ApiError.java

/*
 * Copyright 2019 Global Crop Diversity Trust
 *
 * 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.gringlobal.api;

import org.apache.commons.lang3.StringUtils;
import org.genesys.blocks.model.JsonViews;

import com.fasterxml.jackson.annotation.JsonView;

/**
 * The Class ApiError.
 *
 * @param <T> the generic type
 */
public class ApiError<T extends Throwable> {
	@JsonView(JsonViews.Public.class)
	private final String error;
	@JsonView(JsonViews.Public.class)
	private final String localizedError;

	/**
	 * Instantiates a new api error.
	 *
	 * @param ex the ex
	 */
	public ApiError(final T ex) {
		this.error = makeMessage(ex);
		this.localizedError = ex.getLocalizedMessage();
	}

	/**
	 * Collect exception messages
	 *
	 * @param ex
	 * @return all exception messages
	 */
	private String makeMessage(Throwable ex) {
		final StringBuilder sb = new StringBuilder();
		while (ex != null) {
			if (StringUtils.isBlank(ex.getMessage())) {
				sb.insert(0, ex.getClass().getSimpleName());
			} else {
				sb.insert(0, ex.getMessage());
			}
			ex = ex.getCause();
			if (ex != null) {
				sb.insert(0, '\n');
			}
		}
		return sb.toString();
	}

	/**
	 * Gets the error.
	 *
	 * @return the error
	 */
	public String getError() {
		return error;
	}

	/**
	 * Gets the localized error.
	 *
	 * @return the localized error
	 */
	public String getLocalizedError() {
		return localizedError;
	}
}