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The Netty project is an effort to provide an asynchronous event-driven network application framework and tools for rapid development of maintainable high performance and high scalability protocol servers and clients. In other words, Netty is a NIO client server framework which enables quick and easy development of network applications such as protocol servers and clients. It greatly simplifies and streamlines network programming such as TCP and UDP socket server.

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/*
 * Copyright 2012 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 org.jboss.netty.handler.codec.http;

import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.util.internal.StringUtil;

import java.util.List;
import java.util.Map;
import java.util.Set;

/**
 * The default {@link HttpChunkTrailer} implementation.
 */
public class DefaultHttpChunkTrailer implements HttpChunkTrailer {

    private final HttpHeaders trailingHeaders = new TrailingHeaders(true);

    public boolean isLast() {
        return true;
    }

    public ChannelBuffer getContent() {
        return ChannelBuffers.EMPTY_BUFFER;
    }

    public void setContent(ChannelBuffer content) {
        throw new IllegalStateException("read-only");
    }

    public HttpHeaders trailingHeaders() {
        return trailingHeaders;
    }

    @Override
    public String toString() {
        StringBuilder buf = new StringBuilder(super.toString());
        buf.append(StringUtil.NEWLINE);
        appendHeaders(buf);

        // Remove the last newline.
        buf.setLength(buf.length() - StringUtil.NEWLINE.length());
        return buf.toString();
    }

    private void appendHeaders(StringBuilder buf) {
        for (Map.Entry e: trailingHeaders()) {
            buf.append(e.getKey());
            buf.append(": ");
            buf.append(e.getValue());
            buf.append(StringUtil.NEWLINE);
        }
    }

    private static final class TrailingHeaders extends DefaultHttpHeaders {

        TrailingHeaders(boolean validateHeaders) {
            super(validateHeaders);
        }

        @Override
        public HttpHeaders add(String name, Object value) {
            if (validate) {
                validateName(name);
            }
            return super.add(name, value);
        }

        @Override
        public HttpHeaders add(String name, Iterable values) {
            if (validate) {
                validateName(name);
            }
            return super.add(name, values);
        }

        @Override
        public HttpHeaders set(String name, Iterable values) {
            if (validate) {
                validateName(name);
            }
            return super.set(name, values);
        }

        @Override
        public HttpHeaders set(String name, Object value) {
            if (validate) {
                validateName(name);
            }
            return super.set(name, value);
        }

        private static void validateName(String name) {
            if (name.equalsIgnoreCase(HttpHeaders.Names.CONTENT_LENGTH) ||
                    name.equalsIgnoreCase(HttpHeaders.Names.TRANSFER_ENCODING) ||
                    name.equalsIgnoreCase(HttpHeaders.Names.TRAILER)) {
                throw new IllegalArgumentException(
                        "prohibited trailing header: " + name);
            }
        }
    }
}