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Java library for interacting with the Digipost REST API
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/*
 * Copyright (C) Posten Norge AS
 *
 * 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 no.digipost.api.client.errorhandling;

import no.digipost.api.client.representations.ErrorMessage;
import no.digipost.api.client.representations.Link;
import no.digipost.api.client.representations.Relation;
import org.apache.commons.lang3.exception.ExceptionUtils;

import java.util.List;

import static java.util.Arrays.asList;
import static no.digipost.api.client.errorhandling.ErrorCode.GENERAL_ERROR;
import static no.digipost.api.client.errorhandling.ErrorType.NONE;
import static no.digipost.api.client.errorhandling.ErrorType.UNKNOWN;
import static no.digipost.api.client.errorhandling.ErrorType.resolve;

public class DigipostClientException extends RuntimeException {
    private static final long serialVersionUID = 1L;

    private final ErrorCode errorCode;
    private final List links;
    private final ErrorType errorType;
    private final String errorMessage;

    public static DigipostClientException from(Throwable e) {
        return e instanceof DigipostClientException ? (DigipostClientException) e : new DigipostClientException(ErrorCode.resolve(e), e);
    }

    public DigipostClientException(ErrorMessage error) {
        this(ErrorCode.resolve(error.getErrorCode()), resolve(error.getErrorType()), getMessage(error), error.getLink(), null);
    }

    public DigipostClientException(ErrorCode code, Throwable cause) {
        this(code, NONE, getMessage(cause), cause);
    }

    public DigipostClientException(ErrorCode code, String message) {
        this(code, NONE, message, null);
    }

    public DigipostClientException(ErrorCode code, String message, Throwable cause) {
        this(code, NONE, message, cause);
    }

    private DigipostClientException(ErrorCode code, ErrorType errorTypeFromServer, String message, Throwable cause) { this(code, errorTypeFromServer, message, null, cause); }

    private DigipostClientException(ErrorCode code, ErrorType errorTypeFromServer, String message, List links, Throwable cause) {
        super(code == GENERAL_ERROR ? message : code + ": " + message, cause);
        this.errorCode = code;
        this.links = links;
        this.errorType = code.getOverriddenErrorType() == UNKNOWN ? errorTypeFromServer : code.getOverriddenErrorType();
        this.errorMessage = message;
    }

    public boolean isOneOf(ErrorCode ... codes) {
        return isOneOf(asList(codes));
    }

    public boolean isOneOf(Iterable codes) {
        for (ErrorCode code : codes) {
            if (code == errorCode) {
                return true;
            }
        }
        return false;
    }

    public ErrorCode getErrorCode() {
        return errorCode;
    }

    public String getErrorMessage() {
        return errorMessage;
    }

    public ErrorType getErrorType() {
        return errorType;
    }

    public Link getLink(Relation relation) {
        for (Link link : links) {
            if (link.equalsRelation(relation)) {
                return link;
            }
        }
        return null;
    }

    private static String getMessage(Throwable t) {
        Throwable rootCause = ExceptionUtils.getRootCause(t);
        return rootCause != null ? rootCause.getClass().getName() + ": " + rootCause.getMessage() : null;
    }

    private static String getMessage(ErrorMessage error) {
        String prefix = "";
        if (!ErrorCode.isKnown(error.getErrorCode())) {
            prefix = String.format("(Server errorcode %s:%s) ", error.getErrorType(), error.getErrorCode());
        }
        return prefix + error.getErrorMessage();
    }

}