Return a Dictionary object which is a subset of the given Dictionary, where the tags all begin with the given tag. - Java java.util

Java examples for java.util:Dictionary

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Description

Return a Dictionary object which is a subset of the given Dictionary, where the tags all begin with the given tag.

Demo Code

/* --------------------------------------------------------===
 * TradeManager : An application to trade strategies for the Java(tm) platform
 * --------------------------------------------------------===
 *
 * (C) Copyright 2011-2011, by Simon Allen and Contributors.
 *
 * Project Info:  org.trade/*from  w  w  w .j  a  v a  2 s .  com*/
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
 * (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 *
 * [Java is a trademark or registered trademark of Oracle, Inc.
 * in the United States and other countries.]
 *
 * (C) Copyright 2011-2011, by Simon Allen and Contributors.
 *
 * Original Author:  Simon Allen;
 * Contributor(s):   -;
 *
 * Changes
 * -------
 *
 */
//package com.book2s;

import java.util.Dictionary;
import java.util.Enumeration;

public class Main {
    /**
     * Return a Dictionary object which is a subset of the given Dictionary,
     * where the tags all <b>begin</b> with the given tag.
     * 
     * Hastables and Properties can be used as they are Dictionaries.
     * 
     * @param superset
     *            .
     * 
     * 
     * @param tag
     *            String
     * @param result
     *            Dictionary<String,Object>
     */
    public static void getSubset(Dictionary<String, Object> superset,
            String tag, Dictionary<String, Object> result) {
        if ((result == null) || (tag == null) || (superset == null)) {
            throw new IllegalArgumentException(
                    "Invalid arguments specified : superset = " + superset
                            + " tag = " + tag + " result = " + result);
        }

        String key;
        Enumeration<String> enumKey = superset.keys();

        while (enumKey.hasMoreElements()) {
            key = enumKey.nextElement();

            if (key.startsWith(tag)) {
                result.put(key, superset.get(key));
            }
        }
    }
}

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