org.codehaus.janino
Class ScriptEvaluator

java.lang.Object
  org.codehaus.commons.compiler.Cookable
      org.codehaus.janino.SimpleCompiler
          org.codehaus.janino.ClassBodyEvaluator
              org.codehaus.janino.ScriptEvaluator

All Implemented Interfaces:

IClassBodyEvaluator, ICookable, IScriptEvaluator, ISimpleCompiler

Direct Known Subclasses:

ExpressionEvaluator

public class ScriptEvaluator
extends ClassBodyEvaluator
implements IScriptEvaluator

A number of "convenience constructors" exist that execute the setup steps instantly. Their use is discouraged.

Field Summary

protected boolean[]	optionalOverrideMethod Whether methods override a method declared by a supertype; null means "none".
protected Class[]	optionalReturnTypes The methods' return types; null means "none".
protected boolean[]	optionalStaticMethod Whether methods are static; null means "all".

Fields inherited from interface org.codehaus.commons.compiler.IClassBodyEvaluator

DEFAULT_CLASS_NAME

Fields inherited from interface org.codehaus.commons.compiler.ICookable

BOOT_CLASS_LOADER, SYSTEM_PROPERTY_SOURCE_DEBUGGING_DIR, SYSTEM_PROPERTY_SOURCE_DEBUGGING_ENABLE

Constructor Summary

ScriptEvaluator()
Constructs a script evaluator with all the default settings (return type void

ScriptEvaluator(Scanner scanner, Class optionalExtendedType, Class[] implementedTypes, Class returnType, String[] parameterNames, Class[] parameterTypes, Class[] thrownExceptions, ClassLoader optionalParentClassLoader)
Equivalent to ScriptEvaluator se = new ScriptEvaluator(); se.setExtendedType(optionalExtendedType); se.setImplementedTypes(implementedTypes); se.setReturnType(returnType); se.setParameters(parameterNames, parameterTypes); se.setThrownExceptions(thrownExceptions); se.setParentClassLoader(optionalParentClassLoader); se.cook(scanner);

ScriptEvaluator(Scanner scanner, Class returnType, String[] parameterNames, Class[] parameterTypes, Class[] thrownExceptions, ClassLoader optionalParentClassLoader)
Equivalent to ScriptEvaluator se = new ScriptEvaluator(); se.setReturnType(returnType); se.setParameters(parameterNames, parameterTypes); se.setThrownExceptions(thrownExceptions); se.setParentClassLoader(optionalParentClassLoader); se.cook(scanner);

ScriptEvaluator(Scanner scanner, String className, Class optionalExtendedType, Class[] implementedTypes, boolean staticMethod, Class returnType, String methodName, String[] parameterNames, Class[] parameterTypes, Class[] thrownExceptions, ClassLoader optionalParentClassLoader)
Equivalent to ScriptEvaluator se = new ScriptEvaluator(); se.setClassName(className); se.setExtendedType(optionalExtendedType); se.setImplementedTypes(implementedTypes); se.setStaticMethod(staticMethod); se.setReturnType(returnType); se.setMethodName(methodName); se.setParameters(parameterNames, parameterTypes); se.setThrownExceptions(thrownExceptions); se.setParentClassLoader(optionalParentClassLoader); se.cook(scanner);

ScriptEvaluator(String script)
Equivalent to ScriptEvaluator se = new ScriptEvaluator(); se.cook(script);

ScriptEvaluator(String script, Class returnType)
Equivalent to ScriptEvaluator se = new ScriptEvaluator(); se.setReturnType(returnType); se.cook(script);

ScriptEvaluator(String script, Class returnType, String[] parameterNames, Class[] parameterTypes)
Equivalent to ScriptEvaluator se = new ScriptEvaluator(); se.setReturnType(returnType); se.setParameters(parameterNames, parameterTypes); se.cook(script);

ScriptEvaluator(String script, Class returnType, String[] parameterNames, Class[] parameterTypes, Class[] thrownExceptions)
Equivalent to ScriptEvaluator se = new ScriptEvaluator(); se.setReturnType(returnType); se.setParameters(parameterNames, parameterTypes); se.setThrownExceptions(thrownExceptions); se.cook(script);

ScriptEvaluator(String optionalFileName, InputStream is, Class returnType, String[] parameterNames, Class[] parameterTypes, Class[] thrownExceptions, ClassLoader optionalParentClassLoader)
Equivalent to ScriptEvaluator se = new ScriptEvaluator(); se.setReturnType(returnType); se.setParameters(parameterNames, parameterTypes); se.setThrownExceptions(thrownExceptions); se.setParentClassLoader(optionalParentClassLoader); se.cook(optionalFileName, is);

ScriptEvaluator(String optionalFileName, Reader reader, Class returnType, String[] parameterNames, Class[] parameterTypes, Class[] thrownExceptions, ClassLoader optionalParentClassLoader)
Equivalent to ScriptEvaluator se = new ScriptEvaluator(); se.setReturnType(returnType); se.setParameters(parameterNames, parameterTypes); se.setThrownExceptions(thrownExceptions); se.setParentClassLoader(optionalParentClassLoader); se.cook(reader);

Method Summary

void	cook(Parser[] parsers)
void	cook(Reader[] readers) Same as ICookable.cook(Reader), but for multiple scripts.
void	cook(Scanner scanner) Scans, parses and ompiles a given compilation unit from the given scanner.
void	cook(Scanner[] scanners) Like cook(Scanner), but cooks a set of scripts into one class.
void	cook(String[] strings) Same as ICookable.cook(String), but for multiple scripts.
void	cook(String[] optionalFileNames, Reader[] readers) On a 2 GHz Intel Pentium Core Duo under Windows XP with an IBM 1.4.2 JDK, compiling 10000 expressions "a + b" (integer) takes about 4 seconds and 56 MB of main memory.
void	cook(String[] optionalFileNames, String[] strings) Same as ICookable.cook(String, String), but for multiple scripts.
Object	createFastEvaluator(Reader reader, Class interfaceToImplement, String[] parameterNames) If the parameter and return types of the expression are known at compile time, then a "fast" script evaluator can be instantiated through this method.
Object	createFastEvaluator(Scanner scanner, Class interfaceToImplement, String[] parameterNames) Notice: This method is not declared in IScriptEvaluator, and is hence only available in this implementation of org.codehaus.commons.compiler.
Object	createFastEvaluator(String script, Class interfaceToImplement, String[] parameterNames)
static Object	createFastScriptEvaluator(Scanner scanner, Class interfaceToImplement, String[] parameterNames, ClassLoader optionalParentClassLoader) Deprecated. Use createFastScriptEvaluator(Scanner, String[], String, Class, Class, String[], ClassLoader) instead
static Object	createFastScriptEvaluator(Scanner scanner, String[] optionalDefaultImports, String className, Class optionalExtendedClass, Class interfaceToImplement, String[] parameterNames, ClassLoader optionalParentClassLoader) Deprecated. Use createFastEvaluator(Scanner,Class,String[]) instead:
static Object	createFastScriptEvaluator(Scanner scanner, String className, Class optionalExtendedType, Class interfaceToImplement, String[] parameterNames, ClassLoader optionalParentClassLoader) Deprecated. Use createFastScriptEvaluator(Scanner, String[], String, Class, Class, String[], ClassLoader) instead
static Object	createFastScriptEvaluator(String script, Class interfaceToImplement, String[] parameterNames) Deprecated. Use createFastScriptEvaluator(Scanner, String[], String, Class, Class, String[], ClassLoader) instead
Object	createInstance(Reader reader) Don't use.
Object	evaluate(int idx, Object[] arguments) Same as IScriptEvaluator.evaluate(Object[]), but for multiple scripts.
Object	evaluate(Object[] arguments) Calls the script with concrete parameter values.
protected Class	getDefaultReturnType()
Method	getMethod() Returns the loaded Method.
Method	getMethod(int idx) Same as IScriptEvaluator.getMethod(), but for multiple scripts.
static String[]	guessParameterNames(Scanner scanner) Guess the names of the parameters used in the given expression.
protected Java.MethodDeclarator	makeMethodDeclaration(Location location, Java.Annotation[] annotations, boolean staticMethod, Class returnType, String methodName, Class[] parameterTypes, String[] parameterNames, Class[] thrownExceptions, List<Java.BlockStatement> statements) To the given Java.ClassDeclaration, add A public method declaration with the given return type, name, parameter names and values and thrown exceptions A block
protected List<Java.BlockStatement>	makeStatements(int idx, Parser parser) Fills the given block by parsing statements until EOF and adding them to the block.
void	setMethodName(String methodName) Define the name of the generated method.
void	setMethodNames(String[] methodNames) Same as IScriptEvaluator.setMethodName(String), but for multiple scripts.
void	setOverrideMethod(boolean overrideMethod) Defines whether the generated method overrides a methods declared in a supertype.
void	setOverrideMethod(boolean[] overrideMethod) Same as IScriptEvaluator.setOverrideMethod(boolean), but for multiple scripts.
void	setParameters(String[][] parameterNames, Class[][] parameterTypes) Same as IScriptEvaluator.setParameters(String[], Class[]), but for multiple scripts.
void	setParameters(String[] parameterNames, Class[] parameterTypes) Define the names and types of the parameters of the generated method.
void	setReturnType(Class returnType) Defines the return types of the generated methods.
void	setReturnTypes(Class[] returnTypes) Defines the return types of the generated methods.
void	setStaticMethod(boolean staticMethod) Defines whether the generated method should be STATIC or not.
void	setStaticMethod(boolean[] staticMethod) Same as IScriptEvaluator.setStaticMethod(boolean), but for multiple scripts.
void	setThrownExceptions(Class[] thrownExceptions) Define the exceptions that the generated method may throw.
void	setThrownExceptions(Class[][] thrownExceptions) Same as IScriptEvaluator.setThrownExceptions(Class[]), but for multiple scripts.

Methods inherited from class org.codehaus.janino.ClassBodyEvaluator

addPackageMemberClassDeclaration, compileToClass, createFastClassBodyEvaluator, createFastClassBodyEvaluator, getClazz, makeCompilationUnit, setClassName, setDefaultImports, setExtendedClass, setExtendedType, setImplementedInterfaces, setImplementedTypes

Methods inherited from class org.codehaus.janino.SimpleCompiler

assertNotCooked, classesToTypes, classToType, compileToClassLoader, cook, cook, equals, getClassLoader, hashCode, main, setCompileErrorHandler, setDebuggingInformation, setParentClassLoader, setWarningHandler

Methods inherited from class org.codehaus.commons.compiler.Cookable

cook, cook, cook, cook, cook, cook, cook, cookFile, cookFile, cookFile, cookFile, readString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.codehaus.commons.compiler.IClassBodyEvaluator

getClazz, setClassName, setDefaultImports, setExtendedClass, setExtendedType, setImplementedInterfaces, setImplementedTypes

Methods inherited from interface org.codehaus.commons.compiler.ICookable

cook, cook, cook, cook, cook, cook, cook, cook, cookFile, cookFile, cookFile, cookFile, setCompileErrorHandler, setDebuggingInformation, setParentClassLoader, setWarningHandler

Field Detail

optionalOverrideMethod

protected boolean[] optionalOverrideMethod

Whether methods override a method declared by a supertype; null means "none".

optionalStaticMethod

protected boolean[] optionalStaticMethod

Whether methods are static; null means "all".

optionalReturnTypes

protected Class[] optionalReturnTypes

The methods' return types; null means "none".

Constructor Detail

ScriptEvaluator

public ScriptEvaluator(String script)
                throws CompileException

Equivalent to

 ScriptEvaluator se = new ScriptEvaluator();
 se.cook(script);

Throws:

CompileException

See Also:

ScriptEvaluator(), Cookable.cook(String)

ScriptEvaluator

public ScriptEvaluator(String script,
                       Class returnType)
                throws CompileException

Equivalent to

 ScriptEvaluator se = new ScriptEvaluator();
 se.setReturnType(returnType);
 se.cook(script);

Throws:

CompileException

See Also:

ScriptEvaluator(), setReturnType(Class), Cookable.cook(String)

ScriptEvaluator

public ScriptEvaluator(String script,
                       Class returnType,
                       String[] parameterNames,
                       Class[] parameterTypes)
                throws CompileException

Equivalent to

 ScriptEvaluator se = new ScriptEvaluator();
 se.setReturnType(returnType);
 se.setParameters(parameterNames, parameterTypes);
 se.cook(script);

Throws:

CompileException

See Also:

ScriptEvaluator(), setReturnType(Class), setParameters(String[], Class[]), Cookable.cook(String)

ScriptEvaluator

public ScriptEvaluator(String script,
                       Class returnType,
                       String[] parameterNames,
                       Class[] parameterTypes,
                       Class[] thrownExceptions)
                throws CompileException

Equivalent to

 ScriptEvaluator se = new ScriptEvaluator();
 se.setReturnType(returnType);
 se.setParameters(parameterNames, parameterTypes);
 se.setThrownExceptions(thrownExceptions);
 se.cook(script);

Throws:

CompileException

See Also:

ScriptEvaluator(), setReturnType(Class), setParameters(String[], Class[]), setThrownExceptions(Class[]), Cookable.cook(String)

ScriptEvaluator

public ScriptEvaluator(String optionalFileName,
                       InputStream is,
                       Class returnType,
                       String[] parameterNames,
                       Class[] parameterTypes,
                       Class[] thrownExceptions,
                       ClassLoader optionalParentClassLoader)
                throws CompileException,
                       IOException

Equivalent to

 ScriptEvaluator se = new ScriptEvaluator();
 se.setReturnType(returnType);
 se.setParameters(parameterNames, parameterTypes);
 se.setThrownExceptions(thrownExceptions);
 se.setParentClassLoader(optionalParentClassLoader);
 se.cook(optionalFileName, is);

Throws:

CompileException

IOException

See Also:

ScriptEvaluator(), setReturnType(Class), setParameters(String[], Class[]), setThrownExceptions(Class[]), SimpleCompiler.setParentClassLoader(ClassLoader), Cookable.cook(String, InputStream)

ScriptEvaluator

public ScriptEvaluator(String optionalFileName,
                       Reader reader,
                       Class returnType,
                       String[] parameterNames,
                       Class[] parameterTypes,
                       Class[] thrownExceptions,
                       ClassLoader optionalParentClassLoader)
                throws CompileException,
                       IOException

Equivalent to

 ScriptEvaluator se = new ScriptEvaluator();
 se.setReturnType(returnType);
 se.setParameters(parameterNames, parameterTypes);
 se.setThrownExceptions(thrownExceptions);
 se.setParentClassLoader(optionalParentClassLoader);
 se.cook(reader);

Throws:

CompileException

IOException

See Also:

ScriptEvaluator(), setReturnType(Class), setParameters(String[], Class[]), setThrownExceptions(Class[]), SimpleCompiler.setParentClassLoader(ClassLoader), Cookable.cook(String, Reader)

ScriptEvaluator

public ScriptEvaluator(Scanner scanner,
                       Class returnType,
                       String[] parameterNames,
                       Class[] parameterTypes,
                       Class[] thrownExceptions,
                       ClassLoader optionalParentClassLoader)
                throws CompileException,
                       IOException

Equivalent to

 ScriptEvaluator se = new ScriptEvaluator();
 se.setReturnType(returnType);
 se.setParameters(parameterNames, parameterTypes);
 se.setThrownExceptions(thrownExceptions);
 se.setParentClassLoader(optionalParentClassLoader);
 se.cook(scanner);

Throws:

CompileException

IOException

See Also:

ScriptEvaluator(), setReturnType(Class), setParameters(String[], Class[]), setThrownExceptions(Class[]), SimpleCompiler.setParentClassLoader(ClassLoader), Cookable.cook(Reader)

ScriptEvaluator

public ScriptEvaluator(Scanner scanner,
                       Class optionalExtendedType,
                       Class[] implementedTypes,
                       Class returnType,
                       String[] parameterNames,
                       Class[] parameterTypes,
                       Class[] thrownExceptions,
                       ClassLoader optionalParentClassLoader)
                throws CompileException,
                       IOException

Equivalent to

 ScriptEvaluator se = new ScriptEvaluator();
 se.setExtendedType(optionalExtendedType);
 se.setImplementedTypes(implementedTypes);
 se.setReturnType(returnType);
 se.setParameters(parameterNames, parameterTypes);
 se.setThrownExceptions(thrownExceptions);
 se.setParentClassLoader(optionalParentClassLoader);
 se.cook(scanner);

Throws:

CompileException

IOException

See Also:

ScriptEvaluator(), ClassBodyEvaluator.setExtendedClass(Class), ClassBodyEvaluator.setImplementedInterfaces(Class[]), setReturnType(Class), setParameters(String[], Class[]), setThrownExceptions(Class[]), SimpleCompiler.setParentClassLoader(ClassLoader), Cookable.cook(Reader)

ScriptEvaluator

public ScriptEvaluator(Scanner scanner,
                       String className,
                       Class optionalExtendedType,
                       Class[] implementedTypes,
                       boolean staticMethod,
                       Class returnType,
                       String methodName,
                       String[] parameterNames,
                       Class[] parameterTypes,
                       Class[] thrownExceptions,
                       ClassLoader optionalParentClassLoader)
                throws CompileException,
                       IOException

Equivalent to

 ScriptEvaluator se = new ScriptEvaluator();
 se.setClassName(className);
 se.setExtendedType(optionalExtendedType);
 se.setImplementedTypes(implementedTypes);
 se.setStaticMethod(staticMethod);
 se.setReturnType(returnType);
 se.setMethodName(methodName);
 se.setParameters(parameterNames, parameterTypes);
 se.setThrownExceptions(thrownExceptions);
 se.setParentClassLoader(optionalParentClassLoader);
 se.cook(scanner);

Throws:

CompileException

IOException

See Also:

ScriptEvaluator(), ClassBodyEvaluator.setClassName(String), ClassBodyEvaluator.setExtendedClass(Class), ClassBodyEvaluator.setImplementedInterfaces(Class[]), setStaticMethod(boolean), setReturnType(Class), setMethodName(String), setParameters(String[], Class[]), setThrownExceptions(Class[]), SimpleCompiler.setParentClassLoader(ClassLoader), Cookable.cook(Reader)

ScriptEvaluator

public ScriptEvaluator()

Constructs a script evaluator with all the default settings (return type void

Method Detail

setOverrideMethod

public void setOverrideMethod(boolean overrideMethod)

Description copied from interface: IScriptEvaluator

Defines whether the generated method overrides a methods declared in a supertype.

Specified by:

setOverrideMethod in interface IScriptEvaluator

setStaticMethod

public void setStaticMethod(boolean staticMethod)

Description copied from interface: IScriptEvaluator

Defines whether the generated method should be STATIC or not. Defaults to true.

Specified by:

setStaticMethod in interface IScriptEvaluator

setReturnType

public void setReturnType(Class returnType)

Defines the return types of the generated methods.

Specified by:

setReturnType in interface IScriptEvaluator

Parameters:

returnType - The method's return type; null means the "default return type", which is the type returned by getDefaultReturnType() (void.class for ScriptEvaluator and Object.class for ExpressionEvaluator)

See Also:

getDefaultReturnType(), ExpressionEvaluator.getDefaultReturnType()

setMethodName

public void setMethodName(String methodName)

Description copied from interface: IScriptEvaluator

Define the name of the generated method. Defaults to an unspecified name.

Specified by:

setMethodName in interface IScriptEvaluator

setParameters

public void setParameters(String[] parameterNames,
                          Class[] parameterTypes)

Description copied from interface: IScriptEvaluator

Define the names and types of the parameters of the generated method.

names and types must have the same number of elements.

The parameters can be of primitive type, e.g. double.class.

The default is to have zero parameters.

Specified by:

setParameters in interface IScriptEvaluator

setThrownExceptions

public void setThrownExceptions(Class[] thrownExceptions)

Description copied from interface: IScriptEvaluator

Define the exceptions that the generated method may throw.

Specified by:

setThrownExceptions in interface IScriptEvaluator

cook

public final void cook(Scanner scanner)
                throws CompileException,
                       IOException

Description copied from class: SimpleCompiler

Scans, parses and ompiles a given compilation unit from the given scanner. After completion, SimpleCompiler.getClassLoader() returns a ClassLoader that allows for access to the compiled classes.

Overrides:

cook in class ClassBodyEvaluator

Throws:

CompileException

IOException

evaluate

public Object evaluate(Object[] arguments)
                throws InvocationTargetException

Description copied from interface: IScriptEvaluator

Calls the script with concrete parameter values.

Each argument must have the same type as specified through the parameterTypes parameter of IScriptEvaluator.setParameters(String[], Class[]).

Arguments of primitive type must passed with their wrapper class objects.

The object returned has the class as specified through IScriptEvaluator.setReturnType(Class).

This method is thread-safe.

Specified by:

evaluate in interface IScriptEvaluator

Parameters:

arguments - The actual parameter values

Throws:

InvocationTargetException

getMethod

public Method getMethod()

Description copied from interface: IScriptEvaluator

Returns the loaded Method.

This method must only be called after exactly one of the ICookable.cook(String, Reader) methods was called.

Specified by:

getMethod in interface IScriptEvaluator

setOverrideMethod

public void setOverrideMethod(boolean[] overrideMethod)

Description copied from interface: IScriptEvaluator

Same as IScriptEvaluator.setOverrideMethod(boolean), but for multiple scripts.

Specified by:

setOverrideMethod in interface IScriptEvaluator

setStaticMethod

public void setStaticMethod(boolean[] staticMethod)

Description copied from interface: IScriptEvaluator

Same as IScriptEvaluator.setStaticMethod(boolean), but for multiple scripts.

Specified by:

setStaticMethod in interface IScriptEvaluator

setReturnTypes

public void setReturnTypes(Class[] returnTypes)

Defines the return types of the generated methods.

Specified by:

setReturnTypes in interface IScriptEvaluator

Parameters:

returnTypes - The methods' return types; null elements mean the "default return type", which is the type returned by getDefaultReturnType() (void.class for ScriptEvaluator and Object.class for ExpressionEvaluator)

See Also:

getDefaultReturnType(), ExpressionEvaluator.getDefaultReturnType()

setMethodNames

public void setMethodNames(String[] methodNames)

Description copied from interface: IScriptEvaluator

Same as IScriptEvaluator.setMethodName(String), but for multiple scripts.

Define the names of the generated methods. By default the methods have distinct and implementation-specific names.

If two scripts have the same name, then they must have different parameter types (see IScriptEvaluator.setParameters(String[][], Class[][])).

Specified by:

setMethodNames in interface IScriptEvaluator

setParameters

public void setParameters(String[][] parameterNames,
                          Class[][] parameterTypes)

Description copied from interface: IScriptEvaluator

Same as IScriptEvaluator.setParameters(String[], Class[]), but for multiple scripts.

Specified by:

setParameters in interface IScriptEvaluator

setThrownExceptions

public void setThrownExceptions(Class[][] thrownExceptions)

Description copied from interface: IScriptEvaluator

Same as IScriptEvaluator.setThrownExceptions(Class[]), but for multiple scripts.

Specified by:

setThrownExceptions in interface IScriptEvaluator

cook

public final void cook(Scanner[] scanners)
                throws CompileException,
                       IOException

Like cook(Scanner), but cooks a set of scripts into one class. Notice that if any of the scripts causes trouble, the entire compilation will fail. If you need to report which of the scripts causes the exception, you may want to use the optionalFileName argument of Scanner.Scanner(String, Reader) to distinguish between the individual token sources.

On a 2 GHz Intel Pentium Core Duo under Windows XP with an IBM 1.4.2 JDK, compiling 10000 expressions "a + b" (integer) takes about 4 seconds and 56 MB of main memory. The generated class file is 639203 bytes large.

The number and the complexity of the scripts is restricted by the Limitations of the Java Virtual Machine, where the most limiting factor is the 64K entries limit of the constant pool. Since every method with a distinct name requires one entry there, you can define at best 32K (very simple) scripts. If and only if the number of scanners is one, then that single script may contain leading IMPORT directives.

Throws:

IllegalStateException - Any of the preceeding set...() had an array size different from that of scanners

CompileException

IOException

cook

public final void cook(Parser[] parsers)
                throws CompileException,
                       IOException

Throws:

CompileException

IOException

See Also:

cook(Scanner[])

cook

public final void cook(Reader[] readers)
                throws CompileException,
                       IOException

Description copied from interface: IScriptEvaluator

Same as ICookable.cook(Reader), but for multiple scripts.

Specified by:

cook in interface IScriptEvaluator

Throws:

CompileException

IOException

cook

public final void cook(String[] optionalFileNames,
                       Reader[] readers)
                throws CompileException,
                       IOException

On a 2 GHz Intel Pentium Core Duo under Windows XP with an IBM 1.4.2 JDK, compiling 10000 expressions "a + b" (integer) takes about 4 seconds and 56 MB of main memory. The generated class file is 639203 bytes large.

The number and the complexity of the scripts is restricted by the Limitations of the Java Virtual Machine, where the most limiting factor is the 64K entries limit of the constant pool. Since every method with a distinct name requires one entry there, you can define at best 32K (very simple) scripts.

Specified by:

cook in interface IScriptEvaluator

Throws:

CompileException

IOException

cook

public final void cook(String[] strings)
                throws CompileException

Description copied from interface: IScriptEvaluator

Same as ICookable.cook(String), but for multiple scripts.

Specified by:

cook in interface IScriptEvaluator

Throws:

CompileException

cook

public final void cook(String[] optionalFileNames,
                       String[] strings)
                throws CompileException

Description copied from interface: IScriptEvaluator

Same as ICookable.cook(String, String), but for multiple scripts.

Specified by:

cook in interface IScriptEvaluator

Throws:

CompileException

getDefaultReturnType

protected Class getDefaultReturnType()

Returns:

void.class

See Also:

setReturnTypes(Class[])

makeStatements

protected List<Java.BlockStatement> makeStatements(int idx,
                                                   Parser parser)
                                            throws CompileException,
                                                   IOException

Fills the given block by parsing statements until EOF and adding them to the block.

Throws:

CompileException

IOException

makeMethodDeclaration

protected Java.MethodDeclarator makeMethodDeclaration(Location location,
                                                      Java.Annotation[] annotations,
                                                      boolean staticMethod,
                                                      Class returnType,
                                                      String methodName,
                                                      Class[] parameterTypes,
                                                      String[] parameterNames,
                                                      Class[] thrownExceptions,
                                                      List<Java.BlockStatement> statements)

To the given Java.ClassDeclaration, add

• A public method declaration with the given return type, name, parameter names and values and thrown exceptions
• A block

Parameters:

returnType - Return type of the declared method

createFastScriptEvaluator

@Deprecated
public static Object createFastScriptEvaluator(String script,
                                                          Class interfaceToImplement,
                                                          String[] parameterNames)
                                        throws CompileException

Deprecated. Use createFastScriptEvaluator(Scanner, String[], String, Class, Class, String[], ClassLoader) instead

Throws:

CompileException

createFastScriptEvaluator

@Deprecated
public static Object createFastScriptEvaluator(Scanner scanner,
                                                          Class interfaceToImplement,
                                                          String[] parameterNames,
                                                          ClassLoader optionalParentClassLoader)
                                        throws CompileException,
                                               IOException

Deprecated. Use createFastScriptEvaluator(Scanner, String[], String, Class, Class, String[], ClassLoader) instead

Throws:

CompileException

IOException

createFastScriptEvaluator

@Deprecated
public static Object createFastScriptEvaluator(Scanner scanner,
                                                          String className,
                                                          Class optionalExtendedType,
                                                          Class interfaceToImplement,
                                                          String[] parameterNames,
                                                          ClassLoader optionalParentClassLoader)
                                        throws CompileException,
                                               IOException

Deprecated. Use createFastScriptEvaluator(Scanner, String[], String, Class, Class, String[], ClassLoader) instead

Throws:

CompileException

IOException

createFastScriptEvaluator

@Deprecated
public static Object createFastScriptEvaluator(Scanner scanner,
                                                          String[] optionalDefaultImports,
                                                          String className,
                                                          Class optionalExtendedClass,
                                                          Class interfaceToImplement,
                                                          String[] parameterNames,
                                                          ClassLoader optionalParentClassLoader)
                                        throws CompileException,
                                               IOException

Deprecated. Use createFastEvaluator(Scanner,Class,String[]) instead:

 ScriptEvaluator se = new ScriptEvaluator();
 se.setDefaultImports.(optionalDefaultImports);
 se.setClassName.(className);
 se.setExtendedClass.(optionalExtendedClass);
 se.setParentClassLoader(optionalParentClassLoader);
 return se.createFastEvaluator(scanner,
 interfaceToImplement, parameterNames);
 

Throws:

CompileException

IOException

createInstance

public final Object createInstance(Reader reader)

Don't use.

Specified by:

createInstance in interface IClassBodyEvaluator

Overrides:

createInstance in class ClassBodyEvaluator

Parameters:

reader - Source of class body tokens

Returns:

An object that extends the optionalExtendedType and implements the given implementedTypes

createFastEvaluator

public Object createFastEvaluator(Reader reader,
                                  Class interfaceToImplement,
                                  String[] parameterNames)
                           throws CompileException,
                                  IOException

Description copied from interface: IScriptEvaluator

If the parameter and return types of the expression are known at compile time, then a "fast" script evaluator can be instantiated through this method.

Script evaluation is faster than through IScriptEvaluator.evaluate(Object[]), because it is not done through reflection but through direct method invocation.

Example:

 public interface Foo {
     int bar(int a, int b);
 }
 ...
 IScriptEvaluator se = CompilerFactoryFactory.getDefaultCompilerFactory().newScriptEvaluator();

 // Optionally configure the SE her:
 se.setClassName("Bar");
 se.setDefaultImports(new String[] { "java.util.*" });
 se.setExtendedClass(SomeOtherClass.class);
 se.setParentClassLoader(someClassLoader);

 Foo f = (Foo) se.createFastScriptEvaluator(
     "return a - b;",
     Foo.class,
     new String[] { "a", "b" }
 );
 System.out.println("1 - 2 = " + f.bar(1, 2));
 

All other configuration (implemented type, static method, return type, method name, parameter names and types, thrown exceptions) are predetermined by the interfaceToImplement. Notice: The interfaceToImplement must either be declared public, or with package scope in the same package as the generated class (see IClassBodyEvaluator.setClassName(String)).

Specified by:

createFastEvaluator in interface IScriptEvaluator

Parameters:

reader - Produces the stream of script tokens

interfaceToImplement - Must declare exactly one method

parameterNames - The names of the parameters of that method

Returns:

An object that implements the given interface

Throws:

CompileException

IOException

createFastEvaluator

public Object createFastEvaluator(String script,
                                  Class interfaceToImplement,
                                  String[] parameterNames)
                           throws CompileException

Specified by:

createFastEvaluator in interface IScriptEvaluator

Parameters:

script - Contains the sequence of script tokens

Throws:

CompileException

See Also:

IScriptEvaluator.createFastEvaluator(Reader, Class, String[])

createFastEvaluator

public Object createFastEvaluator(Scanner scanner,
                                  Class interfaceToImplement,
                                  String[] parameterNames)
                           throws CompileException,
                                  IOException

Notice: This method is not declared in IScriptEvaluator, and is hence only available in this implementation of org.codehaus.commons.compiler. To be independent from this particular implementation, try to switch to createFastEvaluator(Reader, Class, String[]).

Parameters:

scanner - Source of tokens to read

Throws:

CompileException

IOException

See Also:

createFastEvaluator(Reader, Class, String[])

guessParameterNames

public static String[] guessParameterNames(Scanner scanner)
                                    throws CompileException,
                                           IOException

Guess the names of the parameters used in the given expression. The strategy is to look at all "ambiguous names" in the expression (e.g. in "a.b.c.d()", the ambiguous name is "a.b.c"), and then at the components of the ambiguous name.

• If any component starts with an upper-case letter, then ambiguous name is assumed to be a type name.
• Otherwise, if the first component of the ambiguous name matches the name of a previously defined local variable, then the first component of the ambiguous name is assumed to be a local variable name. (Notice that this strategy does not consider that the scope of a local variable declaration may end before the end of the script.)
• Otherwise, the first component of the ambiguous name is assumed to be a parameter name.

Throws:

CompileException

IOException

See Also:

Scanner.Scanner(String, Reader)

evaluate

public Object evaluate(int idx,
                       Object[] arguments)
                throws InvocationTargetException

Description copied from interface: IScriptEvaluator

Same as IScriptEvaluator.evaluate(Object[]), but for multiple scripts.

Specified by:

evaluate in interface IScriptEvaluator

Throws:

InvocationTargetException

getMethod

public Method getMethod(int idx)

Description copied from interface: IScriptEvaluator

Same as IScriptEvaluator.getMethod(), but for multiple scripts.

Specified by:

getMethod in interface IScriptEvaluator