graphana.model

Class PluginLoader

java.lang.Object

graphana.model.PluginLoader

public class PluginLoader
extends java.lang.Object

Loads an external class at runtime with the purpose to be used as operation, operation group or graph library.

Author:

Andreas Fender

Constructor Summary

Constructors

Constructor and Description
PluginLoader()

Method Summary

Methods

Modifier and Type	Method and Description
static byte[]	fileToByteArray(java.io.File file) Converts the whole content of a file into a byte array.
static <ClassType> ClassType	loadExternalClass(java.io.File file) Loads the external class at runtime.
static <ClassType> ClassType	loadExternalClass(java.lang.String filename) Loads the external class at runtime.

Methods inherited from class java.lang.Object

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

Constructor Detail

PluginLoader

public PluginLoader()

Method Detail

loadExternalClass

public static <ClassType> ClassType loadExternalClass(java.io.File file)
                                   throws java.io.IOException,
                                          java.lang.InstantiationException,
                                          java.lang.IllegalAccessException

Loads the external class at runtime.

Parameters:

file - The file of the class

Returns:

The loaded class

Throws:

java.io.IOException - If an error occurs when reading the file

java.lang.InstantiationException - If the external class could not be instantiated

java.lang.IllegalAccessException - If the external class could not be accessed after loading

loadExternalClass

public static <ClassType> ClassType loadExternalClass(java.lang.String filename)
                                   throws java.io.IOException,
                                          java.lang.InstantiationException,
                                          java.lang.IllegalAccessException

Loads the external class at runtime.

Parameters:

filename - The relative or absolute path to the class

Returns:

The loaded class

Throws:

java.io.IOException - If an error occurs when reading the file

java.lang.InstantiationException - If the external class could not be instantiated

java.lang.IllegalAccessException - If the external class could not be accessed after loading

fileToByteArray

public static byte[] fileToByteArray(java.io.File file)
                              throws java.io.IOException

Converts the whole content of a file into a byte array.

Parameters:

file - The input file. The file must exist

Returns:

The file content as a byte array

Throws:

java.io.IOException - If there was an error when reading the file