/**

* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description: 

*

*/

package org.eclipse.cdt.dsf.debug.ui;

import org.eclipse.cdt.debug.ui.editors.AbstractDebugTextHover;

import org.eclipse.cdt.dsf.concurrent.DataRequestMonitor;

import org.eclipse.cdt.dsf.concurrent.Query;

import org.eclipse.cdt.dsf.debug.service.IExpressions;

import org.eclipse.cdt.dsf.debug.service.IFormattedValues;

import org.eclipse.cdt.dsf.debug.service.IExpressions.IExpressionDMContext;

import org.eclipse.cdt.dsf.debug.service.IFormattedValues.FormattedValueDMContext;

import org.eclipse.cdt.dsf.debug.service.IFormattedValues.FormattedValueDMData;

import org.eclipse.cdt.dsf.debug.service.IStack.IFrameDMContext;

import org.eclipse.cdt.dsf.internal.ui.DsfUIPlugin;

import org.eclipse.cdt.dsf.service.DsfServicesTracker;

import org.eclipse.cdt.dsf.service.DsfSession;

import org.eclipse.core.runtime.IAdaptable;

import org.eclipse.debug.core.model.IDebugModelProvider;

/**

 * An implementation of AbstractDebugTextHover using DSF services.

 * 

 * @since 2.1

 */

abstract public class AbstractDsfDebugTextHover extends AbstractDebugTextHover {

    /**

     * Returns the debug model ID of that this debug text hover is to be used for.

     */

    abstract protected String getModelId();

	private static class GetExpressionValueQuery extends Query<FormattedValueDMData> {

    	private final IFrameDMContext frame;

    	private final String expression;

		private DsfServicesTracker dsfServicesTracker;

        public GetExpressionValueQuery(IFrameDMContext frame, String expression, DsfServicesTracker dsfServicesTracker) {

            this.frame = frame;

			this.expression = expression;

			this.dsfServicesTracker = dsfServicesTracker;

        }

        @Override

        protected void execute(final DataRequestMonitor<FormattedValueDMData> rm) {

            DsfSession session = DsfSession.getSession(frame.getSessionId());

			IExpressions expressions = dsfServicesTracker.getService(IExpressions.class);

    		IExpressionDMContext expressionDMC = expressions.createExpression(frame, expression);

    		FormattedValueDMContext formattedValueContext = expressions.getFormattedValueContext(expressionDMC, IFormattedValues.NATURAL_FORMAT);

        	expressions.getFormattedExpressionValue(formattedValueContext,

        			new DataRequestMonitor<FormattedValueDMData>(session.getExecutor(), rm) {

                @Override

                protected void handleSuccess() {

                    rm.setData(getData());

                    rm.done();

                }

                @Override

        		protected void handleFailure() {

        			rm.done();

        		}

            });

        }

    }

	protected IFrameDMContext getFrame() {

	    IAdaptable adaptable = getSelectionAdaptable();

	    if (adaptable != null) {

	        return (IFrameDMContext) adaptable.getAdapter(IFrameDMContext.class);

		}

		return null;

	}

	@Override

	protected boolean canEvaluate() {

	    if (getFrame() == null) {

	        return false;

	    }

		IAdaptable adaptable = getSelectionAdaptable();

		if (adaptable != null) {

		    IDebugModelProvider modelProvider = (IDebugModelProvider)adaptable.getAdapter(IDebugModelProvider.class);

		    if (modelProvider != null) {

		        String[] models = modelProvider.getModelIdentifiers();

		        String myModel = getModelId();

		        for (int i = 0; i < models.length; i++) {

		            if (models[i].equals(myModel)) {

		                return true;

		            }

		        }

		    }

		}

		return false;

	}

	@Override

	protected String evaluateExpression(String expression) {

		IFrameDMContext frame = getFrame();

		String sessionId = frame.getSessionId();

		DsfServicesTracker dsfServicesTracker = new DsfServicesTracker(DsfUIPlugin.getBundleContext(), sessionId);

		try {

			GetExpressionValueQuery query = new GetExpressionValueQuery(frame, expression, dsfServicesTracker);

			DsfSession session = DsfSession.getSession(sessionId);

	        session.getExecutor().execute(query);

	        try {

	        	FormattedValueDMData data = query.get();

	        	if (data != null)

	        		return data.getFormattedValue();

	        } catch (Exception e) {

	        }

		} finally {

			dsfServicesTracker.dispose();

		}

        return null;

	}

}