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

The Command Pattern in Java - BAEL-1722 (#4048)

Browse Source 
* Initial Commit

* Update pom.xml

* Fix unit tests format

* Fix unit test class name

* Update OpenTextFileOPerationUnitTest.java

* Delete OpenTextFileOPerationUnitTest.java

* Delete OpenTextFileOPerationUnitTest.java

* Add unit test class

* Update TextFileOperationExecutorUnitTest.java

* Update TextFileUnitTest.java
This commit is contained in:
Alejandro Gervasio 2018-05-05 23:41:08 -03:00 committed by KevinGilmore
parent fd76b01251
commit 1e1142b145
11 changed files with 265 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
patterns/behavioral-patterns/pom.xml
View File

@ -19,10 +19,22 @@
<version>4.12</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.hamcrest</groupId>
<artifactId>hamcrest-core</artifactId>
<version>1.3</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>3.8.0</version>
<scope>test</scope>
</dependency>
</dependencies>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
</properties>
</project>

19
patterns/behavioral-patterns/src/main/java/com/baeldung/pattern/command/client/TextFileApplication.java Normal file
View File

@ -0,0 +1,19 @@
package com.baeldung.pattern.command.client;
import com.baeldung.pattern.command.command.OpenTextFileOperation;
import com.baeldung.pattern.command.command.SaveTextFileOperation;
import com.baeldung.pattern.command.command.TextFileOperation;
import com.baeldung.pattern.command.invoker.TextFileOperationExecutor;
import com.baeldung.pattern.command.receiver.TextFile;
public class TextFileApplication {
public static void main(String[] args) {
TextFileOperation openTextFileOperation = new OpenTextFileOperation(new TextFile("file1.txt"));
TextFileOperation saveTextFileOperation = new SaveTextFileOperation(new TextFile("file2.txt"));
TextFileOperationExecutor textFileOperationExecutor = new TextFileOperationExecutor();
System.out.println(textFileOperationExecutor.executeOperation(openTextFileOperation));
System.out.println(textFileOperationExecutor.executeOperation(saveTextFileOperation));
}
}

17
patterns/behavioral-patterns/src/main/java/com/baeldung/pattern/command/command/OpenTextFileOperation.java Normal file
View File

@ -0,0 +1,17 @@
package com.baeldung.pattern.command.command;
import com.baeldung.pattern.command.receiver.TextFile;
public class OpenTextFileOperation implements TextFileOperation {
private final TextFile textFile;
public OpenTextFileOperation(TextFile textFile) {
this.textFile = textFile;
}
@Override
public String execute() {
return textFile.open();
}
}

17
patterns/behavioral-patterns/src/main/java/com/baeldung/pattern/command/command/SaveTextFileOperation.java Normal file
View File

@ -0,0 +1,17 @@
package com.baeldung.pattern.command.command;
import com.baeldung.pattern.command.receiver.TextFile;
public class SaveTextFileOperation implements TextFileOperation {
private final TextFile textFile;
public SaveTextFileOperation(TextFile textFile) {
this.textFile = textFile;
}
@Override
public String execute() {
return textFile.save();
}
}

8
patterns/behavioral-patterns/src/main/java/com/baeldung/pattern/command/command/TextFileOperation.java Normal file
View File

@ -0,0 +1,8 @@
package com.baeldung.pattern.command.command;
@FunctionalInterface
public interface TextFileOperation {
String execute();
}

15
patterns/behavioral-patterns/src/main/java/com/baeldung/pattern/command/invoker/TextFileOperationExecutor.java Normal file
View File

@ -0,0 +1,15 @@
package com.baeldung.pattern.command.invoker;
import com.baeldung.pattern.command.command.TextFileOperation;
import java.util.ArrayList;
import java.util.List;
public class TextFileOperationExecutor {
private final List<TextFileOperation> textFileOperations = new ArrayList<>();
public String executeOperation(TextFileOperation textFileOperation) {
textFileOperations.add(textFileOperation);
return textFileOperation.execute();
}
}

34
patterns/behavioral-patterns/src/main/java/com/baeldung/pattern/command/receiver/TextFile.java Normal file
View File

@ -0,0 +1,34 @@
package com.baeldung.pattern.command.receiver;
public class TextFile {
private final String name;
public TextFile(String name) {
this.name = name;
}
public String open() {
return "Opening file " + name;
}
public String read() {
return "Reading file " + name;
}
public String write() {
return "Writing to file " + name;
}
public String save() {
return "Saving file " + name;
}
public String copy() {
return "Copying file " + name;
}
public String paste() {
return "Pasting file " + name;
}
}

16
patterns/behavioral-patterns/src/test/java/com/baeldung/pattern/command/test/OpenTextFileOperationUnitTest.java Normal file
View File

@ -0,0 +1,16 @@
package com.baeldung.pattern.command.test;
import com.baeldung.pattern.command.command.OpenTextFileOperation;
import com.baeldung.pattern.command.command.TextFileOperation;
import com.baeldung.pattern.command.receiver.TextFile;
import org.junit.Test;
import static org.assertj.core.api.Assertions.*;
public class OpenTextFileOperationUnitTest {
@Test
public void givenOpenTextFileOperationIntance_whenCalledExecuteMethod_thenOneAssertion() {
TextFileOperation openTextFileOperation = new OpenTextFileOperation(new TextFile("file1.txt"));
assertThat(openTextFileOperation.execute()).isEqualTo("Opening file file1.txt");
}
}

16
patterns/behavioral-patterns/src/test/java/com/baeldung/pattern/command/test/SaveTextFileOperationUnitTest.java Normal file
View File

@ -0,0 +1,16 @@
package com.baeldung.pattern.command.test;
import com.baeldung.pattern.command.command.SaveTextFileOperation;
import com.baeldung.pattern.command.command.TextFileOperation;
import com.baeldung.pattern.command.receiver.TextFile;
import org.junit.Test;
import static org.assertj.core.api.Assertions.*;
public class SaveTextFileOperationUnitTest {
@Test
public void givenSaveTextFileOperationIntance_whenCalledExecuteMethod_thenOneAssertion() {
TextFileOperation openTextFileOperation = new SaveTextFileOperation(new TextFile("file1.txt"));
assertThat(openTextFileOperation.execute()).isEqualTo("Saving file file1.txt");
}
}

68
patterns/behavioral-patterns/src/test/java/com/baeldung/pattern/command/test/TextFileOperationExecutorUnitTest.java Normal file
View File

@ -0,0 +1,68 @@
package com.baeldung.pattern.command.test;
import com.baeldung.pattern.command.command.OpenTextFileOperation;
import com.baeldung.pattern.command.command.SaveTextFileOperation;
import com.baeldung.pattern.command.command.TextFileOperation;
import com.baeldung.pattern.command.invoker.TextFileOperationExecutor;
import com.baeldung.pattern.command.receiver.TextFile;
import java.util.function.Function;
import org.junit.Test;
import static org.assertj.core.api.Assertions.*;
import org.junit.BeforeClass;
public class TextFileOperationExecutorUnitTest {
private static TextFileOperationExecutor textFileOperationExecutor;
@BeforeClass
public static void setUpTextFileOperationExecutor() {
textFileOperationExecutor = new TextFileOperationExecutor();
}
@Test
public void givenTextFileOPerationExecutorInstance_whenCalledexecuteOperationWithOpenTextOperation_thenOneAssertion() {
TextFileOperation textFileOperation = new OpenTextFileOperation(new TextFile("file1.txt"));
assertThat(textFileOperationExecutor.executeOperation(textFileOperation)).isEqualTo("Opening file file1.txt");
}
@Test
public void givenTextFileOPerationExecutorInstance_whenCalledexecuteOperationWithSaveTextOperation_thenOneAssertion() {
TextFileOperation textFileOperation = new SaveTextFileOperation(new TextFile("file1.txt"));
assertThat(textFileOperationExecutor.executeOperation(textFileOperation)).isEqualTo("Saving file file1.txt");
}
@Test
public void givenTextFileOperationExecutorInstance_whenCalledexecuteOperationWithTextFileOpenLambda_thenOneAssertion() {
assertThat(textFileOperationExecutor.executeOperation(() -> {return "Opening file file1.txt";})).isEqualTo("Opening file file1.txt");
}
@Test
public void givenTextFileOperationExecutorInstance_whenCalledexecuteOperationWithTextFileSaveLambda_thenOneAssertion() {
assertThat(textFileOperationExecutor.executeOperation(() -> {return "Saving file file1.txt";})).isEqualTo("Saving file file1.txt");
}
@Test
public void givenTextFileOperationExecutorInstance_whenCalledexecuteOperationWithTextFileOpenMethodReferenceOfExistingObject_thenOneAssertion() {
TextFile textFile = new TextFile("file1.txt");
assertThat(textFileOperationExecutor.executeOperation(textFile::open)).isEqualTo("Opening file file1.txt");
}
@Test
public void givenTextFileOperationExecutorInstance_whenCalledexecuteOperationWithTextFileSaveMethodReferenceOfExistingObject_thenOneAssertion() {
TextFile textFile = new TextFile("file1.txt");
assertThat(textFileOperationExecutor.executeOperation(textFile::save)).isEqualTo("Saving file file1.txt");
}
@Test
public void givenOpenTextFileOperationExecuteMethodReference_whenCalledApplyMethod_thenOneAssertion() {
Function<OpenTextFileOperation, String> executeMethodReference = OpenTextFileOperation::execute;
assertThat(executeMethodReference.apply(new OpenTextFileOperation(new TextFile("file1.txt")))).isEqualTo("Opening file file1.txt");
}
@Test
public void givenSaveTextFileOperationExecuteMethodReference_whenCalledApplyMethod_thenOneAssertion() {
Function<SaveTextFileOperation, String> executeMethodReference = SaveTextFileOperation::execute;
assertThat(executeMethodReference.apply(new SaveTextFileOperation(new TextFile("file1.txt")))).isEqualTo("Saving file file1.txt");
}
}

42
patterns/behavioral-patterns/src/test/java/com/baeldung/pattern/command/test/TextFileUnitTest.java Normal file
View File

@ -0,0 +1,42 @@
package com.baeldung.pattern.command.test;
import com.baeldung.pattern.command.receiver.TextFile;
import org.junit.Test;
import static org.assertj.core.api.Assertions.*;
import org.junit.BeforeClass;
public class TextFileUnitTest {
private static TextFile textFile;
@BeforeClass
public static void setUpTextFileInstance() {
textFile = new TextFile("file1.txt");
}
@Test
public void givenTextFileInstance_whenCalledopenMethod_thenOneAssertion() {
assertThat(textFile.open()).isEqualTo("Opening file file1.txt");
}
@Test
public void givenTextFileInstance_whenCalledwriteMethod_thenOneAssertion() {
assertThat(textFile.write()).isEqualTo("Writing to file file1.txt");
}
@Test
public void givenTextFileInstance_whenCalledsaveMethod_thenOneAssertion() {
assertThat(textFile.save()).isEqualTo("Saving file file1.txt");
}
@Test
public void givenTextFileInstance_whenCalledcopyMethod_thenOneAssertion() {
assertThat(textFile.copy()).isEqualTo("Copying file file1.txt");
}
@Test
public void givenTextFileInstance_whenCalledpasteMethod_thenOneAssertion() {
assertThat(textFile.paste()).isEqualTo("Pasting file file1.txt");
}
}