iSharkFly-Docs/java-tutorials
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

BAEL-4848 Update "Java Adapter Pattern" article (#13624)

Browse Source
This commit is contained in:
Eugene Kovko 2023-03-13 03:43:43 +01:00 committed by GitHub
parent f0f9e25e83
commit 1db057ebc8
11 changed files with 87 additions and 98 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
patterns-modules/design-patterns-structural/src/main/java/com/baeldung/adapter/AdapterPatternDriver.java
View File

@ -1,20 +0,0 @@
package com.baeldung.adapter;
import static com.baeldung.util.LoggerUtil.LOG;
public class AdapterPatternDriver {
public static void main(String args[]) {
Movable bugattiVeyron = new BugattiVeyron();
MovableAdapter bugattiVeyronAdapter = new MovableAdapterImpl(bugattiVeyron);
LOG.info("Bugatti Veyron Super Sport's top speed is " + bugattiVeyronAdapter.getSpeed() + " Kmph.");
Movable mcLaren = new McLaren();
MovableAdapter mcLarenAdapter = new MovableAdapterImpl(mcLaren);
LOG.info("McLaren F1 top speed is " + mcLarenAdapter.getSpeed() + " Kmph.");
Movable astonMartin = new AstonMartin();
MovableAdapter astonMartinAdapter = new MovableAdapterImpl(astonMartin);
LOG.info("McLaren F1 top speed is " + astonMartinAdapter.getSpeed() + " Kmph.");
}
}

8
patterns-modules/design-patterns-structural/src/main/java/com/baeldung/adapter/AstonMartin.java
View File

@ -1,8 +0,0 @@
package com.baeldung.adapter;
public class AstonMartin implements Movable {
@Override
public double getSpeed() {
return 220;
}
}

8
patterns-modules/design-patterns-structural/src/main/java/com/baeldung/adapter/BugattiVeyron.java
View File

@ -1,8 +0,0 @@
package com.baeldung.adapter;
public class BugattiVeyron implements Movable {
@Override
public double getSpeed() {
return 268;
}
}

24
patterns-modules/design-patterns-structural/src/main/java/com/baeldung/adapter/IteratorAdapter.java Normal file
View File

@ -0,0 +1,24 @@
package com.baeldung.adapter;
import java.util.Enumeration;
import java.util.Iterator;
public class IteratorAdapter<E> implements Iterator<E> {
private Enumeration<E> enumeration;
public IteratorAdapter(Enumeration<E> enumeration) {
this.enumeration = enumeration;
}
@Override
public boolean hasNext() {
return enumeration.hasMoreElements();
}
@Override
public E next() {
return enumeration.nextElement();
}
}

8
patterns-modules/design-patterns-structural/src/main/java/com/baeldung/adapter/McLaren.java
View File

@ -1,8 +0,0 @@
package com.baeldung.adapter;
public class McLaren implements Movable {
@Override
public double getSpeed() {
return 241;
}
}

6
patterns-modules/design-patterns-structural/src/main/java/com/baeldung/adapter/Movable.java
View File

@ -1,6 +0,0 @@
package com.baeldung.adapter;
public interface Movable {
// returns speed in MPH
double getSpeed();
}

6
patterns-modules/design-patterns-structural/src/main/java/com/baeldung/adapter/MovableAdapter.java
View File

@ -1,6 +0,0 @@
package com.baeldung.adapter;
public interface MovableAdapter {
// returns speed in KMPH
double getSpeed();
}

19
patterns-modules/design-patterns-structural/src/main/java/com/baeldung/adapter/MovableAdapterImpl.java
View File

@ -1,19 +0,0 @@
package com.baeldung.adapter;
public class MovableAdapterImpl implements MovableAdapter {
private Movable luxuryCars;
public MovableAdapterImpl(Movable luxuryCars) {
this.luxuryCars = luxuryCars;
}
@Override
public double getSpeed() {
double mph = luxuryCars.getSpeed();
return convertMPHtoKMPH(mph);
}
private double convertMPHtoKMPH(double mph) {
return mph * 1.60934;
}
}

29
patterns-modules/design-patterns-structural/src/main/java/com/baeldung/adapter/StringTokenizerIteratorAdapter.java Normal file
View File

@ -0,0 +1,29 @@
package com.baeldung.adapter;
import java.util.Iterator;
import java.util.StringTokenizer;
public class StringTokenizerIteratorAdapter extends StringTokenizer implements Iterator<String> {
public StringTokenizerIteratorAdapter(final String str, final String delim, final boolean returnDelims) {
super(str, delim, returnDelims);
}
public StringTokenizerIteratorAdapter(final String str, final String delim) {
super(str, delim);
}
public StringTokenizerIteratorAdapter(final String str) {
super(str);
}
@Override
public boolean hasNext() {
return hasMoreTokens();
}
@Override
public String next() {
return nextToken();
}
}

23
patterns-modules/design-patterns-structural/src/test/java/com/baeldung/adapter/AdapterPatternIntegrationTest.java
View File

@ -1,23 +0,0 @@
package com.baeldung.adapter;
import static org.junit.Assert.assertEquals;
import org.junit.Test;
public class AdapterPatternIntegrationTest {
@Test
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
patterns-modules/design-patterns-structural/src/test/java/com/baeldung/adapter/IteratorAdapterUnitTest.java Normal file
View File

@ -0,0 +1,34 @@
package com.baeldung.adapter;
import static org.junit.Assert.assertEquals;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.StringTokenizer;
import org.junit.jupiter.api.Test;
class IteratorAdapterUnitTest {
public static final String STRING_DATA = "Welcome to baeldung.com";
private final StringTokenizer tokenizer = new StringTokenizer(STRING_DATA);
private final Iterator<String> tokenizerAdapter = new StringTokenizerIteratorAdapter(STRING_DATA);
private final List<String> expectedTokensForString = Arrays.asList("Welcome", "to", "baeldung.com");
@Test
void givenTokenizer_thenAdapterProducesCorrectResult() {
List<String> actualTokens = new ArrayList<>();
new IteratorAdapter(tokenizer).forEachRemaining(s -> actualTokens.add((String) s));
assertEquals(expectedTokensForString, actualTokens);
}
@Test
void givenTokenizerAdapter_thenIteratorProducesCorrectResult() {
List<String> actualTokens = new ArrayList<>();
tokenizerAdapter.forEachRemaining(actualTokens::add);
assertEquals(expectedTokensForString, actualTokens);
}
}