/*
 * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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 General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.sun.javafx.binding;

import javafx.beans.WeakListener;

/**
 */
public class ExpressionHelperBase {

    protected static int trim(int size, Object[] listeners) {
        for (int index = 0; index < size; index++) {
            final Object listener = listeners[index];
            if (listener instanceof WeakListener) {
                if (((WeakListener)listener).wasGarbageCollected()) {
                    final int numMoved = size - index - 1;
                    if (numMoved > 0)
                        System.arraycopy(listeners, index+1, listeners, index, numMoved);
                    listeners[--size] = null; // Let gc do its work
                    index--;
                }
            }
        }
        return size;
    }

}
