com.google.api.ads.common.lib.utils.AdsUtilityInvocationHandler Maven / Gradle / Ivy

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Client library for Java for accessing ads APIs including DFP. If you want to use this library, you must also include another Maven artifact to specify which framework you would like to use it with. For example, to use DFP with Axis, you should include the "dfp-axis" artifact.

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// Copyright 2016 Google Inc. All Rights Reserved.
//
// 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 com.google.api.ads.common.lib.utils;

import com.google.common.reflect.AbstractInvocationHandler;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**
 * {@link InvocationHandler} that updates the {@link AdsUtilityRegistry} when a method call on the
 * proxied interface is annotated with {@link UsesAdsUtilities}.
 */
public class AdsUtilityInvocationHandler extends AbstractInvocationHandler {

  private final AdsUtilityRegistry adsUtilityRegistry;
  private final Object objectToProxy;

  public AdsUtilityInvocationHandler(Object objectToProxy, AdsUtilityRegistry adsUtilityRegistry) {
    this.adsUtilityRegistry = adsUtilityRegistry;
    this.objectToProxy = objectToProxy;
  }

  @Override
  public Object handleInvocation(Object proxy, Method method, Object[] args) throws Throwable {
    UsesAdsUtilities utilityAnnotation = method.getAnnotation(UsesAdsUtilities.class);
    if (utilityAnnotation != null && utilityAnnotation.value() != null) {
      for (AdsUtility utility : utilityAnnotation.value()) {
        this.adsUtilityRegistry.addUtility(utility);
      }
    }
    try {
      return method.invoke(objectToProxy, args);
    } catch (InvocationTargetException e) {
      if (e.getCause() != null) {
        throw e.getCause();
      }
      // An InvocationTargetException shouldn't have a null cause, but it's technically
      // possible since its constructors don't explicitly disallow null. In the unlikely
      // event that this happens, wrap the InvocationTargetException and throw it.
      throw new RuntimeException("Method invocation failed", e);
    }
  }
}