spaceutil.java

java pos,你可以直接编译运行,

/*
 * Copyright (c) 2000 jPOS.org.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *    "This product includes software developed by the jPOS project 
 *    (http://www.jpos.org/)". Alternately, this acknowledgment may 
 *    appear in the software itself, if and wherever such third-party 
 *    acknowledgments normally appear.
 *
 * 4. The names "jPOS" and "jPOS.org" must not be used to endorse 
 *    or promote products derived from this software without prior 
 *    written permission. For written permission, please contact 
 *    [e-mail].
 *
 * 5. Products derived from this software may not be called "jPOS",
 *    nor may "jPOS" appear in their name, without prior written
 *    permission of the jPOS project.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  
 * IN NO EVENT SHALL THE JPOS PROJECT OR ITS CONTRIBUTORS BE LIABLE FOR 
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
 * POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the jPOS Project.  For more
 * information please see <http://www.jpos.org/>.
 */

package org.jpos.space;

import java.util.List;
import java.util.ArrayList;

/**
 * Space related helper methods
 *
 * @author Alejandro Revilla
 * @version $Revision: 1.2 $ $Date: 2004/04/10 21:23:31 $
 * @since 1.4.7
 */

public class SpaceUtil {
    /**
     * return all entries under a given key
     *
     * @param sp the Space
     * @param key Entry's key
     * @return array containing all entries under key
     */
    public static Object[] inpAll (Space sp, Object key) {
        List list = new ArrayList();
        Object value;
        do {
            value = sp.inp (key);
            if (value != null) {
                list.add (value);
            }
        } while (value != null);
        return list.toArray();
    }

    /**
     * Remove all entries under key
     *
     * @param sp the Space
     * @param key Entry's key
     */
    public static void wipe (Space sp, Object key) {
        while (sp.inp (key) != null)
            ;
    }
    public static long nextLong (Space sp, Object key) {
        long l = 0L;
        synchronized (sp) {
            Object obj = sp.inp (key);
            wipe (sp, key); // just in case
            if (obj instanceof Long) 
                l = ((Long)obj).longValue();
            sp.out (key, new Long (++l));
        }
        return l;
    }
}