Class IntrospectorBase
- java.lang.Object
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- org.apache.velocity.util.introspection.IntrospectorBase
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- Direct Known Subclasses:
Introspector
public abstract class IntrospectorBase extends Object
Lookup a a Method object for a particular class given the name of a method and its parameters. 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 Hashtable 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 for.- Version:
- $Id$
- Author:
- Jason van Zyl, Bob McWhirter, Attila Szegedi, Paulo Gaspar, Henning P. Schmiedehausen, Candid Dauth
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Field Summary
Fields Modifier and Type Field Description protected org.slf4j.Logger
log
Class logger
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Constructor Summary
Constructors Modifier Constructor Description protected
IntrospectorBase(org.slf4j.Logger log, TypeConversionHandler conversionHandler)
C'tor.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description Field
getField(Class<?> c, String name)
Gets the field defined byname
.protected IntrospectorCache
getIntrospectorCache()
Return the internal IntrospectorCache object.Method
getMethod(Class<?> c, String name, Object[] params)
Gets the method defined byname
andparams
for the Classc
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Constructor Detail
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IntrospectorBase
protected IntrospectorBase(org.slf4j.Logger log, TypeConversionHandler conversionHandler)
C'tor.- Parameters:
log
- loggerconversionHandler
- conversion handler
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Method Detail
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getMethod
public Method getMethod(Class<?> c, String name, Object[] params) throws MethodMap.AmbiguousException
Gets the method defined byname
andparams
for the Classc
.- Parameters:
c
- Class in which the method search is taking placename
- Name of the method being searched forparams
- An array of Objects (not Classes) that describe the the parameters- Returns:
- The desired Method object.
- Throws:
NullPointerException
- When the parameters passed in can not be used for introspection because null.MethodMap.AmbiguousException
- When the method map contains more than one match for the requested signature.
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getField
public Field getField(Class<?> c, String name) throws IllegalArgumentException
Gets the field defined byname
.- Parameters:
c
- Class in which the method search is taking placename
- Name of the field being searched for- Returns:
- The desired Field object.
- Throws:
IllegalArgumentException
- When the parameters passed in can not be used for introspection.
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getIntrospectorCache
protected IntrospectorCache getIntrospectorCache()
Return the internal IntrospectorCache object.- Returns:
- The internal IntrospectorCache object.
- Since:
- 1.5
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