Extract the XML namespace prefix from the qualified element name passed in. - Java XML

Java examples for XML:DOM Element

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Description

Extract the XML namespace prefix from the qualified element name passed in.

Demo Code

/**//from   w  w w . ja v a  2 s  .  com
 * This class contains some utility methods use by the Sapia XML tools.
 *
 * @author Jean-Cedric Desrochers
 * <dl>
 * <dt><b>Copyright:</b><dd>Copyright &#169; 2002-2003 <a href="http://www.sapia-oss.org">Sapia Open Source Software</a>. All Rights Reserved.</dd></dt>
 * <dt><b>License:</b><dd>Read the license.txt file of the jar or visit the
 *        <a href="http://www.sapia-oss.org/license.html">license page</a> at the Sapia OSS web site</dd></dt>
 * </dl>
 */
//package com.java2s;

public class Main {
    public static void main(String[] argv) throws Exception {
        String aQualifiedName = "java2s.com";
        System.out.println(extractPrefix(aQualifiedName));
    }

    /** Defines the ":" delimiter that separates local name and prefix */
    private static final char PREFIX_SEPARATOR = ':';

    /**
     * Extract the namespace prefix from the qualified element name passed in.
     * If the the qualified name passed in is null, it returns null.
     *
     * @param aQualifiedName The qualified name from which to extract the prefix.
     * @return The extracted prefix or null if the qualified name is null;
     */
    public static String extractPrefix(String aQualifiedName) {
        String aPrefix = null;

        if (aQualifiedName != null) {
            int anIndex = aQualifiedName.indexOf(PREFIX_SEPARATOR);

            if (anIndex > -1) {
                aPrefix = aQualifiedName.substring(0, anIndex);
            }
        }

        return aPrefix;
    }
}

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