sdis1819-t7g02 / channels / MessageHeader.java @ 1
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package channels; |
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import java.util.ArrayList; |
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import service.Constants; |
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public class MessageHeader { |
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private String messageType; |
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private String version; |
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private String senderId; |
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private String fileId; |
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private String chunkNumber; |
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private String degree; |
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public MessageHeader(byte[] msg, int length) { |
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byte[] header = getHeaderPart(msg, length); |
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String headerString = new String(header); |
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String[] headerElements = headerString.split("\\s+"); |
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if(!analyseHeader(headerElements)) {
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throw new IllegalArgumentException("Minimum header arguments not matched"); |
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} |
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} |
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public MessageHeader(String[] headerComponents) { |
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if(!analyseHeader(headerComponents)) {
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throw new IllegalArgumentException("Minimum header arguments not matched"); |
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} |
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} |
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@Override
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public String toString() { |
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if(messageType.equals(Constants.PUTCHUNK)) {
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return messageType + " " + version + " " + senderId + " " + fileId + " " + chunkNumber + " " + degree; |
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} |
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else {
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return messageType + " " + version + " " + senderId + " " + fileId + " " + chunkNumber; |
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} |
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} |
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public String getMessageType() { |
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return messageType;
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} |
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private void setMessageType(String messageType) { |
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this.messageType = messageType;
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} |
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public String getVersion() { |
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return version;
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} |
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private void setVersion(String version) { |
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this.version = version;
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} |
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public String getSenderId() { |
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return senderId;
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} |
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private boolean setSenderId(String senderId) { |
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try {
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Integer.parseInt(senderId);
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this.senderId = senderId;
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} catch(Exception e) { |
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return false; |
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} |
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return true; |
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} |
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public String getFileId() { |
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return fileId;
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} |
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private void setFileId(String fileId) { |
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this.fileId = fileId;
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} |
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public String getChunkNumber() { |
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return chunkNumber;
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} |
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private void setChunkNumber(String chunkNumber) { |
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this.chunkNumber = chunkNumber;
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} |
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public String getDegree() { |
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if(degree == null) { |
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return "1"; |
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} |
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return degree;
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} |
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private void setDegree(String degree) { |
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this.degree = degree;
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} |
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private byte[] getHeaderPart(byte[] msg, int length) { |
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byte[] headerPart = new byte[length]; |
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for(int i = 0; i < length; i++) { |
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headerPart[i] = msg[i]; |
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} |
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return headerPart;
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} |
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public ArrayList<Byte> toBytes() { |
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ArrayList<Byte> headerBytes = new ArrayList<Byte>(); |
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Byte space = new String(" ").getBytes()[0]; |
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for(Byte b : getMessageType().getBytes()) { |
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headerBytes.add(b); |
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} |
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headerBytes.add(space); |
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for(Byte b : getVersion().getBytes()) { |
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headerBytes.add(b); |
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} |
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headerBytes.add(space); |
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for(Byte b : getSenderId().getBytes()) { |
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headerBytes.add(b); |
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} |
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headerBytes.add(space); |
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for(Byte b : getFileId().getBytes()) { |
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headerBytes.add(b); |
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} |
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headerBytes.add(space); |
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if(!messageType.equals(Constants.DELETE)) {
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for(Byte b : getChunkNumber().getBytes()) { |
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headerBytes.add(b); |
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} |
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} |
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headerBytes.add(space); |
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if(messageType.equals(Constants.PUTCHUNK)) {
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for(Byte b : getDegree().getBytes()) { |
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headerBytes.add(b); |
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} |
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} |
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headerBytes.add(space); |
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headerBytes.add(Constants.CR); |
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headerBytes.add(Constants.LF); |
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headerBytes.add(Constants.CR); |
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headerBytes.add(Constants.LF); |
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return headerBytes;
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} |
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public byte[] headerToBytes() { |
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ArrayList<Byte> headerBytes = toBytes(); |
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byte[] toReturn = new byte[headerBytes.size()]; |
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int i = 0; |
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for(Byte b: headerBytes) { |
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toReturn[i] = b; |
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i++; |
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} |
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return toReturn;
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} |
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private boolean analyseHeader(String[] h) { |
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switch(h[0]) { |
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case Constants.PUTCHUNK:
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if(h.length != Constants.PUTCHUNK_N_ARGS) {
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return false; |
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} |
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setMessageType(h[0]);
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setVersion(h[1]);
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if(!setSenderId(h[2])) { |
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return false; |
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} |
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setFileId(h[3]);
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setChunkNumber(h[4]);
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setDegree(h[5]);
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break;
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case Constants.STORED:
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if(h.length != Constants.STORED_N_ARGS) {
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return false; |
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} |
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setMessageType(h[0]);
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setVersion(h[1]);
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if(!setSenderId(h[2])) { |
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return false; |
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} |
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setFileId(h[3]);
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setChunkNumber(h[4]);
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break;
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case Constants.GETCHUNK:
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if(h.length != Constants.GETCHUNK_N_ARGS) {
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return false; |
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} |
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setMessageType(h[0]);
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setVersion(h[1]);
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if(!setSenderId(h[2])) { |
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return false; |
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} |
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setFileId(h[3]);
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setChunkNumber(h[4]);
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break;
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case Constants.CHUNK:
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if(h.length != Constants.CHUNK_N_ARGS) {
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return false; |
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} |
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setMessageType(h[0]);
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setVersion(h[1]);
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if(!setSenderId(h[2])) { |
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return false; |
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} |
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setFileId(h[3]);
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setChunkNumber(h[4]);
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break;
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case Constants.DELETE:
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if(h.length != Constants.DELETE_N_ARGS) {
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return false; |
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} |
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setMessageType(h[0]);
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setVersion(h[1]);
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if(!setSenderId(h[2])) { |
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return false; |
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} |
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setFileId(h[3]);
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break;
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case Constants.REMOVED:
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if(h.length != Constants.REMOVED_N_ARGS) {
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return false; |
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} |
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setMessageType(h[0]);
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setVersion(h[1]);
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if(!setSenderId(h[2])) { |
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return false; |
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} |
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setFileId(h[3]);
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setChunkNumber(h[4]);
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break;
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default:
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return false; |
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} |
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return true; |
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} |
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} |