Merge pull request #665 from bohdan-harniuk/bugfix/663-fix-null-pointer-exception-for-plugin-reference-provider

[4.1.1-develop] Bug-663: Fixed NullPointerException for PluginReferenceProvider

Author: eduard13

src/com/magento/idea/magento2plugin/reference/provider/PluginReferenceProvider.java

@@ -1,4 +1,4 @@
-/**
+/*
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
@@ -16,49 +16,83 @@
 import com.intellij.psi.xml.XmlTag;
 import com.intellij.util.ProcessingContext;
 import com.magento.idea.magento2plugin.indexes.PluginIndex;
+import com.magento.idea.magento2plugin.magento.files.ModuleDiXml;
 import com.magento.idea.magento2plugin.reference.xml.PolyVariantReferenceBase;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
 import org.jetbrains.annotations.NotNull;
 
 public class PluginReferenceProvider extends PsiReferenceProvider {
+
+    @SuppressWarnings({
+            "PMD.CognitiveComplexity",
+            "PMD.CyclomaticComplexity",
+            "PMD.NPathComplexity"
+    })
     @Override
     public @NotNull PsiReference[] getReferencesByElement(
-            @NotNull final PsiElement element,
-            @NotNull final ProcessingContext context
+            final @NotNull PsiElement element,
+            final @NotNull ProcessingContext context
     ) {
-        final List<PsiReference> psiReferences = new ArrayList<>();
-        final Project project = element.getProject();
-        final List<PsiElement> psiElements = new ArrayList<>();
+        if (!(element.getParent() instanceof XmlAttribute)
+                || !ModuleDiXml.NAME_ATTR.equals(((XmlAttribute) element.getParent()).getName())
+                || !(element.getParent().getParent() instanceof XmlTag)
+                || !ModuleDiXml.PLUGIN_TAG_NAME.equals(
+                        ((XmlTag) element.getParent().getParent()).getName())
+        ) {
+            return PsiReference.EMPTY_ARRAY;
+        }
 
         final XmlTag originalPluginTag = (XmlTag) element.getParent().getParent();
         final XmlTag originalTypeTag = originalPluginTag.getParentTag();
-        final String originalPluginName = originalPluginTag.getAttribute("name").getValue();
-        final String originalTypeName = originalTypeTag.getAttribute("name").getValue();
+
+        if (originalTypeTag == null || !ModuleDiXml.TYPE_TAG.equals(originalTypeTag.getName())) {
+            return PsiReference.EMPTY_ARRAY;
+        }
+        final XmlAttribute originalPluginNameAttr = originalPluginTag.getAttribute("name");
+        final XmlAttribute originalTypeNameAttr = originalTypeTag.getAttribute("name");
+
+        if (originalPluginNameAttr == null || originalTypeNameAttr == null) {
+            return PsiReference.EMPTY_ARRAY;
+        }
+        final String originalPluginName = originalPluginNameAttr.getValue();
+        final String originalTypeName = originalTypeNameAttr.getValue();
+
+        if (originalPluginName == null || originalTypeName == null) {
+            return PsiReference.EMPTY_ARRAY;
+        }
+        final Project project = element.getProject();
 
         final Collection<PsiElement> types = PluginIndex.getInstance(project).getPluginElements(
                 originalTypeName,
                 GlobalSearchScope.getScopeRestrictedByFileTypes(
                         GlobalSearchScope.allScope(project), XmlFileType.INSTANCE
                 )
         );
+        final List<PsiElement> psiElements = new ArrayList<>();
 
         for (final PsiElement type: types) {
             final XmlTag typeTag = (XmlTag) type.getParent().getParent();
             final XmlTag[] pluginTags = typeTag.findSubTags("plugin");
+
             for (final XmlTag pluginTag: pluginTags) {
                 final XmlAttribute pluginNameAttribute = pluginTag.getAttribute("name");
-                if (pluginNameAttribute.getValue().equals(originalPluginName)) {
+
+                if (pluginNameAttribute != null
+                        && pluginNameAttribute.getValue() != null
+                        && originalPluginName.equals(pluginNameAttribute.getValue())) {
                     psiElements.add(pluginNameAttribute.getValueElement());
                 }
             }
         }
+        final List<PsiReference> psiReferences = new ArrayList<>();
 
         if (!psiElements.isEmpty()) {
             final int startIndex = element.getText().indexOf(originalPluginName);
             final int endIndex = startIndex + originalPluginName.length();
             final TextRange range = new TextRange(startIndex, endIndex);
+
             psiReferences.add(new PolyVariantReferenceBase(element, range, psiElements));
         }
 

src/com/magento/idea/magento2plugin/reference/xml/XmlReferenceContributor.java

@@ -1,4 +1,4 @@
-/**
+/*
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
@@ -12,6 +12,7 @@
 import com.magento.idea.magento2plugin.magento.files.MftfActionGroup;
 import com.magento.idea.magento2plugin.magento.files.MftfTest;
 import com.magento.idea.magento2plugin.magento.files.ModuleDbSchemaXml;
+import com.magento.idea.magento2plugin.magento.files.ModuleDiXml;
 import com.magento.idea.magento2plugin.magento.files.ModuleMenuXml;
 import com.magento.idea.magento2plugin.magento.files.UiComponentXml;
 // CHECKSTYLE IGNORE check FOR NEXT 5 LINES
@@ -387,7 +388,7 @@ public void registerReferenceProviders(@NotNull PsiReferenceRegistrar registrar)
                         XmlPatterns.xmlAttribute().withName("disabled")
                     )
                 )
-            ).inFile(xmlFile().withName(string().endsWith("di.xml"))),
+            ).inFile(xmlFile().withName(string().matches(ModuleDiXml.FILE_NAME))),
             new PluginReferenceProvider()
         );