UseDPIAwareInsetsInspection.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.InspectionManager;
import com.intellij.codeInspection.ProblemDescriptor;
import com.intellij.codeInspection.ProblemHighlightType;
import com.intellij.codeInspection.ProblemsHolder;
import com.intellij.openapi.project.Project;
import com.intellij.psi.*;
import com.intellij.psi.search.GlobalSearchScope;
import com.intellij.util.ui.JBInsets;
import com.intellij.util.ui.JBUI;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.idea.devkit.inspections.DevKitInspectionBase;
import org.jetbrains.idea.devkit.inspections.quickfix.ConvertToJBInsetsQuickFix;

/**
 * @author Konstantin Bulenkov
 */
public class UseDPIAwareInsetsInspection extends DevKitInspectionBase {
  @Override
  public PsiElementVisitor buildInternalVisitor(@NotNull final ProblemsHolder holder, final boolean isOnTheFly) {
    return new JavaElementVisitor() {
      @Override
      public void visitNewExpression(PsiNewExpression expression) {
        final ProblemDescriptor descriptor = checkNewExpression(expression, holder.getManager(), isOnTheFly);
        if (descriptor != null) {
          holder.registerProblem(descriptor);
        }
        super.visitNewExpression(expression);
      }
    };
  }

  @Nullable
  private static ProblemDescriptor checkNewExpression(PsiNewExpression expression, InspectionManager manager, boolean isOnTheFly) {
    final Project project = manager.getProject();
    final PsiType type = expression.getType();
    final PsiExpressionList arguments = expression.getArgumentList();
    if (type != null && arguments != null && type.equalsToText("java.awt.Insets")) {
      if (expression.getParent() instanceof PsiExpressionList) {
        PsiElement parent = expression.getParent();
        PsiElement superParent = parent.getParent();
        if (superParent instanceof PsiMethodCallExpression) {
          PsiType methodType = ((PsiMethodCallExpression)superParent).getType();
          if (methodType != null && methodType.equalsToText(JBInsets.class.getName())) {
            return null;
          }
        }
      }
      final JavaPsiFacade facade = JavaPsiFacade.getInstance(project);
      final PsiClass jbuiClass = facade.findClass(JBUI.class.getName(), GlobalSearchScope.allScope(project));
      if (jbuiClass != null && facade.getResolveHelper().isAccessible(jbuiClass, expression, jbuiClass)) {
        final PsiElement parent = expression.getParent();
        if (parent instanceof PsiExpressionList && parent.getParent() instanceof PsiNewExpression) {
          final PsiType parentType = ((PsiNewExpression)parent.getParent()).getType();
          if (parentType == null || JBInsets.class.getName().equals(parentType.getCanonicalText())) return null;
        }
        if (arguments.getExpressions().length == 4) {
          return manager.createProblemDescriptor(expression, "Replace with JBUI.insets(...)", new ConvertToJBInsetsQuickFix(),
                                                 ProblemHighlightType.GENERIC_ERROR_OR_WARNING, isOnTheFly);
        }
      }
    }
    return null;
  }

}