org.apache.jasper.runtime
类 ProtectedFunctionMapper

java.lang.Object
  javax.el.FunctionMapper
      org.apache.jasper.runtime.ProtectedFunctionMapper

public final class ProtectedFunctionMapper
extends FunctionMapper

Maps EL functions to their Java method counterparts. Keeps the actual Method objects protected so that JSP pages can't indirectly do reflection.

作者：

Mark Roth, Kin-man Chung

方法摘要

static ProtectedFunctionMapper	getInstance() Generated Servlet and Tag Handler implementations call this method to retrieve an instance of the ProtectedFunctionMapper.
static ProtectedFunctionMapper	getMapForFunction(String fnQName, Class<?> c, String methodName, Class<?>[] args) Creates an instance for this class, and stores the Method for the given EL function prefix and name.
void	mapFunction(String fnQName, Class<?> c, String methodName, Class<?>[] args) Stores a mapping from the given EL function prefix and name to the given Java method.
Method	resolveFunction(String prefix, String localName) Resolves the specified local name and prefix into a Java.lang.Method.

从类 java.lang.Object 继承的方法

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

方法详细信息

getInstance

public static ProtectedFunctionMapper getInstance()

Generated Servlet and Tag Handler implementations call this method to retrieve an instance of the ProtectedFunctionMapper. This is necessary since generated code does not have access to create instances of classes in this package.

返回：

A new protected function mapper.

mapFunction

public void mapFunction(String fnQName,
                        Class<?> c,
                        String methodName,
                        Class<?>[] args)

Stores a mapping from the given EL function prefix and name to the given Java method.

参数：

fnQName - The EL function qualified name (including prefix)

c - The class containing the Java method

methodName - The name of the Java method

args - The arguments of the Java method

抛出：

RuntimeException - if no method with the given signature could be found.

getMapForFunction

public static ProtectedFunctionMapper getMapForFunction(String fnQName,
                                                        Class<?> c,
                                                        String methodName,
                                                        Class<?>[] args)

Creates an instance for this class, and stores the Method for the given EL function prefix and name. This method is used for the case when there is only one function in the EL expression.

参数：

fnQName - The EL function qualified name (including prefix)

c - The class containing the Java method

methodName - The name of the Java method

args - The arguments of the Java method

抛出：

RuntimeException - if no method with the given signature could be found.

resolveFunction

public Method resolveFunction(String prefix,
                              String localName)

Resolves the specified local name and prefix into a Java.lang.Method. Returns null if the prefix and local name are not found.

指定者：

类 FunctionMapper 中的 resolveFunction

参数：

prefix - the prefix of the function

localName - the short name of the function

返回：

the result of the method mapping. Null means no entry found.