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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2010-2011 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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 * only the GPL Version 2, indicate your decision by adding "[Contributor]
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 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
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package org.glassfish.grizzly.filterchain;

import java.io.IOException;

import org.glassfish.grizzly.Connection;
import org.glassfish.grizzly.TransformationException;
import org.glassfish.grizzly.TransformationResult;
import org.glassfish.grizzly.Transformer;

/**
 *
 * @author Alexey Stashok
 */
public abstract class AbstractCodecFilter extends BaseFilter
        implements CodecFilter {
    private final Transformer decoder;
    private final Transformer encoder;

    public AbstractCodecFilter(Transformer decoder,
            Transformer encoder) {
        this.decoder = decoder;
        this.encoder = encoder;
    }

    @Override
    @SuppressWarnings("unchecked")
    public NextAction handleRead(FilterChainContext ctx) throws IOException {
        final Connection connection = ctx.getConnection();
        final K message = (K) ctx.getMessage();

        final TransformationResult result =
                decoder.transform(connection, message);

        switch(result.getStatus()) {
            case COMPLETE:
                final K remainder = result.getExternalRemainder();
                final boolean hasRemaining =
                        decoder.hasInputRemaining(connection, remainder);
                decoder.release(connection);
                ctx.setMessage(result.getMessage());
                if (hasRemaining) {
                    return ctx.getInvokeAction(remainder);
                } else {
                    return ctx.getInvokeAction();
                }
            case INCOMPLETE:
                return ctx.getStopAction(message);
            case ERROR:
                throw new TransformationException(getClass().getName() +
                        " transformation error: (" + result.getErrorCode() + ") " +
                        result.getErrorDescription());
        }

        return ctx.getInvokeAction();
    }

    @Override
    @SuppressWarnings("unchecked")
    public NextAction handleWrite(FilterChainContext ctx) throws IOException {
        final Connection connection = ctx.getConnection();
        final L message = (L) ctx.getMessage();

        final TransformationResult result = encoder.transform(connection, message);

        switch(result.getStatus()) {
            case COMPLETE:
                ctx.setMessage(result.getMessage());
                final L remainder = result.getExternalRemainder();
                final boolean hasRemaining =
                        encoder.hasInputRemaining(connection, remainder);
                encoder.release(connection);
                if (hasRemaining) {
                    return ctx.getInvokeAction(remainder);
                } else {
                    return ctx.getInvokeAction();
                }
            case INCOMPLETE:
                return ctx.getStopAction(message);
            case ERROR:
                throw new TransformationException(getClass().getName() +
                        " transformation error: (" + result.getErrorCode() + ") " +
                        result.getErrorDescription());
        }

        return ctx.getInvokeAction();
    }


    @Override
    public Transformer getDecoder() {
        return decoder;
    }

    @Override
    public Transformer getEncoder() {
        return encoder;
    }
}