/*
 * 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.uima.fit.component;

import static org.apache.uima.fit.factory.CollectionReaderFactory.createReader;
import static org.junit.Assert.assertEquals;

import java.io.File;
import java.io.IOException;

import org.apache.commons.io.FileUtils;
import org.apache.uima.cas.CAS;
import org.apache.uima.collection.CollectionException;
import org.apache.uima.collection.CollectionReader;
import org.apache.uima.jcas.JCas;
import org.apache.uima.util.CasCreationUtils;
import org.apache.uima.util.Progress;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.TemporaryFolder;
import org.uimafit.descriptor.ConfigurationParameter;

/**
 * Test {@link JCasCollectionReader_ImplBase}
 * 
 */
public class JCasCollectionReader_ImplBaseTest {

  @Rule
  public TemporaryFolder folder = new TemporaryFolder();

  /**
   * Test using a simple reader reading one text file.
   * 
   * @throws Exception
   *           if an error occurs.
   */
  @Test
  public void test() throws Exception {
    File file = folder.newFile("test.txt");
    FileUtils.write(file, "Aaa Bbbb Cc Dddd eeee ff .", "UTF-8");

    CollectionReader reader = createReader(SingleTextReader.class,
            SingleTextReader.PARAM_FILE, file.getPath());

    CAS cas = CasCreationUtils.createCas(reader.getProcessingResourceMetaData());
    reader.getNext(cas);
    reader.close();

    assertEquals(FileUtils.readFileToString(file, "UTF-8"), cas.getDocumentText());
  }

  public static class SingleTextReader extends JCasCollectionReader_ImplBase {
    public static final String PARAM_FILE = "File";

    @ConfigurationParameter(name = PARAM_FILE, mandatory = true)
    private File file;

    public boolean hasNext() throws IOException, CollectionException {
      return file != null;
    }

    public Progress[] getProgress() {
      return new Progress[0];
    }

    @Override
    public void getNext(JCas jCas) throws IOException, CollectionException {
      jCas.setDocumentText(FileUtils.readFileToString(file, "UTF-8"));
    }
  }
}