groovy.lang
[Java] Class GroovyClassLoader

java.lang.Object
  java.lang.ClassLoader
      java.security.SecureClassLoader
          java.net.URLClassLoader
              groovy.lang.GroovyClassLoader

public class GroovyClassLoader
extends URLClassLoader

A ClassLoader which can load Groovy classes. The loaded classes are cached, classes from other classloaders should not be cached. To be able to load a script that was asked for earlier but was created later it is essential not to keep anything like a "class not found" information for that class name. This includes possible parent loaders. Classes that are not cached are always reloaded.

Authors:

James Strachan

Guillaume Laforge

Steve Goetze

Bing Ran

Scott Stirling

Jochen Theodorou

Version:

\$Revision\$

classCache

protected final Map classCache

this cache contains the loaded classes or PARSING, if the class is currently parsed

sourceCache

protected final Map sourceCache

This cache contains mappings of file name to class. It is used to bypass compilation.

GroovyClassLoader

public GroovyClassLoader()

creates a GroovyClassLoader using the current Thread's context Class loader as parent.

GroovyClassLoader

public GroovyClassLoader(ClassLoader loader)

creates a GroovyClassLoader using the given ClassLoader as parent

GroovyClassLoader

public GroovyClassLoader(GroovyClassLoader parent)

creates a GroovyClassLoader using the given GroovyClassLoader as parent. This loader will get the parent's CompilerConfiguration

GroovyClassLoader

public GroovyClassLoader(ClassLoader parent, CompilerConfiguration config, boolean useConfigurationClasspath)

creates a GroovyClassLoader.

Parameters:

parent - the parent class loader

config - the compiler configuration

useConfigurationClasspath - determines if the configurations classpath should be added

GroovyClassLoader

public GroovyClassLoader(ClassLoader loader, CompilerConfiguration config)

creates a GroovyClassLoader using the given ClassLoader as parent.

addClasspath

public void addClasspath(String path)

adds a classpath to this classloader.

Parameters:

path - is a jar file or a directory.

See Also:

addURL(URL)

addURL

public void addURL(URL url)

adds a URL to the classloader.

Parameters:

url - the new classpath element

clearCache

public void clearCache()

Removes all classes from the class cache.

See Also:

getClassCacheEntry(String)

setClassCacheEntry(Class)

removeClassCacheEntry(String)

createCollector

protected GroovyClassLoader.ClassCollector createCollector(CompilationUnit unit, SourceUnit su)

creates a ClassCollector for a new compilation.

Parameters:

unit - the compilationUnit

su - the SourceUnit

Returns:

the ClassCollector

createCompilationUnit

protected CompilationUnit createCompilationUnit(CompilerConfiguration config, CodeSource source)

creates a new CompilationUnit. If you want to add additional phase operations to the CompilationUnit (for example to inject additional methods, variables, fields), then you should overwrite this method.

Parameters:

config - the compiler configuration, usually the same as for this class loader

source - the source containing the initial file to compile, more files may follow during compilation

Returns:

the CompilationUnit

defineClass

public Class defineClass(ClassNode classNode, String file)

Loads the given class node returning the implementation Class

deprecated:

Parameters:

classNode

Returns:

a class

defineClass

public Class defineClass(ClassNode classNode, String file, String newCodeBase)

Loads the given class node returning the implementation Class.

WARNING: this compilation is not synchronized

Parameters:

classNode

Returns:

a class

defineClass

protected Class defineClass(String name, byte[] bytecode, ProtectionDomain domain)

A helper method to allow bytecode to be loaded. spg changed name to defineClass to make it more consistent with other ClassLoader methods

deprecated:

defineClass

public Class defineClass(String name, byte[] b)

open up the super class define that takes raw bytes

expandClassPath

protected void expandClassPath(List pathList, String base, String classpath, boolean isManifestClasspath)

expands the classpath

deprecated:

Parameters:

pathList - an empty list that will contain the elements of the classpath

classpath - the classpath specified as a single string

generateScriptName

public String generateScriptName()

getClassCacheEntry

protected Class getClassCacheEntry(String name)

gets a class from the class cache. This cache contains only classes loaded through this class loader or an InnerLoader instance. If no class is stored for a specific name, then the method should return null.

Parameters:

name - of the class

Returns:

the class stored for the given name

See Also:

removeClassCacheEntry(String)

setClassCacheEntry(Class)

clearCache()

getClassPath

protected String[] getClassPath()

gets the currently used classpath.

Returns:

a String[] containing the file information of the urls

See Also:

getURLs()

getLoadedClasses

public Class[] getLoadedClasses()

Returns all Groovy classes loaded by this class loader.

Returns:

all classes loaded by this class loader

getPermissions

protected PermissionCollection getPermissions(CodeSource codeSource)

getResourceLoader

public GroovyResourceLoader getResourceLoader()

getTimeStamp

protected long getTimeStamp(Class cls)

gets the time stamp of a given class. For groovy generated classes this usually means to return the value of the static field __timeStamp. If the parameter doesn't have such a field, then Long.MAX_VALUE is returned

Parameters:

cls - the class

Returns:

the time stamp

isRecompilable

protected boolean isRecompilable(Class cls)

Indicates if a class is recompilable. Recompilable means, that the classloader will try to locate a groovy source file for this class and then compile it again, adding the resulting class as entry to the cache. Giving null as class is like a recompilation, so the method should always return true here. Only classes that are implementing GroovyObject are compilable and only if the timestamp in the class is lower than Long.MAX_VALUE.

NOTE: First the parent loaders will be asked and only if they don't return a class the recompilation will happen. Recompilation also only happen if the source file is newer.

Parameters:

cls - the class to be tested. If null the method should return true

Returns:

true if the class should be compiled again

See Also:

isSourceNewer(URL, Class)

isShouldRecompile

public Boolean isShouldRecompile()

gets the currently set recompilation mode. null means, the compiler configuration is used. False means no recompilation and true means that recompilation will be done if needed.

Returns:

the recompilation mode

isSourceNewer

protected boolean isSourceNewer(URL source, Class cls)

Decides if the given source is newer than a class.

throws:

IOException if it is not possible to open an connection for the given source

Parameters:

source - the source we may want to compile

cls - the former class

Returns:

true if the source is newer, false else

See Also:

getTimeStamp(Class)

loadClass

public Class loadClass(String name, boolean lookupScriptFiles, boolean preferClassOverScript)

loads a class from a file or a parent classloader. This method does call loadClass(String, boolean, boolean, boolean) with the last parameter set to false.

throws:

CompilationFailedException if compilation was not successful

loadClass

public Class loadClass(String name, boolean lookupScriptFiles, boolean preferClassOverScript, boolean resolve)

loads a class from a file or a parent classloader.

throws:

ClassNotFoundException if the class could not be found

throws:

CompilationFailedException if the source file could not be compiled

Parameters:

name - of the class to be loaded

lookupScriptFiles - if false no lookup at files is done at all

preferClassOverScript - if true the file lookup is only done if there is no class

resolve - see ClassLoader.loadClass

Returns:

the class found or the class created from a file lookup

loadClass

protected Class loadClass(String name, boolean resolve)

Implemented here to check package access prior to returning an already loaded class.

throws:

CompilationFailedException if the compilation failed

throws:

ClassNotFoundException if the class was not found

See Also:

ClassLoader.loadClass

parseClass

public Class parseClass(File file)

Parses the given file into a Java class capable of being run

Parameters:

file - the file name to parse

Returns:

the main class defined in the given script

parseClass

public Class parseClass(String text, String fileName)

Parses the given text into a Java class capable of being run

Parameters:

text - the text of the script/class to parse

fileName - the file name to use as the name of the class

Returns:

the main class defined in the given script

parseClass

public Class parseClass(String text)

Parses the given text into a Java class capable of being run

Parameters:

text - the text of the script/class to parse

Returns:

the main class defined in the given script

parseClass

public Class parseClass(InputStream in)

Parses the given character stream into a Java class capable of being run

deprecated:

Prefer using methods taking a Reader rather than an InputStream to avoid wrong encoding issues.

Parameters:

in - an InputStream

Returns:

the main class defined in the given script

parseClass

public Class parseClass(InputStream in, String fileName)

deprecated:

Prefer using methods taking a Reader rather than an InputStream to avoid wrong encoding issues.

parseClass

public Class parseClass(GroovyCodeSource codeSource)

parseClass

public Class parseClass(GroovyCodeSource codeSource, boolean shouldCacheSource)

Parses the given code source into a Java class. If there is a class file for the given code source, then no parsing is done, instead the cached class is returned.

Parameters:

shouldCacheSource - if true then the generated class will be stored in the source cache

Returns:

the main class defined in the given script

recompile

protected Class recompile(URL source, String className, Class oldClass)

(Re)Compiles the given source. This method starts the compilation of a given source, if the source has changed since the class was created. For this isSourceNewer is called.

throws:

CompilationFailedException if the compilation failed

throws:

IOException if the source is not readable

Parameters:

source - the source pointer for the compilation

className - the name of the class to be generated

oldClass - a possible former class

Returns:

the old class if the source wasn't new enough, the new class else

See Also:

isSourceNewer(URL, Class)

removeClassCacheEntry

protected void removeClassCacheEntry(String name)

removes a class from the class cache.

Parameters:

name - of the class

See Also:

getClassCacheEntry(String)

setClassCacheEntry(Class)

clearCache()

setClassCacheEntry

protected void setClassCacheEntry(Class cls)

sets an entry in the class cache.

Parameters:

cls - the class

See Also:

removeClassCacheEntry(String)

getClassCacheEntry(String)

clearCache()

setResourceLoader

public void setResourceLoader(GroovyResourceLoader resourceLoader)

setShouldRecompile

public void setShouldRecompile(Boolean mode)

sets if the recompilation should be enable. There are 3 possible values for this. Any value different than null overrides the value from the compiler configuration. true means to recompile if needed false means to never recompile.

Parameters:

mode - the recompilation mode

See Also:

CompilerConfiguration

Copyright © 2003-2011 The Codehaus. All rights reserved.