package com.opencsv;
   
   import com.opencsv.enums.CSVReaderNullFieldIndicator;
   import com.opencsv.processor.RowProcessor;
   import com.opencsv.validators.LineValidatorAggregator;
   import com.opencsv.validators.RowValidatorAggregator;
   import org.apache.commons.lang3.ObjectUtils;
   
   import java.io.Reader;
  import java.util.Locale;
  
  /**
   * Base class for the builders of various incarnations of CSVReaders.
   * @param <T> The type pf the CSVReader class to return
   *
   * @author Andrew Rucker Jones
   * @since 5.5.2
   */
  abstract public class CSVReaderBaseBuilder<T> {
      protected final Reader reader;
      protected final LineValidatorAggregator lineValidatorAggregator = new LineValidatorAggregator();
      protected final RowValidatorAggregator rowValidatorAggregator = new RowValidatorAggregator();
      private final CSVParserBuilder parserBuilder = new CSVParserBuilder();
      protected int skipLines = CSVReader.DEFAULT_SKIP_LINES;
      protected ICSVParser icsvParser = null;
      protected boolean keepCR;
      protected boolean verifyReader = CSVReader.DEFAULT_VERIFY_READER;
      protected CSVReaderNullFieldIndicator nullFieldIndicator = CSVReaderNullFieldIndicator.NEITHER;
      protected int multilineLimit = CSVReader.DEFAULT_MULTILINE_LIMIT;
      protected Locale errorLocale = Locale.getDefault();
      protected RowProcessor rowProcessor = null;
  
      /**
       * Base Constructor
       *
       * @param reader The reader to an underlying CSV source.
       */
      protected CSVReaderBaseBuilder(final Reader reader) {
          this.reader = reader;
      }
  
      /**
       * Used by unit tests.
       *
       * @return The reader.
       */
      protected Reader getReader() {
          return reader;
      }
  
      /**
       * Used by unit tests.
       *
       * @return The set number of lines to skip
       */
      protected int getSkipLines() {
          return skipLines;
      }
  
      /**
       * Used by unit tests.
       *
       * @return The CSVParser used by the builder.
       */
      protected ICSVParser getCsvParser() {
          return icsvParser;
      }
  
      /**
       * Used by unit tests.
       *
       * @return The upper limit on lines in multiline records.
       */
      protected int getMultilineLimit() {
          return multilineLimit;
      }
  
      /**
       * Returns if the reader built will keep or discard carriage returns.
       *
       * @return {@code true} if the reader built will keep carriage returns,
       * {@code false} otherwise
       */
      protected boolean keepCarriageReturn() {
          return this.keepCR;
      }
  
      /**
       * Creates a new {@link ICSVParser} if the class doesn't already hold one.
       *
       * @return The injected {@link ICSVParser} or a default parser.
       */
      protected ICSVParser getOrCreateCsvParser() {
          return ObjectUtils.defaultIfNull(icsvParser,
                  parserBuilder
                          .withFieldAsNull(nullFieldIndicator)
                          .withErrorLocale(errorLocale)
                          .build());
      }
 
     /**
      * @return The flag indicating whether the reader should be verified before each read.
      */
     public boolean isVerifyReader() {
         return verifyReader;
     }
 
     /**
      * @return The locale for error messages
      */
     public Locale getErrorLocale() {
         return errorLocale;
     }
 
     /**
      * @return The {@link LineValidatorAggregator} for custom defined {@link com.opencsv.validators.LineValidator}s.
      */
     public LineValidatorAggregator getLineValidatorAggregator() {
         return lineValidatorAggregator;
     }
 
     /**
      * @return The {@link RowValidatorAggregator} for the custom defined {@link com.opencsv.validators.RowValidator}s.
      */
     public RowValidatorAggregator getRowValidatorAggregator() {
         return rowValidatorAggregator;
     }
 
     /**
      * Must create the CSVReader type requested.
      * @return A new instance of {@link CSVReader} or derived class
      */
     public abstract T build();
 }