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    • net.codestory.http.routes.ReflectionRoute Maven / Gradle / Ivy

    /**
 * Copyright (C) 2013 [email protected]
 *
 * 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
 */
package net.codestory.http.routes;

import java.lang.reflect.*;
import java.util.function.*;

import net.codestory.http.*;
import net.codestory.http.annotations.*;
import net.codestory.http.convert.*;
import net.codestory.http.payload.*;

class ReflectionRoute implements AnyRoute {
  private final Supplier resource;
  private final Method method;

  ReflectionRoute(Supplier resource, Method method) {
    this.resource = resource;
    this.method = method;
  }

  @Override
  public Object body(Context context, String[] pathParameters) {
    try {
      Object target = resource.get();

      Object[] arguments = convert(context, pathParameters, method.getGenericParameterTypes());
      Object response = invoke(target, method, arguments);
      Object body = emptyIfNull(response);
      String contentType = findContentType(method);

      Payload payload = new Payload(contentType, body);
      setCorsHeaders(payload);

      return payload;
    } catch (RuntimeException e) {
      throw e;
    } catch (Throwable e) {
      throw new IllegalStateException("Unable to apply route", e);
    }
  }

  private void setCorsHeaders(Payload finalPayload) {
    AllowOrigin origin = method.getDeclaredAnnotation(AllowOrigin.class);
    if (origin != null) {
      finalPayload.withAllowOrigin(origin.value());
    }

    AllowMethods methods = method.getDeclaredAnnotation(AllowMethods.class);
    if (methods != null) {
      finalPayload.withAllowMethods(methods.value());
    }

    AllowCredentials credentials = method.getDeclaredAnnotation(AllowCredentials.class);
    if (credentials != null) {
      finalPayload.withAllowCredentials(credentials.value());
    }

    AllowHeaders allowedHeaders = method.getDeclaredAnnotation(AllowHeaders.class);
    if (allowedHeaders != null) {
      finalPayload.withAllowHeaders(allowedHeaders.value());
    }

    ExposeHeaders exposedHeaders = method.getDeclaredAnnotation(ExposeHeaders.class);
    if (exposedHeaders != null) {
      finalPayload.withExposeHeaders(exposedHeaders.value());
    }

    MaxAge maxAge = method.getDeclaredAnnotation(MaxAge.class);
    if (maxAge != null) {
      finalPayload.withMaxAge(maxAge.value());
    }
  }

  static Object[] convert(Context context, String[] pathParameters, Type... types) {
    Object[] converted = new Object[types.length];

    // String parameters
    for (int i = 0; i < pathParameters.length; i++) {
      converted[i] = TypeConvert.convertValue(pathParameters[i], types[i]);
    }

    // Other parameters
    for (int i = pathParameters.length; i < converted.length; i++) {
      converted[i] = context.extract(types[i]);
    }

    return converted;
  }

  private static Object invoke(Object target, Method method, Object[] arguments) throws Throwable {
    try {
      method.setAccessible(true);
      return method.invoke(target, arguments);
    } catch (InvocationTargetException e) {
      throw e.getCause();
    }
  }

  private static Object emptyIfNull(Object payload) {
    return (payload == null) ? "" : payload;
  }

  private static String findContentType(Method method) {
    Produces annotation = method.getAnnotation(Produces.class);
    return (annotation == null) ? null : annotation.value();
  }
}
    
    
    
    

    




    
    
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