Copies entries from one map to another and deletes those entries in the target map for which the value in the source map is null. - Android java.util

Android examples for java.util:Map

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Description

Copies entries from one map to another and deletes those entries in the target map for which the value in the source map is null.

Demo Code

/*/*from   w  ww  .j  a  v a  2  s .  c  o  m*/
 * This library is part of Geranium -
 * an open source UI library for GWT.
 *
 * Copyright (c) Alkacon Software GmbH (http://www.alkacon.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.
 *
 * For further information about Alkacon Software, please see the
 * company website: http://www.alkacon.com
 * 
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
//package com.book2s;

import java.util.Map;

public class Main {
    /**
     * Copies entries from one map to another and deletes those entries in the target map for which
     * the value in the source map is null.<p>
     * 
     * @param <A> the key type of the map 
     * @param <B> the value type of the map 
     * @param source the source map
     * @param target the target map 
     */
    public static <A, B> void updateMapAndRemoveNulls(Map<A, B> source,
            Map<A, B> target) {

        assert source != target;
        for (Map.Entry<A, B> entry : source.entrySet()) {
            A key = entry.getKey();
            B value = entry.getValue();
            if (value != null) {
                target.put(key, value);
            } else {
                target.remove(key);
            }
        }
    }
}

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