com.djrapitops.plan.utilities.java

Class Reflection

java.lang.Object

com.djrapitops.plan.utilities.java.Reflection

public final class Reflection
extends java.lang.Object

An utility class that simplifies reflection in Bukkit plugins.

Modified Reflection utility from LagMonitor plugin. https://github.com/games647/LagMonitor/blob/master/src/main/java/com/github/games647/lagmonitor/traffic/Reflection.java

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	Reflection.ConstructorInvoker An interface for invoking a specific constructor.
static interface	Reflection.FieldAccessor<T> An interface for retrieving the field content.
static interface	Reflection.MethodInvoker An interface for invoking a specific method.

Method Summary

Modifier and Type	Method and Description
static java.lang.Class<?>	getClass(java.lang.String lookupName) Retrieve a class from its full name.
static Reflection.ConstructorInvoker	getConstructor(java.lang.Class<?> clazz, java.lang.Class<?>... params) Search for the first publicly and privately defined constructor of the given name and parameter count.
static Reflection.ConstructorInvoker	getConstructor(java.lang.String className, java.lang.Class<?>... params) Search for the first publicly and privately defined constructor of the given name and parameter count.
static java.lang.Class<?>	getCraftBukkitClass(java.lang.String name) Retrieve a class in the org.bukkit.craftbukkit.VERSION.* package.
static <T> Reflection.FieldAccessor<T>	getField(java.lang.Class<?> target, java.lang.Class<T> fieldType, int index) Retrieve a field accessor for a specific field type and name.
static <T> Reflection.FieldAccessor<T>	getField(java.lang.Class<?> target, java.lang.String name, java.lang.Class<T> fieldType) Retrieve a field accessor for a specific field type and name.
static <T> Reflection.FieldAccessor<T>	getField(java.lang.String className, java.lang.Class<T> fieldType, int index) Retrieve a field accessor for a specific field type and name.
static <T> Reflection.FieldAccessor<T>	getField(java.lang.String className, java.lang.String name, java.lang.Class<T> fieldType) Retrieve a field accessor for a specific field type and name.
static Reflection.MethodInvoker	getMethod(java.lang.Class<?> clazz, java.lang.String methodName, java.lang.Class<?>... params) Search for the first publicly and privately defined method of the given name and parameter count.
static Reflection.MethodInvoker	getMethod(java.lang.String className, java.lang.String methodName, java.lang.Class<?>... params) Search for the first publicly and privately defined method of the given name and parameter count.
static java.lang.Class<?>	getMinecraftClass(java.lang.String name) Retrieve a class in the net.minecraft.server.VERSION.* package.
static Reflection.MethodInvoker	getTypedMethod(java.lang.Class<?> clazz, java.lang.String methodName, java.lang.Class<?> returnType, java.lang.Class<?>... params) Search for the first publicly and privately defined method of the given name and parameter count.
static java.lang.Class<java.lang.Object>	getUntypedClass(java.lang.String lookupName) Retrieve a class from its full name, without knowing its type on compile time.

Methods inherited from class java.lang.Object

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

Method Detail

getField

public static <T> Reflection.FieldAccessor<T> getField(java.lang.Class<?> target,
                                                       java.lang.String name,
                                                       java.lang.Class<T> fieldType)

Retrieve a field accessor for a specific field type and name.

Parameters:

target - - the target type.

name - - the name of the field, or NULL to ignore.

fieldType - - a compatible field type.

Returns:

The field accessor.

getField

public static <T> Reflection.FieldAccessor<T> getField(java.lang.String className,
                                                       java.lang.String name,
                                                       java.lang.Class<T> fieldType)

Retrieve a field accessor for a specific field type and name.

Parameters:

className - - lookup name of the class, see getClass(String).

name - - the name of the field, or NULL to ignore.

fieldType - - a compatible field type.

Returns:

The field accessor.

getField

public static <T> Reflection.FieldAccessor<T> getField(java.lang.Class<?> target,
                                                       java.lang.Class<T> fieldType,
                                                       int index)

Retrieve a field accessor for a specific field type and name.

Parameters:

target - - the target type.

fieldType - - a compatible field type.

index - - the number of compatible fields to skip.

Returns:

The field accessor.

getField

public static <T> Reflection.FieldAccessor<T> getField(java.lang.String className,
                                                       java.lang.Class<T> fieldType,
                                                       int index)

Retrieve a field accessor for a specific field type and name.

Parameters:

className - - lookup name of the class, see getClass(String).

fieldType - - a compatible field type.

index - - the number of compatible fields to skip.

Returns:

The field accessor.

getMethod

public static Reflection.MethodInvoker getMethod(java.lang.String className,
                                                 java.lang.String methodName,
                                                 java.lang.Class<?>... params)

Search for the first publicly and privately defined method of the given name and parameter count.

Parameters:

className - - lookup name of the class, see getClass(String).

methodName - - the method name, or NULL to skip.

params - - the expected parameters.

Returns:

An object that invokes this specific method.

Throws:

java.lang.IllegalStateException - If we cannot find this method.

getMethod

public static Reflection.MethodInvoker getMethod(java.lang.Class<?> clazz,
                                                 java.lang.String methodName,
                                                 java.lang.Class<?>... params)

Search for the first publicly and privately defined method of the given name and parameter count.

Parameters:

clazz - - a class to start with.

methodName - - the method name, or NULL to skip.

params - - the expected parameters.

Returns:

An object that invokes this specific method.

Throws:

java.lang.IllegalStateException - If we cannot find this method.

getTypedMethod

public static Reflection.MethodInvoker getTypedMethod(java.lang.Class<?> clazz,
                                                      java.lang.String methodName,
                                                      java.lang.Class<?> returnType,
                                                      java.lang.Class<?>... params)

Search for the first publicly and privately defined method of the given name and parameter count.

Parameters:

clazz - - a class to start with.

methodName - - the method name, or NULL to skip.

returnType - - the expected return type, or NULL to ignore.

params - - the expected parameters.

Returns:

An object that invokes this specific method.

Throws:

java.lang.IllegalStateException - If we cannot find this method.

getConstructor

public static Reflection.ConstructorInvoker getConstructor(java.lang.String className,
                                                           java.lang.Class<?>... params)

Search for the first publicly and privately defined constructor of the given name and parameter count.

Parameters:

className - - lookup name of the class, see getClass(String).

params - - the expected parameters.

Returns:

An object that invokes this constructor.

Throws:

java.lang.IllegalStateException - If we cannot find this method.

getConstructor

public static Reflection.ConstructorInvoker getConstructor(java.lang.Class<?> clazz,
                                                           java.lang.Class<?>... params)

Search for the first publicly and privately defined constructor of the given name and parameter count.

Parameters:

clazz - - a class to start with.

params - - the expected parameters.

Returns:

An object that invokes this constructor.

Throws:

java.lang.IllegalStateException - If we cannot find this method.

getUntypedClass

public static java.lang.Class<java.lang.Object> getUntypedClass(java.lang.String lookupName)

Retrieve a class from its full name, without knowing its type on compile time.

This is useful when looking up fields by a NMS or OBC type.

Parameters:

lookupName - - the class name with variables.

Returns:

The class.

See Also:

Object.getClass()

getClass

public static java.lang.Class<?> getClass(java.lang.String lookupName)

Retrieve a class from its full name.

Strings enclosed with curly brackets - such as {TEXT} - will be replaced according to the following table:

Variable	Content
{nms}	Actual package name of net.minecraft.server.VERSION
{obc}	Actual package name of org.bukkit.craftbukkit.VERSION
{version}	The current Minecraft package VERSION, if any.

Parameters:

lookupName - - the class name with variables.

Returns:

The looked up class.

Throws:

java.lang.IllegalArgumentException - If a variable or class could not be found.

getMinecraftClass

public static java.lang.Class<?> getMinecraftClass(java.lang.String name)

Retrieve a class in the net.minecraft.server.VERSION.* package.

Parameters:

name - - the name of the class, excluding the package.

Throws:

java.lang.IllegalArgumentException - If the class doesn't exist.

getCraftBukkitClass

public static java.lang.Class<?> getCraftBukkitClass(java.lang.String name)

Retrieve a class in the org.bukkit.craftbukkit.VERSION.* package.

Parameters:

name - - the name of the class, excluding the package.

Throws:

java.lang.IllegalArgumentException - If the class doesn't exist.