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

Introduction

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

Prototype

public MessageBuilder<T> setHeaderIfAbsent(String headerName, Object headerValue) 

Source Link

Document

Set the value for the given header name only if the header name is not already associated with a value.

Usage

From source file:io.pivotal.poc.dispatcher.MessageDispatcher.java

private String sendMessage(String topic, Object body, HttpHeaders requestHeaders) {
    MessageChannel channel = resolver.resolveDestination(topic + ".input");
    MessageBuilder<?> builder = MessageBuilder.withPayload(body);
    builder.setHeader(MessageHeaders.CONTENT_TYPE, requestHeaders.getContentType());
    for (Map.Entry<String, List<String>> entry : requestHeaders.entrySet()) {
        String headerName = entry.getKey();
        if (requestHeadersToMap.contains(headerName)) {
            builder.setHeaderIfAbsent(headerName,
                    StringUtils.collectionToCommaDelimitedString(entry.getValue()));
        }//  ww  w  . ja  v  a 2  s.co m
    }
    Message<?> message = builder.build();
    channel.send(message);
    return message.getHeaders().getId().toString();
}

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From source file:org.springframework.messaging.converter.AbstractMessageConverter.java

@Override
@Nullable// w w w.  j a  v  a  2  s.  co m
public final Message<?> toMessage(Object payload, @Nullable MessageHeaders headers,
        @Nullable Object conversionHint) {
    if (!canConvertTo(payload, headers)) {
        return null;
    }

    Object payloadToUse = convertToInternal(payload, headers, conversionHint);
    if (payloadToUse == null) {
        return null;
    }

    MimeType mimeType = getDefaultContentType(payloadToUse);
    if (headers != null) {
        MessageHeaderAccessor accessor = MessageHeaderAccessor.getAccessor(headers,
                MessageHeaderAccessor.class);
        if (accessor != null && accessor.isMutable()) {
            if (mimeType != null) {
                accessor.setHeaderIfAbsent(MessageHeaders.CONTENT_TYPE, mimeType);
            }
            return MessageBuilder.createMessage(payloadToUse, accessor.getMessageHeaders());
        }
    }

    MessageBuilder<?> builder = MessageBuilder.withPayload(payloadToUse);
    if (headers != null) {
        builder.copyHeaders(headers);
    }
    if (mimeType != null) {
        builder.setHeaderIfAbsent(MessageHeaders.CONTENT_TYPE, mimeType);
    }
    return builder.build();
}

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From source file:org.springframework.messaging.support.converter.AbstractMessageConverter.java

@Override
public final Message<?> toMessage(Object payload, MessageHeaders headers) {
    if (!canConvertTo(payload, headers)) {
        return null;
    }//from www  .  ja va2s  .c o  m
    payload = convertToInternal(payload, headers);
    MessageBuilder<?> builder = MessageBuilder.withPayload(payload);
    if (headers != null) {
        builder.copyHeaders(headers);
    }
    MimeType mimeType = getDefaultContentType(payload);
    if (mimeType != null) {
        builder.setHeaderIfAbsent(MessageHeaders.CONTENT_TYPE, mimeType);
    }
    return builder.build();
}

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