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The Java Client library provides a native Java binding to the FusionAuth REST API.

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/*
 * Copyright (c) 2018, FusionAuth, 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 io.fusionauth.client;

import java.util.function.Supplier;

import com.inversoft.error.Errors;
import com.inversoft.rest.ClientResponse;

/**
 * This is a helper delegate that makes it simpler to invoke the {@link FusionAuthClient} methods and automatically deals
 * with the {@link ClientResponse} object for you.
 *
 * @author Brian Pontarelli
 */
public class ExceptionDelegate {
  public ExceptionDelegate() {
  }

  /**
   * Executes the delegated FusionAuthClient call using the given supplier (to make the API call) and handles the response
   * by returning the success response if the status code was 2xx. If the status code was 404, this returns null. For
   * all other status codes, this throws a {@link FusionAuthClientException}
   *
   * @param supplier The supplier that should invoke the FusionAuthClient method.
   * @param       The success response type.
   * @param       The error response type.
   * @return The success response type if the API call was successful.
   * @throws FusionAuthClientException If the status code was anything exception 2xx or 404 or there was a problem calling
   *                                 the API (network or something similar).
   */
  @SuppressWarnings("unchecked")
  public  T execute(Supplier> supplier) {
    ClientResponse response = supplier.get();
    if (response.wasSuccessful()) {
      return response.successResponse;
    } else if (response.status == 404) {
      return null;
    } else if (response.errorResponse != null && response.errorResponse instanceof Errors) {
      throw new FusionAuthClientException((Errors) response.errorResponse);
    } else if (response.errorResponse != null) {
      throw new FusionAuthClientException("Invalid error response type");
    } else if (response.exception != null) {
      throw new FusionAuthClientException(response.exception);
    } else {
      throw new FusionAuthClientException("ClientResponse didn't contain a error response or an exception - strange");
    }
  }
}