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33
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1 package jp.ac.u_ryukyu.ie.cr.shoshi.jungle.persistent;
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2
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81
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3
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63
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4 import java.util.Iterator;
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57
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5
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81
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6
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57
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7
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33
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8 public class NullJournal implements Journal
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9 {
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10 private static final NullChangeListWriter NULL_WRITER = new NullChangeListWriter();
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11 private static final NullChangeListReader NULL_READER = new NullChangeListReader();
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12
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13 @Override
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14 public ChangeListReader getReader()
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15 {
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16 return NULL_READER;
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17 }
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18
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19 @Override
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20 public ChangeListWriter getWriter()
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21 {
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22 return NULL_WRITER;
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23 }
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24
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25 private static class NullChangeListWriter implements ChangeListWriter
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26 {
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27 @Override
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45
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28 public Result write(ChangeList _operations)
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33
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29 {
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57
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30 /*
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31 for(TreeOperation op : _operations){
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32 NodePath p = op.getNodePath();
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33 NodeOperation nodeOp = op.getNodeOperation();
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34 Command c = nodeOp.getCommand();
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35 String args = "";
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36 switch(c){
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37 case PUT_ATTRIBUTE:
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38 String key = nodeOp.getKey();
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39 ByteBuffer value = nodeOp.getValue();
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40 if(value.limit() < 100){
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41 args = String.format("key:%s,value:%s",key,new String(value.array()));
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42 }else{
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43 args = String.format("key:%s,value:%d",key,value.limit());
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44 }
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45 break;
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46 case DELETE_ATTRIBUTE:
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47 args = String.format("key:%s",nodeOp.getKey());
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48 break;
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49 case APPEND_CHILD:
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50 args = String.format("pos:%d",nodeOp.getPosition());
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51 break;
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52 case DELETE_CHILD:
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53 args = String.format("pos:%d",nodeOp.getPosition());
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54 break;
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55 }
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56 System.out.println(String.format("[%s:%s:%s]",c,p,args));
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57 }
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58 */
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33
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59 return Result.SUCCESS;
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60 }
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61 }
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62
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63 private static class NullChangeListReader implements ChangeListReader
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64 {
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65 @Override
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66 public ChangeListReader newReader()
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67 {
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68 return this;
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69 }
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70
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71 @Override
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72 public ChangeList read()
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73 {
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74 return null;
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75 }
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63
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76
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77 @Override
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78 public Iterator<ChangeList> iterator() {
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79 return null;
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80 }
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33
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81 }
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82 }
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