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

Go to download

Show more of this group Show more artifacts with this name
Show all versions of ads-lib Show documentation

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.

There is a newer version: 5.7.0

Show newest version

// Copyright 2010 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.base.Preconditions;

import org.apache.commons.beanutils.PropertyUtils;

import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;

/**
 * A utility class for handling choice objects.
 *
 * @author Adam Rogal
 */
public final class Choices {

  /**
   * Default constructor.
   */
  private Choices() {}

  /**
   * Gets the value of the choice object without having to inspect each
   * field. Returns {@code null} if no non-null fields are found.
   *
   * @param obj the choice object to get the value from
   * @return the value of the choice
   * @throws IllegalArgumentException if {@code obj == null}
   */
  public static Object getValue(Object obj)
      throws IllegalArgumentException, IllegalAccessException {
    Preconditions.checkNotNull(obj, "Choice object cannot be null.");

    Field[] fields = obj.getClass().getDeclaredFields();
    for (Field field : fields) {
      if (!(field.getName().equals("typeDesc") || field.getName().startsWith("__"))) {
        try {
          Object value = PropertyUtils.getProperty(obj, field.getName());
          if (value != null) {
            return value;
          }
        } catch (InvocationTargetException e) {
          continue;
        } catch (NoSuchMethodException e) {
          continue;
        }
      }
    }
    return null;
  }
}