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JSR-000344: JavaServer(TM) Faces 2.2 API
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package javax.faces.webapp;
import javax.el.ValueExpression;
import javax.faces.FactoryFinder;
import javax.faces.application.Application;
import javax.faces.application.ApplicationFactory;
import javax.faces.application.FacesMessage;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.el.ValueBinding;
import java.text.MessageFormat;
import java.util.Locale;
import java.util.MissingResourceException;
import java.util.ResourceBundle;
/**
*
* supported filters: package and
* protection.
*/
class MessageFactory {
private static final String MOJARRA_RESOURCE_BASENAME =
"com.sun.faces.resources.Messages";
private MessageFactory() {
}
/**
* @see #getMessage(String, Object...)
* @param severity set a custom severity
*/
static FacesMessage getMessage(String messageId,
FacesMessage.Severity severity,
Object... params) {
FacesMessage message = getMessage(messageId, params);
message.setSeverity(severity);
return message;
}
/**
* @see #getMessage(Locale, String, Object...)
* @param severity set a custom severity
*/
static FacesMessage getMessage(Locale locale,
String messageId,
FacesMessage.Severity severity,
Object... params) {
FacesMessage message = getMessage(locale, messageId, params);
message.setSeverity(severity);
return message;
}
/**
* @see #getMessage(FacesContext, String, Object...)
* @param severity set a custom severity
*/
static FacesMessage getMessage(FacesContext context,
String messageId,
FacesMessage.Severity severity,
Object... params) {
FacesMessage message = getMessage(context, messageId, params);
message.setSeverity(severity);
return message;
}
/**
* This version of getMessage() is used for localizing implementation
* specific messages.
*
* @param messageId - the key of the message in the resource bundle
* @param params - substittion parameters
*
* @return a localized FacesMessage with the severity
* of FacesMessage.SEVERITY_ERROR
*/
static FacesMessage getMessage(String messageId,
Object... params) {
Locale locale = null;
FacesContext context = FacesContext.getCurrentInstance();
// context.getViewRoot() may not have been initialized at this point.
if (context != null && context.getViewRoot() != null) {
locale = context.getViewRoot().getLocale();
if (locale == null) {
locale = Locale.getDefault();
}
} else {
locale = Locale.getDefault();
}
return getMessage(locale, messageId, params);
}
/**
* Creates and returns a FacesMessage for the specified Locale.
*
* @param locale - the target Locale
* @param messageId - the key of the message in the resource bundle
* @param params - substittion parameters
*
* @return a localized FacesMessage with the severity
* of FacesMessage.SEVERITY_ERROR
*/
static FacesMessage getMessage(Locale locale,
String messageId,
Object... params) {
String summary = null;
String detail = null;
ResourceBundle bundle;
String bundleName;
// see if we have a user-provided bundle
Application app = getApplication();
Class appClass = app.getClass();
if (null != (bundleName = app.getMessageBundle())) {
if (null !=
(bundle =
ResourceBundle.getBundle(bundleName, locale,
getCurrentLoader(appClass)))) {
// see if we have a hit
try {
summary = bundle.getString(messageId);
detail = bundle.getString(messageId + "_detail");
}
catch (MissingResourceException e) {
// ignore
}
}
}
// we couldn't find a summary in the user-provided bundle
if (null == summary) {
// see if we have a summary in the app provided bundle
bundle = ResourceBundle.getBundle(FacesMessage.FACES_MESSAGES,
locale,
getCurrentLoader(appClass));
if (null == bundle) {
throw new NullPointerException();
}
// see if we have a hit
try {
summary = bundle.getString(messageId);
detail = bundle.getString(messageId + "_detail");
} catch (MissingResourceException e) {
// ignore
}
}
// no hit found in the standard javax.faces.Messages bundle.
// check the Mojarra resources
if (summary == null) {
// see if we have a summary in the app provided bundle
bundle = ResourceBundle.getBundle(MOJARRA_RESOURCE_BASENAME,
locale,
getCurrentLoader(appClass));
if (null == bundle) {
throw new NullPointerException();
}
// see if we have a hit
try {
summary = bundle.getString(messageId);
} catch (MissingResourceException e) {
return null;
}
}
// At this point, we have a summary and a bundle.
FacesMessage ret = new BindingFacesMessage(locale, summary, detail, params);
ret.setSeverity(FacesMessage.SEVERITY_ERROR);
return (ret);
}
/**
* Creates and returns a FacesMessage for the specified Locale.
*
* @param context - the FacesContext for the current request
* @param messageId - the key of the message in the resource bundle
* @param params - substittion parameters
*
* @return a localized FacesMessage with the severity
* of FacesMessage.SEVERITY_ERROR
*/
static FacesMessage getMessage(FacesContext context,
String messageId,
Object... params) {
if (context == null || messageId == null ) {
throw new NullPointerException(" context "
+ context
+ " messageId "
+ messageId);
}
Locale locale;
// viewRoot may not have been initialized at this point.
if (context.getViewRoot() != null) {
locale = context.getViewRoot().getLocale();
} else {
locale = Locale.getDefault();
}
if (null == locale) {
throw new NullPointerException(" locale is null ");
}
FacesMessage message = getMessage(locale, messageId, params);
if (message != null) {
return message;
}
locale = Locale.getDefault();
return (getMessage(locale, messageId, params));
}
/**
* Returns the label property from the specified
* component.
*
* @param context - the FacesContext for the current request
* @param component - the component of interest
*
* @return the label, if any, of the component
*/
static Object getLabel(FacesContext context,
UIComponent component) {
Object o = component.getAttributes().get("label");
if (o == null || (o instanceof String && ((String) o).length() == 0)) {
o = component.getValueExpression("label");
}
// Use the "clientId" if there was no label specified.
if (o == null) {
o = component.getClientId(context);
}
return o;
}
protected static Application getApplication() {
FacesContext context = FacesContext.getCurrentInstance();
if (context != null) {
return (FacesContext.getCurrentInstance().getApplication());
}
ApplicationFactory afactory = (ApplicationFactory)
FactoryFinder.getFactory(FactoryFinder.APPLICATION_FACTORY);
return (afactory.getApplication());
}
protected static ClassLoader getCurrentLoader(Class fallbackClass) {
ClassLoader loader =
Thread.currentThread().getContextClassLoader();
if (loader == null) {
loader = fallbackClass.getClassLoader();
}
return loader;
}
/**
* This class overrides FacesMessage to provide the evaluation
* of binding expressions in addition to Strings.
* It is often the case, that a binding expression may reference
* a localized property value that would be used as a
* substitution parameter in the message. For example:
* #{bundle.userLabel}
* "bundle" may not be available until the page is rendered.
* The "late" binding evaluation in getSummary and
* getDetail allow the expression to be evaluated
* when that property is available.
*/
static class BindingFacesMessage extends FacesMessage {
BindingFacesMessage(
Locale locale,
String messageFormat,
String detailMessageFormat,
// array of parameters, both Strings and ValueBindings
Object[] parameters) {
super(messageFormat, detailMessageFormat);
this.locale = locale;
this.parameters = parameters;
if (parameters != null) {
resolvedParameters = new Object[parameters.length];
}
}
public String getSummary() {
String pattern = super.getSummary();
resolveBindings();
return getFormattedString(pattern, resolvedParameters);
}
public String getDetail() {
String pattern = super.getDetail();
resolveBindings();
return getFormattedString(pattern, resolvedParameters);
}
private void resolveBindings() {
FacesContext context = null;
if (parameters != null) {
for (int i = 0; i < parameters.length; i++) {
Object o = parameters[i];
if (o instanceof ValueBinding) {
if (context == null) {
context = FacesContext.getCurrentInstance();
}
o = ((ValueBinding) o).getValue(context);
}
if (o instanceof ValueExpression) {
if (context == null) {
context = FacesContext.getCurrentInstance();
}
o = ((ValueExpression) o).getValue(context.getELContext());
}
// to avoid 'null' appearing in message
if (o == null) {
o = "";
}
resolvedParameters[i] = o;
}
}
}
private String getFormattedString(String msgtext, Object[] params) {
String localizedStr = null;
if (params == null || msgtext == null ) {
return msgtext;
}
StringBuffer b = new StringBuffer(100);
MessageFormat mf = new MessageFormat(msgtext);
if (locale != null) {
mf.setLocale(locale);
b.append(mf.format(params));
localizedStr = b.toString();
}
return localizedStr;
}
private Locale locale;
private Object[] parameters;
private Object[] resolvedParameters;
}
} // end of class MessageFactory