Java tutorial
/* * Copyright (c) 2006-20113Nuxeo SA (http://nuxeo.com/) and others. * * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * bstefanescu */ package org.nuxeo.ecm.automation.server.jaxrs; import java.io.PrintWriter; import java.io.StringWriter; import javax.servlet.http.HttpServletResponse; import javax.ws.rs.WebApplicationException; import javax.ws.rs.core.Response; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.nuxeo.ecm.automation.ConflictOperationException; import org.nuxeo.ecm.automation.InvalidOperationException; import org.nuxeo.ecm.automation.OperationNotFoundException; import org.nuxeo.ecm.core.api.ClientException; import org.nuxeo.ecm.core.api.DocumentSecurityException; import org.nuxeo.ecm.core.model.NoSuchDocumentException; /** * @author <a href="mailto:bs@nuxeo.com">Bogdan Stefanescu</a> */ public class ExceptionHandler { protected static final Log log = LogFactory.getLog(ExceptionHandler.class); protected int status = HttpServletResponse.SC_INTERNAL_SERVER_ERROR; protected String type; protected Throwable cause; protected String message; public static WebApplicationException newException(Throwable cause) { return newException(null, cause); } public static WebApplicationException newException(String message, Throwable cause) { if (cause == null) { throw new IllegalArgumentException("the cause parameter cannot be null"); } ExceptionHandler e = new ExceptionHandler(message, cause); return new WebApplicationException(cause, Response.status(e.getStatus()).entity(e).build()); } public static void abort(String message, Throwable cause) throws WebApplicationException { throw newException(message, cause); } public static void abort(Throwable cause) throws WebApplicationException { throw newException(null, cause); } /** * Tries to find the best matching HTTP status for the given exception. */ public static int getStatus(Throwable cause) { // use a max depth of 8 to avoid infinite loops for broken exceptions // which are referencing themselves as the cause return getStatus(cause, 8); } public static boolean isSecurityError(Throwable t) { return getStatus(t) == HttpServletResponse.SC_UNAUTHORIZED; } public static int getStatus(Throwable cause, int depth) { if (depth == 0) { log.warn("Possible infinite loop! Check the exception wrapping."); return HttpServletResponse.SC_INTERNAL_SERVER_ERROR; } if ((cause instanceof DocumentSecurityException) || (cause instanceof SecurityException) || "javax.ejb.EJBAccessException".equals(cause.getClass().getName())) { return HttpServletResponse.SC_FORBIDDEN; } else if (cause instanceof NoSuchDocumentException) { return HttpServletResponse.SC_NOT_FOUND; } else if (cause instanceof OperationNotFoundException) { return HttpServletResponse.SC_NOT_FOUND; } else if (cause instanceof ConflictOperationException) { return HttpServletResponse.SC_CONFLICT; } else if (cause instanceof InvalidOperationException) { return HttpServletResponse.SC_BAD_REQUEST; } Throwable parent = cause.getCause(); if (parent == cause) { log.warn("Infinite loop detected! Check the exception wrapping."); return HttpServletResponse.SC_INTERNAL_SERVER_ERROR; } if (parent != null) { return getStatus(parent, depth - 1); } if (cause.getMessage() != null && cause.getMessage().contains("org.nuxeo.ecm.core.model.NoSuchDocumentException")) { log.warn("Badly wrapped exception: found a NoSuchDocumentException" + " message but no NoSuchDocumentException", cause); return HttpServletResponse.SC_NOT_FOUND; } if (cause instanceof ClientException) { // Generic ClientException with no root cause return HttpServletResponse.SC_BAD_REQUEST; } return HttpServletResponse.SC_INTERNAL_SERVER_ERROR; } public ExceptionHandler(String message, Throwable cause) { if (cause == null) { throw new IllegalArgumentException("the cause parameter cannot be null"); } this.status = getStatus(cause); this.cause = cause; this.message = message == null ? cause.getMessage() : message; type = cause.getClass().getName(); } public int getStatus() { return status; } public String getType() { return cause.getClass().getName(); } public void setStatus(int status) { this.status = status; } public String getMessage() { return message; } public String getSerializedStackTrace() { StringWriter writer = new StringWriter(); PrintWriter pw = new PrintWriter(writer); cause.printStackTrace(pw); pw.flush(); return writer.toString(); } public Throwable getCause() { return cause; } }