src/java.net.http/share/classes/jdk/internal/net/http/FilterFactory.java

/*
 * Copyright (c) 2015, 2018, 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.
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package jdk.internal.net.http;

import java.util.LinkedList;
import java.util.List;

class FilterFactory {

    // Strictly-ordered list of filters.
    final LinkedList<Class<? extends HeaderFilter>> filterClasses = new LinkedList<>();

    public void addFilter(Class<? extends HeaderFilter> type) {
        filterClasses.add(type);
    }

    LinkedList<HeaderFilter> getFilterChain() {
        LinkedList<HeaderFilter> l = new LinkedList<>();
        for (Class<? extends HeaderFilter> clazz : filterClasses) {
            try {
                // Requires a public no arg constructor.
                HeaderFilter headerFilter = clazz.getConstructor().newInstance();
                l.add(headerFilter);
            } catch (ReflectiveOperationException e) {
                throw new InternalError(e);
            }
        }
        return l;
    }
}