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87 lines
2.8 KiB
Java
87 lines
2.8 KiB
Java
package protocolP2P;
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import protocolP2P.Payload;
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import protocolP2P.RequestResponseCode;
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import localException.ProtocolError;
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import localException.InternalError;
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import localException.SizeError;
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import localException.TransmissionError;
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import tools.BytesArrayTools;
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/** Representation of payload for size response.
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* @author Louis Royer
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* @author Flavien Haas
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* @author JS Auge
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* @version 1.0
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*/
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public class SizeResponse extends Payload {
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private String filename;
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private long totalSize;
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static final private int TOTAL_SIZE_POSITION = PAYLOAD_START_POSITION;
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static final private int FILENAME_POSITION = TOTAL_SIZE_POSITION + 8;
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/** Constructor (typically used by server) with informations about file part to send as parameters.
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* @param filename name of the file
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* @param totalSize size of the file
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* @throws InternalError
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*/
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public SizeResponse(String filename, long totalSize) throws InternalError {
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super(RequestResponseCode.SIZE_RESPONSE);
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/* asserts to help debugging */
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assert totalSize >= 0 : "offset cannot be negative";
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assert filename != null : "filename is required";
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if (filename == null || totalSize < 0) {
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throw new InternalError();
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}
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this.filename = filename;
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this.totalSize = totalSize;
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}
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/** Constructor (typically used by client) with Packet received as parameter.
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* @param packet the full Packet received
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* @throws SizeError
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* @throws InternalError
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* @throws TransmissionError
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*/
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protected SizeResponse(byte[] packet) throws TransmissionError, SizeError, ProtocolError, InternalError {
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super(packet);
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int filenameSize = getPayloadSize(packet) - FILENAME_POSITION + PAYLOAD_START_POSITION;
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totalSize = BytesArrayTools.readLong(packet, TOTAL_SIZE_POSITION);
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filename = BytesArrayTools.readString(packet, FILENAME_POSITION, filenameSize);
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}
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/** Returns a byte[] containing Packet with padding.
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* This Packet is still incomplete and should not be send directly.
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* ProtocolP2PPacket will use this method to generate the complete Packet.
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* @return Packet with padding
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* @throws InternalError
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*/
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protected byte[] toPacket() throws InternalError {
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// compute total size
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int size = FILENAME_POSITION + filename.length();
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byte[] packet = new byte[size]; // java initialize all to zero
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// set request/response code
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packet[RequestResponseCode.RRCODE_POSITION] = requestResponseCode.codeValue;
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// set Payload size
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setPayloadSize(size - PAYLOAD_START_POSITION, packet);
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// write totalSize to Packet
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BytesArrayTools.write(packet, TOTAL_SIZE_POSITION, totalSize);
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// write filename to Packet
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BytesArrayTools.write(packet, filename, FILENAME_POSITION);
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return packet;
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}
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/** filename getter.
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* @return String
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*/
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public String getFilename() {
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return filename;
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}
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/** totalSize getter.
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* @return totalSize
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*/
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public long getTotalSize() {
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return totalSize;
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}
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}
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