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BAEL-1072 Difference between Proxy, Decorator, Adapter, and Bridge Patterns (#2635)

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* Changes as per last review. Changed method names so that they look more idiomatic.

* Updated pattern, changed method names and test cases
This commit is contained in:
ramansahasi
2017-09-18 05:29:23 +05:30
committed by maibin
parent a323d64d75
commit 3a9654370a
21 changed files with 74 additions and 103 deletions
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20
core-java/src/test/java/com/baeldung/designpatterns/AdapterPatternIntegrationTest.java
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@@ -6,15 +6,25 @@ import org.junit.Test;
import com.baeldung.designpatterns.adapter.AstonMartin;
import com.baeldung.designpatterns.adapter.BugattiVeyron;
import com.baeldung.designpatterns.adapter.LuxuryCarsAdapterImpl;
import com.baeldung.designpatterns.adapter.McLaren;
import com.baeldung.designpatterns.adapter.Movable;
import com.baeldung.designpatterns.adapter.MovableAdapter;
import com.baeldung.designpatterns.adapter.MovableAdapterImpl;
public class AdapterPatternIntegrationTest {
@Test
public void givenLuxuryCarsAdapter_WhenConvertingMPHToKMPH_thenSuccessfullyConverted() {
assertEquals(new LuxuryCarsAdapterImpl(new BugattiVeyron()).speedInKMPH(), 431.30312, 0.00001);
assertEquals(new LuxuryCarsAdapterImpl(new McLaren()).speedInKMPH(), 387.85094, 0.00001);
assertEquals(new LuxuryCarsAdapterImpl(new AstonMartin()).speedInKMPH(), 354.0548, 0.00001);
public void givenMovableAdapter_WhenConvertingMPHToKMPH_thenSuccessfullyConverted() {
Movable bugattiVeyron = new BugattiVeyron();
MovableAdapter bugattiVeyronAdapter = new MovableAdapterImpl(bugattiVeyron);
assertEquals(bugattiVeyronAdapter.getSpeed(), 431.30312, 0.00001);
Movable mcLaren = new McLaren();
MovableAdapter mcLarenAdapter = new MovableAdapterImpl(mcLaren);
assertEquals(mcLarenAdapter.getSpeed(), 387.85094, 0.00001);
Movable astonMartin = new AstonMartin();
MovableAdapter astonMartinAdapter = new MovableAdapterImpl(astonMartin);
assertEquals(astonMartinAdapter.getSpeed(), 354.0548, 0.00001);
}
}

34
core-java/src/test/java/com/baeldung/designpatterns/BridgePatternIntegrationTest.java
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@@ -1,14 +1,7 @@
package com.baeldung.designpatterns;
import static com.baeldung.designpatterns.util.LogerUtil.LOG;
import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.*;
import java.util.List;
import org.apache.log4j.spi.LoggingEvent;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import com.baeldung.designpatterns.bridge.Blue;
@@ -18,35 +11,16 @@ import com.baeldung.designpatterns.bridge.Square;
import com.baeldung.designpatterns.bridge.Triangle;
public class BridgePatternIntegrationTest {
public static TestAppenderDP appender;
@Before
public void setUp() {
appender = new TestAppenderDP();
LOG.addAppender(appender);
}
@Test
public void whenBridgePatternInvoked_thenConfigSuccess() {
//a square with red color
Shape square = new Square(new Red());
square.drawShape();
assertEquals(square.draw(), "Square drawn. Color is Red");
//a triangle with blue color
Shape triangle = new Triangle(new Blue());
triangle.drawShape();
final List<LoggingEvent> log = appender.getLog();
assertThat((String) log.get(0).getMessage(), is("Square drawn. "));
assertThat((String) log.get(1).getMessage(), is("Color : Red"));
assertThat((String) log.get(2).getMessage(), is("Triangle drawn. "));
assertThat((String) log.get(3).getMessage(), is("Color : Blue"));
}
@After
public void tearDown() {
LOG.removeAppender(appender);
assertEquals(triangle.draw(), "Triangle drawn. Color is Blue");
}
}

19
core-java/src/test/java/com/baeldung/designpatterns/DecoratorPatternIntegrationTest.java
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@@ -10,19 +10,16 @@ import com.baeldung.designpatterns.decorator.ChristmasTreeImpl;
import com.baeldung.designpatterns.decorator.Garland;
public class DecoratorPatternIntegrationTest {
private ChristmasTree tree;
@Test
public void givenDecoratorPattern_WhenDecoratorsInjectedAtRuntime_thenConfigSuccess() {
//christmas tree with just one Garland
tree = new Garland(new ChristmasTreeImpl());
assertEquals(tree.decorate(), "Christmas tree with Garland");
//christmas tree with two Garlands and one Bubble lights
tree = new BubbleLights(new Garland(
new Garland(new ChristmasTreeImpl()))
);
assertEquals(tree.decorate(), "Christmas tree with Garland with Garland with Bubble Lights");
ChristmasTree tree1 = new Garland(new ChristmasTreeImpl());
assertEquals(tree1.decorate(),
"Christmas tree with Garland");
ChristmasTree tree2 = new BubbleLights(
new Garland(new Garland(new ChristmasTreeImpl())));
assertEquals(tree2.decorate(),
"Christmas tree with Garland with Garland with Bubble Lights");
}
}