package com.atlassian.messagequeue.internal.core;
   
   import java.util.Collections;
   import java.util.HashMap;
   import java.util.Map;
   
   /**
    * A message intended to be nested inside the payload of a SQS message.
    *
   * This class represents a deliberate intent to avoid using SQS message attributes. One reason is that some
   * external services can only produce SQS messages <em>without attributes</em> onto a SQS queue. For
   * compatibility with those services, AMQ will too eschew attributes.
   */
  public class NestedMessage {
      private Map<String, String> attributes = new HashMap<>();
      private String payload;
  
      public String getAttribute(String name) {
          return attributes.get(name);
      }
  
      public NestedMessage addAttribute(String name, String value) {
          attributes.put(name, value);
          return this;
      }
  
      Map<String, String> getAttributesClone() {
          return Collections.unmodifiableMap(attributes);
      }
  
      public String getPayload() {
          return payload;
      }
  
      public NestedMessage setPayload(String payload) {
          this.payload = payload;
          return this;
      }
  }