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package org.glassfish.grizzly.http;

import org.glassfish.grizzly.Buffer;
import org.glassfish.grizzly.filterchain.FilterChainContext;

/**
 * Abstraction, which represents HTTP transfer-encoding.
 * The implementation should take care about possible HTTP content fragmentation.
 *
 * @see FixedLengthTransferEncoding
 * @see ChunkedTransferEncoding
 * 
 * @author Alexey Stashok
 */
public interface TransferEncoding {
    /**
     * Return true if this encoding should be used to parse the
     * content of the passed {@link HttpHeader}, or false otherwise.
     * 
     * @param httpPacket {@link HttpHeader}.
     * @return true if this encoding should be used to parse the
     * content of the passed {@link HttpHeader}, or false otherwise.
     */
    boolean wantDecode(HttpHeader httpPacket);

    /**
     * Return true if this encoding should be used to serialize the
     * content of the passed {@link HttpHeader}, or false otherwise.
     *
     * @param httpPacket {@link HttpHeader}.
     * @return true if this encoding should be used to serialize the
     * content of the passed {@link HttpHeader}, or false otherwise.
     */
    boolean wantEncode(HttpHeader httpPacket);

    /**
     * This method will be called by {@link HttpCodecFilter} to let
     * TransferEncoding prepare itself for the content serialization.
     * At this time TransferEncoding is able to change, update HTTP
     * packet headers.
     *
     * @param ctx {@link FilterChainContext}
     * @param httpHeader HTTP packet headers.
     * @param content ready HTTP content (might be null).
     */
    void prepareSerialize(FilterChainContext ctx,
                          HttpHeader httpHeader,
                          HttpContent content);

    /**
     * Parse HTTP packet payload, represented by {@link Buffer} using specific
     * transfer encoding.
     *
     * @param ctx {@link FilterChainContext}
     * @param httpPacket {@link HttpHeader} with parsed headers.
     * @param buffer {@link Buffer} HTTP message payload.
     * @return {@link ParsingResult}
     */
    ParsingResult parsePacket(FilterChainContext ctx,
                              HttpHeader httpPacket, Buffer buffer);

    /**
     * Serialize HTTP packet payload, represented by {@link HttpContent}
     * using specific transfer encoding.
     *
     * @param ctx {@link FilterChainContext}
     * @param httpContent {@link HttpContent} with parsed {@link HttpContent#getHttpHeader()}.
     *
     * @return serialized {@link Buffer}
     */
    Buffer serializePacket(FilterChainContext ctx,
                           HttpContent httpContent);
}