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API.AI Java SDK allows using voice commands and integration with dialog scenarios defined for a particular agent in API.AI.

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package ai.api.model;

/***********************************************************************************************************************
 *
 * API.AI Java SDK - client-side libraries for API.AI
 * =================================================
 *
 * Copyright (C) 2015 by Speaktoit, Inc. (https://www.speaktoit.com)
 * https://www.api.ai
 *
 ***********************************************************************************************************************
 *
 * 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.
 *
 ***********************************************************************************************************************/

import ai.api.AIServiceException;

import java.io.Serializable;

public class AIError implements Serializable {

	private static final long serialVersionUID = 1L;
	
    private final String message;
    @SuppressWarnings("unused")
	private final AIResponse aiResponse;

    private AIServiceException exception;

    public AIError(final String message) {
        aiResponse = null;

        this.message = message;
    }

    public AIError(final AIServiceException e) {
        aiResponse = e.getResponse();
        message = e.getMessage();
        exception = e;
    }

    public AIError(final AIResponse aiResponse) {
        this.aiResponse = aiResponse;

        if (aiResponse == null) {
            message = "API.AI service returns empty result";
        }
        else if (aiResponse.getStatus() != null) {
            message = aiResponse.getStatus().getErrorDetails();
        } else {
            message = "API.AI service returns error code with empty status";
        }
    }

    public String getMessage() {
        return message;
    }

    @Override
    public String toString() {
        if (exception != null) {
            return exception.toString();
        } else {
            return message;
        }
    }
}