assertFalse(stemmerOverrideItem.isUpdated());
        assertFalse(stemmerOverrideItem.isDeleted());

        stemmerOverrideItem.setNewInput("bbb");
        stemmerOverrideItem.setNewOutput("b");
        assertTrue(stemmerOverrideItem.isUpdated());
        assertFalse(stemmerOverrideItem.isDeleted());

        stemmerOverrideItem.setNewInput("");
        stemmerOverrideItem.setNewOutput("");

        assertFalse(synonymItem.isUpdated());
        assertFalse(synonymItem.isDeleted());

        synonymItem.setNewInputs(new String[] { "1", "2" });
        synonymItem.setNewOutputs(new String[] { "3", "4" });
        assertTrue(synonymItem.isUpdated());
        assertFalse(synonymItem.isDeleted());

        synonymItem.setNewInputs(new String[0]);
        synonymItem.setNewOutputs(new String[0]);

        assertFalse(kuromojiItem.isUpdated());
        assertFalse(kuromojiItem.isDeleted());

        kuromojiItem.setNewToken("T1");
        kuromojiItem.setNewSegmentation("S1");
        kuromojiItem.setNewReading("R1");
        kuromojiItem.setNewPos("P1");
        assertTrue(kuromojiItem.isUpdated());
        assertFalse(kuromojiItem.isDeleted());

        kuromojiItem.setNewToken("");

	"fmt"
	"go.etcd.io/etcd/api/v3/mvccpb"
	clientv3 "go.etcd.io/etcd/client/v3"
)

type event struct {
	key              string
	value            []byte
	prevValue        []byte
	rev              int64
	isDeleted        bool
	isCreated        bool
	isProgressNotify bool
	// isInitialEventsEndBookmark helps us keep track
	// of whether we have sent an annotated bookmark event.
	//
	// when this variable is set to true,

					CreateRevision: 1,
					Value:          []byte("value"),
				},
			},
			expectedEvent: &event{
				key:       "key",
				value:     []byte("value"),
				prevValue: nil,
				rev:       1,
				isDeleted: false,
				isCreated: true,
			},
			expectedErr: "",
		},
		{
			name: "unsuccessful delete",
			etcdEvent: &clientv3.Event{
				Type:   mvccpb.DELETE,
				PrevKv: nil,
				Kv: &mvccpb.KeyValue{

        if (input == null) {
            return StringUtil.EMPTY;
        }
        return input;
    }

    public boolean isUpdated() {
        return newInput != null;
    }

    public boolean isDeleted() {
        return isUpdated() && newInput.length() == 0;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        final int result = 1;

    }

    public String getOutput() {
        return output;
    }

    public boolean isUpdated() {
        return newInput != null && newOutput != null;
    }

    public boolean isDeleted() {
        return isUpdated() && StringUtil.isBlank(newInput);
    }

    @Override
    public int hashCode() {
        return Objects.hash(input, output);
    }

    @Override

    }

    public String getOutput() {
        return output;
    }

    public boolean isUpdated() {
        return newInputs != null && newOutput != null;
    }

    public boolean isDeleted() {
        return isUpdated() && newInputs.length == 0;
    }

    public void sort() {
        if (inputs != null) {
            Arrays.sort(inputs);
        }
        if (newInputs != null) {

			for _, f := range n.children {
				if !f.isDeleted() {
					return fmt.Errorf("invalid overlay: path %v is used as both file and directory", from)
				}
			}
		}
		overlay[from] = &node{actualFilePath: to}

		// Add parent directory nodes to overlay structure.
		childNode := overlay[from]
		for {
			dirNode := overlay[dir]
			if dirNode == nil || dirNode.isDeleted() {

        if (input == null) {
            return StringUtil.EMPTY;
        }
        return input;
    }

    public boolean isUpdated() {
        return newInput != null;
    }

    public boolean isDeleted() {
        return isUpdated() && newInput.length() == 0;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        final int result = 1;