org.zodiac.netty.http.headers.PragmaHeader Maven / Gradle / Ivy

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package org.zodiac.netty.http.headers;

import org.zodiac.commons.http.entities.CacheControl;
import org.zodiac.commons.http.entities.CacheControlTypes;

import io.netty.util.AsciiString;

/**
 * Handles the HTTP 1.0 Pragma: no-cache header style.
 *
 */
final class PragmaHeader extends AbstractHeader {

    static final AsciiString PRAGMA = AsciiString.cached("pragma");
    private static final AsciiString NO_CACHE = AsciiString.cached("no-cache");
    private static final CacheControl RESP = CacheControl.$(CacheControlTypes.no_cache);

    PragmaHeader() {
        super(CacheControl.class, PRAGMA);
    }

    @Override
    public CacheControl toValue(CharSequence value) {
        if (NO_CACHE.contentEqualsIgnoreCase(value)) {
            return RESP;
        }
        return null;
    }

}