Extracts the library namespace from the given qualified reference value. - Java Reflection

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Description

Extracts the library namespace from the given qualified reference value.

Demo Code

/*******************************************************************************
 * Copyright (c) 2004 Actuate Corporation.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors://  w w  w .  j av a  2s . c o  m
 *  Actuate Corporation  - initial API and implementation
 *******************************************************************************/


public class Main{
    public static void main(String[] argv){
        String qualifiedName = "java2s.com";
        System.out.println(extractNamespace(qualifiedName));
    }
    /**
     * Extracts the library namespace from the given qualified reference value.
     * <p>
     * For example,
     * <ul>
     * <li>"LibA" is extracted from "LibA.style1"
     * <li>null is returned from "style1"
     * </ul>
     * 
     * @param qualifiedName
     *            the qualified reference value
     * @return the library namespace
     */

    public static String extractNamespace(String qualifiedName) {
        if (qualifiedName == null)
            return null;

        int pos = qualifiedName.indexOf('.');
        if (pos == -1)
            return null;

        return trimString(qualifiedName.substring(0, pos));
    }
    /**
     * Trim a string. Removes leading and trailing blanks. If the resulting
     * string is empty, normalizes the string to an null string.
     * 
     * @param value
     *            the string to trim
     * @return the trimmed string, or null if the string is empty
     */

    public static String trimString(String value) {
        if (value == null)
            return null;
        value = value.trim();
        if (value.length() == 0)
            return null;
        return value;
    }
}

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