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package org.eclipse.debug.core;
/*
* (c) Copyright IBM Corp. 2000, 2001.
* All Rights Reserved.
*/
import org.eclipse.debug.core.model.IExpression;
/**
* The expression manager manages the collection of registered
* expressions in the workspace. An expression is a snippet of code
* that can be evaluated to produce a value. Expression creation
* and evaluation are client responsibilities.
* <p>
* Clients interested in expression change notification may
* register with the expression manager - see
* <code>IExpressionListener</code>.
* </p>
* <p>
* This interface is not intended to be implemented by clients.
* </p>
* @see IExpression
* @see IExpressionListener
* @since 2.0
*/
public interface IExpressionManager {
/**
* Adds the given expression to the collection of registered expressions
* in the workspace and notifies all registered listeners. This has no effect
* if the given expression is already registered.
*
* @param expression the expression to add
*/
public void addExpression(IExpression expression);
/**
* Returns a collection of all registered expressions,
* possibly empty.
*
* @return an array of expressions
*/
public IExpression[] getExpressions();
/**
* Returns whether there are any registered expressions
*
* @return whether there are any registered expressions
*/
public boolean hasExpressions();
/**
* Returns a collection of all expressions registered for the
* given debug model,possibly empty.
*
* @param modelIdentifier identifier of a debug model plug-in
* @return an array of expressions
*/
public IExpression[] getExpressions(String modelIdentifier);
/**
* Removes the given expression from the expression manager,
* and notifies all registered listeners. Has no effect if the
* given expression is not currently registered.
*
* @param expression the expression to remove
*/
public void removeExpression(IExpression expression);
/**
* Adds the given listener to the collection of registered expression listeners.
* Has no effect if an identical listener is already registered.
*
* @param listener the listener to add
*/
public void addExpressionListener(IExpressionListener listener);
/**
* Removes the given listener from the collection of registered expression listeners.
* Has no effect if an identical listener is not already registered.
*
* @param listener the listener to remove
*/
public void removeExpressionListener(IExpressionListener listener);
}
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