CountMigration.java

/*
 * Copyright 2000-2017 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.codeInspection.streamMigration;

import com.intellij.openapi.project.Project;
import com.intellij.psi.*;
import org.jetbrains.annotations.NotNull;

/**
 * @author Tagir Valeev
 */
class CountMigration extends BaseStreamApiMigration {

  CountMigration(boolean shouldWarn) {
    super(shouldWarn, "count()");
  }

  @Override
  PsiElement migrate(@NotNull Project project, @NotNull PsiStatement body, @NotNull TerminalBlock tb) {
    PsiExpression expression = tb.getSingleExpression(PsiExpression.class);
    if (expression == null) {
      expression = tb.getCountExpression();
    }
    PsiExpression operand = StreamApiMigrationInspection.extractIncrementedLValue(expression);
    if (!(operand instanceof PsiReferenceExpression)) return null;
    PsiElement element = ((PsiReferenceExpression)operand).resolve();
    if (!(element instanceof PsiLocalVariable)) return null;
    PsiLocalVariable var = (PsiLocalVariable)element;
    return replaceWithNumericAddition(tb.getMainLoop(), var, tb.generate() + ".count()", PsiType.LONG);
  }
}