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 getInput() {
        return input;
    }

    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);
    }

        assertNull(synonymItem.getNewOutputs());
        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]);

        assertFalse(itemList.get(0).isUpdated());

        assertEquals(2, itemList.get(1).getInputs().length);
        assertEquals(1, itemList.get(1).getOutputs().length);
        assertEquals("b1", itemList.get(1).getInputs()[0]);
        assertEquals("b2", itemList.get(1).getInputs()[1]);
        assertEquals("B1", itemList.get(1).getOutputs()[0]);
        assertFalse(itemList.get(1).isUpdated());

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

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

        stemmerOverrideItem.setNewInput("");

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

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

            assertEquals("reading" + (i + 1), kuromojiItem.getReading());
            assertEquals("pos" + (i + 1), kuromojiItem.getPos());
            assertFalse(kuromojiItem.isUpdated());
            assertFalse(kuromojiItem.isUpdated());
        }
    }

    /*
    // TODO
    public void test_insert() {
        final KuromojiFile kuromojiFile = new KuromojiFile(file1);

        }
        return String.join("\n", inputs);
    }

    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 (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 getReading() {
        return reading;
    }

    public String getPos() {
        return pos;
    }

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

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

    @Override
    public int hashCode() {
        return Objects.hash(pos, reading, segmentation, token);
    }