package org.apache.lucene.store;

/**
 * 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.
 */

import java.io.IOException;
import java.util.HashSet;
import java.util.Set;

import org.apache.lucene.analysis.MockAnalyzer;
import org.apache.lucene.index.IndexFileNames;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.index.LogMergePolicy;
import org.apache.lucene.index.TestIndexWriterReader;
import org.apache.lucene.util.LuceneTestCase;

public class TestFileSwitchDirectory extends LuceneTestCase {
  /**
   * Test if writing doc stores to disk and everything else to ram works.
   * @throws IOException
   */
  public void testBasic() throws IOException {
    Set<String> fileExtensions = new HashSet<String>();
    fileExtensions.add(IndexFileNames.FIELDS_EXTENSION);
    fileExtensions.add(IndexFileNames.FIELDS_INDEX_EXTENSION);
    
    Directory primaryDir = new MockDirectoryWrapper(new RAMDirectory());
    Directory secondaryDir = new MockDirectoryWrapper(new RAMDirectory());
    
    FileSwitchDirectory fsd = new FileSwitchDirectory(fileExtensions, primaryDir, secondaryDir, true);
    IndexWriter writer = new IndexWriter(fsd, new IndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer()));
    ((LogMergePolicy) writer.getConfig().getMergePolicy()).setUseCompoundFile(false);
    ((LogMergePolicy) writer.getConfig().getMergePolicy()).setUseCompoundDocStore(false);
    TestIndexWriterReader.createIndexNoClose(true, "ram", writer);
    IndexReader reader = writer.getReader();
    assertEquals(100, reader.maxDoc());
    writer.commit();
    // we should see only fdx,fdt files here
    String[] files = primaryDir.listAll();
    assertTrue(files.length > 0);
    for (int x=0; x < files.length; x++) {
      String ext = FileSwitchDirectory.getExtension(files[x]);
      assertTrue(fileExtensions.contains(ext));
    }
    files = secondaryDir.listAll();
    assertTrue(files.length > 0);
    // we should not see fdx,fdt files here
    for (int x=0; x < files.length; x++) {
      String ext = FileSwitchDirectory.getExtension(files[x]);
      assertFalse(fileExtensions.contains(ext));
    }
    reader.close();
    writer.close();

    files = fsd.listAll();
    for(int i=0;i<files.length;i++) {
      assertNotNull(files[i]);
    }
    fsd.close();
  }
}