Java XML NodeList isEmpty(NodeList nl)

Description

Test if node list is null or empty.

License

Apache License

Declaration

public static boolean isEmpty(NodeList nl) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.lang.reflect.Method;

import java.util.Collection;
import java.util.Map;

import org.w3c.dom.NodeList;

public class Main {
    /** Test if array is null or empty. */
    public static boolean isEmpty(byte[] ba) {
        return ba == null || ba.length == 0;
    }/*w  ww.ja  v a  2s .co  m*/

    /** Test if array is null or empty. */
    public static boolean isEmpty(Object[] oa) {
        return oa == null || oa.length == 0;
    }

    /** Test if string is null or empty. */
    public static boolean isEmpty(CharSequence s) {
        return s == null || s.length() == 0;
    }

    /** Test if string is null or empty. */
    public static boolean isEmpty(Appendable s) {
        int length = -1;
        if (s != null) {
            Method m = null;
            Class<? extends Appendable> sclass = s.getClass();
            try {
                m = sclass.getMethod("size");
            } catch (NoSuchMethodException e1) {
                try {
                    m = sclass.getMethod("length");
                } catch (NoSuchMethodException e2) {
                    try {
                        m = sclass.getMethod("getLength");
                    } catch (NoSuchMethodException e3) {
                    }
                }
            }
            if (m != null) {
                try {
                    length = (Integer) m.invoke(s);
                } catch (Exception e) {
                }
            }
        }
        return s == null || length == 0;
    }

    /** Test if node list is null or empty. */
    public static boolean isEmpty(NodeList nl) {
        return nl == null || nl.getLength() == 0;
    }

    /** Test if map is null or empty. */
    public static boolean isEmpty(Map<?, ?> m) {
        return m == null || m.size() == 0;
    }

    /** Test if collection is null or empty. */
    public static boolean isEmpty(Collection<?> c) {
        return c == null || c.size() == 0;
    }
}

Related

1. getXmlNodeValue(NodeList nodeList)
2. hasElementNodes(NodeList list)
3. hasImageNodes(NodeList nodeList)
4. indexOf(NodeList nodeList, String tagName, int startIdx)
5. isEmpty(@Nullable final NodeList aNL)
6. isListEmpty(NodeList list)
7. isNodeListEmpty(final NodeList nodeList)
8. isNotEmpty(NodeList nodeList)
9. isNullOrEmpty(NodeList nodeList)