DontUseNewPairInspection.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 org.jetbrains.idea.devkit.inspections.internal;

import com.intellij.codeInspection.ProblemHighlightType;
import com.intellij.codeInspection.ProblemsHolder;
import com.intellij.pom.java.LanguageLevel;
import com.intellij.psi.*;
import com.intellij.psi.util.PsiUtil;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.idea.devkit.inspections.DevKitInspectionBase;
import org.jetbrains.idea.devkit.inspections.quickfix.ChangeToPairCreateQuickFix;

import java.util.Arrays;

/**
 * @author Konstantin Bulenkov
 */
public class DontUseNewPairInspection extends DevKitInspectionBase {
  private static final String PAIR_FQN = "com.intellij.openapi.util.Pair";

  @Override
  public PsiElementVisitor buildInternalVisitor(@NotNull final ProblemsHolder holder, boolean isOnTheFly) {
    return new JavaElementVisitor() {
      @Override
      public void visitNewExpression(PsiNewExpression expression) {
        final PsiType type = expression.getType();
        final PsiExpressionList params = expression.getArgumentList();
        if (type instanceof PsiClassType
            && ((PsiClassType)type).rawType().equalsToText(PAIR_FQN)
            && params != null
            && expression.getArgumentList() != null
            && !PsiUtil.getLanguageLevel(expression).isAtLeast(LanguageLevel.JDK_1_7) //diamonds
        ) {
          final PsiType[] types = ((PsiClassType)type).getParameters();
          if (Arrays.equals(types, params.getExpressionTypes())) {
            holder.registerProblem(expression, "Replace to Pair.create()", ProblemHighlightType.GENERIC_ERROR_OR_WARNING,
                                   new ChangeToPairCreateQuickFix());
          }
        }
        super.visitNewExpression(expression);
      }
    };
  }

  @NotNull
  @Override
  public String getShortName() {
    return "DontUsePairConstructor";
  }
}