Java XML Attribute Get getAttribute(final Node xml, final String namespaceURI, final String localName)

Description

Retrieves the desired attribute from the given Node

License

Open Source License

Parameter

Parameter	Description
xml	the Node
namespaceURI	the attribute namespace URI String
localName	the attribute local name String

Return

the attribute value String

Declaration

public final static String getAttribute(final Node xml, final String namespaceURI, final String localName) 

Method Source Code

//package com.java2s;
/**/*from  w  w w  .  j a v a2s  . co  m*/
 * The contents of this file are subject to the Regenstrief Public License
 * Version 1.0 (the "License"); you may not use this file except in compliance with the License.
 * Please contact Regenstrief Institute if you would like to obtain a copy of the license.
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
 * License for the specific language governing rights and limitations
 * under the License.
 *
 * Copyright (C) Regenstrief Institute.  All Rights Reserved.
 */

import org.w3c.dom.*;

public class Main {
    /**
     * Retrieves the desired attribute from the given Node
     * 
     * @param xml the Node
     * @param attr the attribute name String
     * @return the attribute value String
     **/
    public final static String getAttribute(final Node xml, final String attr) {
        if (xml == null) {
            return null;
        }
        final NamedNodeMap attrs = xml.getAttributes();
        return attrs == null ? null : xmlFindTextNode(attrs.getNamedItem(attr));
    }

    /**
     * Retrieves the desired attribute from the given Node
     * 
     * @param xml the Node
     * @param namespaceURI the attribute namespace URI String
     * @param localName the attribute local name String
     * @return the attribute value String
     **/
    public final static String getAttribute(final Node xml, final String namespaceURI, final String localName) {
        return xml == null ? null : xmlFindTextNode(xml.getAttributes().getNamedItemNS(namespaceURI, localName));
    }

    /**
     * returns contents of first TextNode defined within an XML Node
     * 
     * @param xmlNode parsed XML Node in which to look for a TextNode
     * @return text character string value of text node
     **/
    public static String xmlFindTextNode(final Node xmlNode) {
        if (xmlNode == null) {
            return null;
        }

        final NodeList children = xmlNode.getChildNodes();
        final int childrenCnt = size(children);
        for (int j = 0; j < childrenCnt; j++) {
            final Node childNode = children.item(j);
            if ((childNode != null) && (childNode.getNodeType() == Node.TEXT_NODE)) {
                return childNode.getNodeValue();
            }
        }
        return null;
    }

    public static Node getNamedItem(final NamedNodeMap nodeMap, final String name) {
        return nodeMap == null ? null : nodeMap.getNamedItem(name);
    }

    public static Node getNamedItemNS(final NamedNodeMap nodeMap, final String namespaceURI,
            final String localName) {
        return nodeMap == null ? null : nodeMap.getNamedItemNS(namespaceURI, localName);
    }

    /**
     * Retrieves the number of Nodes in the NodeList
     * 
     * @param nodeList the NodeList
     * @return the number of Nodes
     **/
    public final static int size(final NodeList nodeList) {
        return nodeList == null ? 0 : nodeList.getLength();
    }

    /**
     * Retrieves the number of Nodes in the NamedNodeMap
     * 
     * @param nodeMap the NamedNodeMap
     * @return the number of Nodes
     **/
    public final static int size(final NamedNodeMap nodeMap) {
        return nodeMap == null ? 0 : nodeMap.getLength();
    }

    /**
     * Retrieves the number of Nodes in the tree rooted at the given Node
     * 
     * @param node the root Node
     * @return the number of Nodes
     **/
    public final static int size(final Node node) {
        if (node == null) {
            return 0;
        }

        final NodeList children = node.getChildNodes();
        int size = 1;
        for (int i = 0, n = size(children); i < n; i++) {
            size += size(children.item(i));
        }

        return size;
    }
}

Related

1. getAttribute(final Node iNode, final String iAttributeName)
2. getAttribute(final Node n, final String attrName, final String defaultValue)
3. getAttribute(final Node node, final String attribname, final int def)
4. getAttribute(final Node node, final String attributeName)
5. getAttribute(final Node node, final String name)
6. getAttribute(NamedNodeMap map, String name)
7. getAttribute(NamedNodeMap namedNodeMap, String name)
8. getAttribute(NamedNodeMap ruleAttributes, String attributeName)
9. getAttribute(Node aNode, String attributeName)