WrapExpressionFix.java

/*
 * Copyright 2000-2013 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.codeInsight.daemon.impl.quickfix;

import com.intellij.codeInsight.daemon.QuickFixBundle;
import com.intellij.codeInsight.daemon.impl.HighlightInfo;
import com.intellij.codeInsight.intention.IntentionAction;
import com.intellij.openapi.editor.Editor;
import com.intellij.openapi.project.Project;
import com.intellij.psi.*;
import com.intellij.psi.search.GlobalSearchScope;
import com.intellij.util.IncorrectOperationException;
import org.jetbrains.annotations.NonNls;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.util.LinkedHashSet;
import java.util.Set;

/**
 * @author ven
 */
public class WrapExpressionFix implements IntentionAction {

  private final PsiExpression myExpression;
  private final PsiClassType myExpectedType;
  private final boolean myPrimitiveExpected;

  public WrapExpressionFix(@NotNull PsiType expectedType, @NotNull PsiExpression expression) {
    myExpression = expression;
    myExpectedType = getClassType(expectedType, expression);
    myPrimitiveExpected = expectedType instanceof PsiPrimitiveType;
  }

  @Nullable
  private static PsiClassType getClassType(PsiType type, PsiElement place) {
    if (type instanceof PsiClassType) {
      return (PsiClassType)type;
    }
    else if (type instanceof PsiPrimitiveType) {
      return ((PsiPrimitiveType)type).getBoxedType(place.getManager(), GlobalSearchScope.allScope(place.getProject()));
    }
    return null;
  }

  @Override
  @NotNull
  public String getText() {
    PsiType type = myExpression.getType();
    final PsiMethod wrapper = myExpression.isValid() && myExpectedType != null && type != null ? findWrapper(type, myExpectedType, myPrimitiveExpected) : null;
    final String methodPresentation = wrapper != null ? wrapper.getContainingClass().getName() + "." + wrapper.getName() : "";
    return QuickFixBundle.message("wrap.expression.using.static.accessor.text", methodPresentation);
  }

  @Nullable
  private static PsiMethod findWrapper(@NotNull PsiType type, @NotNull PsiClassType expectedType, boolean primitiveExpected) {
    PsiClass aClass = expectedType.resolve();
    if (aClass != null) {
      PsiType expectedReturnType = expectedType;
      if (primitiveExpected) {
        expectedReturnType = PsiPrimitiveType.getUnboxedType(expectedType);
      }
      if (expectedReturnType == null) return null;
      PsiMethod[] methods = aClass.getMethods();
      final Set<PsiMethod> wrapperMethods = new LinkedHashSet<>();
      for (PsiMethod method : methods) {
        if (method.hasModifierProperty(PsiModifier.STATIC)
            && method.getParameterList().getParametersCount() == 1
            && method.getParameterList().getParameters()[0].getType().isAssignableFrom(type)
            && method.getReturnType() != null
            && expectedReturnType.equals(method.getReturnType())) {
          final String methodName = method.getName();
          if (methodName.startsWith("parse") || methodName.equals("valueOf")) {
            return method;
          }
          wrapperMethods.add(method);
        }
      }
      if (!wrapperMethods.isEmpty()) return wrapperMethods.iterator().next();
    }

    return null;
  }

  @Override
  @NotNull
  public String getFamilyName() {
    return QuickFixBundle.message("wrap.expression.using.static.accessor.family");
  }

  @Override
  public boolean isAvailable(@NotNull Project project, Editor editor, PsiFile file) {
    return myExpression.isValid()
           && myExpression.getManager().isInProject(myExpression)
           && myExpectedType != null
           && myExpectedType.isValid()
           && myExpression.getType() != null
           && findWrapper(myExpression.getType(), myExpectedType, myPrimitiveExpected) != null;
  }

  @Override
  public void invoke(@NotNull Project project, Editor editor, PsiFile file) throws IncorrectOperationException {
    PsiType type = myExpression.getType();
    assert type != null;
    PsiMethod wrapper = findWrapper(type, myExpectedType, myPrimitiveExpected);
    assert wrapper != null;
    PsiElementFactory factory = JavaPsiFacade.getInstance(file.getProject()).getElementFactory();
    @NonNls String methodCallText = "Foo." + wrapper.getName() + "()";
    PsiMethodCallExpression call = (PsiMethodCallExpression)factory.createExpressionFromText(methodCallText,
                                                                                             null);
    call.getArgumentList().add(myExpression);
    ((PsiReferenceExpression)call.getMethodExpression().getQualifierExpression()).bindToElement(
      wrapper.getContainingClass());
    myExpression.replace(call);
  }

  @Override
  public boolean startInWriteAction() {
    return true;
  }

  public static void registerWrapAction(JavaResolveResult[] candidates, PsiExpression[] expressions, HighlightInfo highlightInfo) {
    PsiType expectedType = null;
    PsiExpression expr = null;

    nextMethod:
    for (int i = 0; i < candidates.length && expectedType == null; i++) {
      final JavaResolveResult candidate = candidates[i];
      final PsiSubstitutor substitutor = candidate.getSubstitutor();
      final PsiElement element = candidate.getElement();
      assert element != null;
      final PsiMethod method = (PsiMethod)element;
      final PsiParameter[] parameters = method.getParameterList().getParameters();
      if (!method.isVarArgs() && parameters.length != expressions.length) continue;
      for (int j = 0; j < expressions.length; j++) {
        PsiExpression expression = expressions[j];
        final PsiType exprType = expression.getType();
        if (exprType != null) {
          PsiType paramType = parameters[Math.min(j, parameters.length - 1)].getType();
          if (paramType instanceof PsiEllipsisType) {
            paramType = ((PsiEllipsisType)paramType).getComponentType();
          }
          paramType = substitutor != null ? substitutor.substitute(paramType) : paramType;
          if (paramType.isAssignableFrom(exprType)) continue;
          final PsiClassType classType = getClassType(paramType, expression);
          if (expectedType == null && classType != null && findWrapper(exprType, classType, paramType instanceof PsiPrimitiveType) != null) {
            expectedType = paramType;
            expr = expression;
          }
          else {
            expectedType = null;
            expr = null;
            continue nextMethod;
          }
        }
      }
    }

    if (expectedType != null) {
      QuickFixAction.registerQuickFixAction(highlightInfo, expr.getTextRange(), new WrapExpressionFix(expectedType, expr));
    }
  }
}