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Java example source code file (HttpPostBodyUtil.java)

This example Java source code file (HttpPostBodyUtil.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

binary, bit7, bit8, bytebuf, default_binary_content_type, default_text_content_type, httppostbodyutil, override, seekaheadnobackarrayexception, seekaheadoptimize, string, transferencodingmechanism

The HttpPostBodyUtil.java Java example source code

/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty.handler.codec.http.multipart;

import io.netty.buffer.ByteBuf;

/**
 * Shared Static object between HttpMessageDecoder, HttpPostRequestDecoder and HttpPostRequestEncoder
 */
final class HttpPostBodyUtil {

    public static final int chunkSize = 8096;

    /**
     * Default Content-Type in binary form
     */
    public static final String DEFAULT_BINARY_CONTENT_TYPE = "application/octet-stream";

    /**
     * Default Content-Type in Text form
     */
    public static final String DEFAULT_TEXT_CONTENT_TYPE = "text/plain";

    /**
     * Allowed mechanism for multipart
     * mechanism := "7bit"
                  / "8bit"
                  / "binary"
       Not allowed: "quoted-printable"
                  / "base64"
     */
    public enum TransferEncodingMechanism {
        /**
         * Default encoding
         */
        BIT7("7bit"),
        /**
         * Short lines but not in ASCII - no encoding
         */
        BIT8("8bit"),
        /**
         * Could be long text not in ASCII - no encoding
         */
        BINARY("binary");

        private final String value;

        TransferEncodingMechanism(String value) {
            this.value = value;
        }

        TransferEncodingMechanism() {
            value = name();
        }

        public String value() {
            return value;
        }

        @Override
        public String toString() {
            return value;
        }
    }

    private HttpPostBodyUtil() {
    }

    /**
    * Exception when NO Backend Array is found
    */
    static class SeekAheadNoBackArrayException extends Exception {
        private static final long serialVersionUID = -630418804938699495L;
    }

    /**
    * This class intends to decrease the CPU in seeking ahead some bytes in
    * HttpPostRequestDecoder
    */
    static class SeekAheadOptimize {
        byte[] bytes;
        int readerIndex;
        int pos;
        int origPos;
        int limit;
        ByteBuf buffer;

        SeekAheadOptimize(ByteBuf buffer) throws SeekAheadNoBackArrayException {
            if (!buffer.hasArray()) {
                throw new SeekAheadNoBackArrayException();
            }
            this.buffer = buffer;
            bytes = buffer.array();
            readerIndex = buffer.readerIndex();
            origPos = pos = buffer.arrayOffset() + readerIndex;
            limit = buffer.arrayOffset() + buffer.writerIndex();
        }

        /**
        *
        * @param minus this value will be used as (currentPos - minus) to set
        * the current readerIndex in the buffer.
        */
        void setReadPosition(int minus) {
            pos -= minus;
            readerIndex = getReadPosition(pos);
            buffer.readerIndex(readerIndex);
        }

        /**
        *
        * @param index raw index of the array (pos in general)
        * @return the value equivalent of raw index to be used in readerIndex(value)
        */
        int getReadPosition(int index) {
            return index - origPos + readerIndex;
        }

        void clear() {
            buffer = null;
            bytes = null;
            limit = 0;
            pos = 0;
            readerIndex = 0;
        }
    }

    /**
     * Find the first non whitespace
     * @return the rank of the first non whitespace
     */
    static int findNonWhitespace(String sb, int offset) {
        int result;
        for (result = offset; result < sb.length(); result ++) {
            if (!Character.isWhitespace(sb.charAt(result))) {
                break;
            }
        }
        return result;
    }

    /**
     * Find the first whitespace
     * @return the rank of the first whitespace
     */
    static int findWhitespace(String sb, int offset) {
        int result;
        for (result = offset; result < sb.length(); result ++) {
            if (Character.isWhitespace(sb.charAt(result))) {
                break;
            }
        }
        return result;
    }

    /**
     * Find the end of String
     * @return the rank of the end of string
     */
    static int findEndOfString(String sb) {
        int result;
        for (result = sb.length(); result > 0; result --) {
            if (!Character.isWhitespace(sb.charAt(result - 1))) {
                break;
            }
        }
        return result;
    }

}

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