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This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and Jakarta Messaging BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * Copyright 2014 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.stomp;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelPipeline;
import io.netty.handler.codec.MessageAggregator;
import io.netty.handler.codec.TooLongFrameException;

/**
 * A {@link ChannelHandler} that aggregates an {@link StompHeadersSubframe}
 * and its following {@link StompContentSubframe}s into a single {@link StompFrame}.
 * It is useful when you don't want to take care of STOMP frames whose content is 'chunked'.  Insert this
 * handler after {@link StompSubframeDecoder} in the {@link ChannelPipeline}:
 */
public class StompSubframeAggregator
        extends MessageAggregator {

    /**
     * Creates a new instance.
     *
     * @param maxContentLength
     *        the maximum length of the aggregated content.
     *        If the length of the aggregated content exceeds this value,
     *        a {@link TooLongFrameException} will be raised.
     */
    public StompSubframeAggregator(int maxContentLength) {
        super(maxContentLength);
    }

    @Override
    protected boolean isStartMessage(StompSubframe msg) throws Exception {
        return msg instanceof StompHeadersSubframe;
    }

    @Override
    protected boolean isContentMessage(StompSubframe msg) throws Exception {
        return msg instanceof StompContentSubframe;
    }

    @Override
    protected boolean isLastContentMessage(StompContentSubframe msg) throws Exception {
        return msg instanceof LastStompContentSubframe;
    }

    @Override
    protected boolean isAggregated(StompSubframe msg) throws Exception {
        return msg instanceof StompFrame;
    }

    @Override
    protected boolean isContentLengthInvalid(StompHeadersSubframe start, int maxContentLength) {
        return (int) Math.min(Integer.MAX_VALUE, start.headers().getLong(StompHeaders.CONTENT_LENGTH, -1)) >
                     maxContentLength;
    }

    @Override
    protected Object newContinueResponse(StompHeadersSubframe start, int maxContentLength, ChannelPipeline pipeline) {
        return null;
    }

    @Override
    protected boolean closeAfterContinueResponse(Object msg) throws Exception {
        throw new UnsupportedOperationException();
    }

    @Override
    protected boolean ignoreContentAfterContinueResponse(Object msg) throws Exception {
        throw new UnsupportedOperationException();
    }

    @Override
    protected StompFrame beginAggregation(StompHeadersSubframe start, ByteBuf content) throws Exception {
        StompFrame ret = new DefaultStompFrame(start.command(), content);
        ret.headers().set(start.headers());
        return ret;
    }
}