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org.apache.commons.jexl3.internal.introspection
Class Uberspect

java.lang.Object
  extended by org.apache.commons.jexl3.internal.introspection.Uberspect
All Implemented Interfaces:
JexlUberspect
public class Uberspect
extends Object
implements JexlUberspect

Implementation of Uberspect to provide the default introspective functionality of JEXL.

This is the class to derive to customize introspection.

Since:
1.0

Nested Class Summary
protected  class Uberspect.ArithmeticUberspect
          The concrete uberspect Arithmetic class.
 
Nested classes/interfaces inherited from interface org.apache.commons.jexl3.introspection.JexlUberspect
JexlUberspect.JexlResolver, JexlUberspect.PropertyResolver, JexlUberspect.ResolverStrategy
 
Field Summary
protected  org.apache.commons.logging.Log rlog
          The logger to use for all warnings and errors.
static Object TRY_FAILED
          Publicly exposed special failure object returned by tryInvoke.
 
Fields inherited from interface org.apache.commons.jexl3.introspection.JexlUberspect
JEXL_STRATEGY, MAP, MAP_STRATEGY, POJO
 
Constructor Summary
Uberspect(org.apache.commons.logging.Log runtimeLogger, JexlUberspect.ResolverStrategy sty)
          Creates a new Uberspect.
 
Method Summary
protected  Introspector base()
          Gets the current introspector base.
 JexlArithmetic.Uberspect getArithmetic(JexlArithmetic arithmetic)
          Gets an arithmetic operator resolver for a given arithmetic instance.
 Class<?> getClassByName(String className)
          Gets a class by name through this introspector class loader.
 JexlMethod getConstructor(Object ctorHandle, Object... args)
          Returns a class constructor.
 Field getField(Class<?> c, String key)
          Gets the field named by key for the class c.
 String[] getFieldNames(Class<?> c)
          Gets the accessible field names known for a given class.
 Iterator<?> getIterator(Object obj)
          Gets an iterator from an object.
 Method getMethod(Class<?> c, MethodKey key)
          Gets the method defined by key and for the Class c.
 Method getMethod(Class<?> c, String name, Object[] params)
          Gets the method defined by name and params for the Class c.
 JexlMethod getMethod(Object obj, String method, Object... args)
          Returns a JexlMethod.
 String[] getMethodNames(Class<?> c)
          Gets the accessible methods names known for a given class.
 Method[] getMethods(Class<?> c, String methodName)
          Gets all the methods with a given name from this map.
 JexlPropertyGet getPropertyGet(List<JexlUberspect.PropertyResolver> resolvers, Object obj, Object identifier)
          Property getter.
 JexlPropertyGet getPropertyGet(Object obj, Object identifier)
          Property getter.
 JexlPropertySet getPropertySet(List<JexlUberspect.PropertyResolver> resolvers, Object obj, Object identifier, Object arg)
          Property setter.
 JexlPropertySet getPropertySet(Object obj, Object identifier, Object arg)
          Property setter.
 List<JexlUberspect.PropertyResolver> getResolvers(JexlOperator op, Object obj)
          Applies this uberspect property resolver strategy.
 int getVersion()
          Gets this uberspect version.
 void setClassLoader(ClassLoader nloader)
          Sets the class loader to use.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

TRY_FAILED

public static final Object TRY_FAILED
Publicly exposed special failure object returned by tryInvoke.

rlog

protected final org.apache.commons.logging.Log rlog
The logger to use for all warnings and errors.

Constructor Detail

Uberspect

public Uberspect(org.apache.commons.logging.Log runtimeLogger,
                 JexlUberspect.ResolverStrategy sty)
Creates a new Uberspect.

Parameters:
runtimeLogger - the logger used for all logging needs
sty - the resolver strategy
Method Detail

base

protected final Introspector base()
Gets the current introspector base.

If the reference has been collected, this method will recreate the underlying introspector.

Returns:
the introspector

setClassLoader

public void setClassLoader(ClassLoader nloader)
Description copied from interface: JexlUberspect
Sets the class loader to use.

This increments the version.

Specified by:
setClassLoader in interface JexlUberspect
Parameters:
nloader - the class loader

getVersion

public int getVersion()
Description copied from interface: JexlUberspect
Gets this uberspect version.

Specified by:
getVersion in interface JexlUberspect
Returns:
the class loader modification count

getClassByName

public final Class<?> getClassByName(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

getField

public final Field getField(Class<?> c,
                            String key)
Gets the field named by key for the class c.

Parameters:
c - Class in which the field search is taking place
key - Name of the field being searched for
Returns:
a Field or null if it does not exist or is not accessible

getFieldNames

public final String[] getFieldNames(Class<?> c)
Gets the accessible field names known for a given class.

Parameters:
c - the class
Returns:
the class field names

getMethod

public final Method getMethod(Class<?> c,
                              String name,
                              Object[] params)
Gets the method defined by name and params for the Class c.

Parameters:
c - Class in which the method search is taking place
name - Name of the method being searched for
params - An array of Objects (not Classes) that describe the the parameters
Returns:
a Method or null if no unambiguous method could be found through introspection.

getMethod

public final Method getMethod(Class<?> c,
                              MethodKey key)
Gets the method defined by key and for the Class c.

Parameters:
c - Class in which the method search is taking place
key - MethodKey of the method being searched for
Returns:
a Method or null if no unambiguous method could be found through introspection.

getMethodNames

public final String[] getMethodNames(Class<?> c)
Gets the accessible methods names known for a given class.

Parameters:
c - the class
Returns:
the class method names

getMethods

public final Method[] getMethods(Class<?> c,
                                 String methodName)
Gets all the methods with a given name from this map.

Parameters:
c - the class
methodName - the seeked methods name
Returns:
the array of methods

getMethod

public JexlMethod getMethod(Object obj,
                            String method,
                            Object... args)
Description copied from interface: JexlUberspect
Returns a JexlMethod.

Specified by:
getMethod in interface JexlUberspect
Parameters:
obj - the object
method - the method name
args - method arguments
Returns:
a JexlMethod

getResolvers

public List<JexlUberspect.PropertyResolver> getResolvers(JexlOperator op,
                                                         Object obj)
Description copied from interface: JexlUberspect
Applies this uberspect property resolver strategy.

Specified by:
getResolvers in interface JexlUberspect
Parameters:
op - the operator
obj - the object
Returns:
the applied strategy resolver list

getPropertyGet

public JexlPropertyGet getPropertyGet(Object obj,
                                      Object identifier)
Description copied from interface: JexlUberspect
Property getter.

returns a JelPropertySet apropos to an expression like bar.woogie.

Specified by:
getPropertyGet in interface JexlUberspect
Parameters:
obj - the object to get the property from
identifier - property name
Returns:
a JexlPropertyGet or null

getPropertyGet

public JexlPropertyGet getPropertyGet(List<JexlUberspect.PropertyResolver> resolvers,
                                      Object obj,
                                      Object identifier)
Description copied from interface: JexlUberspect
Property getter.

Seeks a JexlPropertyGet apropos to an expression like bar.woogie.

See JexlUberspect.ResolverStrategy.apply(JexlOperator, java.lang.Object)

Specified by:
getPropertyGet in interface JexlUberspect
Parameters:
resolvers - the list of property resolvers to try
obj - the object to get the property from
identifier - property name
Returns:
a JexlPropertyGet or null

getPropertySet

public JexlPropertySet getPropertySet(Object obj,
                                      Object identifier,
                                      Object arg)
Description copied from interface: JexlUberspect
Property setter.

Seeks a JelPropertySet apropos to an expression like foo.bar = "geir".

Specified by:
getPropertySet in interface JexlUberspect
Parameters:
obj - the object to get the property from.
identifier - property name
arg - value to set
Returns:
a JexlPropertySet or null

getPropertySet

public JexlPropertySet getPropertySet(List<JexlUberspect.PropertyResolver> resolvers,
                                      Object obj,
                                      Object identifier,
                                      Object arg)
Description copied from interface: JexlUberspect
Property setter.

Seeks a JelPropertySet apropos to an expression like foo.bar = "geir".

See JexlUberspect.ResolverStrategy.apply(JexlOperator, java.lang.Object)

Specified by:
getPropertySet in interface JexlUberspect
Parameters:
resolvers - the list of property resolvers to try,
obj - the object to get the property from
identifier - property name
arg - value to set
Returns:
a JexlPropertySet or null

getIterator

public Iterator<?> getIterator(Object obj)
Description copied from interface: JexlUberspect
Gets an iterator from an object.

Specified by:
getIterator in interface JexlUberspect
Parameters:
obj - to get the iterator from
Returns:
an iterator over obj or null

getConstructor

public JexlMethod getConstructor(Object ctorHandle,
                                 Object... args)
Description copied from interface: JexlUberspect
Returns a class constructor.

Specified by:
getConstructor in interface JexlUberspect
Parameters:
ctorHandle - a class or class name
args - constructor arguments
Returns:
a JexlMethod

getArithmetic

public JexlArithmetic.Uberspect getArithmetic(JexlArithmetic arithmetic)
Description copied from interface: JexlUberspect
Gets an arithmetic operator resolver for a given arithmetic instance.

Specified by:
getArithmetic in interface JexlUberspect
Parameters:
arithmetic - the arithmetic instance
Returns:
the arithmetic uberspect or null if no operator method were overridden
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