// Copyright 2012 Google Inc. All Rights Reserved.
//
// 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.eclipse.che.ide.util;
import org.eclipse.che.ide.commons.exception.ServerException;
import java.util.Collections;
import java.util.Map;
/** Utility class for common Exception related operations. */
public class ExceptionUtils {
public static final int MAX_CAUSE = 10;
public static String getStackTraceAsString(Throwable e) {
return getThrowableAsString(e, "\n", "\t");
}
public static String getThrowableAsString(Throwable e, String newline, String indent) {
if (e == null) {
return "";
}
// For each cause, print the requested number of entries of its stack
// trace, being careful to avoid getting stuck in an infinite loop.
StringBuilder s = new StringBuilder(newline);
Throwable currentCause = e;
String causedBy = "";
int causeCounter = 0;
for (; causeCounter < MAX_CAUSE && currentCause != null; causeCounter++) {
s.append(causedBy);
causedBy = newline + "Caused by: "; // after 1st, all say "caused by"
s.append(currentCause.getClass().getName());
s.append(": ");
s.append(currentCause.getMessage());
StackTraceElement[] stackElems = currentCause.getStackTrace();
if (stackElems != null) {
for (StackTraceElement stackElem : stackElems) {
s.append(newline);
s.append(indent);
s.append("at ");
s.append(stackElem.toString());
}
}
currentCause = currentCause.getCause();
}
if (causeCounter >= MAX_CAUSE) {
s.append(newline);
s.append(newline);
s.append("Exceeded the maximum number of causes.");
}
return s.toString();
}
/**
* Returns error code of the exception if it is of type {@link ServerException} and has error code set, or -1 otherwise.
*
* @param exception
* passed exception
* @return error code
*/
public static int getErrorCode(Throwable exception) {
if (exception instanceof ServerException) {
return ((ServerException)exception).getErrorCode();
} else if (exception instanceof org.eclipse.che.ide.websocket.rest.exceptions.ServerException) {
return ((org.eclipse.che.ide.websocket.rest.exceptions.ServerException)exception).getErrorCode();
} else {
return -1;
}
}
/**
* Returns attributes of the exception if it is of type {@link ServerException} and has attributes set, or empty map otherwise.
*
* @param exception
* passed exception
* @return error code
*/
public static Map<String, String> getAttributes(Throwable exception) {
if (exception instanceof ServerException) {
return ((ServerException)exception).getAttributes();
} else if (exception instanceof org.eclipse.che.ide.websocket.rest.exceptions.ServerException) {
return ((org.eclipse.che.ide.websocket.rest.exceptions.ServerException)exception).getAttributes();
} else {
return Collections.emptyMap();
}
}
/**
* Returns HTTP status the exception if it is of type {@link ServerException} or -1 otherwise.
*
* @param exception
* passed exception
* @return status code
*/
public static int getStatusCode(Throwable exception) {
if (exception instanceof ServerException) {
return ((ServerException)exception).getHTTPStatus();
} else if (exception instanceof org.eclipse.che.ide.websocket.rest.exceptions.ServerException) {
return ((org.eclipse.che.ide.websocket.rest.exceptions.ServerException)exception).getHTTPStatus();
} else {
return -1;
}
}
}