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package act.plugin;
/*-
* #%L
* ACT Framework
* %%
* Copyright (C) 2014 - 2018 ActFramework
* %%
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* #L%
*/
import act.app.ActionContext;
import act.controller.meta.ControllerClassMetaInfo;
import org.osgl.$;
import org.osgl.exception.NotAppliedException;
import org.osgl.http.H;
import org.osgl.mvc.result.Result;
import org.osgl.util.C;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
/**
* allows plugin different controller annotations framework, e.g. JAX-RS
*/
public abstract class ControllerPlugin implements Plugin {
public static final class PathAnnotationSpec {
private final Class<? extends Annotation> annoType;
private final boolean supportAbsolutePath;
private final boolean supportInheritance;
public PathAnnotationSpec(Class<? extends Annotation> annoType, boolean supportAbsolutePath, boolean supportInheritance) {
this.annoType = annoType;
this.supportAbsolutePath = supportAbsolutePath;
this.supportInheritance = supportInheritance;
}
public Class<? extends Annotation> annoType() {
return annoType;
}
public boolean supportAbsolutePath() {
return supportAbsolutePath;
}
public boolean supportInheritance() {
return supportInheritance;
}
}
protected abstract Map<Class<? extends Annotation>, H.Method> annotationMethodLookup();
protected abstract PathAnnotationSpec urlContextAnnotation();
protected abstract boolean noDefaultPath();
/**
* Returns function that takes {@link ActionContext} as parameter and returns a {@link Result}. If
* a non-null result is returned, then it will by pass the ActFramework handling process and return
* directly, in which case the plugin literally hijack the ActFramework handling process.
* <p>
* The plugin might also do some changes to `ActionContext` and return `null` value in which case
* ActFramework normal handling process still happens.
*
* @param controllerClass the controller class
* @param actionMethod the action method
* @return a logic to be injected before ActFramework handling request
*/
public $.Function<ActionContext, Result> beforeHandler(Class<?> controllerClass, Method actionMethod) {
return $.f1();
}
private static final $.Func2<Result, ActionContext, Result> DUMB_AFTER_HANDLER = new $.F2<Result, ActionContext, Result>() {
@Override
public Result apply(Result result, ActionContext context) throws NotAppliedException, $.Break {
return result;
}
};
/**
* Returns function that takes {@link Result} and {@link ActionContext} as parameter
* and returns a {@link Result}. This function is called after ActFramework's processing
* has finished.
* <p>
* The afterHandler allows plugin to inject logic to further process the returned result
* or do some updates to `ActionContext` for example to change the response content type
* etc.
* <p>
* The afterHandler shall always returns a result even if there is nothing to do with
* it, it must return the result passed in.
*
* @param controllerClass the controller class
* @param actionMethod the action method
* @return a logic to be injected before ActFramework handling request
*/
public $.Func2<Result, ActionContext, Result> afterHandler(Class<?> controllerClass, Method actionMethod) {
return DUMB_AFTER_HANDLER;
}
@Override
public void register() {
ControllerClassMetaInfo.registerMethodLookups(annotationMethodLookup(), noDefaultPath());
ControllerClassMetaInfo.registerUrlContextAnnotation(urlContextAnnotation());
Manager.INST.controllerPlugins.add(this);
}
public static class Manager extends ControllerPlugin {
public static final Manager INST = new Manager();
private List<ControllerPlugin> controllerPlugins = new ArrayList<>();
@Override
public $.Function<ActionContext, Result> beforeHandler(final Class<?> controllerClass, final Method actionMethod) {
int size = controllerPlugins.size();
switch (size) {
case 0:
return super.beforeHandler(controllerClass, actionMethod);
case 1:
return controllerPlugins.get(0).beforeHandler(controllerClass, actionMethod);
default:
return new $.Function<ActionContext, Result>() {
@Override
public Result apply(ActionContext context) throws NotAppliedException, $.Break {
for (ControllerPlugin plugin: controllerPlugins) {
Result result = plugin.beforeHandler(controllerClass, actionMethod).apply(context);
if (null != result) {
return result;
}
}
return null;
}
};
}
}
@Override
public $.Func2<Result, ActionContext, Result> afterHandler(final Class<?> controllerClass, final Method actionMethod) {
int size = controllerPlugins.size();
switch (size) {
case 0:
return super.afterHandler(controllerClass, actionMethod);
case 1:
return controllerPlugins.get(0).afterHandler(controllerClass, actionMethod);
default:
return new $.Func2<Result, ActionContext, Result>() {
@Override
public Result apply(Result result, ActionContext context) throws NotAppliedException, $.Break {
for (ControllerPlugin plugin: controllerPlugins) {
result = plugin.afterHandler(controllerClass, actionMethod).apply(result, context);
}
return result;
}
};
}
}
@Override
protected Map<Class<? extends Annotation>, H.Method> annotationMethodLookup() {
return C.Map();
}
@Override
protected PathAnnotationSpec urlContextAnnotation() {
return null;
}
@Override
protected boolean noDefaultPath() {
return false;
}
@Override
public void register() {
}
}
}