groovy.lang

## Class GroovyClassLoader

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

All Implemented Interfaces:
  Closeable, AutoCloseable

Direct Known Subclasses:
  GroovyClassLoader.InnerLoader

    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.

Version:
  $Revision: 21026 $
Author:
  James Strachan, Guillaume Laforge, Steve Goetze, Bing Ran, Scott Stirling, Jochen Theodorou

### Nested Class Summary

Nested Classes
`static class` `GroovyClassLoader.ClassCollector`
`static class` `GroovyClassLoader.InnerLoader`

### Field Summary

Fields
`protected Map<String,Class>` `classCache` this cache contains the loaded classes or PARSING, if the class is currently parsed
`protected Map<String,Class>` `sourceCache` This cache contains mappings of file name to class.

### Constructor Summary

Constructors
Constructor and Description
`GroovyClassLoader()` creates a GroovyClassLoader using the current Thread's context Class loader as parent.
`GroovyClassLoader(ClassLoader loader)` creates a GroovyClassLoader using the given ClassLoader as parent
`GroovyClassLoader(ClassLoader loader, CompilerConfiguration config)` creates a GroovyClassLoader using the given ClassLoader as parent.
`GroovyClassLoader(ClassLoader parent, CompilerConfiguration config, boolean useConfigurationClasspath)` creates a GroovyClassLoader.
`GroovyClassLoader(GroovyClassLoader parent)` creates a GroovyClassLoader using the given GroovyClassLoader as parent.

### Method Summary

Methods
`void` `addClasspath(String path)` adds a classpath to this classloader.
`void` `addURL(URL url)` adds a URL to the classloader.
`void` `clearCache()` Removes all classes from the class cache.
`protected GroovyClassLoader.ClassCollector` `createCollector(CompilationUnit unit, SourceUnit su)` creates a ClassCollector for a new compilation.
`protected CompilationUnit` `createCompilationUnit(CompilerConfiguration config, CodeSource source)` creates a new CompilationUnit.
`Class` `defineClass(ClassNode classNode, String file)` Deprecated.
`Class` `defineClass(ClassNode classNode, String file, String newCodeBase)` Loads the given class node returning the implementation Class.
`Class` `defineClass(String name, byte[] b)` open up the super class define that takes raw bytes
`protected Class` `defineClass(String name, byte[] bytecode, ProtectionDomain domain)` Deprecated.
`protected void` `expandClassPath(List pathList, String base, String classpath, boolean isManifestClasspath)` Deprecated.
`String` `generateScriptName()`
`protected Class` `getClassCacheEntry(String name)` gets a class from the class cache.
`protected String[]` `getClassPath()` gets the currently used classpath.
`Class[]` `getLoadedClasses()` Returns all Groovy classes loaded by this class loader.
`protected PermissionCollection` `getPermissions(CodeSource codeSource)`
`GroovyResourceLoader` `getResourceLoader()`
`protected long` `getTimeStamp(Class cls)` gets the time stamp of a given class.
`protected boolean` `isRecompilable(Class cls)` Indicates if a class is recompilable.
`Boolean` `isShouldRecompile()` gets the currently set recompilation mode. null means, the compiler configuration is used.
`protected boolean` `isSourceNewer(URL source, Class cls)` Decides if the given source is newer than a class.
`protected Class` `loadClass(String name, boolean resolve)` Implemented here to check package access prior to returning an already loaded class.
`Class` `loadClass(String name, boolean lookupScriptFiles, boolean preferClassOverScript)` loads a class from a file or a parent classloader.
`Class` `loadClass(String name, boolean lookupScriptFiles, boolean preferClassOverScript, boolean resolve)` loads a class from a file or a parent classloader.
`Class` `parseClass(File file)` Parses the given file into a Java class capable of being run
`Class` `parseClass(GroovyCodeSource codeSource)`
`Class` `parseClass(GroovyCodeSource codeSource, boolean shouldCacheSource)` Parses the given code source into a Java class.
`Class` `parseClass(InputStream in)` Deprecated. Prefer using methods taking a Reader rather than an InputStream to avoid wrong encoding issues.
`Class` `parseClass(InputStream in, String fileName)` Deprecated. Prefer using methods taking a Reader rather than an InputStream to avoid wrong encoding issues.
`Class` `parseClass(String text)` Parses the given text into a Java class capable of being run
`Class` `parseClass(String text, String fileName)` Parses the given text into a Java class capable of being run
`protected Class` `recompile(URL source, String className, Class oldClass)` (Re)Compiles the given source.
`protected void` `removeClassCacheEntry(String name)` removes a class from the class cache.
`protected void` `setClassCacheEntry(Class cls)` sets an entry in the class cache.
`void` `setResourceLoader(GroovyResourceLoader resourceLoader)`
`void` `setShouldRecompile(Boolean mode)` sets if the recompilation should be enable.

### Methods inherited from class java.net.URLClassLoader

`close, definePackage, findClass, findResource, findResources, getURLs, newInstance, newInstance`

### Methods inherited from class java.security.SecureClassLoader

`defineClass, defineClass`

### Methods inherited from class java.lang.ClassLoader

`clearAssertionStatus, defineClass, defineClass, defineClass, defineClass, definePackage, findLibrary, findLoadedClass, findSystemClass, getClassLoadingLock, getPackage, getPackages, getParent, getResource, getResourceAsStream, getResources, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, loadClass, registerAsParallelCapable, resolveClass, setClassAssertionStatus, setDefaultAssertionStatus, setPackageAssertionStatus, setSigners`

### Methods inherited from class java.lang.Object

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

### Field Detail

#### classCache

    protected final Map<String,Class> classCache

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

#### sourceCache

    protected final Map<String,Class> sourceCache

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

### Constructor Detail

#### 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.

### Method Detail

#### setResourceLoader

    public void setResourceLoader(GroovyResourceLoader resourceLoader)

#### getResourceLoader

    public GroovyResourceLoader getResourceLoader()

#### defineClass

    public Class defineClass(ClassNode classNode,
                    String file)

Deprecated.
Loads the given class node returning the implementation Class

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

#### parseClass

    public Class parseClass(File file)
                     throws CompilationFailedException,
                            IOException

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
Throws:
  `CompilationFailedException`
  `IOException`

#### parseClass

    public Class parseClass(String text,
                   String fileName)
                     throws CompilationFailedException

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
Throws:
  `CompilationFailedException`

#### parseClass

    public Class parseClass(String text)
                     throws CompilationFailedException

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
Throws:
  `CompilationFailedException`

#### parseClass

    public Class parseClass(InputStream in)
                     throws CompilationFailedException

Deprecated. Prefer using methods taking a Reader rather than an InputStream to avoid wrong encoding issues.
Parses the given character stream into a Java class capable of being run

Parameters:
  `in` - an InputStream
Returns:
  the main class defined in the given script
Throws:
  `CompilationFailedException`

#### generateScriptName

    public String generateScriptName()

#### parseClass

    public Class parseClass(InputStream in,
                   String fileName)
                     throws CompilationFailedException

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

Throws:
  `CompilationFailedException`

#### parseClass

    public Class parseClass(GroovyCodeSource codeSource)
                     throws CompilationFailedException

Throws:
  `CompilationFailedException`

#### parseClass

    public Class parseClass(GroovyCodeSource codeSource,
                   boolean shouldCacheSource)
                     throws CompilationFailedException

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
Throws:
  `CompilationFailedException`

#### getClassPath

    protected String[] getClassPath()

gets the currently used classpath.

Returns:
  a String[] containing the file information of the urls
See Also:
  `URLClassLoader.getURLs()`

#### expandClassPath

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

Deprecated.
expands the classpath

Parameters:
  `pathList` - an empty list that will contain the elements of the classpath
  `classpath` - the classpath specified as a single string

#### defineClass

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

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

#### getPermissions

    protected PermissionCollection getPermissions(CodeSource codeSource)

Overrides:
  `getPermissions` in class `URLClassLoader`

#### 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

#### 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

#### defineClass

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

open up the super class define that takes raw bytes

#### loadClass

    public Class loadClass(String name,
                  boolean lookupScriptFiles,
                  boolean preferClassOverScript)
                    throws ClassNotFoundException,
                           CompilationFailedException

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
  `ClassNotFoundException`

#### 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()`

#### setClassCacheEntry

    protected void setClassCacheEntry(Class cls)

sets an entry in the class cache.

Parameters:
  `cls` - the class
See Also:
  `removeClassCacheEntry(String)`, `getClassCacheEntry(String)`, `clearCache()`

#### 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()`

#### addURL

    public void addURL(URL url)

adds a URL to the classloader.

Overrides:
  `addURL` in class `URLClassLoader`
Parameters:
  `url` - the new classpath element

#### 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)`

#### 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`

#### 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

#### loadClass

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

loads a class from a file or a parent classloader.

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(java.lang.String, boolean)
Returns:
  the class found or the class created from a file lookup
Throws:
  `ClassNotFoundException` - if the class could not be found
  `CompilationFailedException` - if the source file could not be compiled

#### recompile

    protected Class recompile(URL source,
                  String className,
                  Class oldClass)
                       throws CompilationFailedException,
                              IOException

(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.

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
Throws:
  `CompilationFailedException` - if the compilation failed
  `IOException` - if the source is not readable
See Also:
  `isSourceNewer(URL, Class)`

#### loadClass

    protected Class loadClass(String name,
                  boolean resolve)
                       throws ClassNotFoundException

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

Overrides:
  `loadClass` in class `ClassLoader`
Throws:
  `CompilationFailedException` - if the compilation failed
  `ClassNotFoundException` - if the class was not found
See Also:
  `ClassLoader.loadClass(java.lang.String, boolean)`

#### 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

#### isSourceNewer

    protected boolean isSourceNewer(URL source,
                        Class cls)
                             throws IOException

Decides if the given source is newer than a class.

Parameters:
  `source` - the source we may want to compile
  `cls` - the former class
Returns:
  true if the source is newer, false else
Throws:
  `IOException` - if it is not possible to open an connection for the given source
See Also:
  `getTimeStamp(Class)`

#### 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)`

#### getLoadedClasses

    public Class[] getLoadedClasses()

Returns all Groovy classes loaded by this class loader.

Returns:
  all classes loaded by this class loader

#### clearCache

    public void clearCache()

Removes all classes from the class cache.

See Also:
  `getClassCacheEntry(String)`, `setClassCacheEntry(Class)`, `removeClassCacheEntry(String)`