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package org.eclipse.debug.core.model;
/*
* (c) Copyright IBM Corp. 2000, 2001.
* All Rights Reserved.
*/
/**
* An expression is a snippet of code that can be evaluated
* to produce a value. When and how an experssion is evaluated
* is implementation specific. The context/binding required to
* evaluate an expression varies by debug model, and by
* user intent. Furthermore, an expression may need to be evaluated
* at a specific location in a program (for example, at a
* breakpoint/line where certain variables referenced in the
* expression are visible/allocated). A user may want to
* evaluate an expression once to produce a value than can
* be inspected iteratively, or they may wish to evaluate an
* expression iteratively producing new values each time
* (i.e. as in a watch list).
* <p>
* Clients are intended to implement this interface.
* </p>
* @since 2.0
*/
public interface IExpression extends IDebugElement {
/**
* Returns this expression's snippet of code.
*
* @return the expression
*/
public abstract String getExpressionText();
/**
* Returns the current value of this expression or
* <code>null</code> if this expression does not
* currently have a value.
*
* @return value or <code>null</code>
*/
public abstract IValue getValue();
/**
* Returns the debug target this expression is associated
* with, or <code>null</code> if this expression is not
* associated with a debug target.
*
* @return debug target or <code>null</code>
* @see IDebugElement#getDebugTarget()
*/
public abstract IDebugTarget getDebugTarget();
/**
* Notifies this expression that it has been removed
* from the expression manager. Any required clean up
* is be performed such that this expression can be
* garbage collected.
*/
public abstract void dispose();
}
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