1 | package de.ugoe.cs.eventbench;
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2 |
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3 | import java.util.Collection;
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4 | import java.util.List;
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5 | import java.util.NoSuchElementException;
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6 |
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7 | import de.ugoe.cs.eventbench.data.Event;
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8 |
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9 | /**
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10 | * <p>
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11 | * Helper class that can be used to determine if an object is a sequence or a
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12 | * collection of sequences. {@code instanceof} does not work, because of
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13 | * the type erasure of generics.
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14 | * </p>
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15 | *
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16 | * @author Steffen Herbold
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17 | * @version 1.0
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18 | */
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19 | public class SequenceInstanceOf {
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20 |
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21 | /**
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22 | * <p>
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23 | * Checks if an object is of type {@link Collection}<{@link List}<
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24 | * {@link Event}<?>>>.
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25 | * </p>
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26 | *
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27 | * @param obj
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28 | * object that is checked
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29 | * @return true, if the obj is of type {@link Collection}<{@link List}
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30 | * < {@link Event}<?>>>; false otherwise
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31 | */
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32 | public static boolean isCollectionOfSequences(Object obj) {
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33 | try {
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34 | if (obj instanceof Collection<?>) {
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35 | Object listObj = ((Collection<?>) obj).iterator().next();
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36 | if (listObj instanceof List<?>) {
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37 | if (((List<?>) listObj).iterator().next() instanceof Event<?>) {
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38 | return true;
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39 | }
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40 | }
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41 | }
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42 | } catch (NoSuchElementException e) {
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43 | }
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44 | return false;
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45 | }
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46 |
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47 | /**
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48 | * <p>
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49 | * Checks if an object is of type {@link List}<{@link Event}
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50 | * <?>>.
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51 | * </p>
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52 | *
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53 | * @param obj
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54 | * object that is checked
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55 | * @return true, if obj is of type {@link List}<{@link Event}
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56 | * <?>>; false otherwise
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57 | */
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58 | public static boolean isEventSequence(Object obj) {
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59 | try {
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60 | if (obj instanceof List<?>) {
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61 | if (((List<?>) obj).iterator().next() instanceof Event<?>) {
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62 | return true;
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63 | }
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64 | }
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65 | } catch (NoSuchElementException e) {
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66 | }
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67 | return false;
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68 | }
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69 |
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70 | }
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