[432] | 1 | package de.ugoe.cs.quest;
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[208] | 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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[433] | 7 | import de.ugoe.cs.quest.eventcore.Event;
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[208] | 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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[351] | 20 |
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| 21 | /**
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| 22 | * <p>
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| 23 | * Private constructor to prevent initializing of the class.
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| 24 | * </p>
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| 25 | */
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| 26 | private SequenceInstanceOf() {
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| 27 |
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| 28 | }
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[208] | 29 |
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| 30 | /**
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| 31 | * <p>
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| 32 | * Checks if an object is of type {@link Collection}<{@link List}<
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| 33 | * {@link Event}<?>>>.
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| 34 | * </p>
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| 35 | *
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| 36 | * @param obj
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| 37 | * object that is checked
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| 38 | * @return true, if the obj is of type {@link Collection}<{@link List}
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| 39 | * < {@link Event}<?>>>; false otherwise
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| 40 | */
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| 41 | public static boolean isCollectionOfSequences(Object obj) {
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| 42 | try {
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| 43 | if (obj instanceof Collection<?>) {
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| 44 | Object listObj = ((Collection<?>) obj).iterator().next();
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| 45 | if (listObj instanceof List<?>) {
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[541] | 46 | if (((List<?>) listObj).iterator().next() instanceof Event) {
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[208] | 47 | return true;
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| 48 | }
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| 49 | }
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| 50 | }
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| 51 | } catch (NoSuchElementException e) {
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| 52 | }
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| 53 | return false;
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| 54 | }
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| 55 |
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| 56 | /**
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| 57 | * <p>
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| 58 | * Checks if an object is of type {@link List}<{@link Event}
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| 59 | * <?>>.
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| 60 | * </p>
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| 61 | *
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| 62 | * @param obj
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| 63 | * object that is checked
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| 64 | * @return true, if obj is of type {@link List}<{@link Event}
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| 65 | * <?>>; false otherwise
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| 66 | */
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| 67 | public static boolean isEventSequence(Object obj) {
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| 68 | try {
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| 69 | if (obj instanceof List<?>) {
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[541] | 70 | if (((List<?>) obj).iterator().next() instanceof Event) {
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[208] | 71 | return true;
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| 72 | }
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| 73 | }
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| 74 | } catch (NoSuchElementException e) {
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| 75 | }
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| 76 | return false;
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| 77 | }
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| 78 |
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| 79 | }
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