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Refactors null object pattern to java-11

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This commit is contained in:
Anurag Agarwal 2020-08-08 00:46:08 +00:00
parent a5038c4329
commit 8e060ad0ad
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GPG Key ID: CF5E14552DA23F13
4 changed files with 35 additions and 36 deletions
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16
null-object/src/main/java/com/iluwatar/nullobject/App.java
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@ -37,12 +37,16 @@ public class App {
* @param args command line args * @param args command line args
*/ */
public static void main(String[] args) { public static void main(String[] args) {
Node root = new NodeImpl("1",
Node root = new NodeImpl("11",
new NodeImpl("1", new NodeImpl("11", new NodeImpl("111", NullNode.getInstance(), new NodeImpl("111", NullNode.getInstance(), NullNode.getInstance()),
NullNode.getInstance()), NullNode.getInstance()), new NodeImpl("12", NullNode.getInstance()
NullNode.getInstance(), new NodeImpl("122", NullNode.getInstance(), ),
NullNode.getInstance()))); new NodeImpl("12",
NullNode.getInstance(),
new NodeImpl("122", NullNode.getInstance(), NullNode.getInstance())
)
);
root.walk(); root.walk();
} }

6
null-object/src/test/java/com/iluwatar/nullobject/AppTest.java
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@ -26,15 +26,11 @@ package com.iluwatar.nullobject;
import org.junit.jupiter.api.Test; import org.junit.jupiter.api.Test;
/** /**
*
* Application test * Application test
*
*/ */
public class AppTest { public class AppTest {
@Test @Test
public void test() { public void test() {
String[] args = {}; App.main(new String[]{});
App.main(args);
} }
} }

4
null-object/src/test/java/com/iluwatar/nullobject/NullNodeTest.java
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@ -42,14 +42,14 @@ public class NullNodeTest {
*/ */
@Test @Test
public void testGetInstance() { public void testGetInstance() {
final NullNode instance = NullNode.getInstance(); final var instance = NullNode.getInstance();
assertNotNull(instance); assertNotNull(instance);
assertSame(instance, NullNode.getInstance()); assertSame(instance, NullNode.getInstance());
} }
@Test @Test
public void testFields() { public void testFields() {
final NullNode node = NullNode.getInstance(); final var node = NullNode.getInstance();
assertEquals(0, node.getTreeSize()); assertEquals(0, node.getTreeSize());
assertNull(node.getName()); assertNull(node.getName());
assertNull(node.getLeft()); assertNull(node.getLeft());

45
null-object/src/test/java/com/iluwatar/nullobject/TreeTest.java
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@ -23,22 +23,21 @@
package com.iluwatar.nullobject; package com.iluwatar.nullobject;
import ch.qos.logback.classic.Logger;
import ch.qos.logback.classic.spi.ILoggingEvent;
import ch.qos.logback.core.AppenderBase;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.slf4j.LoggerFactory;
import java.util.LinkedList;
import java.util.List;
import static org.junit.jupiter.api.Assertions.assertEquals; import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull; import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.junit.jupiter.api.Assertions.assertSame; import static org.junit.jupiter.api.Assertions.assertSame;
import static org.junit.jupiter.api.Assertions.assertTrue; import static org.junit.jupiter.api.Assertions.assertTrue;
import ch.qos.logback.classic.Logger;
import ch.qos.logback.classic.spi.ILoggingEvent;
import ch.qos.logback.core.AppenderBase;
import java.util.LinkedList;
import java.util.List;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.slf4j.LoggerFactory;
/** /**
* Date: 12/26/15 - 11:44 PM * Date: 12/26/15 - 11:44 PM
* *
@ -75,12 +74,12 @@ public class TreeTest {
private static final Node TREE_ROOT; private static final Node TREE_ROOT;
static { static {
final NodeImpl level1B = new NodeImpl("level1_b", NullNode.getInstance(), NullNode.getInstance()); final var level1B = new NodeImpl("level1_b", NullNode.getInstance(), NullNode.getInstance());
final NodeImpl level2B = new NodeImpl("level2_b", NullNode.getInstance(), NullNode.getInstance()); final var level2B = new NodeImpl("level2_b", NullNode.getInstance(), NullNode.getInstance());
final NodeImpl level3A = new NodeImpl("level3_a", NullNode.getInstance(), NullNode.getInstance()); final var level3A = new NodeImpl("level3_a", NullNode.getInstance(), NullNode.getInstance());
final NodeImpl level3B = new NodeImpl("level3_b", NullNode.getInstance(), NullNode.getInstance()); final var level3B = new NodeImpl("level3_b", NullNode.getInstance(), NullNode.getInstance());
final NodeImpl level2A = new NodeImpl("level2_a", level3A, level3B); final var level2A = new NodeImpl("level2_a", level3A, level3B);
final NodeImpl level1A = new NodeImpl("level1_a", level2A, level2B); final var level1A = new NodeImpl("level1_a", level2A, level2B);
TREE_ROOT = new NodeImpl("root", level1A, level1B); TREE_ROOT = new NodeImpl("root", level1A, level1B);
} }
@ -112,17 +111,17 @@ public class TreeTest {
@Test @Test
public void testGetLeft() { public void testGetLeft() {
final Node level1 = TREE_ROOT.getLeft(); final var level1 = TREE_ROOT.getLeft();
assertNotNull(level1); assertNotNull(level1);
assertEquals("level1_a", level1.getName()); assertEquals("level1_a", level1.getName());
assertEquals(5, level1.getTreeSize()); assertEquals(5, level1.getTreeSize());
final Node level2 = level1.getLeft(); final var level2 = level1.getLeft();
assertNotNull(level2); assertNotNull(level2);
assertEquals("level2_a", level2.getName()); assertEquals("level2_a", level2.getName());
assertEquals(3, level2.getTreeSize()); assertEquals(3, level2.getTreeSize());
final Node level3 = level2.getLeft(); final var level3 = level2.getLeft();
assertNotNull(level3); assertNotNull(level3);
assertEquals("level3_a", level3.getName()); assertEquals("level3_a", level3.getName());
assertEquals(1, level3.getTreeSize()); assertEquals(1, level3.getTreeSize());
@ -132,7 +131,7 @@ public class TreeTest {
@Test @Test
public void testGetRight() { public void testGetRight() {
final Node level1 = TREE_ROOT.getRight(); final var level1 = TREE_ROOT.getRight();
assertNotNull(level1); assertNotNull(level1);
assertEquals("level1_b", level1.getName()); assertEquals("level1_b", level1.getName());
assertEquals(1, level1.getTreeSize()); assertEquals(1, level1.getTreeSize());
@ -140,7 +139,7 @@ public class TreeTest {
assertSame(NullNode.getInstance(), level1.getLeft()); assertSame(NullNode.getInstance(), level1.getLeft());
} }
private class InMemoryAppender extends AppenderBase<ILoggingEvent> { private static class InMemoryAppender extends AppenderBase<ILoggingEvent> {
private final List<ILoggingEvent> log = new LinkedList<>(); private final List<ILoggingEvent> log = new LinkedList<>();
public InMemoryAppender() { public InMemoryAppender() {
@ -154,7 +153,7 @@ public class TreeTest {
} }
public boolean logContains(String message) { public boolean logContains(String message) {
return log.stream().anyMatch(event -> event.getMessage().equals(message)); return log.stream().map(ILoggingEvent::getMessage).anyMatch(message::equals);
} }
public int getLogSize() { public int getLogSize() {