/* | |
* 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.empire.jsf2.pages; | |
import java.io.Serializable; | |
import java.lang.reflect.Method; | |
import java.sql.Connection; | |
import java.util.ArrayList; | |
import java.util.Iterator; | |
import java.util.List; | |
import java.util.Map; | |
import javax.faces.application.FacesMessage; | |
import javax.faces.application.NavigationHandler; | |
import javax.faces.context.ExternalContext; | |
import javax.faces.context.FacesContext; | |
import org.apache.empire.commons.StringUtils; | |
import org.apache.empire.db.DBDatabase; | |
import org.apache.empire.db.DBRowSet; | |
import org.apache.empire.exceptions.EmpireException; | |
import org.apache.empire.exceptions.InternalException; | |
import org.apache.empire.exceptions.ItemNotFoundException; | |
import org.apache.empire.exceptions.MiscellaneousErrorException; | |
import org.apache.empire.jsf2.app.FacesUtils; | |
import org.apache.empire.jsf2.app.TextResolver; | |
import org.apache.empire.jsf2.app.WebApplication; | |
import org.apache.empire.jsf2.utils.ParameterMap; | |
import org.slf4j.Logger; | |
import org.slf4j.LoggerFactory; | |
public abstract class Page implements Serializable | |
{ | |
private static final long serialVersionUID = 1L; | |
public static final String SESSION_MESSAGE = "PAGE_SESSION_MESSAGE"; | |
private static final Logger log = LoggerFactory.getLogger(Page.class); | |
private String action = null; | |
private boolean initialized = false; | |
private PageDefinition pageDefinition = null; | |
private List<PageElement> pageElements = null; | |
protected Page() | |
{ | |
if (log.isDebugEnabled()) | |
{ String name = this.getClass().getSimpleName(); | |
Page.log.debug("PageBean {} created.", name); | |
} | |
} | |
public String getPageName() | |
{ | |
return (pageDefinition != null ? pageDefinition.getPageBeanName() : "{" + getClass().getSimpleName() + "}"); | |
} | |
public String getName() | |
{ | |
String className = pageDefinition.getPageBeanClass().getName(); | |
int lastDot = className.lastIndexOf("."); | |
String name = className.substring(lastDot + 1); | |
return name; | |
} | |
public boolean isInitialized() | |
{ | |
return initialized; | |
} | |
public String getAction() | |
{ | |
if (this.action==null) | |
return null; | |
// Generate key | |
ParameterMap pm = FacesUtils.getParameterMap(FacesUtils.getContext()); | |
String actionParam = (pm!=null ? pm.encodeString(action) : action); | |
return actionParam; | |
} | |
public void setAction(String actionParam) | |
{ | |
if (!initialized) | |
Page.log.debug("Setting PageBean action {} for bean {}.", action, getPageName()); | |
else | |
Page.log.trace("Re-setting PageBeanAction {} for bean {}.", action, getPageName()); | |
// actionParam | |
if (StringUtils.isEmpty(actionParam)) | |
return; | |
// Set action from param | |
this.action = PageDefinition.decodeActionParam(actionParam); | |
if (this.action==null) | |
throw new ItemNotFoundException(actionParam); | |
} | |
public PageDefinition getPageDefinition() | |
{ | |
return pageDefinition; | |
} | |
public void setPageDefinition(PageDefinition pageDefinition) | |
{ | |
this.pageDefinition = pageDefinition; | |
} | |
public PageDefinition getParentPage() | |
{ | |
return pageDefinition.getParent(); | |
} | |
public void preRenderPage(FacesContext context) | |
{ | |
if (this.initialized) | |
{ | |
// PageBean.log.error("PageBean {} is already initialized.", name()); | |
try | |
{ | |
Page.log.debug("PageBean {} is already initialized. Calling doRefresh().", getPageName()); | |
doRefresh(); | |
} | |
catch (Exception e) | |
{ | |
logAndHandleActionException("doRefresh", e); | |
} | |
return; // already Initialized | |
} | |
// Check access | |
try | |
{ | |
checkPageAccess(); | |
// redirected? | |
if (context.getResponseComplete()) | |
return; | |
} | |
catch (Exception e) | |
{ | |
logAndHandleActionException("checkAccess", e); | |
// redirected? | |
if (context.getResponseComplete()) | |
return; | |
// Oops, not redirected yet? | |
if (getParentPage()!=null) | |
navigateTo(getParentOutcome(true)); | |
// Done | |
return; | |
} | |
// Initialize | |
this.initialized = true; | |
// String value of "null"? | |
if (this.action!=null && "null".equals(this.action)) | |
{ log.warn("Invalid action name 'null' for {}", getClass().getName()); | |
this.action = null; | |
} | |
// Execute Action | |
if (this.action != null) | |
{ try | |
{ // Process action | |
log.info("Processing action {} on {}.", String.valueOf(action), getPageName()); | |
Method method = getClass().getMethod(action); | |
Object result = method.invoke(this); | |
if (result != null) | |
{ | |
String outcome = result.toString(); | |
// Retrieve the NavigationHandler instance.. | |
NavigationHandler navHandler = context.getApplication().getNavigationHandler(); | |
// Invoke nav handling.. | |
navHandler.handleNavigation(context, action, outcome); | |
// Trigger a switch to Render Response if needed | |
context.renderResponse(); | |
return; | |
} | |
restoreSessionMessage(); | |
} | |
catch (NoSuchMethodException nsme) | |
{ | |
logAndHandleActionException(action, nsme); | |
} | |
catch (Exception e) | |
{ | |
logAndHandleActionException(action, e.getCause()); | |
} | |
finally | |
{ | |
// Clear action | |
this.action = null; // Page.INVALID_ACTION; | |
} | |
} | |
else | |
{ // call default Action | |
try | |
{ | |
Page.log.debug("Initializing PageBean {}. Calling doInit()", getPageName()); | |
doInit(); | |
restoreSessionMessage(); | |
} | |
catch (Exception e) | |
{ | |
logAndHandleActionException("doInit", e); | |
} | |
} | |
} | |
public boolean isHasMessages() | |
{ | |
Iterator<FacesMessage> fmi = FacesContext.getCurrentInstance().getMessages(); | |
return fmi.hasNext(); | |
} | |
protected void checkPageAccess() | |
{ | |
/* Throw exception if User has no Access */ | |
} | |
private void restoreSessionMessage() | |
{ | |
// Restore Session Error Message | |
ExternalContext ec = FacesContext.getCurrentInstance().getExternalContext(); | |
Map<String, Object> map = ec.getSessionMap(); | |
if (map.containsKey(SESSION_MESSAGE)) | |
{ | |
FacesMessage errorMsg = (FacesMessage) map.get(SESSION_MESSAGE); | |
FacesContext.getCurrentInstance().addMessage(getPageName(), errorMsg); | |
map.remove(SESSION_MESSAGE); | |
} | |
} | |
private void logAndHandleActionException(String action, Throwable e) | |
{ | |
String msg = "Failed to perform action " + action + " on " + getPageName(); | |
// Message | |
Page.log.error(msg, e); | |
if (!handleActionError(action, e)) | |
{ // Not handled. Throw again | |
if (e instanceof EmpireException) | |
throw ((EmpireException)e); | |
else | |
throw new InternalException(e); | |
} | |
} | |
protected void setSessionMessage(FacesMessage facesMsg) | |
{ | |
// Set Session Message | |
ExternalContext ec = FacesContext.getCurrentInstance().getExternalContext(); | |
ec.getSessionMap().put(SESSION_MESSAGE, facesMsg); | |
} | |
protected boolean handleActionError(String action, Throwable e) | |
{ | |
// Set Faces Message | |
String msg = getErrorMessage(e); | |
String detail = extractErrorMessageDetail(action, e, 1); | |
log.error(msg + "\r\n" + detail); | |
FacesMessage facesMsg = new FacesMessage(FacesMessage.SEVERITY_ERROR, msg, detail); | |
setSessionMessage(facesMsg); | |
// Return to parent page | |
PageDefinition parentPage = getParentPage(); | |
if (parentPage == null) | |
{ FacesContext.getCurrentInstance().addMessage(getPageName(), facesMsg); | |
return false; | |
} | |
// redirect | |
navigateTo(parentPage.getRedirect()); | |
return true; | |
} | |
protected void setErrorMessage(Throwable e) | |
{ | |
String msg = getErrorMessage(e); | |
String detail = extractErrorMessageDetail(action, e, 1); | |
if (log.isDebugEnabled()) | |
log.debug(msg + "\r\n" + detail, e); | |
FacesMessage facesMsg = new FacesMessage(FacesMessage.SEVERITY_ERROR, msg, detail); | |
FacesContext.getCurrentInstance().addMessage(getPageName(), facesMsg); | |
} | |
protected String getErrorMessage(Throwable e) | |
{ // Wrap Exception | |
if (!(e instanceof EmpireException)) | |
e = new InternalException(e); | |
// get message | |
return getTextResolver().getExceptionMessage((Exception)e); | |
} | |
protected String extractErrorMessageDetail(String action, Throwable e, int stackTraceElements) | |
{ | |
StringBuilder b = new StringBuilder(); | |
b.append("Error performing action '"); | |
b.append(action); | |
b.append("' on page "); | |
b.append(getPageName()); | |
b.append(": "); | |
b.append(e.toString()); | |
b.append("\r\nat:"); | |
StackTraceElement[] stack = e.getStackTrace(); | |
int len = (stack.length>stackTraceElements) ? stackTraceElements : stack.length; | |
for (int i=0; i<len; i++) | |
{ | |
b.append(stack[i].toString()); | |
b.append("\r\n"); | |
} | |
return b.toString(); | |
} | |
/** | |
* navigates to the desired page. Depending on the page outcome provided this is either a forward or a redirect. | |
* @param outcome the destination page to navigate to | |
*/ | |
protected void navigateTo(PageOutcome outcome) | |
{ | |
if (log.isDebugEnabled()) | |
log.debug("Redirecting from page {} to page {}.", getPageName(), outcome.toString()); | |
// Return to Parent | |
FacesContext context = FacesContext.getCurrentInstance(); | |
// Retrieve the NavigationHandler instance.. | |
NavigationHandler navHandler = context.getApplication().getNavigationHandler(); | |
// Invoke nav handling.. | |
navHandler.handleNavigation(context, action, outcome.toString()); | |
// Trigger a switch to Render Response if needed | |
context.renderResponse(); | |
} | |
/** | |
* adds a page element to this page | |
* DO NOT CALL yourself, this method is called from the PageElement constructor! | |
* | |
* @param element | |
*/ | |
protected void registerPageElement(PageElement element) | |
{ | |
if (pageElements == null) | |
pageElements = new ArrayList<PageElement>(1); | |
// register now | |
if (pageElements.contains(element) == false) | |
pageElements.add(element); | |
else | |
log.warn("PageElement {} was registered twice!", element.getPropertyName()); | |
} | |
/** | |
* Helper methods for parent outcome | |
* | |
* @param action | |
* @param redirect | |
* @return the parent outcome string | |
*/ | |
protected PageOutcome getParentOutcome(String action, boolean redirect) | |
{ | |
PageDefinition parentPage = getParentPage(); | |
if (parentPage == null) | |
throw new MiscellaneousErrorException("No Parent Page defined for " + getPageName()); | |
if (redirect) | |
return parentPage.getRedirect(action); | |
else | |
return parentPage.getOutcome(action); | |
} | |
protected PageOutcome getParentOutcome(boolean redirect) | |
{ | |
return getParentOutcome(null, redirect); | |
} | |
/** | |
* return a connection for a particular database | |
* @param db the database for which to obtain a connection | |
* @return the connection for the given database | |
*/ | |
public Connection getConnection(DBDatabase db) | |
{ | |
WebApplication app = FacesUtils.getWebApplication(); | |
return app.getConnectionForRequest(FacesUtils.getContext(), db); | |
} | |
public Object[] getKeyFromParam(DBRowSet rowset, String idParam) | |
{ | |
FacesContext fc = FacesUtils.getContext(); | |
return FacesUtils.getParameterMap(fc).getKey(rowset, idParam); | |
} | |
public Object[] getKeyFromParam(PageDefinition page, DBRowSet rowset, String idParam) | |
{ | |
FacesContext fc = FacesUtils.getContext(); | |
return FacesUtils.getParameterMap(fc).getKey(page, rowset, idParam); | |
} | |
public String getIdParamForKey(DBRowSet rowset, Object[] key) | |
{ | |
FacesContext fc = FacesUtils.getContext(); | |
return FacesUtils.getParameterMap(fc).put(rowset, key); | |
} | |
public String getIdParamForKey(PageDefinition page, DBRowSet rowset, Object[] key) | |
{ | |
FacesContext fc = FacesUtils.getContext(); | |
return FacesUtils.getParameterMap(fc).put(page, rowset, key); | |
} | |
public void addJavascriptCall(String function) | |
{ | |
// Add Call | |
FacesContext fc = FacesUtils.getContext(); | |
WebApplication app = FacesUtils.getWebApplication(); | |
app.addJavascriptCall(fc, function); | |
} | |
/* Page Resources */ | |
/** | |
* Adds an object required for resource handling, to the page resource map. | |
* <pre> | |
* Since resource requests are not attached to a view, they cannot access page properties via expression language like this | |
* #{page.someProperty} | |
* Instead, the page should add properties that are required to the "pageResources"-map. This map is held on the session, and cleared when the page changes. | |
* In order to access such page resources via expression language use | |
* #{pageResources.someProperty} | |
* </pre> | |
* @param name the name of the resource | |
* @param resource the resource | |
*/ | |
public void addPageResource(String name, Object resource) | |
{ | |
Map<String, Object> prm = FacesUtils.getPageResourceMap(FacesUtils.getContext()); | |
prm.put(name, this); | |
} | |
/** | |
* Returns the page resource object previously added by addPageResource(...) | |
* @param name the name of the resource | |
* @return resource the resource | |
*/ | |
public Object getPageResource(String name) | |
{ | |
Map<String, Object> prm = FacesUtils.getPageResourceMap(FacesUtils.getContext()); | |
return prm.get(name); | |
} | |
/* Default Init Method */ | |
public void doInit() | |
{ | |
if (pageElements != null) | |
{ // Init Page Elements | |
for (PageElement pe : pageElements) | |
doInitElement(pe); | |
} | |
} | |
public void doRefresh() | |
{ | |
if (pageElements != null) | |
{ // Refresh Page Elements | |
for (PageElement pe : pageElements) | |
doRefreshElement(pe); | |
} | |
} | |
/** | |
* called by doInit() to initialize a particular page element | |
* @param pe the page element to initialize | |
*/ | |
protected void doInitElement(PageElement pe) | |
{ | |
pe.onInitPage(); | |
} | |
/** | |
* called by doRefresh() to refresh a particular page element | |
* @param pe the page element to refresh | |
*/ | |
protected void doRefreshElement(PageElement pe) | |
{ | |
pe.onRefreshPage(); | |
} | |
/* Helpers */ | |
protected final TextResolver getTextResolver() | |
{ | |
FacesContext fc = FacesUtils.getContext(); | |
return FacesUtils.getTextResolver(fc); | |
} | |
} |