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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2015 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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/*
 * Copyright (c) 2014, 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.
 *
 * 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).
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 * 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 org.glassfish.grizzly.http2.hpack;

//
//
public final class Hpack {
    private static final int DEFAULT_MAX_HEADER_TABLE_SIZE = 4096;
    
    private Hpack() {
        throw new AssertionError();
    }

    public static Decoder newDecoder(final int maxHeaderTableSize) {
        return new Decoder(checkMaxHeaderTableSize(maxHeaderTableSize));
    }

    public static Encoder newEncoder(final int maxHeaderTableSize) {
        return newEncoder(new DefaultEncoding(true),
                checkMaxHeaderTableSize(maxHeaderTableSize));
    }
    
    public static Encoder newEncoder() {
        // TODO: should there be a system property for huffman?
        // e.g. 'blah.blah.blah.hpack.useHuffman=true'
        return newEncoder(new DefaultEncoding(true));
    }

    public static Encoder newEncoder(EncodingStrategy strategy) {
        return newEncoder(strategy, DEFAULT_MAX_HEADER_TABLE_SIZE);
    }
    
    public static Encoder newEncoder(EncodingStrategy strategy,
            final int maxHeaderTableSize) {
        
        return new Encoder(strategy,
                HeaderFieldTable.createEncodingTable(
                checkMaxHeaderTableSize(maxHeaderTableSize), 16));
    }
    
    private static int checkMaxHeaderTableSize(final int maxHeaderTableSize) {
        return maxHeaderTableSize <= 0
                ? DEFAULT_MAX_HEADER_TABLE_SIZE
                : maxHeaderTableSize;
    }
}