Feature/improve user experience (#9)

Co-authored-by: Ryan Horiguchi <ryan.horiguchi@mimacom.com>
Co-authored-by: Stefan Kapferer <stefan.kapferer@mimacom.com>

Author: 3 people

.github/FUNDING.yml

@@ -1,2 +1 @@
 github: stefan-ka
-

.github/workflows/build_master.yml

@@ -10,7 +10,7 @@ on:
 jobs:
   build_and_publish_snapshot:
     runs-on: ubuntu-18.04
-    
+
     steps:
     - uses: actions/checkout@v2
       with:
@@ -48,4 +48,3 @@ jobs:
         OSSRH_PASSWORD: ${{ secrets.OSSRH_PASSWORD }}
     - name: Upload coverage to Codecov
       uses: codecov/codecov-action@v1
-

.github/workflows/build_standard.yml

@@ -9,7 +9,7 @@ on:
 jobs:
   build:
     runs-on: ubuntu-18.04
-    
+
     steps:
     - uses: actions/checkout@v2
       with:
@@ -20,7 +20,7 @@ jobs:
         java-version: 11
     - name: Install Graphviz
       run: sudo apt-get -y install graphviz
-    - name: Gradle caches  
+    - name: Gradle caches
       uses: actions/cache@v2
       with:
         path: |
@@ -35,4 +35,71 @@ jobs:
       run: ./gradlew clean build snapshot
     - name: Upload coverage to Codecov
       uses: codecov/codecov-action@v1
+    - name: Unpack tar
+      run: mkdir ./out && tar -xf ./build/distributions/*.tar --strip-components 1 -C ./out
+    - name: Upload build
+      uses: actions/upload-artifact@v2
+      with:
+        name: build
+        path: ./out
+        if-no-files-found: error
+
+  validate_java_8:
+    runs-on: ubuntu-18.04
+    needs:
+      - build
 
+    steps:
+      - name: Download build
+        uses: actions/download-artifact@v2
+        with:
+          name: build
+          path: ./out
+      - name: Grant execute permission for cm
+        run: chmod +x ./out/bin/cm
+      - name: Set up JDK 8
+        uses: actions/setup-java@v1
+        with:
+          java-version: 8
+      - name: Execute to check if Java version is compatible
+        run: ./out/bin/cm
+
+  validate_java_11:
+    runs-on: ubuntu-18.04
+    needs:
+      - build
+
+    steps:
+      - name: Download build
+        uses: actions/download-artifact@v2
+        with:
+          name: build
+          path: ./out
+      - name: Grant execute permission for cm
+        run: chmod +x ./out/bin/cm
+      - name: Set up JDK 11
+        uses: actions/setup-java@v1
+        with:
+          java-version: 11
+      - name: Execute to check if Java version is compatible
+        run: ./out/bin/cm
+
+  validate_java_17:
+    runs-on: ubuntu-18.04
+    needs:
+      - build
+
+    steps:
+      - name: Download build
+        uses: actions/download-artifact@v2
+        with:
+          name: build
+          path: ./out
+      - name: Grant execute permission for cm
+        run: chmod +x ./out/bin/cm
+      - name: Set up JDK 17
+        uses: actions/setup-java@v1
+        with:
+          java-version: 17
+      - name: Execute to check if Java version is compatible
+        run: ./out/bin/cm || if [ $? != 1 ]; then exit -1; fi

.github/workflows/release.yml

@@ -8,7 +8,7 @@ on:
 jobs:
   release:
     runs-on: ubuntu-18.04
-    
+
     steps:
     - uses: actions/checkout@v2
       with:
@@ -19,7 +19,7 @@ jobs:
         java-version: 11
     - name: Install Graphviz
       run: sudo apt-get -y install graphviz
-    - name: Gradle caches  
+    - name: Gradle caches
       uses: actions/cache@v2
       with:
         path: |
@@ -46,4 +46,3 @@ jobs:
         OSSRH_PASSWORD: ${{ secrets.OSSRH_PASSWORD }}
     - name: Upload coverage to Codecov
       uses: codecov/codecov-action@v1
-

src/main/java/org/contextmapper/cli/ContextMapperCLI.java

@@ -20,9 +20,12 @@
 import org.contextmapper.cli.commands.ValidateCommand;
 
 import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
 
 public class ContextMapperCLI {
 
+    private static final List<String> REQUIRED_JAVA_VERSIONS = Collections.unmodifiableList(Arrays.asList("1.8", "11"));
     private static final String VALIDATE_COMMAND = "validate";
     private static final String GENERATE_COMMAND = "generate";
 
@@ -35,7 +38,14 @@ public ContextMapperCLI() {
     }
 
     public static void main(String[] args) {
-        new ContextMapperCLI().run(args);
+        String javaVersion = System.getProperty("java.version");
+
+        if (REQUIRED_JAVA_VERSIONS.stream().anyMatch(javaVersion::startsWith)) {
+            new ContextMapperCLI().run(args);
+        } else {
+            System.out.printf("Invalid Java version '%s', please set JAVA_HOME to major version '%s'%n", javaVersion, String.join("' or '", REQUIRED_JAVA_VERSIONS));
+            System.exit(1);
+        }
     }
 
     protected void run(String[] args) {
@@ -47,6 +57,9 @@ protected void run(String[] args) {
             validateCommand.run(Arrays.copyOfRange(args, 1, args.length));
         } else if (GENERATE_COMMAND.equalsIgnoreCase(args[0])) {
             generateCommand.run(Arrays.copyOfRange(args, 1, args.length));
+        } else {
+            System.out.println("Invalid input");
+            System.exit(127);
         }
     }
 

src/main/java/org/contextmapper/cli/commands/GenerateCommand.java

@@ -80,8 +80,8 @@ private Options createOptions() {
         options.addOption(input);
 
         Option generator = new Option("g", "generator", true,
-                "The generator you want to call. Use one of the following values: " + String.join(", ", Arrays
-                        .asList(ContextMapperGenerator.values()).stream().map(g -> g.toString()).collect(Collectors.toList())));
+                "The generator you want to call. Use one of the following values: " +
+                        Arrays.stream(ContextMapperGenerator.values()).map(ContextMapperGenerator::toString).collect(Collectors.joining(", ")));
         generator.setRequired(true);
         options.addOption(generator);