17: Improve ExternalStoragePlugin

src/main/java/com/bartek/esa/core/di/PluginModule.java

@@ -86,8 +86,8 @@ public class PluginModule {
 
     @Provides
     @IntoSet
-    public Plugin externalStoragePlugin(ParentNodeFinder parentNodeFinder) {
+    public Plugin externalStoragePlugin(ParentNodeFinder parentNodeFinder, StaticScopeHelper staticScopeHelper) {
-        return new ExternalStoragePlugin(parentNodeFinder);
+        return new ExternalStoragePlugin(parentNodeFinder, staticScopeHelper);
     }
 
     @Provides

src/main/java/com/bartek/esa/core/helper/NodeUtil.java

@@ -0,0 +1,39 @@
+package com.bartek.esa.core.helper;
+
+import com.github.javaparser.Position;
+import com.github.javaparser.ast.Node;
+
+import static java.lang.String.format;
+
+public class NodeUtil {
+    private Node first;
+
+    private NodeUtil(Node node) {
+        this.first = node;
+    }
+
+    public static NodeUtil is(Node node) {
+        return new NodeUtil(node);
+    }
+
+    public boolean after(Node second) {
+        Position firstPosition = getPosition(first);
+        Position secondPosition = getPosition(second);
+        return firstPosition.isAfter(secondPosition);
+    }
+    
+    private Position getPosition(Node node) {
+        return node.getRange()
+                .map(r -> r.begin)
+                .orElseGet(() -> {
+                    System.err.println(format("Cannot determine position of:\n%s\nProduced results might not be reliable."));
+                    return new Position(0, 0);
+                });
+    }
+
+    public boolean before(Node second) {
+        Position firstPosition = getPosition(first);
+        Position secondPosition = getPosition(second);
+        return firstPosition.isBefore(secondPosition);
+    }
+}

src/main/java/com/bartek/esa/core/helper/StaticScopeHelper.java

@@ -20,6 +20,12 @@ public class StaticScopeHelper {
 
     public Predicate<MethodCallExpr> isFromScope(CompilationUnit compilationUnit, String methodName, String scope, String importScope) {
         return expr -> {
+            if(!expr.getName().getIdentifier().matches(methodName)) {
+                return false;
+            }
+
+            // is called with scope
+            // Class.method()
             boolean isFromScope =  expr.getScope()
                     .filter(Expression::isNameExpr)
                     .map(Expression::asNameExpr)
@@ -28,6 +34,9 @@ public class StaticScopeHelper {
                     .map(s -> s.equals(scope))
                     .orElse(false);
 
+            // is from static import
+            // import static a.b.Class.method
+            // method()
             if(!isFromScope) {
                 isFromScope = compilationUnit.findAll(ImportDeclaration.class).stream()
                         .filter(ImportDeclaration::isStatic)
@@ -39,6 +48,9 @@ public class StaticScopeHelper {
                         .anyMatch(q -> q.equals(format("%s.%s", importScope, scope)));
             }
 
+            // is from import
+            // import static a.b.Class.*
+            // method()
             if(!isFromScope) {
                 isFromScope = compilationUnit.findAll(ImportDeclaration.class).stream()
                         .filter(ImportDeclaration::isStatic)

src/main/java/com/bartek/esa/core/plugin/ExternalStoragePlugin.java

@@ -3,6 +3,7 @@ package com.bartek.esa.core.plugin;
 import com.bartek.esa.context.model.Source;
 import com.bartek.esa.core.archetype.JavaPlugin;
 import com.bartek.esa.core.helper.ParentNodeFinder;
+import com.bartek.esa.core.helper.StaticScopeHelper;
 import com.bartek.esa.core.model.enumeration.Severity;
 import com.github.javaparser.ast.CompilationUnit;
 import com.github.javaparser.ast.body.MethodDeclaration;
@@ -11,18 +12,22 @@ import com.github.javaparser.ast.expr.MethodCallExpr;
 import javax.inject.Inject;
 import java.util.function.Consumer;
 
+import static com.bartek.esa.core.helper.NodeUtil.is;
+
 public class ExternalStoragePlugin extends JavaPlugin {
     private final ParentNodeFinder parentNodeFinder;
+    private final StaticScopeHelper staticScopeHelper;
 
     @Inject
-    public ExternalStoragePlugin(ParentNodeFinder parentNodeFinder) {
+    public ExternalStoragePlugin(ParentNodeFinder parentNodeFinder, StaticScopeHelper staticScopeHelper) {
         this.parentNodeFinder = parentNodeFinder;
+        this.staticScopeHelper = staticScopeHelper;
     }
 
     @Override
     public void run(Source<CompilationUnit> java) {
         java.getModel().findAll(MethodCallExpr.class).stream()
-                .filter(expr -> expr.getName().getIdentifier().matches("getExternalStorageDirectory|getExternalStoragePublicDirectory"))
+                .filter(staticScopeHelper.isFromScope(java.getModel(), "getExternalStorageDirectory|getExternalStoragePublicDirectory", "Environment", "android.os"))
                 .forEach(findCheckingStorageStateForAccessingExternalStorage(java));
     }
 
@@ -36,7 +41,8 @@ public class ExternalStoragePlugin extends JavaPlugin {
 
     private void findCheckingStorageStateInMethodDeclaration(Source<CompilationUnit> java, MethodCallExpr accessingToExternalStorage, MethodDeclaration methodDeclaration) {
         boolean isStateBeingChecked = methodDeclaration.findAll(MethodCallExpr.class).stream()
-                .anyMatch(e -> e.getName().getIdentifier().equals("getExternalStorageState"));
+                .filter(staticScopeHelper.isFromScope(java.getModel(), "getExternalStorageState", "Environment", "android.os"))
+                .anyMatch(checkingMethod -> is(accessingToExternalStorage).after(checkingMethod));
 
         if (!isStateBeingChecked) {
             addJavaIssue(Severity.WARNING, java.getFile(), accessingToExternalStorage);