5: Create PluginExecutor

src/main/java/com/bartek/esa/core/executor/PluginExecutor.java

@@ -0,0 +1,35 @@
+package com.bartek.esa.core.executor;
+
+import com.bartek.esa.core.archetype.BasePlugin;
+import com.bartek.esa.core.model.Issue;
+
+import javax.inject.Inject;
+import java.io.File;
+import java.util.List;
+
+import static java.util.stream.Collectors.toList;
+
+public class PluginExecutor {
+
+    @Inject
+    public PluginExecutor() {
+
+    }
+
+    public List<Issue> executeForFiles(List<File> files, List<BasePlugin> plugins) {
+        return files.stream()
+                .map(file -> executeForFile(file, plugins))
+                .flatMap(List::stream)
+                .collect(toList());
+    }
+
+    private List<Issue> executeForFile(File file, List<BasePlugin> plugins) {
+        return plugins.stream()
+                .map(plugin -> {
+                    plugin.update(file);
+                    return plugin.runForIssues();
+                })
+                .flatMap(List::stream)
+                .collect(toList());
+    }
+}