Add method override autocompletion for Groovy Plugin

plugins/groovy/src/org/jetbrains/plugins/groovy/lang/completion/GrMethodOverrideCompletionProvider.java

@@ -0,0 +1,106 @@
+/*
+ * Copyright 2000-2015 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jetbrains.plugins.groovy.lang.completion;
+
+import com.intellij.codeInsight.completion.*;
+import com.intellij.codeInsight.generation.OverrideImplementExploreUtil;
+import com.intellij.codeInsight.lookup.LookupElement;
+import com.intellij.codeInsight.lookup.LookupElementBuilder;
+import com.intellij.icons.AllIcons;
+import com.intellij.patterns.PlatformPatterns;
+import com.intellij.psi.*;
+import com.intellij.psi.infos.CandidateInfo;
+import com.intellij.psi.util.PsiFormatUtil;
+import com.intellij.psi.util.PsiFormatUtilBase;
+import com.intellij.psi.util.PsiTreeUtil;
+import com.intellij.ui.RowIcon;
+import com.intellij.util.ProcessingContext;
+import com.intellij.util.VisibilityUtil;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.plugins.groovy.lang.completion.handlers.GroovyMethodOverrideHandler;
+
+import javax.swing.*;
+import java.util.Collection;
+
+import static com.intellij.patterns.PlatformPatterns.psiElement;
+
+/**
+ * Created by Arasthel on 29/01/15.
+ */
+
+class GrMethodOverrideCompletionProvider extends CompletionProvider<CompletionParameters> {
+
+  @Override
+  protected void addCompletions(@NotNull CompletionParameters parameters, ProcessingContext context, @NotNull CompletionResultSet result) {
+    PsiElement position = parameters.getPosition();
+
+    if(psiElement()
+            .inside(PsiClass.class)
+            .accepts(position)) {
+
+      PsiClass currentClass = PsiTreeUtil.getParentOfType(position, PsiClass.class);
+
+      if (currentClass != null) {
+        addSuperMethods(currentClass, result, false);
+        addSuperMethods(currentClass, result, true);
+      }
+    }
+  }
+
+  public static void register(CompletionContributor contributor) {
+    contributor.extend(CompletionType.BASIC, PlatformPatterns.psiElement(PsiElement.class), new GrMethodOverrideCompletionProvider());
+  }
+
+  private void addSuperMethods(final PsiClass psiClass, CompletionResultSet completionResultSet, boolean implement) {
+    Collection<CandidateInfo> candidates = OverrideImplementExploreUtil.getMethodsToOverrideImplement(psiClass, implement);
+    for(CandidateInfo candidateInfo : candidates) {
+      final PsiMethod method = (PsiMethod) candidateInfo.getElement();
+      PsiSubstitutor substitutor = candidateInfo.getSubstitutor();
+
+      RowIcon icon = new RowIcon(2);
+      icon.setIcon(method.getIcon(0), 0);
+      icon.setIcon(implement ? AllIcons.Gutter.ImplementingMethod : AllIcons.Gutter.OverridingMethod, 1);
+
+      if(!method.isConstructor()) {
+        completionResultSet.addElement(createLookUpElement(method, substitutor, psiClass, icon, new GroovyMethodOverrideHandler(psiClass)));
+      }
+    }
+  }
+
+  private LookupElementBuilder createLookUpElement(final PsiMethod method, PsiSubstitutor substitutor, PsiClass currentClass, Icon icon,
+                                                   InsertHandler<LookupElement> insertHandler) {
+    String parameters = PsiFormatUtil.formatMethod(method, substitutor, PsiFormatUtilBase.SHOW_PARAMETERS, PsiFormatUtilBase.SHOW_NAME);
+
+    String visibility = VisibilityUtil.getVisibilityModifier(method.getModifierList());
+    String modifiers = (visibility == PsiModifier.PACKAGE_LOCAL ? "" : visibility + " ");
+
+    PsiType type = substitutor.substitute(method.getReturnType());
+
+    String parentClassName = currentClass == null ? "" : ((PsiNamedElement) currentClass).getName();
+
+    String signature = modifiers + (type == null ? "" : type.getPresentableText() + " ") + method.getName();
+
+    LookupElementBuilder elementBuilder = LookupElementBuilder.create(method, signature)
+      .withLookupString(signature)
+      .appendTailText(parameters, false)
+      .appendTailText("{...}", true)
+      .withTypeText(parentClassName)
+      .withIcon(icon)
+      .withInsertHandler(insertHandler);
+
+    return elementBuilder;
+  }
+}

plugins/groovy/src/org/jetbrains/plugins/groovy/lang/completion/GroovyCompletionContributor.java

@@ -44,6 +44,7 @@ public class GroovyCompletionContributor extends CompletionContributor {
 
 
   public GroovyCompletionContributor() {
+    GrMethodOverrideCompletionProvider.register(this);
     GrThisSuperCompletionProvider.register(this);
     MapArgumentCompletionProvider.register(this);
     GroovyConfigSlurperCompletionProvider.register(this);

plugins/groovy/src/org/jetbrains/plugins/groovy/lang/completion/handlers/GroovyMethodOverrideHandler.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright 2000-2015 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jetbrains.plugins.groovy.lang.completion.handlers;
+
+import com.intellij.codeInsight.completion.InsertHandler;
+import com.intellij.codeInsight.completion.InsertionContext;
+import com.intellij.codeInsight.generation.GenerateMembersUtil;
+import com.intellij.codeInsight.generation.OverrideImplementUtil;
+import com.intellij.codeInsight.lookup.LookupElement;
+import com.intellij.psi.PsiClass;
+import com.intellij.psi.PsiMethod;
+
+import java.util.List;
+
+/**
+ * Created by Arasthel on 29/01/15.
+ */
+public class GroovyMethodOverrideHandler implements InsertHandler<LookupElement> {
+
+  private PsiClass myPsiClass;
+
+  public GroovyMethodOverrideHandler(PsiClass aClass) {
+    this.myPsiClass = aClass;
+  }
+
+  @Override
+  public void handleInsert(InsertionContext context, LookupElement item) {
+    context.getDocument().deleteString(context.getStartOffset(), context.getTailOffset());
+    PsiMethod method = (PsiMethod) item.getObject();
+    List<PsiMethod> prototypes = OverrideImplementUtil.overrideOrImplementMethod(myPsiClass, method, false);
+    context.commitDocument();
+    GenerateMembersUtil.insertMembersAtOffset(context.getFile(), context.getStartOffset(),
+                                              OverrideImplementUtil.convert2GenerationInfos(prototypes));
+  }
+}