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 * distributed with this work for additional information        *
 * regarding copyright ownership.  The ASF licenses this file   *
 * to you under the Apache License, Version 2.0 (the            *
 * "License"); you may not use this file except in compliance   *
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package org.apache.james.imap.decode;

import java.io.IOException;
import java.util.Objects;

import org.apache.james.imap.api.display.HumanReadableText;

/**
 * 
 * Indicates that decoding failured.
 * 
 * 
 * All decoding exception should be supplied with:
 * 
 * 
 * A finely grained descriptive string
 * A coursely grained key for i18n
 * 
 * 
 * The following keys are frequently used when decoding:
 * 
 * 
 * {@link HumanReadableText#ILLEGAL_ARGUMENTS}
 * {@link HumanReadableText#BAD_IO_ENCODING}
 * 
 */
public class DecodingException extends IOException {

    private static final long serialVersionUID = 8719349386686261422L;

    private final HumanReadableText key;

    private Throwable t;

    /**
     * Constructs a decoding exception
     * 
     * @param key
     *            coursely grained i18n, not null
     * @param s
     *            specific description suitable for logging, not null
     */
    public DecodingException(HumanReadableText key, String s) {
        super(s);
        this.key = key;
    }

    /**
     * Constructs a decoding exception.
     * 
     * @param key
     *            coursely grained i18n, not null
     * @param s
     *            specific description suitable for logging, not null
     * @param t
     *            cause, not null
     */
    public DecodingException(HumanReadableText key, String s, Throwable t) {
        super(s);
        this.key = key;
        this.t = t;
    }

    /**
     * Gets the message key.
     * 
     * @return the key, not null
     */
    public final HumanReadableText getKey() {
        // API specifies not null but best to default to generic message
        return Objects.requireNonNullElse(this.key, HumanReadableText.ILLEGAL_ARGUMENTS);
    }

    @Override
    public Throwable getCause() {
        return t;
    }

}