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[Java] Class LoaderConfiguration

org.codehaus.groovy.tools.LoaderConfiguration

public class LoaderConfiguration
extends Object

Class used to configure a RootLoader from a stream or by using its methods.

The stream can be for example a FileInputStream from a file with the following format:

 # comment
 main is classname
 load path
 load file
 load pathWith${property}
 load pathWith!{required.property}
 load path/*.jar
 load path/**/*.jar

All lines starting with "#" are ignored.
The "main is" part may only be once in the file. The String afterwards is the name of a class with a main method.
The "load" command will add the given file or path to the classpath in this configuration object. If the path does not exist, the path will be ignored.
properties referenced using !{x} are required.
properties referenced using ${x} are not required. If the property does not exist the whole load instruction line will be ignored.
* is used to match zero or more characters in a file.
** is used to match zero or more directories.
Loading paths with load ./*.jar or load *.jar are not supported.

Defining the main class is required unless setRequireMain(boolean) is called with false, before reading the configuration. You can use the wildcard "*" to filter the path, but only for files, not directories. To match directories use "**". The ${propertyname} is replaced by the value of the system's property name. You can use user.home here for example. If the property does not exist, an empty string will be used. If the path or file after the load command does not exist, the path will be ignored.

See Also:: RootLoader

Constructor Summary

Constructors
Constructor and description
`LoaderConfiguration ()` creates a new loader configuration

Methods Summary

Methods
Type Params	Return Type	Name and description
	`public void`	`addClassPath(String path)` Adds a classpath to this configuration.
	`public void`	`addFile(File file)` Adds a file to the classpath if it exists.
	`public void`	`addFile(String filename)` Adds a file to the classpath if it exists.
	`public void`	`configure(InputStream is)` configures this loader with a stream
	`public URL[]`	`getClassPathUrls()` The classpath as URL[] from this configuration.
	`public List<String>`	`getGrabUrls()` The extra grab configuration.
	`public String`	`getMainClass()` Returns the name of the main class for this configuration.
	`public void`	`setMainClass(String classname)` Sets the main class.
	`public void`	`setRequireMain(boolean requireMain)` Determines if a main class is required when calling.

Inherited Methods Summary

Inherited Methods
Methods inherited from class	Name
`class Object`	`wait, wait, wait, equals, toString, hashCode, getClass, notify, notifyAll`

Constructor Detail

public LoaderConfiguration()

creates a new loader configuration

Method Detail

public void addClassPath(String path)

Adds a classpath to this configuration. It expects a string with multiple paths, separated by the system dependent path separator. Expands wildcards, e.g. dir/* into all the jars in dir.

Parameters:: path - the path as a path separator delimited string

See Also:: File.pathSeparator

public void addFile(File file)

Adds a file to the classpath if it exists.

Parameters:: file - the file to add

public void addFile(String filename)

Adds a file to the classpath if it exists.

Parameters:: filename - the name of the file to add

public void configure(InputStream is)

configures this loader with a stream

throws:: IOException if reading or parsing the contents of the stream fails

Parameters:: is - stream used to read the configuration

public URL[] getClassPathUrls()

The classpath as URL[] from this configuration. This can be used to construct a class loader.

Returns:: the classpath

See Also:: URLClassLoader

public List<String> getGrabUrls()

The extra grab configuration.

Returns:: the list of grab urls

public String getMainClass()

Returns the name of the main class for this configuration.

Returns:: the name of the main class or null if not defined

public void setMainClass(String classname)

Sets the main class. If there is already a main class it is overwritten. Calling configure(InputStream) after calling this method does not require a main class definition inside the stream.

Parameters:: classname - the name to become the main class

public void setRequireMain(boolean requireMain)

Determines if a main class is required when calling.

Parameters:: requireMain - set to false if no main class is required

See Also:: configure(InputStream)

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Licensed under the Apache license.
https://docs.groovy-lang.org/3.0.7/html/gapi/org/codehaus/groovy/tools/LoaderConfiguration.html