Java XML Attribute from Node getYesNoAttrVal(final NamedNodeMap nnm, final String name)

Description

The attribute value of the named attribute in the given map must be absent or "yes" or "no".

License

Apache License

Parameter

Parameter	Description
nnm	NamedNodeMap
name	String name of desired attribute

Exception

Parameter	Description
SAXException	an exception

Return

Boolean attribute value or null

Declaration

public static Boolean getYesNoAttrVal(final NamedNodeMap nnm, final String name) throws SAXException 

Method Source Code

//package com.java2s;
/* ********************************************************************
Licensed to Jasig under one or more contributor license
agreements. See the NOTICE file distributed with this work
for additional information regarding copyright ownership.
Jasig licenses this file to you under the Apache License,
Version 2.0 (the "License"); you may not use this file
except in compliance with the License. You may obtain a
copy of the License at://  ww w  . j a  v  a  2s .c o  m
    
http://www.apache.org/licenses/LICENSE-2.0
    
Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on
an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied. See the License for the
specific language governing permissions and limitations
under the License.
*/

import org.w3c.dom.Attr;

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

import org.xml.sax.SAXException;

public class Main {
    /** The attribute value of the named attribute in the given map must be
     * absent or "yes" or "no".
     *
     * @param nnm         NamedNodeMap
     * @param name        String name of desired attribute
     * @return Boolean    attribute value or null
     * @throws SAXException
     */
    public static Boolean getYesNoAttrVal(final NamedNodeMap nnm, final String name) throws SAXException {
        String val = getAttrVal(nnm, name);

        if (val == null) {
            return null;
        }

        if ((!"yes".equals(val)) && (!"no".equals(val))) {
            throw new SAXException("Invalid attribute value: " + val);
        }

        return new Boolean("yes".equals(val));
    }

    /** Return the value of the named attribute of the given element.
     *
     * @param el          Element
     * @param name        String name of desired attribute
     * @return String     attribute value or null
     * @throws SAXException
     */
    public static String getAttrVal(final Element el, final String name) throws SAXException {
        Attr at = el.getAttributeNode(name);
        if (at == null) {
            return null;
        }

        return at.getValue();
    }

    /** Return the attribute value of the named attribute from the given map.
     *
     * @param nnm         NamedNodeMap
     * @param name        String name of desired attribute
     * @return String     attribute value or null
     */
    public static String getAttrVal(final NamedNodeMap nnm, final String name) {
        Node nmAttr = nnm.getNamedItem(name);

        if ((nmAttr == null) || (absent(nmAttr.getNodeValue()))) {
            return null;
        }

        return nmAttr.getNodeValue();
    }

    private static boolean absent(final String val) {
        return (val == null) || (val.length() == 0);
    }
}

Related

1. getXMLDate(Element e, String attrName)
2. getXMLInt(Element e, String attrName)
3. getXMLInt(Element e, String attrName)
4. getXmlNodeAttribute(String attributeName, NodeList nodeList)
5. getXmlNodeAttributeValue(Node NN, String AttrName)
6. hasAttribByName(Element node, String name)
7. parseAttribute(Node lnNode, String attributeName)
8. parseAttribute(NodeList abtList)
9. parseAttributes(Node n)