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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 org.apache.james.mime4j.field.address;

import org.apache.james.mime4j.field.address.parser.AddressListParser;
import org.apache.james.mime4j.field.address.parser.ParseException;

import java.io.StringReader;
import java.util.ArrayList;

/**
 * An immutable, random-access list of Address objects.
 *
 * 
 */
public class AddressList {
  
  private ArrayList addresses;

  /**
   * @param addresses An ArrayList that contains only Address objects. 
   * @param dontCopy true iff it is not possible for the addresses ArrayList to be modified by someone else.
   */
  public AddressList(ArrayList addresses, boolean dontCopy) {
    if (addresses != null)
      this.addresses = (dontCopy ? addresses : (ArrayList) addresses.clone());
    else
      this.addresses = new ArrayList(0);
  }

  /**
   * The number of elements in this list.
   */
  public int size() {
    return addresses.size();
  }

  /**
   * Gets an address. 
   */
  public Address get(int index) {
    if (0 > index || size() <= index)
      throw new IndexOutOfBoundsException();
    return (Address) addresses.get(index);
  }

  /**
   * Returns a flat list of all mailboxes represented
   * in this address list. Use this if you don't care
   * about grouping. 
   */
  public MailboxList flatten() {
    // in the common case, all addresses are mailboxes
    boolean groupDetected = false;
    for (int i = 0; i < size(); i++) {
      if (!(get(i) instanceof Mailbox)) {
        groupDetected = true;
        break;
      }
    }
    
    if (!groupDetected)
      return new MailboxList(addresses, true);
    
    ArrayList results = new ArrayList();
    for (int i = 0; i < size(); i++) {
      Address addr = get(i);
      addr.addMailboxesTo(results);
    }
    
    // copy-on-construct this time, because subclasses
    // could have held onto a reference to the results
    return new MailboxList(results, false);
  }
  
  /**
   * Dumps a representation of this address list to
   * stdout, for debugging purposes.
   */
  public void print() {
    for (int i = 0; i < size(); i++) {
      Address addr = get(i);
      System.out.println(addr.toString());
    }
  }



  /**
   * Parse the address list string, such as the value 
   * of a From, To, Cc, Bcc, Sender, or Reply-To
   * header.
   * 
   * The string MUST be unfolded already.
   */
  public static AddressList parse(String rawAddressList) throws ParseException {
    AddressListParser parser = new AddressListParser(new StringReader(rawAddressList));
    return Builder.getInstance().buildAddressList(parser.parse());
  }
  
  /**
   * Test console.
   */
  public static void main(String[] args) throws Exception {
    java.io.BufferedReader reader = new java.io.BufferedReader(new java.io.InputStreamReader(System.in));
    while (true) {
      try {
        System.out.print("> ");
        String line = reader.readLine();
        if (line.length() == 0 || line.toLowerCase().equals("exit") || line.toLowerCase().equals("quit")) {
          System.out.println("Goodbye.");
          return;
        }
        AddressList list = parse(line);
        list.print();
      }
      catch(Exception e) {
        e.printStackTrace();
        Thread.sleep(300);
      }
    }
  }
}
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