Examples with ExpressionAdapter org.apache.camel.support.ExpressionAdapter used on opensource projects

Example 21 with ExpressionAdapter

use of org.apache.camel.support.ExpressionAdapter in project camel by apache.

the class ExpressionBuilder method messageHistoryExpression.

/**
     * Returns the message history (including exchange details or not)
     */
public static Expression messageHistoryExpression(final boolean detailed) {
    return new ExpressionAdapter() {

        private ExchangeFormatter formatter;

        public Object evaluate(Exchange exchange) {
            ExchangeFormatter ef = null;
            if (detailed) {
                // use the exchange formatter to log exchange details
                ef = getOrCreateExchangeFormatter(exchange.getContext());
            }
            return MessageHelper.dumpMessageHistoryStacktrace(exchange, ef, false);
        }

        private ExchangeFormatter getOrCreateExchangeFormatter(CamelContext camelContext) {
            if (formatter == null) {
                Set<ExchangeFormatter> formatters = camelContext.getRegistry().findByType(ExchangeFormatter.class);
                if (formatters != null && formatters.size() == 1) {
                    formatter = formatters.iterator().next();
                } else {
                    // setup exchange formatter to be used for message history dump
                    DefaultExchangeFormatter def = new DefaultExchangeFormatter();
                    def.setShowExchangeId(true);
                    def.setMultiline(true);
                    def.setShowHeaders(true);
                    def.setStyle(DefaultExchangeFormatter.OutputStyle.Fixed);
                    try {
                        Integer maxChars = CamelContextHelper.parseInteger(camelContext, camelContext.getGlobalOption(Exchange.LOG_DEBUG_BODY_MAX_CHARS));
                        if (maxChars != null) {
                            def.setMaxChars(maxChars);
                        }
                    } catch (Exception e) {
                        throw ObjectHelper.wrapRuntimeCamelException(e);
                    }
                    formatter = def;
                }
            }
            return formatter;
        }

        @Override
        public String toString() {
            return "messageHistory(" + detailed + ")";
        }
    };
}