package com.atlassian.sal.core.message;
   
   import com.atlassian.sal.api.message.Message;
   import com.atlassian.sal.api.message.MessageCollection;
   
   import java.io.Serializable;
   import java.util.ArrayList;
   import java.util.List;
   
  public class DefaultMessageCollection implements MessageCollection {
      private final List<Message> messages = new ArrayList<Message>();
  
      public void addMessage(String key, Serializable... arguments) {
          addMessage(new DefaultMessage(key, arguments));
      }
  
      public void addMessage(Message message) {
          messages.add(message);
      }
  
      public boolean isEmpty() {
          return messages.isEmpty();
      }
  
      public List<Message> getMessages() {
  //      return Collections.unmodifiableList(messages); // issues with xstream
          return messages;
      }
  
      public void addAll(List<Message> remoteMessages) {
          messages.addAll(remoteMessages);
      }
  
      @Override
      public String toString() {
          StringBuilder builder = new StringBuilder();
          for (Message message : messages) {
              builder.append(message);
              builder.append("\n");
          }
          return builder.toString();
      }
  }