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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.processing.request;
/**
* An error encountered while processing a request.
* This can be subclassed to add error messages containing more information.
* <p>
* Error messages are immutable.
*
* @author bratseth
*/
public class ErrorMessage implements Cloneable {
private final int code;
private final String message;
private final String detailedMessage;
private final Throwable cause;
/**
* Creates an error
*
* @param message the textual message describing this condition tersely
*/
public ErrorMessage(String message) {
this(0, message, null, null);
}
/**
* Creates an error
*
* @param message the textual message describing this condition tersely
* @param code an error code. If this is bound to HTTP request/responses and
* this error code is a HTTP status code, this code will be returned as the HTTP status
*/
public ErrorMessage(int code, String message) {
this(code, message, null, null);
}
/**
* Creates an error
*
* @param message the textual message describing this condition tersely
* @param details a longer detail description of this condition
*/
public ErrorMessage(String message, String details) {
this(0, message, details, null);
}
/**
* Creates an error
*
* @param message the textual message describing this condition tersely
* @param code an error code. If this is bound to HTTP request/responses and
* this error code is a HTTP status code, this code will be returned as the HTTP status
* @param details a longer detail description of this condition
*/
public ErrorMessage(int code, String message, String details) {
this(code, message, details, null);
}
/**
* Creates an error
*
* @param message the textual message describing this condition tersely
* @param cause the cause of this error
*/
public ErrorMessage(String message, Throwable cause) {
this(0, message, null, cause);
}
/**
* Creates an error
*
* @param code an error code. If this is bound to HTTP request/responses and
* this error code is a HTTP status code, this code will be returned as the HTTP status
* @param message the textual message describing this condition tersely
* @param cause the cause of this error
*/
public ErrorMessage(int code, String message, Throwable cause) {
this(code, message, null, cause);
}
/**
* Creates an error
*
* @param message the textual message describing this condition tersely
* @param details a longer detail description of this condition
* @param cause the cause of this error
*/
public ErrorMessage(String message, String details, Throwable cause) {
this(0, message, details, cause);
}
/**
* Creates an error
*
* @param code an error code. If this is bound to HTTP request/responses and
* this error code is a HTTP status code, this code will be returned as the HTTP status
* @param message the textual message describing this condition tersely
* @param details a longer detail description of this condition
* @param cause the cause of this error
*/
public ErrorMessage(int code, String message, String details, Throwable cause) {
if (message == null) throw new NullPointerException("Message cannot be null");
this.code = code;
this.message = message;
this.detailedMessage = details;
this.cause = cause;
}
/**
* Returns the code of this message, or 0 if no code is set
*/
public int getCode() {
return code;
}
/**
* Returns the error message, never null
*/
public String getMessage() {
return message;
}
/**
* Returns detailed information about this error, or null if there is no detailed message
*/
public String getDetailedMessage() {
return detailedMessage;
}
/**
* Returns the throwable associated with this error, or null if none
*/
public Throwable getCause() {
return cause;
}
/**
* Returns a formatted message containing the information in this
*/
@Override
public String toString() {
if (code == 0 && detailedMessage == null && cause == null) return message; // shortcut
StringBuilder b = new StringBuilder();
if (code != 0)
b.append(code).append(": ");
b.append(message);
if (detailedMessage != null)
b.append(": ").append(detailedMessage);
if (cause != null)
append(cause, b);
return b.toString();
}
private void append(Throwable t, StringBuilder b) {
String lastMessage = null;
String message;
for (; t != null; t = t.getCause(), lastMessage = message) {
message = getMessage(t);
if (message == null) continue;
if (lastMessage != null && lastMessage.equals(message)) continue;
if (b.length() > 0)
b.append(": ");
b.append(message);
}
}
/**
* Returns a useful message from *this* exception, or null if none
*/
private static String getMessage(Throwable t) {
String message = t.getMessage();
if (t.getCause() == null) {
if (message == null) return t.getClass().getSimpleName();
} else {
if (message == null) return null;
if (message.equals(t.getCause().getClass().getName() + ": " + t.getCause().getMessage())) return null;
}
return message;
}
@Override
public int hashCode() {
return code * 7 + message.hashCode() + (detailedMessage == null ? 0 : 17 * detailedMessage.hashCode());
}
/**
* Two error messages are equal if they have the same code and message.
* The cause is ignored in the comparison.
*/
@Override
public boolean equals(Object o) {
if (!(o instanceof ErrorMessage)) return false;
ErrorMessage other = (ErrorMessage) o;
if (this.code != other.code) return false;
if (!this.message.equals(other.message)) return false;
if (this.detailedMessage == null) return other.detailedMessage == null;
if (other.detailedMessage == null) return false;
return this.detailedMessage.equals(other.detailedMessage);
}
@Override
public ErrorMessage clone() {
try {
return (ErrorMessage) super.clone();
} catch (CloneNotSupportedException e) {
throw new RuntimeException("Programming error");
}
}
}
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