////////////////////////////////////////////////////////////////////////////////
   // checkstyle: Checks Java source code for adherence to a set of rules.
   // Copyright (C) 2001-2019 the original author or authors.
   //
   // This library is free software; you can redistribute it and/or
   // modify it under the terms of the GNU Lesser General Public
   // License as published by the Free Software Foundation; either
   // version 2.1 of the License, or (at your option) any later version.
   //
  // This library is distributed in the hope that it will be useful,
  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  // Lesser General Public License for more details.
  //
  // You should have received a copy of the GNU Lesser General Public
  // License along with this library; if not, write to the Free Software
  // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  ////////////////////////////////////////////////////////////////////////////////
  
  package com.puppycrawl.tools.checkstyle.checks.sizes;
  
  import com.puppycrawl.tools.checkstyle.StatelessCheck;
  import com.puppycrawl.tools.checkstyle.api.AbstractCheck;
  import com.puppycrawl.tools.checkstyle.api.DetailAST;
  import com.puppycrawl.tools.checkstyle.api.FileContents;
  import com.puppycrawl.tools.checkstyle.api.TokenTypes;
  import com.puppycrawl.tools.checkstyle.utils.CommonUtil;
  
  /**
   * <p>
   * Checks for long methods.
   * </p>
   * <p>
   * Rationale: If a method becomes very long it is hard to understand.
   * Therefore long methods should usually be refactored into several
   * individual methods that focus on a specific task.
   * </p>
   *<p>
   * The default maximum method length is 150 lines. To change the maximum
   * number of lines, set property max.
   * </p>
   * <p>
   * An example of how to configure the check is:
   * </p>
   * <pre>
   * &lt;module name="MethodLength"/&gt;
   * </pre>
   * <p>
   * An example of how to configure the check so that it accepts methods with at
   * most 60 lines is:
   * </p>
   * <pre>
   * &lt;module name="MethodLength"&gt;
   *    &lt;property name="max" value="60"/&gt;
   * &lt;/module&gt;
   * </pre>
   */
  @StatelessCheck
  public class MethodLengthCheck extends AbstractCheck {
  
      /**
       * A key is pointing to the warning message text in "messages.properties"
       * file.
       */
      public static final String MSG_KEY = "maxLen.method";
  
      /** Default maximum number of lines. */
      private static final int DEFAULT_MAX_LINES = 150;
  
      /** Whether to ignore empty lines and single line comments. */
      private boolean countEmpty = true;
  
      /** The maximum number of lines. */
      private int max = DEFAULT_MAX_LINES;
  
      @Override
      public int[] getDefaultTokens() {
          return getAcceptableTokens();
      }
  
      @Override
      public int[] getAcceptableTokens() {
          return new int[] {TokenTypes.METHOD_DEF, TokenTypes.CTOR_DEF};
      }
  
      @Override
      public int[] getRequiredTokens() {
          return CommonUtil.EMPTY_INT_ARRAY;
      }
  
      @Override
      public void visitToken(DetailAST ast) {
          final DetailAST openingBrace = ast.findFirstToken(TokenTypes.SLIST);
          if (openingBrace != null) {
              final DetailAST closingBrace =
                  openingBrace.findFirstToken(TokenTypes.RCURLY);
              final int length = getLengthOfBlock(openingBrace, closingBrace);
              if (length > max) {
                  log(ast, MSG_KEY, length, max);
             }
         }
     }
 
     /**
      * Returns length of code only without comments and blank lines.
      * @param openingBrace block opening brace
      * @param closingBrace block closing brace
      * @return number of lines with code for current block
      */
     private int getLengthOfBlock(DetailAST openingBrace, DetailAST closingBrace) {
         int length = closingBrace.getLineNo() - openingBrace.getLineNo() + 1;
 
         if (!countEmpty) {
             final FileContents contents = getFileContents();
             final int lastLine = closingBrace.getLineNo();
             // lastLine - 1 is actual last line index. Last line is line with curly brace,
             // which is always not empty. So, we make it lastLine - 2 to cover last line that
             // actually may be empty.
             for (int i = openingBrace.getLineNo() - 1; i <= lastLine - 2; i++) {
                 if (contents.lineIsBlank(i) || contents.lineIsComment(i)) {
                     length--;
                 }
             }
         }
         return length;
     }
 
     /**
      * Sets maximum length of a method.
      * @param length the maximum length of a method.
      */
     public void setMax(int length) {
         max = length;
     }
 
     /**
      * Sets countEmpty.
      * @param countEmpty whether to count empty and single line comments
      *     of the form //.
      */
     public void setCountEmpty(boolean countEmpty) {
         this.countEmpty = countEmpty;
     }
 
 }