1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19 package org.apache.myfaces.view.facelets.el;
20
21 import javax.el.ELContext;
22 import javax.faces.context.FacesContext;
23
24 import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFWebConfigParam;
25 import org.apache.myfaces.shared.util.WebConfigParamUtils;
26
27 public class ContextAwareUtils
28 {
29 /**
30 * Wrap exception caused by calls to EL expressions, so information like
31 * the location, expression string and tag name can be retrieved by
32 * the ExceptionHandler implementation and used to output meaningful information about itself.
33 *
34 * <p>Note in some cases this will wrap the original javax.el.ELException, so the
35 * information will not be on the stack trace unless ExceptionHandler
36 * retrieve checking if the exception implements ContextAware interface and calling getWrapped() method.
37 * </p>
38 *
39 */
40 @JSFWebConfigParam(since="2.0.9, 2.1.3" , defaultValue="true", expectedValues="true, false")
41 public static final String INIT_PARAM_WRAP_TAG_EXCEPTIONS_AS_CONTEXT_AWARE
42 = "org.apache.myfaces.WRAP_TAG_EXCEPTIONS_AS_CONTEXT_AWARE";
43
44 public static boolean isWrapTagExceptionsAsContextAware(ELContext context)
45 {
46 FacesContext facesContext = (FacesContext) context.getContext(FacesContext.class);
47 facesContext = facesContext == null ? FacesContext.getCurrentInstance() : facesContext;
48 if (facesContext != null)
49 {
50 return WebConfigParamUtils.getBooleanInitParameter(facesContext.getExternalContext(),
51 INIT_PARAM_WRAP_TAG_EXCEPTIONS_AS_CONTEXT_AWARE, true);
52 }
53 else
54 {
55 //No facesContext, return false
56 return false;
57 }
58 }
59 }