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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2002, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
// $Id$
package scala.runtime;
/** This class provides support methods for the interpreter. */
public class InterpreterSupport {
//########################################################################
// Public classes
/** This interface provides method to show definitions. */
public static interface DefinitionPrinter {
/** This method is invoked for each non-value definition. */
public void showDefinition(String signature);
/** This method is invoked for each value definition. */
public void showValueDefinition(String signature, Object value);
}
/** This class describes an evaluation result. */
public static class EvaluationResult {
/** The value of the result */
public final Object value;
/** The type of the result */
public final String type;
/** Creates a new instance */
public EvaluationResult(Object value, String type) {
this.value = value;
this.type = type;
}
}
//########################################################################
// Private Variables
private static final ThreadLocal printer = new ThreadLocal();
private static final ThreadLocal result = new ThreadLocal();
//########################################################################
// Public Functions
/** Sets the definition printer of the current thread. */
public static void setDefinitionPrinter(DefinitionPrinter object) {
printer.set(object);
}
/** Returns the definition printer of the current thread. */
public static DefinitionPrinter getDefinitionPrinter() {
return (DefinitionPrinter)printer.get();
}
/**
* This function is invoked for each non-value definition. It
* forwards the call to the current thread's definition printer.
*
* @meta method (java.lang.String, scala.Any) scala.Unit;
*/
public static void showDefinition(String signature) {
DefinitionPrinter printer = getDefinitionPrinter();
if (printer != null) printer.showDefinition(signature);
}
/**
* This method is invoked for each value definition. It forwards
* the call to the current thread's definition printer.
*
* @meta method (java.lang.String, scala.Any) scala.Unit;
*/
public static void showValueDefinition(String signature, Object value) {
DefinitionPrinter printer = getDefinitionPrinter();
if (printer != null) printer.showValueDefinition(signature, value);
}
/**
* Sets the evaluation result of the current thread.
*
* @meta method (scala.Any, java.lang.String) scala.Unit;
*/
public static void setEvaluationResult(Object value, String type) {
result.set(new EvaluationResult(value, type));
}
/**
* Returns and resets the evaluation result of the current
* thread. A null value indicates that the last evaluation had no
* result (only definitions).
*/
public static EvaluationResult getAndResetEvaluationResult() {
Object object = result.get();
result.set(null);
return (EvaluationResult)object;
}
//########################################################################
}
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