io.kroxylicious.proxy.config.PluginAnnotationIntrospector Maven / Gradle / Ivy
/*
* Copyright Kroxylicious Authors.
*
* Licensed under the Apache Software License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
*/
package io.kroxylicious.proxy.config;
import java.lang.annotation.Annotation;
import com.fasterxml.jackson.annotation.JsonTypeInfo;
import com.fasterxml.jackson.annotation.OptBoolean;
import com.fasterxml.jackson.databind.annotation.JsonTypeIdResolver;
import com.fasterxml.jackson.databind.introspect.Annotated;
import com.fasterxml.jackson.databind.introspect.JacksonAnnotationIntrospector;
import com.fasterxml.jackson.databind.jsontype.TypeIdResolver;
import io.kroxylicious.proxy.plugin.PluginImplConfig;
class PluginAnnotationIntrospector extends JacksonAnnotationIntrospector {
@Override
protected A _findAnnotation(Annotated ann,
Class annoClass) {
if (annoClass == JsonTypeIdResolver.class) {
var pc = _findAnnotation(ann, PluginImplConfig.class);
if (pc != null) {
return (A) synthesizeJsonTypeIdResolver();
}
}
else if (annoClass == JsonTypeInfo.class) {
var pc = _findAnnotation(ann, PluginImplConfig.class);
if (pc != null) {
return (A) synthesizeJsonTypeInfo(pc);
}
}
return super._findAnnotation(ann, annoClass);
}
/**
* Returns a fake (i.e. not obtained through reflection)
* JsonTypeInfo instance which looks like this:
* {@code
* @JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.EXTERNAL_PROPERTY, property = "type")
* }
* where "type" is taken from the {@link PluginImplConfig#implNameProperty()}.
* @param pc The plugin config annotation
* @return The fake annotation instance
*/
private static JsonTypeInfo synthesizeJsonTypeInfo(PluginImplConfig pc) {
return new JsonTypeInfo() {
@Override
public Class annotationType() {
return JsonTypeInfo.class;
}
@Override
public Id use() {
return Id.NAME;
}
@Override
public As include() {
return As.EXTERNAL_PROPERTY;
}
@Override
public String property() {
return pc.implNameProperty();
}
@Override
public Class defaultImpl() {
return JsonTypeInfo.class;
}
@Override
public boolean visible() {
return false;
}
@Override
public OptBoolean requireTypeIdForSubtypes() {
return OptBoolean.DEFAULT;
}
};
}
/**
* Returns a fake (i.e. not obtained through reflection)
* JsonTypeIdResolver instance which looks like this:
* {@code
* @JsonTypeIdResolver(FilterConfigTypeIdResolver.class)
* }
* The {@link io.kroxylicious.proxy.config.ConfigParser}'s HandlerInstantiator will be responsible for instantiating this,
* passing it the plugin manager to use to look up the plugin named
* by the id in the synthetic @JsonTypeInfo returned by {@link #synthesizeJsonTypeInfo(PluginImplConfig)}
* @return The annotation instance.
*/
private static JsonTypeIdResolver synthesizeJsonTypeIdResolver() {
return new JsonTypeIdResolver() {
@Override
public Class annotationType() {
return JsonTypeIdResolver.class;
}
@Override
public Class value() {
return PluginConfigTypeIdResolver.class;
}
};
}
}