1 files changed, 147 insertions, 0 deletions
diff --git a/java/java-analysis-impl/src/com/intellij/refactoring/extractMethod/ExtractMethodUtil.java b/java/java-analysis-impl/src/com/intellij/refactoring/extractMethod/ExtractMethodUtil.java
new file mode 100644
index 000000000000..82ed68a44228
--- /dev/null
+++ b/java/java-analysis-impl/src/com/intellij/refactoring/extractMethod/ExtractMethodUtil.java
@@ -0,0 +1,147 @@
+/*
+ * Copyright 2000-2009 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 com.intellij.refactoring.extractMethod;
+
+import com.intellij.openapi.diagnostic.Logger;
+import com.intellij.openapi.util.Key;
+import com.intellij.psi.*;
+import com.intellij.psi.search.SearchScope;
+import com.intellij.psi.search.searches.ClassInheritorsSearch;
+import com.intellij.psi.search.searches.ReferencesSearch;
+import com.intellij.psi.util.PsiTreeUtil;
+import com.intellij.psi.util.RedundantCastUtil;
+import com.intellij.util.IncorrectOperationException;
+import com.intellij.util.Processor;
+import com.intellij.util.containers.HashMap;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.Map;
+
+/**
+ * @author ven
+ */
+public class ExtractMethodUtil {
+  private static final Key<PsiMethod> RESOLVE_TARGET_KEY = Key.create("RESOLVE_TARGET_KEY");
+  private static final Logger LOG = Logger.getInstance("com.intellij.refactoring.extractMethod.ExtractMethodUtil");
+
+  private ExtractMethodUtil() { }
+
+  static Map<PsiMethodCallExpression, PsiMethod> encodeOverloadTargets(final PsiClass targetClass,
+                                                        final SearchScope processConflictsScope,
+                                                        final String overloadName,
+                                                        final PsiElement extractedFragment) {
+    final Map<PsiMethodCallExpression, PsiMethod> ret = new HashMap<PsiMethodCallExpression, PsiMethod>();
+    encodeInClass(targetClass, overloadName, extractedFragment, ret);
+
+    ClassInheritorsSearch.search(targetClass, processConflictsScope, true).forEach(new Processor<PsiClass>() {
+      public boolean process(PsiClass inheritor) {
+        encodeInClass(inheritor, overloadName, extractedFragment, ret);
+        return true;
+      }
+    });
+
+    return ret;
+  }
+
+  private static void encodeInClass(final PsiClass aClass,
+                                    final String overloadName,
+                                    final PsiElement extractedFragment,
+                                    final Map<PsiMethodCallExpression, PsiMethod> ret) {
+    final PsiMethod[] overloads = aClass.findMethodsByName(overloadName, false);
+    for (final PsiMethod overload : overloads) {
+      for (final PsiReference ref : ReferencesSearch.search(overload)) {
+        final PsiElement element = ref.getElement();
+        final PsiElement parent = element.getParent();
+        if (parent instanceof PsiMethodCallExpression) {
+          final PsiMethodCallExpression call = (PsiMethodCallExpression)parent;
+          if (PsiTreeUtil.isAncestor(extractedFragment, element, false)) {
+            call.putCopyableUserData(RESOLVE_TARGET_KEY, overload);
+          } else {
+            //we assume element won't be invalidated as a result of extraction
+            ret.put(call, overload);
+          }
+        }
+      }
+    }
+  }
+
+  public static void decodeOverloadTargets(Map<PsiMethodCallExpression, PsiMethod> oldResolves, final PsiMethod extracted,
+                                           final PsiElement oldFragment) {
+    final PsiCodeBlock body = extracted.getBody();
+    assert body != null;
+    final JavaRecursiveElementVisitor visitor = new JavaRecursiveElementVisitor() {
+
+      @Override public void visitMethodCallExpression(PsiMethodCallExpression expression) {
+        super.visitMethodCallExpression(expression);
+        final PsiMethod target = expression.getCopyableUserData(RESOLVE_TARGET_KEY);
+        if (target != null) {
+          expression.putCopyableUserData(RESOLVE_TARGET_KEY, null);
+          try {
+            addCastsToEnsureResolveTarget(target, expression);
+          }
+          catch (IncorrectOperationException e) {
+            LOG.error(e);
+          }
+        }
+      }
+    };
+    body.accept(visitor);
+    oldFragment.accept(visitor);
+
+    for (final Map.Entry<PsiMethodCallExpression, PsiMethod> entry : oldResolves.entrySet()) {
+      try {
+        addCastsToEnsureResolveTarget(entry.getValue(), entry.getKey());
+      }
+      catch (IncorrectOperationException e) {
+        LOG.error(e);
+      }
+    }
+  }
+
+  public static void addCastsToEnsureResolveTarget(@NotNull final PsiMethod oldTarget, @NotNull final PsiMethodCallExpression call)
+    throws IncorrectOperationException {
+    final PsiMethod newTarget = call.resolveMethod();
+    final PsiManager manager = oldTarget.getManager();
+    final PsiElementFactory factory = JavaPsiFacade.getInstance(manager.getProject()).getElementFactory();
+    if (!manager.areElementsEquivalent(oldTarget, newTarget)) {
+      final PsiParameter[] oldParameters = oldTarget.getParameterList().getParameters();
+      if (oldParameters.length > 0) {
+        final PsiMethodCallExpression copy = (PsiMethodCallExpression)call.copy();
+        final PsiExpression[] args = copy.getArgumentList().getExpressions();
+        for (int i = 0; i < args.length; i++) {
+          PsiExpression arg = args[i];
+          PsiType paramType = i < oldParameters.length ? oldParameters[i].getType() : oldParameters[oldParameters.length - 1].getType();
+          final PsiTypeCastExpression cast = (PsiTypeCastExpression)factory.createExpressionFromText("(a)b", null);
+          final PsiTypeElement typeElement = cast.getCastType();
+          assert typeElement != null;
+          typeElement.replace(factory.createTypeElement(paramType));
+          final PsiExpression operand = cast.getOperand();
+          assert operand != null;
+          operand.replace(arg);
+          arg.replace(cast);
+        }
+
+        for (int i = 0; i < copy.getArgumentList().getExpressions().length; i++) {
+          PsiExpression oldarg = call.getArgumentList().getExpressions()[i];
+          PsiTypeCastExpression cast = (PsiTypeCastExpression)copy.getArgumentList().getExpressions()[i];
+          if (!RedundantCastUtil.isCastRedundant(cast)) {
+            oldarg.replace(cast);
+          }
+        }
+      }
+    }
+  }
+}