1 package era.mi.logic.components;
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3 import java.util.Arrays;
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4 import java.util.Collections;
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5 import java.util.List;
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7 import era.mi.logic.Bit;
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8 import era.mi.logic.wires.Wire;
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9 import era.mi.logic.wires.Wire.WireEnd;
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10 import era.mi.logic.wires.WireArrayObserver;
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12 public class Merger implements WireArrayObserver, Component
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14 private WireEnd out;
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15 private WireEnd[] inputs;
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16 private int[] beginningIndex;
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20 * @param union The output of merging n {@link Wire}s into one. Must have length = a1.length() + a2.length() + ... + an.length().
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21 * @param inputs The inputs to be merged into the union
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23 public Merger(WireEnd union, WireEnd... inputs)
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25 this.inputs = inputs;
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27 this.beginningIndex = new int[inputs.length];
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30 for (int i = 0; i < inputs.length; i++)
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32 beginningIndex[i] = length;
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33 length += inputs[i].length();
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34 inputs[i].addObserver(this);
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37 if (length != union.length())
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38 throw new IllegalArgumentException(
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39 "The output of merging n WireArrays into one must have length = a1.length() + a2.length() + ... + an.length().");
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42 public WireEnd getInput(int index)
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44 return inputs[index];
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47 public WireEnd getUnion()
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53 public void update(Wire initiator, Bit[] oldValues)
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55 int index = find(initiator);
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56 int beginning = beginningIndex[index];
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57 out.feedSignals(beginning, inputs[index].getValues());
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60 private int find(Wire w)
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62 for (int i = 0; i < inputs.length; i++)
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63 if (inputs[i].getWire() == w)
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68 public WireEnd[] getInputs()
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70 return inputs.clone();
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74 public List<WireEnd> getAllInputs()
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76 return Collections.unmodifiableList(Arrays.asList(inputs));
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80 public List<WireEnd> getAllOutputs()
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82 return Collections.unmodifiableList(Arrays.asList(out));
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