#305 Provide SpringBootDefaultPropertiesFinder that returns the default ap…

components/sbm-support-boot/src/main/java/org/springframework/sbm/boot/properties/finder/SpringBootDefaultPropertiesFinder.java

@@ -0,0 +1,20 @@
+package org.springframework.sbm.boot.properties.finder;
+
+import org.openrewrite.properties.tree.Properties;
+import org.springframework.sbm.boot.properties.api.SpringBootApplicationProperties;
+import org.springframework.sbm.project.resource.ProjectResourceSet;
+import org.springframework.sbm.project.resource.filter.ProjectResourceFinder;
+
+import java.util.Optional;
+
+public class SpringBootDefaultPropertiesFinder implements ProjectResourceFinder<Optional<SpringBootApplicationProperties>> {
+
+    @Override
+    public Optional<SpringBootApplicationProperties> apply(ProjectResourceSet projectResourceSet) {
+        return projectResourceSet.stream()
+                .filter(r -> r.getSourceFile() instanceof Properties.File)
+                .map(r -> new SpringBootApplicationProperties(r.getAbsoluteProjectDir(), (Properties.File) r.getSourceFile()))
+                .filter(SpringBootApplicationProperties::isDefaultProperties)
+                .findFirst();
+    }
+}

components/sbm-support-boot/src/test/java/org/springframework/sbm/boot/properties/finder/SpringBootDefaultPropertiesFinderTest.java

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+package org.springframework.sbm.boot.properties.finder;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.sbm.engine.context.ProjectContext;
+import org.springframework.sbm.project.resource.TestProjectContext;
+
+import java.nio.file.Path;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class SpringBootDefaultPropertiesFinderTest {
+
+    @Test
+    public void givenAProjectWithDefaultSpringBootProperties_applyFinder_expectPropertyFile(){
+        ProjectContext projectContext = TestProjectContext.buildProjectContext()
+                .addProjectResource(Path.of("src","main", "resources", "application.properties"), "foo=bar")
+                .build();
+
+        SpringBootDefaultPropertiesFinder springBootDefaultPropertiesFinder = new SpringBootDefaultPropertiesFinder();
+        assertThat(springBootDefaultPropertiesFinder.apply(projectContext.getProjectResources()).isPresent()).isTrue();
+    }
+
+    @Test
+    public void givenAProjectWithoutDefaultSpringBootProperties_applyFinder_expectPropertyFile(){
+        ProjectContext projectContext = TestProjectContext.buildProjectContext()
+                .build();
+
+        SpringBootDefaultPropertiesFinder springBootDefaultPropertiesFinder = new SpringBootDefaultPropertiesFinder();
+        assertThat(springBootDefaultPropertiesFinder.apply(projectContext.getProjectResources()).isEmpty()).isTrue();
+    }
+}