Example usage for org.springframework.messaging.support MessageBuilder copyHeadersIfAbsent

Introduction

In this page you can find the example usage for org.springframework.messaging.support MessageBuilder copyHeadersIfAbsent.

Prototype

public MessageBuilder<T> copyHeadersIfAbsent(@Nullable Map<String, ?> headersToCopy) 

Source Link

Document

Copy the name-value pairs from the provided Map.

Usage

From source file:com.kinglcc.spring.jms.core.Jackson2PayloadArgumentResolver.java

@Override
public Object resolveArgument(MethodParameter parameter, Message<?> message) throws Exception {
    Payload ann = parameter.getParameterAnnotation(Payload.class);
    if (ann != null && StringUtils.hasText(ann.value())) {
        throw new IllegalStateException("@Payload SpEL expressions not supported by this resolver");
    }//from  w  w w.j av a  2s  .c o  m

    Object payload = message.getPayload();
    boolean isGeneric = isGenericMessage(payload);
    if (isGeneric) {
        payload = ((GenericMessage) payload).getContent();
        MessageBuilder<Object> builder = MessageBuilder.withPayload(payload);
        message = builder.copyHeadersIfAbsent(message.getHeaders()).build();
    }
    if (isEmptyPayload(payload)) {
        if (ann == null || ann.required()) {
            bindEmptyPayloadError(parameter, message, payload);
        }
        return null;
    }

    if (isGeneric) {
        return convertFromMessage(parameter, message);
    } else {
        if (ClassUtils.isAssignable(parameter.getParameterType(), payload.getClass())) {
            validate(message, parameter, payload);
            return payload;
        }
        return convertFromMessage(parameter, message);
    }
}

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