Include/exclude project properties

pom.xml

@@ -28,7 +28,7 @@
   </parent>
 
   <artifactId>properties-maven-plugin</artifactId>
-  <version>1.2.2-SNAPSHOT</version>
+  <version>1.3.0-SNAPSHOT</version>
 
   <packaging>maven-plugin</packaging>
 

src/main/java/org/codehaus/mojo/properties/AbstractWritePropertiesMojo.java

@@ -92,4 +92,20 @@ protected void validateOutputFile() throws MojoExecutionException {
     public MavenProject getProject() {
         return project;
     }
+
+    /**
+     * Default scope for test access.
+     *
+     * @param project The test project.
+     */
+    void setProject(MavenProject project) {
+        this.project = project;
+    }
+
+    /**
+     * Default scope for test access.
+     */
+    void setOutputFile(File outputFile) {
+        this.outputFile = outputFile;
+    }
 }

src/main/java/org/codehaus/mojo/properties/WriteProjectProperties.java

@@ -21,13 +21,17 @@
 
 import javax.inject.Inject;
 
+import java.util.Collections;
 import java.util.Enumeration;
 import java.util.List;
+import java.util.Optional;
 import java.util.Properties;
+import java.util.Set;
 
 import org.apache.maven.plugin.MojoExecutionException;
 import org.apache.maven.plugins.annotations.LifecyclePhase;
 import org.apache.maven.plugins.annotations.Mojo;
+import org.apache.maven.plugins.annotations.Parameter;
 import org.codehaus.mojo.properties.managers.PropertiesManager;
 
 /**
@@ -40,6 +44,20 @@
 @Mojo(name = "write-project-properties", defaultPhase = LifecyclePhase.NONE, threadSafe = true)
 public class WriteProjectProperties extends AbstractWritePropertiesMojo {
 
+    /**
+     * Property keys to exclude.
+     * @since 1.3.0
+     */
+    @Parameter(property = "properties.excludedPropertyKeys")
+    private Set<String> excludedPropertyKeys;
+
+    /**
+     * Property keys to include.
+     * @since 1.3.0
+     */
+    @Parameter(property = "properties.includedPropertyKeys")
+    private Set<String> includedPropertyKeys;
+
     /**
      * Default constructor
      *
@@ -68,6 +86,28 @@ public void execute() throws MojoExecutionException {
             }
         }
 
+        Optional.ofNullable(excludedPropertyKeys)
+                .orElseGet(Collections::emptySet)
+                .forEach(projProperties::remove);
+
+        if (includedPropertyKeys != null && !includedPropertyKeys.isEmpty()) {
+            projProperties.keySet().removeIf(key -> !includedPropertyKeys.contains(String.valueOf(key)));
+        }
+
         writeProperties(projProperties);
     }
+
+    /**
+     * Default scope for test access.
+     */
+    void setExcludedPropertyKeys(Set<String> excludedPropertyKeys) {
+        this.excludedPropertyKeys = excludedPropertyKeys;
+    }
+
+    /**
+     * Default scope for test access.
+     */
+    void setIncludedPropertyKeys(Set<String> includedPropertyKeys) {
+        this.includedPropertyKeys = includedPropertyKeys;
+    }
 }

src/test/java/org/codehaus/mojo/properties/WritePropertiesMojoTest.java

@@ -0,0 +1,90 @@
+package org.codehaus.mojo.properties;
+
+import java.io.File;
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.Collections;
+import java.util.Properties;
+import java.util.UUID;
+
+import org.apache.maven.project.MavenProject;
+import org.codehaus.mojo.properties.managers.JdkPropertiesManager;
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.TemporaryFolder;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+
+public class WritePropertiesMojoTest {
+
+    @Rule
+    public TemporaryFolder temporaryFolder = new TemporaryFolder();
+
+    private MavenProject projectStub;
+    private WriteProjectProperties writeProjectProperties;
+    private File outputFile;
+
+    @Before
+    public void setUp() throws IOException {
+        projectStub = new MavenProject();
+        writeProjectProperties = new WriteProjectProperties(Collections.singletonList(new JdkPropertiesManager()));
+        writeProjectProperties.setProject(projectStub);
+        outputFile = temporaryFolder.newFile();
+        writeProjectProperties.setOutputFile(outputFile);
+    }
+
+    @Test
+    public void projectPropertiesAreWritten() throws Exception {
+        String propertyKey = UUID.randomUUID().toString();
+        projectStub.getProperties().put(propertyKey, "foo");
+
+        writeProjectProperties.execute();
+
+        try (FileReader fr = new FileReader(outputFile)) {
+            Properties writtenProperties = new Properties();
+            writtenProperties.load(fr);
+
+            assertEquals("foo", writtenProperties.getProperty(propertyKey));
+        }
+    }
+
+    @Test
+    public void onlyIncludedPropertiesAreWritten() throws Exception {
+        String includedKey = UUID.randomUUID().toString();
+        projectStub.getProperties().put(includedKey, "foo");
+        String excludedKey = UUID.randomUUID().toString();
+        projectStub.getProperties().put(excludedKey, "foo");
+
+        writeProjectProperties.setIncludedPropertyKeys(Collections.singleton(includedKey));
+        writeProjectProperties.execute();
+
+        try (FileReader fr = new FileReader(outputFile)) {
+            Properties writtenProperties = new Properties();
+            writtenProperties.load(fr);
+
+            assertEquals("foo", writtenProperties.getProperty(includedKey));
+            assertFalse(writtenProperties.contains(excludedKey));
+        }
+    }
+
+    @Test
+    public void onlyNonExcludedPropertiesAreWritten() throws Exception {
+        String includedKey = UUID.randomUUID().toString();
+        projectStub.getProperties().put(includedKey, "foo");
+        String excludedKey = UUID.randomUUID().toString();
+        projectStub.getProperties().put(excludedKey, "foo");
+
+        writeProjectProperties.setExcludedPropertyKeys(Collections.singleton(excludedKey));
+        writeProjectProperties.execute();
+
+        try (FileReader fr = new FileReader(outputFile)) {
+            Properties writtenProperties = new Properties();
+            writtenProperties.load(fr);
+
+            assertEquals("foo", writtenProperties.getProperty(includedKey));
+            assertFalse(writtenProperties.contains(excludedKey));
+        }
+    }
+}