Class IntrospectorBase
- java.lang.Object
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- org.apache.commons.jexl2.internal.introspection.IntrospectorBase
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public class IntrospectorBase extends java.lang.Object
This basic function of this class is to return a Method object for a particular class given the name of a method and the parameters to the method in the form of an Object[]The first time the Introspector sees a class it creates a class method map for the class in question. Basically the class method map is a Hastable where Method objects are keyed by a concatenation of the method name and the names of classes that make up the parameters. For example, a method with the following signature: public void method(String a, StringBuffer b) would be mapped by the key: "method" + "java.lang.String" + "java.lang.StringBuffer" This mapping is performed for all the methods in a class and stored.
- Since:
- 1.0
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Field Summary
Fields Modifier and Type Field Description protected org.apache.commons.logging.Log
rlog
the logger.
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Constructor Summary
Constructors Constructor Description IntrospectorBase(org.apache.commons.logging.Log log)
Create the introspector.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description java.lang.Class<?>
getClassByName(java.lang.String className)
Gets a class by name through this introspector class loader.java.lang.reflect.Constructor<?>
getConstructor(java.lang.Class<?> c, MethodKey key)
Gets the constructor defined by theMethodKey
.java.lang.reflect.Constructor<?>
getConstructor(MethodKey key)
Gets the constructor defined by theMethodKey
.java.lang.reflect.Field
getField(java.lang.Class<?> c, java.lang.String key)
Gets the field named bykey
for the classc
.java.lang.String[]
getFieldNames(java.lang.Class<?> c)
Gets the array of accessible field names known for a given class.java.lang.reflect.Method
getMethod(java.lang.Class<?> c, MethodKey key)
Gets the method defined by theMethodKey
for the classc
.java.lang.String[]
getMethodNames(java.lang.Class<?> c)
Gets the array of accessible methods names known for a given class.java.lang.reflect.Method[]
getMethods(java.lang.Class<?> c, java.lang.String methodName)
Gets the array of accessible method known for a given class.void
setLoader(java.lang.ClassLoader cloader)
Sets the class loader used to solve constructors.
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Field Detail
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rlog
protected final org.apache.commons.logging.Log rlog
the logger.
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Constructor Detail
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IntrospectorBase
public IntrospectorBase(org.apache.commons.logging.Log log)
Create the introspector.- Parameters:
log
- the logger to use
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Method Detail
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getClassByName
public java.lang.Class<?> getClassByName(java.lang.String className)
Gets a class by name through this introspector class loader.- Parameters:
className
- the class name- Returns:
- the class instance or null if it could not be found
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getMethod
public java.lang.reflect.Method getMethod(java.lang.Class<?> c, MethodKey key)
Gets the method defined by theMethodKey
for the classc
.- Parameters:
c
- Class in which the method search is taking placekey
- Key of the method being searched for- Returns:
- The desired method object
- Throws:
MethodKey.AmbiguousException
- if no unambiguous method could be found through introspection
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getField
public java.lang.reflect.Field getField(java.lang.Class<?> c, java.lang.String key)
Gets the field named bykey
for the classc
.- Parameters:
c
- Class in which the field search is taking placekey
- Name of the field being searched for- Returns:
- the desired field or null if it does not exist or is not accessible
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getFieldNames
public java.lang.String[] getFieldNames(java.lang.Class<?> c)
Gets the array of accessible field names known for a given class.- Parameters:
c
- the class- Returns:
- the class field names
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getMethodNames
public java.lang.String[] getMethodNames(java.lang.Class<?> c)
Gets the array of accessible methods names known for a given class.- Parameters:
c
- the class- Returns:
- the class method names
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getMethods
public java.lang.reflect.Method[] getMethods(java.lang.Class<?> c, java.lang.String methodName)
Gets the array of accessible method known for a given class.- Parameters:
c
- the classmethodName
- the method name- Returns:
- the array of methods (null or not empty)
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setLoader
public void setLoader(java.lang.ClassLoader cloader)
Sets the class loader used to solve constructors.Also cleans the constructors and methods caches.
- Parameters:
cloader
- the class loader; if null, use this instance class loader
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getConstructor
public java.lang.reflect.Constructor<?> getConstructor(MethodKey key)
Gets the constructor defined by theMethodKey
.- Parameters:
key
- Key of the constructor being searched for- Returns:
- The desired constructor object or null if no unambiguous constructor could be found through introspection.
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getConstructor
public java.lang.reflect.Constructor<?> getConstructor(java.lang.Class<?> c, MethodKey key)
Gets the constructor defined by theMethodKey
.- Parameters:
c
- the class we want to instantiatekey
- Key of the constructor being searched for- Returns:
- The desired constructor object or null if no unambiguous constructor could be found through introspection.
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