BigDecimalMethodWithoutRoundingCalledInspection.java

/*
 * Copyright 2000-2014 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.siyeh.ig.numeric;

import com.intellij.psi.PsiExpression;
import com.intellij.psi.PsiExpressionList;
import com.intellij.psi.PsiMethodCallExpression;
import com.intellij.psi.PsiReferenceExpression;
import com.intellij.psi.util.PsiUtilCore;
import com.siyeh.InspectionGadgetsBundle;
import com.siyeh.ig.BaseInspection;
import com.siyeh.ig.BaseInspectionVisitor;
import com.siyeh.ig.psiutils.TypeUtils;
import org.jetbrains.annotations.Nls;
import org.jetbrains.annotations.NotNull;

/**
 * @author Bas Leijdekkers
 */
public class BigDecimalMethodWithoutRoundingCalledInspection extends BaseInspection {
  @Nls
  @NotNull
  @Override
  public String getDisplayName() {
    return InspectionGadgetsBundle.message("big.decimal.method.without.rounding.called.display.name");
  }

  @NotNull
  @Override
  protected String buildErrorString(Object... infos) {
    return InspectionGadgetsBundle.message("big.decimal.method.without.rounding.called.problem.descriptor");
  }

  @Override
  public BaseInspectionVisitor buildVisitor() {
    return new BigDecimalMethodWithoutRoundingCalledVisitor();
  }

  private static class BigDecimalMethodWithoutRoundingCalledVisitor extends BaseInspectionVisitor {

    @Override
    public void visitMethodCallExpression(PsiMethodCallExpression expression) {
      super.visitMethodCallExpression(expression);
      final PsiReferenceExpression methodExpression = expression.getMethodExpression();
      final String name = methodExpression.getReferenceName();
      if (!"setScale".equals(name) && !"divide".equals(name)) {
        return;
      }
      final PsiExpressionList argumentList = expression.getArgumentList();
      if (PsiUtilCore.hasErrorElementChild(argumentList)) {
        return;
      }
      final PsiExpression[] arguments = argumentList.getExpressions();
      if (arguments.length != 1) {
        return;
      }
      if (!TypeUtils.expressionHasTypeOrSubtype(expression, "java.math.BigDecimal")) {
        return;
      }
      registerMethodCallError(expression);
    }
  }
}