com.opencsv.CSVIterator Maven / Gradle / Ivy

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A simple library for reading and writing CSV in Java

There is a newer version: 5.9

package com.opencsv;

import java.io.IOException;
import java.util.Iterator;

/**
 * Provides an Iterator over the data found in opencsv.
 */
public class CSVIterator implements Iterator {
   private CSVReader reader;
   private String[] nextLine;

   /**
    * @param reader reader for the csv data.
    * @throws IOException if unable to read data from the reader.
    */
   public CSVIterator(CSVReader reader) throws IOException {
      this.reader = reader;
      nextLine = reader.readNext();
   }

   /**
    * Returns true if the iteration has more elements.
    * In other words, returns true if next() would return an element rather than throwing an exception.
    *
    * @return true if the CSVIterator has more elements.
    */
   public boolean hasNext() {
      return nextLine != null;
   }

   /**
    *
    * Returns the next elenebt in the iterator.
    *
    * @return The next element of the iterator.
    */
   public String[] next() {
      String[] temp = nextLine;
      try {
         nextLine = reader.readNext();
      } catch (IOException e) {
         throw new RuntimeException(e);
      }
      return temp;
   }

   /**
    * This method is not supported by openCSV and will throw a UnsupportedOperationException if called.
    */
   public void remove() {
      throw new UnsupportedOperationException("This is a read only iterator.");
   }
}