/*
 * 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.commons.net.ftp.parser;

import org.apache.commons.net.ftp.FTPFile;
import org.apache.commons.net.ftp.FTPFileEntryParser;
import org.apache.commons.net.ftp.FTPFileEntryParserImpl;

/**
 * This implementation allows to pack some FileEntryParsers together
 * and handle the case where to returned dirstyle isnt clearly defined.
 * The matching parser will be cached.
 * If the cached parser wont match due to the server changed the dirstyle,
 * a new matching parser will be searched.
 */
public class CompositeFileEntryParser extends FTPFileEntryParserImpl {
  private final FTPFileEntryParser[] ftpFileEntryParsers;
  private FTPFileEntryParser cachedFtpFileEntryParser;

  public CompositeFileEntryParser(FTPFileEntryParser[] ftpFileEntryParsers) {
    super();

    this.cachedFtpFileEntryParser = null;
    this.ftpFileEntryParsers = ftpFileEntryParsers;
  }

  @Override public FTPFile parseFTPEntry(String listEntry) {
    if (cachedFtpFileEntryParser != null) {
      FTPFile matched = cachedFtpFileEntryParser.parseFTPEntry(listEntry);
      if (matched != null) {
        return matched;
      }
    } else {
      for (FTPFileEntryParser ftpFileEntryParser : ftpFileEntryParsers) {
        FTPFile matched = ftpFileEntryParser.parseFTPEntry(listEntry);
        if (matched != null) {
          cachedFtpFileEntryParser = ftpFileEntryParser;
          return matched;
        }
      }
    }
    return null;
  }
}
