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/*
 * 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 com.gemstone.gemfire.cache.lucene.internal.filesystem;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Serializable;
import java.util.UUID;

import com.gemstone.gemfire.DataSerializer;
import com.gemstone.gemfire.internal.DataSerializableFixedID;
import com.gemstone.gemfire.internal.Version;

/**
 * A file that is stored in a gemfire region.
 */
public class File implements DataSerializableFixedID {
  
  private transient FileSystem fileSystem;
  private transient int chunkSize;

  private String name;
  long length = 0;
  int chunks = 0;
  long created = System.currentTimeMillis();
  long modified = created;
  UUID id = UUID.randomUUID();
  
  /**
   * Constructor for serialization only
   */
  public File() {
  }

  File(final FileSystem fileSystem, final String name) {
    setFileSystem(fileSystem);
    
    this.name = name;
  }

  /**
   * @return the name
   */
  public String getName() {
    return name;
  }

  /**
   * @return the length
   */
  public long getLength() {
    return length;
  }

  /**
   * @return the created
   */
  public long getCreated() {
    return created;
  }

  /**
   * @return the modified
   */
  public long getModified() {
    return modified;
  }

  /**
   * Get an input stream that reads from the beginning the file
   * 
   * The input stream is not threadsafe
   */
  public SeekableInputStream getInputStream() {
    // TODO get read lock?
    return new FileInputStream(this);
  }

  /**
   * Get an output stream that appends to the end
   * of the file.
   */
  public OutputStream getOutputStream() {
    return new FileOutputStream(this);
  }

  void setFileSystem(final FileSystem fileSystem) {
    this.fileSystem = fileSystem;
    this.chunkSize = FileSystem.CHUNK_SIZE;
  }

  int getChunkSize() {
    return chunkSize;
  }

  public FileSystem getFileSystem() {
    return fileSystem;
  }

  @Override
  public Version[] getSerializationVersions() {
    return null;
  }

  @Override
  public int getDSFID() {
    return LUCENE_FILE;
  }

  @Override
  public void toData(DataOutput out) throws IOException {
    DataSerializer.writeString(name, out);
    out.writeLong(length);
    out.writeInt(chunks);
    out.writeLong(created);
    out.writeLong(modified);
    out.writeLong(id.getMostSignificantBits());
    out.writeLong(id.getLeastSignificantBits());
  }

  @Override
  public void fromData(DataInput in)
      throws IOException, ClassNotFoundException {
    name = DataSerializer.readString(in);
    length = in.readLong();
    chunks = in.readInt();
    created = in.readLong();
    modified = in.readLong();
    long high = in.readLong();
    long low = in.readLong();
    id = new UUID(high, low);
  }
  
  
}