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EMC Atmos Client for Java - provides REST access to object data on EMC platforms using the Atmos API.
There is a newer version: 3.2.1
/*
 * Copyright (c) 2013-2016, EMC Corporation.
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * + Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 * + Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * + The name of EMC Corporation may not be used to endorse or promote
 *   products derived from this software without specific prior written
 *   permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package com.emc.util;

import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;

public final class HttpUtil {
    private static final String HEADER_FORMAT = "EEE, d MMM yyyy HH:mm:ss z";
    private static final ThreadLocal headerFormat = new ThreadLocal();

    public static synchronized String headerFormat( Date date ) {
        return getHeaderFormat().format( date );
    }

    public static String encodeUtf8( String value ) {
        // Use %20, not +
        try {
            return URLEncoder.encode( value, "UTF-8" ).replace( "+", "%20" );
        } catch ( UnsupportedEncodingException e ) {
            throw new RuntimeException( "UTF-8 encoding isn't supported on this system", e ); // unrecoverable
        }
    }

    public static String decodeUtf8( String value ) {
        try {
            // don't want '+' decoded to a space
            return URLDecoder.decode( value.replace( "+", "%2B" ), "UTF-8" );
        } catch ( UnsupportedEncodingException e ) {
            throw new RuntimeException( "UTF-8 encoding isn't supported on this system", e ); // unrecoverable
        }
    }

    private static DateFormat getHeaderFormat() {
        DateFormat format = headerFormat.get();
        if ( format == null ) {
            format = new SimpleDateFormat( HEADER_FORMAT, Locale.ENGLISH );
            format.setTimeZone( TimeZone.getTimeZone( "UTC" ) );
            headerFormat.set( format );
        }
        return format;
    }
}