1 /*

     2  * Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 package java.net.http.internal.hpack;

    26 

    27 import java.nio.ByteBuffer;

    28 

    29 abstract class IndexNameValueWriter implements BinaryRepresentationWriter {

    30 

    31     private final int pattern;

    32     private final int prefix;

    33     private final IntegerWriter intWriter = new IntegerWriter();

    34     private final StringWriter nameWriter = new StringWriter();

    35     private final StringWriter valueWriter = new StringWriter();

    36 

    37     protected boolean indexedRepresentation;

    38 

    39     private static final int NEW               = 0;

    40     private static final int NAME_PART_WRITTEN = 1;

    41     private static final int VALUE_WRITTEN     = 2;

    42 

    43     private int state = NEW;

    44 

    45     protected IndexNameValueWriter(int pattern, int prefix) {

    46         this.pattern = pattern;

    47         this.prefix = prefix;

    48     }

    49 

    50     IndexNameValueWriter index(int index) {

    51         indexedRepresentation = true;

    52         intWriter.configure(index, prefix, pattern);

    53         return this;

    54     }

    55 

    56     IndexNameValueWriter name(CharSequence name, boolean useHuffman) {

    57         indexedRepresentation = false;

    58         intWriter.configure(0, prefix, pattern);

    59         nameWriter.configure(name, useHuffman);

    60         return this;

    61     }

    62 

    63     IndexNameValueWriter value(CharSequence value, boolean useHuffman) {

    64         valueWriter.configure(value, useHuffman);

    65         return this;

    66     }

    67 

    68     @Override

    69     public boolean write(HeaderTable table, ByteBuffer destination) {

    70         if (state < NAME_PART_WRITTEN) {

    71             if (indexedRepresentation) {

    72                 if (!intWriter.write(destination)) {

    73                     return false;

    74                 }

    75             } else {

    76                 if (!intWriter.write(destination) ||

    77                         !nameWriter.write(destination)) {

    78                     return false;

    79                 }

    80             }

    81             state = NAME_PART_WRITTEN;

    82         }

    83         if (state < VALUE_WRITTEN) {

    84             if (!valueWriter.write(destination)) {

    85                 return false;

    86             }

    87             state = VALUE_WRITTEN;

    88         }

    89         return state == VALUE_WRITTEN;

    90     }

    91 

    92     @Override

    93     public IndexNameValueWriter reset() {

    94         intWriter.reset();

    95         if (!indexedRepresentation) {

    96             nameWriter.reset();

    97         }

    98         valueWriter.reset();

    99         state = NEW;

   100         return this;

   101     }

   102 }