/***********************************************************************************************************************
 * Copyright (C) 2010-2013 by the Stratosphere project (http://stratosphere.eu)
 *
 * 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 eu.stratosphere.runtime.fs;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.fail;

import java.io.File;
import java.io.PrintWriter;

import org.junit.Test;

import eu.stratosphere.core.fs.FSDataInputStream;
import eu.stratosphere.core.fs.Path;
import eu.stratosphere.core.fs.local.LocalFileSystem;
import eu.stratosphere.nephele.util.CommonTestUtils;

/**
 * This class tests the functionality of the LineReader class using a local filesystem.
 * 
 */

public class LineReaderTest {

	/**
	 * This test tests the LineReader. So far only under usual conditions.
	 */
	@Test
	public void testLineReader() {
		final File testfile = new File(CommonTestUtils.getTempDir() + File.separator
			+ CommonTestUtils.getRandomFilename());
		final Path pathtotestfile = new Path(testfile.toURI().getPath());

		try {
			PrintWriter pw = new PrintWriter(testfile, "UTF8");

			for (int i = 0; i < 100; i++) {
				pw.append("line\n");
			}
			pw.close();

			LocalFileSystem lfs = new LocalFileSystem();
			FSDataInputStream fis = lfs.open(pathtotestfile);

			// first, we test under "usual" conditions
			final LineReader lr = new LineReader(fis, 0, testfile.length(), 256);

			byte[] buffer;
			int linecount = 0;
			while ((buffer = lr.readLine()) != null) {
				assertEquals(new String(buffer, "UTF8"), "line");
				linecount++;
			}
			assertEquals(linecount, 100);

			// the linereader can not handle situations with larger length than the total file...

		} catch (Exception e) {
			fail(e.toString());
			e.printStackTrace();
		} finally {
			testfile.delete();
		}

	}

}