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1 package alice.jungle.persistence;
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2
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3 import java.nio.ByteBuffer;
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4
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5 import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.JungleTreeEditor;
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6 import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.Command;
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7 import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.impl.DefaultNodePath;
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8 import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.impl.logger.TreeOperationLog;
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9 import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.operations.NodeOperation;
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10 import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.operations.TreeOperation;
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11 import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.util.Either;
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12 import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.util.Error;
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13
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14 public class JungleUpdater {
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15
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16 public JungleUpdater() {
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17
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18 }
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19
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20 public static Either<Error, JungleTreeEditor> edit(JungleTreeEditor _editor ,TreeOperationLog _log) {
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21 JungleTreeEditor editor = _editor;
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22 Either<Error, JungleTreeEditor> either = null;
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23 for (TreeOperation op : _log) {
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24 either = _edit(editor, op);
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25 if(either.isA()) {
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26 return either;
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27 }
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28 editor = either.b();
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29 }
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30 return either;
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31 }
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32
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33 private static Either<Error, JungleTreeEditor> _edit(JungleTreeEditor editor,
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34 TreeOperation op) {
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35 DefaultNodePath path = new DefaultNodePath();
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36 NodeOperation nodeOp = op.getNodeOperation();
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37 int pos = nodeOp.getPosition();
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38 Command c = nodeOp.getCommand();
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39 String key = "";
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40 switch (c) {
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41 case PUT_ATTRIBUTE:
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42 key = nodeOp.getKey();
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43 ByteBuffer value = nodeOp.getValue();
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44 return editor.putAttribute(path, key, value);
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45 case DELETE_ATTRIBUTE:
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46 key = nodeOp.getKey();
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47 return editor.deleteAttribute(path, key);
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48 case APPEND_CHILD:
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49 return editor.addNewChildAt(path, pos);
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50 case DELETE_CHILD:
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51 return editor.deleteChildAt(path, 0);
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52 }
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53 return null;
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54 }
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55
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56
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57
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58 }
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