GuavaTypeConversionDescriptor.java

/*
 * Copyright 2000-2016 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.typeMigration.rules.guava;

import com.intellij.openapi.diagnostic.Logger;
import com.intellij.psi.*;
import com.intellij.psi.util.PsiTypesUtil;
import com.intellij.refactoring.typeMigration.TypeConversionDescriptor;
import com.intellij.refactoring.typeMigration.TypeEvaluator;
import com.intellij.util.ArrayUtil;
import com.intellij.util.IncorrectOperationException;
import org.jetbrains.annotations.NonNls;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

/**
 * @author Dmitry Batkovich
 */
public class GuavaTypeConversionDescriptor extends TypeConversionDescriptor {
  private static final Logger LOG = Logger.getInstance(GuavaTypeConversionDescriptor.class);
  private final String myReplaceByStringSource;
  private boolean myConvertParameterAsLambda = true;

  GuavaTypeConversionDescriptor(@NonNls String stringToReplace, @NonNls String replaceByString) {
    super(stringToReplace, replaceByString);
    myReplaceByStringSource = replaceByString;
  }

  public GuavaTypeConversionDescriptor setConvertParameterAsLambda(boolean convertParameterAsLambda) {
    myConvertParameterAsLambda = convertParameterAsLambda;
    return this;
  }

  @Override
  public PsiExpression replace(PsiExpression expression, @NotNull TypeEvaluator evaluator) throws IncorrectOperationException {
    setReplaceByString(myReplaceByStringSource + (isIterable(expression) ? ".collect(java.util.stream.Collectors.toList())" : ""));
    if (myConvertParameterAsLambda) {
      LOG.assertTrue(expression instanceof PsiMethodCallExpression);
      final PsiExpression[] arguments = ((PsiMethodCallExpression)expression).getArgumentList().getExpressions();
      if (arguments.length == 1) {
        GuavaConversionUtil.adjustLambdaContainingExpression(arguments[0], false, null, evaluator);
      }
    }
    return super.replace(expression, evaluator);
  }

  public static boolean isIterable(PsiExpression expression) {
    final PsiElement parent = expression.getParent();
    if (parent instanceof PsiLocalVariable) {
      return isIterable(((PsiLocalVariable)parent).getType());
    }
    else if (parent instanceof PsiReturnStatement) {
      return isIterable(PsiTypesUtil.getMethodReturnType(parent));
    }
    else if (parent instanceof PsiExpressionList) {
      final PsiExpressionList expressionList = (PsiExpressionList)parent;
      final PsiElement maybeMethodCallExpr = expressionList.getParent();
      if (maybeMethodCallExpr instanceof PsiMethodCallExpression) {
        final PsiMethod method = ((PsiMethodCallExpression)maybeMethodCallExpr).resolveMethod();
        if (method != null) {
          final PsiParameter[] parameters = method.getParameterList().getParameters();
          final PsiExpression[] arguments = expressionList.getExpressions();
          if (parameters.length == arguments.length) {
            final int index = ArrayUtil.indexOf(arguments, expression);
            if (index != -1) {
              return isIterable(parameters[index].getType());
            }
          }
        }
      }
    }
    return false;
  }

  private static boolean isIterable(@Nullable PsiType type) {
    PsiClass aClass;
    return (aClass = PsiTypesUtil.getPsiClass(type)) != null && CommonClassNames.JAVA_LANG_ITERABLE.equals(aClass.getQualifiedName());
  }
}