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/*******************************************************************************
* Copyright (c) 2006, 2009 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.debug.core.commands;
/**
* Handles a command for a debugger. Specific command handlers extend this interface.
* <p>
* The debug platform provides actions for common debug commands that operate against
* these handler interfaces. For example, the platform provides a terminate action that
* operates on the active debug context (selected element in the debug view). The action
* delegates to the active context's {@link ITerminateHandler} implementation to update
* its enabled state and execute the command. Debug model elements may implement supported
* command handler interfaces directly or provide them as adapters. The debug platform
* provides implementations of handlers for standard debug models.
* </p>
* @see org.eclipse.core.runtime.IAdaptable
* @see IDisconnectHandler
* @see IDropToFrameHandler
* @see IResumeHandler
* @see IStepFiltersHandler
* @see IStepIntoHandler
* @see IStepOverHandler
* @see IStepReturnHandler
* @see ISuspendHandler
* @see ITerminateHandler
* @since 3.3
*/
public interface IDebugCommandHandler {
/**
* Determines whether this handler can execute on the elements specified
* in the given request by reporting enabled state to the request.
* <p>
* Implementations must be non-blocking and may respond asynchronously to the
* given request. Errors can reported by setting an appropriate status
* on the given request. A request can be canceled by this handler or caller.
* A <code>null</code> status is equivalent to an OK status.
* When a request succeeds, fails, or is canceled, implementations must call
* <code>done()</code> on the given request.
* </p>
* <p>
* Clients are expected to poll the request (using <code>isCanceled</code>)
* periodically and abort at their earliest convenience calling <code>done()</code>
* on the request.
* </p>
* @param request specifies elements to operate on and collects enabled state
*/
void canExecute(IEnabledStateRequest request);
/**
* Executes this command on the elements specified in the given request
* reporting status to the given request and returns whether this handler should
* remain enabled while the command is executing.
* <p>
* Implementations must be non-blocking and may respond asynchronously to the
* given request. Errors can reported by setting an appropriate status
* on the given request. A request can be canceled by this handler or the caller.
* A <code>null</code> status is equivalent to an OK status. When a request is
* complete, has encountered an error, or canceled, implementations must call
* <code>done()</code> on the given collector.
* </p>
* <p>
* Handlers are expected to poll the request (using <code>isCanceled</code>)
* periodically and abort at their earliest convenience calling <code>done()</code>
* on the request.
* </p>
* @param request specifies elements to operate on and collects execution status
* @return whether this handler remains enabled while command is executing
*/
boolean execute(IDebugCommandRequest request);
}
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