本文整理了Java中org.springframework.integration.support.AbstractIntegrationMessageBuilder.setHeaderIfAbsent()方法的一些代码示例，展示了AbstractIntegrationMessageBuilder.setHeaderIfAbsent()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。AbstractIntegrationMessageBuilder.setHeaderIfAbsent()方法的具体详情如下：
包路径：org.springframework.integration.support.AbstractIntegrationMessageBuilder
类名称：AbstractIntegrationMessageBuilder
方法名：setHeaderIfAbsent

AbstractIntegrationMessageBuilder.setHeaderIfAbsent介绍

[英]Set the value for the given header name only if the header name is not already associated with a value.
[中]仅当标头名称尚未与值关联时，才为给定标头名称设置值。

代码示例

代码示例来源：origin: spring-projects/spring-integration

@Override
public final Message<?> transform(Message<?> message) {
  try {
    Assert.notNull(message, "Message must not be null");
    Object payload = message.getPayload();
    Assert.notNull(payload, "Message payload must not be null");
    Assert.isInstanceOf(File.class, payload, "Message payload must be of type [java.io.File]");
    File file = (File) payload;
    T result = this.transformFile(file);
    Message<?> transformedMessage = getMessageBuilderFactory().withPayload(result)
        .copyHeaders(message.getHeaders())
        .setHeaderIfAbsent(FileHeaders.ORIGINAL_FILE, file)
        .setHeaderIfAbsent(FileHeaders.FILENAME, file.getName())
        .build();
    if (this.deleteFiles) {
      if (!file.delete() && this.logger.isWarnEnabled()) {
        this.logger.warn("failed to delete File '" + file + "'");
      }
    }
    return transformedMessage;
  }
  catch (Exception e) {
    throw new MessagingException(message, "failed to transform File Message", e);
  }
}

代码示例来源：origin: spring-projects/spring-integration-aws

@Override
protected void additionalOnSuccessHeaders(AbstractIntegrationMessageBuilder<?> messageBuilder,
    AmazonWebServiceRequest request, Object result) {
  if (result instanceof SendMessageResult) {
    SendMessageResult sendMessageResult = (SendMessageResult) result;
    messageBuilder.setHeaderIfAbsent(AwsHeaders.MESSAGE_ID, sendMessageResult.getMessageId());
    messageBuilder.setHeaderIfAbsent(AwsHeaders.SEQUENCE_NUMBER, sendMessageResult.getSequenceNumber());
  }
}

代码示例来源：origin: org.springframework.integration/spring-integration-aws

@Override
protected void additionalOnSuccessHeaders(AbstractIntegrationMessageBuilder<?> messageBuilder,
    AmazonWebServiceRequest request, Object result) {
  if (result instanceof SendMessageResult) {
    SendMessageResult sendMessageResult = (SendMessageResult) result;
    messageBuilder.setHeaderIfAbsent(AwsHeaders.MESSAGE_ID, sendMessageResult.getMessageId());
    messageBuilder.setHeaderIfAbsent(AwsHeaders.SEQUENCE_NUMBER, sendMessageResult.getSequenceNumber());
  }
}

代码示例来源：origin: spring-projects/spring-integration-aws

@Override
@SuppressWarnings("unchecked")
public void onSuccess(I request, O result) {
  if (getAsyncHandler() != null) {
    ((AsyncHandler<I, O>) getAsyncHandler()).onSuccess(request, result);
  }
  if (getOutputChannel() != null) {
    AbstractIntegrationMessageBuilder<?> messageBuilder =
        getMessageBuilderFactory()
            .fromMessage(message);
    additionalOnSuccessHeaders(messageBuilder, request, result);
    messageBuilder.setHeaderIfAbsent(AwsHeaders.SERVICE_RESULT, result);
    AbstractAwsMessageHandler.this.messagingTemplate.send(getOutputChannel(), messageBuilder.build());
  }
}

代码示例来源：origin: org.springframework.integration/spring-integration-aws

@Override
@SuppressWarnings("unchecked")
public void onSuccess(I request, O result) {
  if (getAsyncHandler() != null) {
    ((AsyncHandler<I, O>) getAsyncHandler()).onSuccess(request, result);
  }
  if (getOutputChannel() != null) {
    AbstractIntegrationMessageBuilder<?> messageBuilder =
        getMessageBuilderFactory()
            .fromMessage(message);
    additionalOnSuccessHeaders(messageBuilder, request, result);
    messageBuilder.setHeaderIfAbsent(AwsHeaders.SERVICE_RESULT, result);
    AbstractAwsMessageHandler.this.messagingTemplate.send(getOutputChannel(), messageBuilder.build());
  }
}