
        }

        // Validate node
        if (node == null) {
            throw new IllegalArgumentException("Node cannot " + " be null in XmlUtils.getAttribute method for "
                    + "Attribute Name:" + attributeName);
        }

        final NamedNodeMap attributeList = node.getAttributes();
        final Node attribute = attributeList.getNamedItem(attributeName);

        // Validate attribute name
        if (attribute == null) {
            return defaultValue;
        }

        return ((Attr) attribute).getValue();
    }
}