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True-OOP Java client for finAPI

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/*
 * Copyright 2018 Roman Proshin
 *
 * 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 org.proshin.finapi.accesstoken;

import java.util.Optional;
import org.json.JSONObject;
import org.proshin.finapi.exception.NoFieldException;
import org.proshin.finapi.primitives.optional.OptionalOf;

public final class UserAccessToken implements AccessToken {

    private final JSONObject origin;

    public UserAccessToken(final JSONObject origin) {
        this.origin = origin;
    }

    @Override
    public String accessToken() {
        return this.origin.getString("access_token");
    }

    @Override
    public String tokenType() {
        return this.origin.getString("token_type");
    }

    @Override
    public Optional refreshToken() {
        final String name = "refresh_token";
        if (this.origin.isNull(name)) {
            throw new NoFieldException("Field 'refresh_token' may not be null for user's access token");
        } else {
            return new OptionalOf<>(this.origin, name, JSONObject::getString).get();
        }
    }

    @Override
    public int expiresIn() {
        return this.origin.getInt("expires_in");
    }

    @Override
    public String scope() {
        return this.origin.getString("scope");
    }
}