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Java(TM) EE 7 Specification APIs
/*
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*
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* and Distribution License("CDDL") (collectively, the "License"). You
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*
* Copyright 2004 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
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*
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package javax.el;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Constructor;
import java.lang.reflect.Modifier;
import java.text.MessageFormat;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import java.util.MissingResourceException;
import java.util.ResourceBundle;
/**
*
* Utility methods for this portion of the EL implementation
*
* Methods on this class use a Map instance stored in ThreadLocal storage
* to minimize the performance impact on operations that take place multiple
* times on a single Thread. The keys and values of the Map
* are implementation private.
*
* @author edburns
* @author Kin-man Chung
*/
class ELUtil {
/**
* This class may not be constructed.
*/
private ELUtil() {
}
/* For testing Backward Compatibility option
static java.util.Properties properties = new java.util.Properties();
static {
properties.setProperty("javax.el.bc2.2", "true");
}
*/
public static ExpressionFactory exprFactory =
ExpressionFactory.newInstance(/*properties*/);
/**
* The ThreadLocal variable used to record the
* {@link javax.faces.context.FacesContext} instance for each
* processing thread.
*/
private static ThreadLocal> instance =
new ThreadLocal>() {
protected Map initialValue() {
return (null);
}
};
/**
* @return a Map stored in ThreadLocal storage. This may
* be used by methods of this class to minimize the performance
* impact for operations that may take place multiple times on a given
* Thread instance.
*/
private static Map getCurrentInstance() {
Map result = instance.get();
if (null == result) {
result = new HashMap();
setCurrentInstance(result);
}
return result;
}
/**
* Replace the Map with the argument context.
*
* @param context the Map to be stored in ThreadLocal storage.
*/
private static void setCurrentInstance(Map context) {
instance.set(context);
}
/*
* Convenience method, calls through to
* {@link #getExceptionMessageString(javax.el.ELContext,java.lang.String,Object []).
*
*
* @param context the ELContext from which the Locale for this message
* is extracted.
*
* @param messageId the messageId String in the ResourceBundle
*
* @return a localized String for the argument messageId
*/
public static String getExceptionMessageString(ELContext context, String messageId) {
return getExceptionMessageString(context, messageId, null);
}
/*
* Return a Localized message String suitable for use as an Exception message.
* Examine the argument context for a Locale. If
* not present, use Locale.getDefault(). Load the
* ResourceBundle "javax.el.Messages" using that locale. Get
* the message string for argument messageId. If not found
* return "Missing Resource in EL implementation ??? messageId ???"
* with messageId substituted with the runtime
* value of argument messageId. If found, and argument
* params is non-null, format the message using the
* params. If formatting fails, return a sensible message including
* the messageId. If argument params is
* null, skip formatting and return the message directly, otherwise
* return the formatted message.
*
* @param context the ELContext from which the Locale for this message
* is extracted.
*
* @param messageId the messageId String in the ResourceBundle
*
* @param params parameters to the message
*
* @return a localized String for the argument messageId
*/
public static String getExceptionMessageString(ELContext context,
String messageId,
Object [] params) {
String result = "";
Locale locale = null;
if (null == context || null == messageId) {
return result;
}
if (null == (locale = context.getLocale())) {
locale = Locale.getDefault();
}
if (null != locale) {
Map threadMap = getCurrentInstance();
ResourceBundle rb = null;
if (null == (rb = (ResourceBundle)
threadMap.get(locale.toString()))) {
rb = ResourceBundle.getBundle("javax.el.PrivateMessages",
locale);
threadMap.put(locale.toString(), rb);
}
if (null != rb) {
try {
result = rb.getString(messageId);
if (null != params) {
result = MessageFormat.format(result, params);
}
} catch (IllegalArgumentException iae) {
result = "Can't get localized message: parameters to message appear to be incorrect. Message to format: " + messageId;
} catch (MissingResourceException mre) {
result = "Missing Resource in EL implementation: ???" + messageId + "???";
} catch (Exception e) {
result = "Exception resolving message in EL implementation: ???" + messageId + "???";
}
}
}
return result;
}
static ExpressionFactory getExpressionFactory() {
return exprFactory;
}
static Constructor findConstructor(Class klass,
Class[] paramTypes,
Object[] params) {
if (paramTypes != null) {
try {
Constructor c = klass.getConstructor(paramTypes);
if (Modifier.isPublic(c.getModifiers())) {
return c;
}
} catch (java.lang.NoSuchMethodException ex) {
}
throw new MethodNotFoundException("The constructor for class " +
klass + " not found or accessible");
}
int paramCount = (params == null)? 0: params.length;
for (Constructor c: klass.getConstructors()) {
if (c.isVarArgs() || c.getParameterTypes().length==paramCount) {
return c;
}
}
throw new MethodNotFoundException("The constructor for class " +
klass + " not found");
}
static Object invokeConstructor(ELContext context,
Constructor c,
Object[] params) {
Class[] parameterTypes = c.getParameterTypes();
Object[] parameters = null;
if (parameterTypes.length > 0) {
if (c.isVarArgs()) {
// TODO
} else {
parameters = new Object[parameterTypes.length];
for (int i = 0; i < parameterTypes.length; i++) {
parameters[i] = context.convertToType(params[i],
parameterTypes[i]);
}
}
}
try {
return c.newInstance(parameters);
} catch (IllegalAccessException iae) {
throw new ELException(iae);
} catch (InvocationTargetException ite) {
throw new ELException(ite.getCause());
} catch (InstantiationException ie) {
throw new ELException(ie.getCause());
}
}
static Method findMethod(Class klass,
String method,
Class[] paramTypes,
Object[] params,
boolean staticOnly) {
if (paramTypes != null) {
try {
Method m = klass.getMethod(method, paramTypes);
int mod = m.getModifiers();
if (Modifier.isPublic(mod) &&
(!staticOnly || Modifier.isStatic(mod))) {
return m;
}
} catch (java.lang.NoSuchMethodException ex) {
}
throw new MethodNotFoundException("Method " + method +
"for class " + klass +
" not found or accessible");
}
int paramCount = (params == null)? 0: params.length;
for (Method m: klass.getMethods()) {
if (m.getName().equals(method) && (
m.isVarArgs() ||
m.getParameterTypes().length==paramCount)){
return m;
}
}
throw new MethodNotFoundException("Method " + method + " not found");
}
static Object invokeMethod(ELContext context,
Method m, Object base, Object[] params) {
Class[] parameterTypes = m.getParameterTypes();
Object[] parameters = null;
if (parameterTypes.length > 0) {
if (m.isVarArgs()) {
// TODO
} else {
parameters = new Object[parameterTypes.length];
for (int i = 0; i < parameterTypes.length; i++) {
parameters[i] = context.convertToType(params[i],
parameterTypes[i]);
}
}
}
try {
return m.invoke(base, parameters);
} catch (IllegalAccessException iae) {
throw new ELException(iae);
} catch (InvocationTargetException ite) {
throw new ELException(ite.getCause());
}
}
}