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https://issues.apache.org/jira/browse/CAMEL-5618?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Willem Jiang reassigned CAMEL-5618:
-----------------------------------
Assignee: Willem Jiang
> The tag "contextScan" should inject @Converter methods from @Converter
> components.
> ----------------------------------------------------------------------------------
>
> Key: CAMEL-5618
> URL: https://issues.apache.org/jira/browse/CAMEL-5618
> Project: Camel
> Issue Type: Improvement
> Components: camel-core, camel-spring
> Affects Versions: 2.10.1
> Reporter: Bernardo Silva
> Assignee: Willem Jiang
> Attachments: CamelConverterInjector.java
>
>
> The ability to detect converters using
> "META-INF/services/org/apache/camel/TypeConverter" SPI is cool, but obligates
> me to make my converters as static methods.
> This brings me 2 major issues:
> 1) It is hard to "mock" the converters in the "CamelTestSupport" because he
> auto-detect the "real" ones;
> 2) If I want to "inject" beans in my converter class and use it in my
> converter method, I can't.
> So, to solve my problem I did a very simple class. I will copy the code at
> the end of this. With this class, I don't use Camel SPI anymore and Spring
> injects the converters for me using "TypeConverterSupport".
> Then, my suggestion is: why the annotation "contextScan" doesn't have a
> similar behavior? It would be very nice and simple.
> Thanks,
> Bernardo Silva
> CLASS:
> import java.lang.reflect.Method;
> import java.util.Map;
> import org.apache.camel.CamelContext;
> import org.apache.camel.Converter;
> import org.apache.camel.Exchange;
> import org.apache.camel.TypeConversionException;
> import org.apache.camel.support.TypeConverterSupport;
> import org.springframework.beans.factory.InitializingBean;
> import org.springframework.beans.factory.annotation.Autowired;
> import org.springframework.context.ApplicationContext;
> import org.springframework.stereotype.Component;
> @SuppressWarnings("unchecked")
> @Component
> public class CamelConverterInjector implements InitializingBean {
> @Autowired
> private CamelContext camelContext;
> @Autowired
> private ApplicationContext springContext;
> private static abstract class TypeConverterWrapper extends
> TypeConverterSupport {
> protected final Method method;
> protected final Object bean;
> protected TypeConverterWrapper(Method method, Object bean) {
> this.method = method;
> this.bean = bean;
> }
> }
> private static final class TypeConverterSimpleWrapper extends
> TypeConverterWrapper {
> protected TypeConverterSimpleWrapper(Method method, Object
> bean) {
> super(method, bean);
> }
> public <T> T convertTo(Class<T> type, Exchange exchange, Object
> value) throws TypeConversionException {
> try {
> return (T) method.invoke(bean, value);
> } catch (Throwable t) {
> throw new TypeConversionException(value, type,
> t);
> }
> }
> }
> private static final class TypeConverterExchangeWrapper extends
> TypeConverterWrapper {
> protected TypeConverterExchangeWrapper(Method method, Object
> bean) {
> super(method, bean);
> }
> public <T> T convertTo(Class<T> type, Exchange exchange, Object
> value) throws TypeConversionException {
> try {
> return (T) method.invoke(bean, value, exchange);
> } catch (Throwable t) {
> throw new TypeConversionException(value, type,
> t);
> }
> }
> }
> public void afterPropertiesSet() throws Exception {
> final Map<String, Object> beans =
> springContext.getBeansWithAnnotation(Converter.class);
> for (String beanName : beans.keySet()) {
> final Object bean = beans.get(beanName);
> for (Method method : bean.getClass().getMethods()) {
> if (method.getAnnotation(Converter.class) !=
> null) {
> final Class<?>[] parameterTypes =
> method.getParameterTypes();
> final TypeConverterWrapper converter;
> if (parameterTypes.length == 1) {
> converter = new
> TypeConverterSimpleWrapper(method, bean);
> } else {
> converter = new
> TypeConverterExchangeWrapper(method, bean);
> }
>
> camelContext.getTypeConverterRegistry().addTypeConverter(method.getReturnType(),
> parameterTypes[0], converter);
> }
> }
> }
> }
> }
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