de.kapsi.net.daap.nio.DaapRequestReaderNIO.java Source code

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Here is the source code for de.kapsi.net.daap.nio.DaapRequestReaderNIO.java

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/* 
 * Digital Audio Access Protocol (DAAP)
 * Copyright (C) 2004 Roger Kapsi, info at kapsi dot de
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package de.kapsi.net.daap.nio;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.LinkedList;

import org.apache.commons.httpclient.Header;

import de.kapsi.net.daap.DaapRequest;

/**
 * This class reads bytes from a SocketChannel and 
 * constructs a DaapRequest of the data...
 *
 * @author  Roger Kapsi
 */
public class DaapRequestReaderNIO {

    private long bytesRead = 0;

    private DaapConnectionNIO connection;
    private ByteBuffer in;

    private String requestLine;
    private ArrayList headers;

    private DaapLineReaderNIO lineReader;

    private LinkedList pending;

    /** Creates a new instance of DaapRequestReader */
    public DaapRequestReaderNIO(DaapConnectionNIO connection) {

        this.connection = connection;

        in = ByteBuffer.allocate(1024);
        in.clear();
        in.flip();

        lineReader = new DaapLineReaderNIO(connection.getChannel());
        headers = new ArrayList();
        pending = new LinkedList();
    }

    public long getBytesRead() {
        return bytesRead;
    }

    public DaapRequest read() throws IOException {

        DaapRequest ret = null;

        if (pending.isEmpty() == false)
            ret = (DaapRequest) pending.removeFirst();

        String line = null;

        while ((line = lineReader.read(in)) != null) {

            bytesRead += in.position();

            if (requestLine == null) {
                requestLine = line;

            } else {
                int p = line.indexOf(':');

                if (p == -1) {
                    requestLine = null;
                    headers.clear();
                    lineReader = null;
                    throw new IOException("Malformed Header");
                }

                String name = line.substring(0, p).trim();
                String value = line.substring(++p).trim();
                headers.add(new Header(name, value));
            }
        }

        if (lineReader.isComplete()) {

            DaapRequest request = null;

            try {
                request = new DaapRequest(connection, requestLine);
                request.addHeaders(headers);
            } finally {
                requestLine = null;
                headers.clear();
            }

            if (ret == null) {
                ret = request;
            } else {
                pending.addLast(request);
            }
        }

        return ret;
    }
}