Add introduce operation object, rewrite for introduce dialog support

src/com/goide/psi/impl/GoElementFactory.java

@@ -103,11 +103,11 @@ public static GoSignature createFunctionSignatureFromText(@NotNull Project proje
   }
 
   @NotNull
-  public static GoStatement createVarDeclarationStatement(@NotNull Project project,
-                                                          @NotNull String name,
-                                                          @NotNull GoExpression initializer, boolean shortDeclaration) {
+  public static GoStatement createShortVarDeclarationStatement(@NotNull Project project,
+                                                               @NotNull String name,
+                                                               @NotNull GoExpression initializer) {
     GoFile file = createFileFromText(project, "package a; func a() {\n " + name + " := " + initializer.getText() + "}");
-    return PsiTreeUtil.findChildOfType(file, shortDeclaration ? GoSimpleStatement.class : GoStatement.class);
+    return PsiTreeUtil.findChildOfType(file, GoSimpleStatement.class);
   }
 
   @NotNull

src/com/goide/refactor/GoIntroduceOperation.java

@@ -0,0 +1,105 @@
+/*
+ * Copyright 2013-2015 Sergey Ignatov, Alexander Zolotov, Mihai Toader, Florin Patan
+ *
+ * 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 com.goide.refactor;
+
+import com.goide.psi.GoExpression;
+import com.goide.psi.GoVarDefinition;
+import com.intellij.openapi.editor.Editor;
+import com.intellij.openapi.project.Project;
+import com.intellij.psi.PsiElement;
+import com.intellij.psi.PsiFile;
+
+import java.util.LinkedHashSet;
+import java.util.List;
+
+public class GoIntroduceOperation {
+  final private Project myProject;
+  final private Editor myEditor;
+  final private PsiFile myFile;
+  private GoExpression myExpression;
+  private List<PsiElement> myOccurrences;
+  private LinkedHashSet<String> mySuggestedNames;
+  private String myName;
+  private GoVarDefinition myVar;
+  private boolean myReplaceAll;
+
+  public GoIntroduceOperation(Project project, Editor editor, PsiFile file) {
+    myProject = project;
+    myEditor = editor;
+    myFile = file;
+  }
+
+  public Project getProject() {
+    return myProject;
+  }
+
+  public Editor getEditor() {
+    return myEditor;
+  }
+
+  public PsiFile getFile() {
+    return myFile;
+  }
+
+  public GoExpression getExpression() {
+    return myExpression;
+  }
+
+  public void setExpression(GoExpression expression) {
+    myExpression = expression;
+  }
+
+  public List<PsiElement> getOccurrences() {
+    return myOccurrences;
+  }
+
+  public void setOccurrences(List<PsiElement> occurrences) {
+    myOccurrences = occurrences;
+  }
+
+  public LinkedHashSet<String> getSuggestedNames() {
+    return mySuggestedNames;
+  }
+
+  public void setSuggestedNames(LinkedHashSet<String> suggestedNames) {
+    mySuggestedNames = suggestedNames;
+  }
+
+  public String getName() {
+    return myName;
+  }
+
+  public void setName(String name) {
+    myName = name;
+  }
+
+  public GoVarDefinition getVar() {
+    return myVar;
+  }
+
+  public void setVar(GoVarDefinition var) {
+    myVar = var;
+  }
+
+  public boolean isReplaceAll() {
+    return myReplaceAll;
+  }
+
+  public void setReplaceAll(boolean replaceAll) {
+    myReplaceAll = replaceAll;
+  }
+}