EBusTelegramParser.java 文件源码

/**
 * Evaluates the compiled script of a entry.
 * @param entry The configuration entry to evaluate
 * @param scopeValues All known values for script scope
 * @return The computed value
 * @throws ScriptException
 */
private Object evaluateScript(Entry<String, Map<String, Object>> entry, Map<String, Object> scopeValues) throws ScriptException {

    Object value = null;

    // executes compiled script
    if(entry.getValue().containsKey("cscript")) {
        CompiledScript cscript = (CompiledScript) entry.getValue().get("cscript");

        // Add global variables thisValue and keyName to JavaScript context
        Bindings bindings = cscript.getEngine().createBindings();
        bindings.putAll(scopeValues);
        value = cscript.eval(bindings);
    }

    // try to convert the returned value to BigDecimal
    value = ObjectUtils.defaultIfNull(
            NumberUtils.toBigDecimal(value), value);

    // round to two digits, maybe not optimal for any result
    if(value instanceof BigDecimal) {
        ((BigDecimal)value).setScale(2, BigDecimal.ROUND_HALF_UP);
    }

    return value;
}