/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.mahout.utils.vectors.csv;

import com.google.common.io.Closeables;
import org.apache.mahout.math.Vector;
import org.apache.mahout.utils.MahoutTestCase;
import org.apache.mahout.utils.vectors.RandomVectorIterable;
import org.apache.mahout.utils.vectors.VectorHelper;
import org.apache.mahout.utils.vectors.io.TextualVectorWriter;
import org.junit.Test;

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

public class CSVVectorIteratorTest extends MahoutTestCase {

  @Test
  public void testCount() throws Exception {

    StringWriter sWriter = new StringWriter();
    TextualVectorWriter writer = new TextualVectorWriter(sWriter) {
      @Override
      public void write(Vector vector) throws IOException {
        String vecStr = VectorHelper.vectorToCSVString(vector, false);
        getWriter().write(vecStr);
      }
    };
    try {
      Iterable<Vector> iter = new RandomVectorIterable(50);
      writer.write(iter);
    } finally {
      Closeables.closeQuietly(writer);
    }
    Iterator<Vector> csvIter = new CSVVectorIterator(new StringReader(sWriter.getBuffer().toString()));
    int count = 0;
    while (csvIter.hasNext()) {
      csvIter.next();
      count++;
    }
    assertEquals(50, count);
  }
}