/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* 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
* 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.apache.isis.viewer.restfulobjects.server;
import java.util.List;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.Response.ResponseBuilder;
import javax.ws.rs.ext.ExceptionMapper;
import javax.ws.rs.ext.Provider;
import com.google.common.collect.Lists;
import org.jboss.resteasy.spi.Failure;
import org.apache.isis.core.commons.exceptions.ExceptionUtils;
import org.apache.isis.viewer.restfulobjects.applib.RestfulMediaType;
import org.apache.isis.viewer.restfulobjects.applib.client.RestfulResponse.HttpStatusCode;
import org.apache.isis.viewer.restfulobjects.applib.util.JsonMapper;
@Provider
public class RuntimeExceptionMapper implements ExceptionMapper<RuntimeException> {
@Override
public Response toResponse(final RuntimeException ex) {
HttpStatusCode statusCode = HttpStatusCode.INTERNAL_SERVER_ERROR;
if(ex instanceof Failure) {
Failure failure = (Failure) ex;
statusCode = HttpStatusCode.statusFor(failure.getErrorCode());
}
final ResponseBuilder builder = Response.status(statusCode.getJaxrsStatusType()).type(RestfulMediaType.APPLICATION_JSON_ERROR).entity(jsonFor(ex));
return builder.build();
}
private static class ExceptionPojo {
public static ExceptionPojo create(final Exception ex) {
return new ExceptionPojo(ex);
}
private static String format(final StackTraceElement stackTraceElement) {
return stackTraceElement.toString();
}
private final String message;
private final List<String> stackTrace = Lists.newArrayList();
private ExceptionPojo causedBy;
public ExceptionPojo(final Throwable ex) {
this.message = messageFor(ex);
final StackTraceElement[] stackTraceElements = ex.getStackTrace();
for (final StackTraceElement stackTraceElement : stackTraceElements) {
this.stackTrace.add(format(stackTraceElement));
}
final Throwable cause = ex.getCause();
if (cause != null && cause != ex) {
this.causedBy = new ExceptionPojo(cause);
}
}
private static String messageFor(final Throwable ex) {
final String message = ex.getMessage();
return message != null ? message : ex.getClass().getName();
}
@SuppressWarnings("unused")
public String getMessage() {
return message;
}
@SuppressWarnings("unused")
public List<String> getStackTrace() {
return stackTrace;
}
@SuppressWarnings("unused")
public ExceptionPojo getCausedBy() {
return causedBy;
}
}
static String jsonFor(final Exception ex) {
try {
return JsonMapper.instance().write(ExceptionPojo.create(ex));
} catch (final Exception e) {
// fallback
return "{ \"exception\": \"" + ExceptionUtils.getFullStackTrace(ex) + "\" }";
}
}
}