// ReportViewer.java
package org.eclipse.stem.ui.reports.views;

/*******************************************************************************
 * Copyright (c) 2007 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
 *******************************************************************************/

import java.io.File;
import java.io.IOException;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;

import org.eclipse.core.runtime.IPath;
import org.eclipse.emf.common.util.URI;
import org.eclipse.jface.dialogs.DialogSettings;
import org.eclipse.jface.dialogs.IDialogSettings;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.stem.core.common.Identifiable;
import org.eclipse.stem.core.graph.Graph;
import org.eclipse.stem.core.graph.Node;
import org.eclipse.stem.jobs.simulation.ISimulation;
import org.eclipse.stem.jobs.simulation.ISimulationManagerListener;
import org.eclipse.stem.jobs.simulation.Simulation;
import org.eclipse.stem.jobs.simulation.SimulationManager;
import org.eclipse.stem.jobs.simulation.SimulationManagerEvent;
import org.eclipse.stem.ui.reports.Activator;
import org.eclipse.stem.ui.views.geographic.map.MapControl;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.events.DisposeListener;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;

/**
 * This class presents "views" of the running simulations.
 */
public class ReportViewer extends Viewer implements ISelectionChangedListener,
		ISimulationManagerListener {

	/**
	 * This is the collection of {@link Identifiable}s to display (
	 * {@link Node}s for now)
	 * {@link org.eclipse.stem.jobs.simulation.Simulation}s that should be
	 * displayed.
	 */
	private final Set<Identifiable> identifiablesToDisplay = new LinkedHashSet<Identifiable>();

	/**
	 * This is the {@link SimulationManager} that is the input to the viewer. It
	 * maintains a collection of active
	 * {@link org.eclipse.stem.jobs.simulation.Simulation}s in the system.
	 * This viewer listens to it to discover when new
	 * {@link org.eclipse.stem.jobs.simulation.Simulation}s are created and
	 * old ones disappear.
	 * 
	 * @see #simulationsChanged(SimulationManagerEvent)
	 */
	private SimulationManager simulationManager;

	/**
	 * The {@link Identifiable} that was most recently selected by a user
	 * clicking on one of the
	 * {@link org.eclipse.stem.ui.views.geographic.map.MapControl}s, or
	 * <code>null</code> if none has been selected.
	 */
	private ISelection selection = null;

	/**
	 * This is the top-level control of the viewer. It contains the
	 * {@link org.eclipse.stem.ui.views.geographic.map.MapControl}s that
	 * display the current state of the
	 * {@link org.eclipse.stem.jobs.simulation.Simulation}s.
	 */
	final Composite composite;

	/**
	 * the user's preferences are stored in {@link DialogSettings}
	 */
	private DialogSettings masterSettings = null;

	/**
	 * Set of preferred Locations to monitor read from the
	 * {@link DialogSettings}
	 */
	private final Set<String> monitorSet = new HashSet<String>();

	/**
	 * root key element for the {@link DialogSettings} xml file
	 */
	private static final String ROOT_KEY = "root";

	/**
	 * Constants for saving ReportViewPreferences
	 */
	public static final String REPORTVIEWPREFERENCES_FILENAME = "Preferences.txt";

	/**
	 * TODO JFK
	 */
	public static final String LOCATION_PREFERENCE_KEY = "location.ids";

	// get the path
	private static final IPath PATH = Activator.getDefault().getStateLocation();

	/**
	 * This factory is used to create instances of {@link ReportControl} in the
	 * method {@link #populateView()}
	 */
	private final ReportControlFactory rcf;

	/**
	 * @param parent
	 *            the SWT parent of the control that makes up the viewer
	 * @param rcf
	 *            the factory that creates instance of {@link ReportControl}
	 */
	public ReportViewer(final Composite parent, final ReportControlFactory rcf) {

		composite = new Composite(parent, SWT.NONE);
		final FillLayout compositeLayout = new FillLayout(SWT.HORIZONTAL);
		composite.setLayout(compositeLayout);

		// Remember the factory that we'll use to create instances of
		// ReportControl
		this.rcf = rcf;
		refresh();
		composite.pack();

	} // ReportViewer

	/**
	 * @see org.eclipse.jface.viewers.Viewer#getControl()
	 */
	@Override
	public Control getControl() {
		return composite;
	} // getControl

	/**
	 * @see org.eclipse.jface.viewers.Viewer#getSelection()
	 */
	@Override
	public ISelection getSelection() {
		return selection;
	}

	/**
	 * @see org.eclipse.jface.viewers.Viewer#refresh()
	 */
	@Override
	public void refresh() {
		if (simulationManager != null) {
			// Yes
			List<ISimulation> allSimulations = null;
			List<ISimulation> activeSimulations = simulationManager.getActiveSimulations();
			if((activeSimulations!=null)&&(activeSimulations.size()>=1)) {
				for (int i=0 ; i < activeSimulations.size(); i ++) {
					ISimulation sim = activeSimulations.get(i);
					updatePreferenceState(sim);
				}
			}
			
			allSimulations = simulationManager.getActiveSimulations();
			addToDisplayedIdentifiableSet(allSimulations);

			identifiablesToDisplay.clear();
			identifiablesToDisplay.addAll(getIdentifiablesInSimulation(allSimulations));
		} // if
		// calling with null means this is a new identifiable for an 
		// active simulation but not a new simulation
		if(rcf.getFactoryType().equals(ReportControlFactory.IDENTIFABLE_TYPE)){
			populateView();
		} else {
			populateView(null);
		}
		
	} // refresh

	/**
	 * 
	 * @param ident
	 */
	public void addMonitor(final Identifiable ident) {

		// this fixes a bug where clicks in the
		// Designer perspective were creating new ReportViews
		if (!(ident instanceof Node)) {
			return;
		}
		identifiablesToDisplay.add(ident);
		populateView();
		// preference state has changed
		savePreferenceState();
		// add  to monitor set
		monitorSet.add(ident.getURI().toString());
	} // addMonitor

	/**
	 * @see org.eclipse.jface.viewers.Viewer#getInput()
	 */
	@Override
	public Object getInput() {
		return simulationManager;
	}

	/**
	 * @see org.eclipse.jface.viewers.Viewer#setInput(java.lang.Object)
	 */
	@Override
	public void setInput(final Object input) {
		final Object oldInput = simulationManager;
		simulationManager = (SimulationManager) input;
		inputChanged(input, oldInput);
	} // setInput

	/**
	 * @see org.eclipse.jface.viewers.Viewer#inputChanged(java.lang.Object,
	 *      java.lang.Object)
	 */
	@Override
	protected void inputChanged(final Object input, final Object oldInput) {
		// Is there already a simulation manager?
		if (oldInput != null) {
			// Yes
			((SimulationManager) oldInput).removeListener(this);
		} // if

		// Register with the SimulationManager to listen for changes in the set
		// of active Simulations.
		// Got input?
		if (input != null) {
			// Yes
			((SimulationManager) input).addSimulationManagerListener(this);
		} // if

		// Update the viewer with the contents of the new input source
		refresh();
	} // inputChanged

	/**
	 * @see org.eclipse.jface.viewers.Viewer#setSelection(org.eclipse.jface.viewers.ISelection,
	 *      boolean)
	 */
	@Override
	public void setSelection(final ISelection selection,
			@SuppressWarnings("unused") final boolean reveal) {
		this.selection = selection;
	}

	/**
	 * @see org.eclipse.jface.viewers.ISelectionChangedListener#selectionChanged(org.eclipse.jface.viewers.SelectionChangedEvent)
	 */
	public void selectionChanged(final SelectionChangedEvent event) {

		// Did the event come from a ReportControl?
		if (event.getSelectionProvider() instanceof ReportControl) {
			// Yes
			// Just pass it along
			selection = event.getSelection();
			fireSelectionChanged(event);
		} // if
	} // selectionChanged

	/**
	 * @see org.eclipse.stem.jobs.simulation.ISimulationManagerListener#simulationsChanged(org.eclipse.stem.jobs.simulation.SimulationManagerEvent)
	 */
	public void simulationsChanged(final SimulationManagerEvent event) {
		
		// Init the preference
		removeFromDisplayedSimulationSet(Arrays.asList(event.getSimulationsRemoved()));
		List<ISimulation> newSimulationList = Arrays.asList(event.getSimulationsAdded());
		if((newSimulationList!=null)&&(newSimulationList.size() >=1)) {
			for (int i = 0;  i < newSimulationList.size(); i ++) {
				ISimulation sim = newSimulationList.get(i);
				updatePreferenceState(sim);
				addToDisplayedIdentifiableSet(sim);
				populateView(); // the time series charts
				// new simulation !!
				populateView(sim);// the aggregate charts
			}
		}
		
	} // simulationsChanged

	/**
	 * @param simulations
	 *            the {@link org.eclipse.stem.jobs.simulation.Simulation}s
	 *            to add to the set being displayed.
	 */
	private void addToDisplayedIdentifiableSet(
			final List<ISimulation> simulations) {
		// Any simulations to add?
		if (!simulations.isEmpty()) {
			// Yes
			identifiablesToDisplay
					.addAll(getIdentifiablesInSimulation(simulations));
		} // if any simulations
	} // addToDisplayedSimulationSet

	/**
	 * @param simulations
	 *            the {@link org.eclipse.stem.jobs.simulation.Simulation}s
	 *            to add to the set being displayed.
	 */
	private void addToDisplayedIdentifiableSet(ISimulation sim) {		
			identifiablesToDisplay.addAll(getIdentifiablesInSimulation(sim));
	} // addToDisplayedSimulationSet

	
	/**
	 * @param simulations
	 *            the {@link org.eclipse.stem.jobs.simulation.Simulation}s
	 *            to remove from the set being displayed.
	 */
	private void removeFromDisplayedSimulationSet(
			final List<ISimulation> simulations) {
		// Any simulations to remove?
		if (!simulations.isEmpty()) {
			// Yes
			final Set<Identifiable> defunctIdentifiables = getIdentifiablesInSimulation(simulations);
			identifiablesToDisplay.removeAll(defunctIdentifiables);
			cleanup(defunctIdentifiables);
		} // if
	} // removeFromDisplayedSimulationSet

	/**
	 * cleans up old displays
	 * 
	 * @param defunctIdentifiables
	 */
	private void cleanup(final Set<Identifiable> defunctIdentifiables) {
		if (defunctIdentifiables != null) {
			final Iterator<Identifiable> iter = defunctIdentifiables.iterator();
			while ((iter != null) && (iter.hasNext())) {
				final Identifiable ident = iter.next();
				monitorSet.remove(ident.getURI().toString());
			} // while

			if(!composite.isDisposed()) {
				final Control[] allControls = composite.getChildren();
				
				for (final Control element : allControls) {
					final ReportControl reportControl = (ReportControl) element;
					try {
						final Identifiable testIdentifiable = reportControl
								.getIdentifiable();
						if ((testIdentifiable == null)
								|| (!identifiablesToDisplay
										.contains(testIdentifiable))) {
							// dispose if we know it is defunct
							reportControl.remove();
						} // if
					} catch (org.eclipse.swt.SWTException swte) {
						// if Widget is already disposed just do nothing
						// Activator.logInformation("swte: "+swte.getMessage());
					}
	
				} // for each ReportControl
			}
		}// if set not null
	}// cleanup

	protected void removeIdentifiable(final Identifiable ident) {
		// Any simulations to remove?
		if (ident != null) {
			// Yes
			identifiablesToDisplay.remove(ident);

			// preference state has changed
			savePreferenceState();

		} // if
	} // removeFromDisplayedSimulationSet

	/**
	 * Create and dispose of {@link MapControl}s as necessary to display the
	 * selected {@link Simulation}s.
	 */
	private void populateView(ISimulation sim) {
		// THE Aggregate control is a special case. All others handled by the other populateView method
		if( ! (this.rcf.getFactoryType().equals(ReportControlFactory.SIMULATION_TYPE))) return;
		boolean foundControl = false;
		// problem here when we start up
		// Are we done?
		if (composite.isDisposed()) {
			// Yes
			return;
		} // if

		selection = null;
		
		List<ISimulation> activeSimList = SimulationManager.getManager().getActiveSimulations();
		Set<ISimulation> activeSimSet = new HashSet<ISimulation>();
		activeSimSet.addAll(activeSimList);

		if(sim != null) {
			// Go through the current set of Controls looking for ones that
			// we can reassign
			final Control[] controls = composite.getChildren();
			for (final Control element : controls) {
				// Does this ReportControl have a simulation that is still valid
				// to display?
				final ReportControl reportControl = (ReportControl) element;
				// THE Aggregate control is a special case
				if(reportControl.getControlType().equals(ReportControlFactory.SIMULATION_TYPE)) {
					if(reportControl.simulation==null) {
						reportControl.setSimulation(sim);
						reportControl.redraw();
						foundControl = true;
					}
				} 
			} // for each MapControl

			// At this point we still could have map controls with invalid
			// identifiables, let's get rid of them
			for (final Control element : controls) {
				final ReportControl reportControl = (ReportControl) element;
				
				if(reportControl.getControlType().equals(ReportControlFactory.SIMULATION_TYPE)) {
					// Does this MapControl have a simulation that is still valid to
					// display?
					// THE Aggregate control is a special case
					if(reportControl.simulation!=null) {
						if(!activeSimSet.contains(reportControl.simulation)) {
							reportControl.removeSelectionChangedListener(this);
							reportControl.dispose();
						}
					}	
				} 
			}// for each MapControl
			
			if(!foundControl) {
				// We need a new control for this simulation
				final ReportControl reportControl = rcf.create(composite);
				reportControl.addSelectionChangedListener(this);
				reportControl.setSimulation(sim);
				
				// must listen - when the children go away we no longer want to
				// monitor them

				/**
				 * called when a remove widget is pressed
				 */
				reportControl.addIRemoveListener(new IRemoveListener() {
					/**
					 * @see org.eclipse.swt.events.DisposeListener#widgetDisposed(org.eclipse.swt.events.DisposeEvent)
					 */
					public void identifiableRemoved(final Identifiable ident) {
						removeIdentifiable(ident);
					}
				});
				reportControl.addDisposeListener(new DisposeListener() {
					/**
					 * @see org.eclipse.swt.events.DisposeListener#widgetDisposed(org.eclipse.swt.events.DisposeEvent)
					 */
					public void widgetDisposed(
							@SuppressWarnings("unused") final DisposeEvent e) {
						composite.layout(true, true);
						composite.redraw();
					}
				});
			} // not found control
		} // sim not null
		else {
			// If there are no simulations to display, we just put up a "blank"
			// ReportControl
			if (composite.getChildren().length == 0) {
				// Yes
				final ReportControl reportControl = rcf.create(composite);
				reportControl.addSelectionChangedListener(this);

				/**
				 * called when a remove widget is pressed
				 */
				reportControl.addIRemoveListener(new IRemoveListener() {
					/**
					 * @see org.eclipse.swt.events.DisposeListener#widgetDisposed(org.eclipse.swt.events.DisposeEvent)
					 */
					public void identifiableRemoved(final Identifiable ident) {
						removeIdentifiable(ident);
					}
				});
				reportControl.addDisposeListener(new DisposeListener() {
					/**
					 * @see org.eclipse.swt.events.DisposeListener#widgetDisposed(org.eclipse.swt.events.DisposeEvent)
					 */
					public void widgetDisposed(
							@SuppressWarnings("unused") final DisposeEvent e) {
						composite.layout(true, true);
						composite.redraw();
					}
				});
			} // if
		}
		
		
		composite.layout(true, true);
		composite.redraw();
	} // populateView(ISimulation)
	
	
	/**
	 * Create and dispose of {@link MapControl}s as necessary to display the
	 * selected {@link Simulation}s.
	 */
	private void populateView() {
		// THE Aggregate control is a special case handled by the other populateView method
		
		if(this.rcf.getFactoryType().equals(ReportControlFactory.SIMULATION_TYPE) ) return;
		
		// problem here when we start up
		// Are we done?
		if (composite.isDisposed()) {
			// Yes
			return;
		} // if

		selection = null;
		
		// Find the Simulations that are not currently being displayed and put
		// them into the Set undisplayedSimulations.
		final Set<Identifiable> undisplayedIdentifiables = new HashSet<Identifiable>();
		for (final Identifiable node : identifiablesToDisplay) {
			// Is this one associated with a ReportControl already?
			if (!isDisplayed(node)) {
				// No
				undisplayedIdentifiables.add(node);
			} // if not displayed
		} // for each ISimulation

		// Go through the current set of Controls looking for ones that
		// we can reassign
		final Control[] controls = composite.getChildren();
		for (final Control element : controls) {
			// Does this ReportControl have a simulation that is still valid
			// to display?
			final ReportControl reportControl = (ReportControl) element;
			if(reportControl.getControlType().equals(ReportControlFactory.IDENTIFABLE_TYPE)) {
				// all other controls
				if (!undisplayedIdentifiables.isEmpty()
						&& !identifiablesToDisplay.contains(reportControl
								.getIdentifiable())) {
					// No
					// Reassign it to one that is valid
					final Identifiable ident = (Identifiable) undisplayedIdentifiables
							.toArray()[0];
					reportControl.setIdentifiable(ident);
					undisplayedIdentifiables.remove(ident);
				}
			}
		} // for each MapControl


		// At this point we still could have map controls with invalid
		// identifiables, let's get rid of them
		for (final Control element : controls) {
			final ReportControl reportControl = (ReportControl) element;
			if(reportControl.getControlType().equals(ReportControlFactory.IDENTIFABLE_TYPE)) {
				// Does this MapControl have a identifiable that is still valid to
				// display?
				final Identifiable ident = reportControl.getIdentifiable();
				if (ident != null && !identifiablesToDisplay.contains(ident)) {
					// No
					reportControl.removeSelectionChangedListener(this);
					reportControl.dispose();
				}
			}
		}// for each MapControl
		
		// If there're any Nodes not assigned to a ReportControl,
		// let's take care of that now.
	
		for (final Identifiable ident : undisplayedIdentifiables) {
			if(ident!= null) {
				final ReportControl reportControl = rcf.create(composite);
				reportControl.addSelectionChangedListener(this);
				reportControl.setIdentifiable(ident);
				// must listen - when the children go away we no longer want to
				// monitor them

				/**
				 * called when a remove widget is pressed
				 */
				reportControl.addIRemoveListener(new IRemoveListener() {
					/**
					 * @see org.eclipse.swt.events.DisposeListener#widgetDisposed(org.eclipse.swt.events.DisposeEvent)
					 */
					public void identifiableRemoved(final Identifiable ident) {
						removeIdentifiable(ident);
					}
				});
				reportControl.addDisposeListener(new DisposeListener() {
					/**
					 * @see org.eclipse.swt.events.DisposeListener#widgetDisposed(org.eclipse.swt.events.DisposeEvent)
					 */
					public void widgetDisposed(
							@SuppressWarnings("unused") final DisposeEvent e) {
						composite.layout(true, true);
						composite.redraw();
					}
				});
			}// not null
		} // for each Identifiable

		// If there are no simulations to display, we just put up a "blank"
		// ReportControl
		if (composite.getChildren().length == 0) {
			// Yes
			final ReportControl reportControl = rcf.create(composite);
			reportControl.addSelectionChangedListener(this);

			/**
			 * called when a remove widget is pressed
			 */
			reportControl.addIRemoveListener(new IRemoveListener() {
				/**
				 * @see org.eclipse.swt.events.DisposeListener#widgetDisposed(org.eclipse.swt.events.DisposeEvent)
				 */
				public void identifiableRemoved(final Identifiable ident) {
					removeIdentifiable(ident);
				}
			});
			reportControl.addDisposeListener(new DisposeListener() {
				/**
				 * @see org.eclipse.swt.events.DisposeListener#widgetDisposed(org.eclipse.swt.events.DisposeEvent)
				 */
				public void widgetDisposed(
						@SuppressWarnings("unused") final DisposeEvent e) {
					composite.layout(true, true);
					composite.redraw();
				}
			});

		} // if
		composite.layout(true, true);
		composite.redraw();
		
	} // populateView()
	
	
	/**
	 * 
	 * @param simulations
	 * @return
	 */
	private Set<Identifiable> getIdentifiablesInSimulation(
			final List<ISimulation> simulationList) {
		final Set<Identifiable> retVal = new LinkedHashSet<Identifiable>();
		for (int i = 0; i < simulationList.size(); i++) {
			final ISimulation simulation = simulationList.get(i);
			/*
			 * The default monitor locations always contains the works
			 * (URIsuffix = ZZZ, or MonitorPreferences.DEFAULT_LOCATION_ID
			 * However, if a scenario contains only one country then the ZZZ
			 * nodes does not exist and the top level node will be the country
			 * code. So here we check that the ZZZ node exists. If it does not
			 * exist we look for three letter country code(s) and add that
			 * (those - but there should be only one) to the list.
			 */
			final Graph graph = simulation.getScenario().getCanonicalGraph();
			/*
			 * this code was used to avoid a bug that should now be fixed
			 * 
			 * if (graph == null) { Activator.logInformation("graph is null"); // try
			 * several times for (int ii = 0 ; ii < 50; ii ++) { try {
			 * Thread.sleep(100); } catch (Exception e) { // nothing } graph =
			 * simulation.getScenario().getCanonicalGraph(); if (graph != null)
			 * break; }// for 10 tries } //if graph null
			 */

			if (graph != null) {
				// final EMap<URI, Node> allNodes = graph.getNodes();
				// final Set<URI> allGraphURIs = allNodes.keySet();
				// final URI defaultURI = MonitorPreferences.getDefaultURI();

				/*
				 * We won't use the following code. It creates too many
				 * countries when scenario includes an entire continent
				 *  // if the world URI=..ZZZ does NOT exist if
				 * (!allGraphURIs.contains(defaultURI)) { final Iterator<URI>
				 * iter = allGraphURIs.iterator(); while ((iter != null) &&
				 * (iter.hasNext())) { final String uriString =
				 * (iter.next()).toString(); final String suf =
				 * MonitorPreferences .getURIsuffix(uriString); if
				 * ((suf.length() == 3) && (suf.indexOf("-") == -1)) { // add
				 * the node monitorSet.add(uriString); } // if admin0=country
				 * level 3 letter uri } // all uri's in Graph } // if world uri
				 * does not exist
				 */

				final Iterator<String> iter = monitorSet.iterator();
				while ((iter != null) && (iter.hasNext())) {
					final String key = iter.next();
					Identifiable node = null;
					URI locURI = null;
					try {
						locURI = URI.createURI(key);
						node = graph.getNode(locURI);
						if (node != null) {
							retVal.add(node);
						}
					} catch (final Exception e) {
						org.eclipse.stem.ui.reports.Activator.logError(
								"ReportViewer.getIdentifiablesInSimulation() Error setting Identifiable to "
										+ key + " ", e);
					}
				}// while locations to monitor

			}// graph not null

		} // for all simulations

		return retVal;
	}
	
	/**
	 * 
	 * @param simulation one simulation
	 * @return
	 */
	private Set<Identifiable> getIdentifiablesInSimulation(ISimulation simulation) {
		final Set<Identifiable> retVal = new LinkedHashSet<Identifiable>();
			/*
			 * The default monitor locations always contains the works
			 * (URIsuffix = ZZZ, or MonitorPreferences.DEFAULT_LOCATION_ID
			 * However, if a scenario contains only one country then the ZZZ
			 * nodes does not exist and the top level node will be the country
			 * code. So here we check that the ZZZ node exists. If it does not
			 * exist we look for three letter country code(s) and add that
			 * (those - but there should be only one) to the list.
			 */
			final Graph graph = simulation.getScenario().getCanonicalGraph();
			/*
			 * this code was used to avoid a bug that should now be fixed
			 * 
			 * if (graph == null) { Activator.logInformation("graph is null"); // try
			 * several times for (int ii = 0 ; ii < 50; ii ++) { try {
			 * Thread.sleep(100); } catch (Exception e) { // nothing } graph =
			 * simulation.getScenario().getCanonicalGraph(); if (graph != null)
			 * break; }// for 10 tries } //if graph null
			 */

			if (graph != null) {
				// final EMap<URI, Node> allNodes = graph.getNodes();
				// final Set<URI> allGraphURIs = allNodes.keySet();
				// final URI defaultURI = MonitorPreferences.getDefaultURI();

				/*
				 * We won't use the following code. It creates too many
				 * countries when scenario includes an entire continent
				 *  // if the world URI=..ZZZ does NOT exist if
				 * (!allGraphURIs.contains(defaultURI)) { final Iterator<URI>
				 * iter = allGraphURIs.iterator(); while ((iter != null) &&
				 * (iter.hasNext())) { final String uriString =
				 * (iter.next()).toString(); final String suf =
				 * MonitorPreferences .getURIsuffix(uriString); if
				 * ((suf.length() == 3) && (suf.indexOf("-") == -1)) { // add
				 * the node monitorSet.add(uriString); } // if admin0=country
				 * level 3 letter uri } // all uri's in Graph } // if world uri
				 * does not exist
				 */

				final Iterator<String> iter = monitorSet.iterator();
				while ((iter != null) && (iter.hasNext())) {
					final String key = iter.next();
					Identifiable node = null;
					URI locURI = null;
					try {
						locURI = URI.createURI(key);
						node = graph.getNode(locURI);
						if (node != null) {
							retVal.add(node);
						}
					} catch (final Exception e) {
						org.eclipse.stem.ui.reports.Activator.logError(
								"ReportViewer.getIdentifiablesInSimulation() Error setting Identifiable to "
										+ key + " ", e);
					}
				}// while locations to monitor
			}// graph not null
		return retVal;
	}

	/**
	 * @param simulation
	 * @return
	 */
	private boolean isDisplayed(final Identifiable identifiable) {
		boolean retValue = false;
		final Control[] allControls = composite.getChildren();
		for (final Control element : allControls) {
			final ReportControl reportControl = (ReportControl) element;
			final Identifiable testIdentifiable = reportControl
					.getIdentifiable();
			if (testIdentifiable != null
					&& testIdentifiable.equals(identifiable)) {
				retValue = true;
				break;
			} // if
		} // for each ReportControl
		return retValue;
	} // isDisplayed

	/**
	 * save the state of preferred locations to monitor
	 */
	private void savePreferenceState() {

		// we need to write preferences by active simulation
		List<ISimulation> allSimulations = null;
		final Set<String> nodesInSimulation = new HashSet<String>();
		if (simulationManager != null) {
			allSimulations = simulationManager.getActiveSimulations();
		}
		if ((allSimulations != null) && (allSimulations.size() >= 1)) {
			for (int i = 0; i < allSimulations.size(); i++) {
				nodesInSimulation.clear();
				final ISimulation sim = allSimulations.get(i);
				final String scenarioName = sim.getScenario().getURI()
						.toString();

				// recreate the subsection for this scenario using the locations
				// now being monitored
				final IDialogSettings section = new DialogSettings(scenarioName);

				final Graph graph = sim.getScenario().getCanonicalGraph();
				final Iterator<Identifiable> iter = identifiablesToDisplay
						.iterator();
				while ((iter != null) && (iter.hasNext())) {
					final Identifiable ident = iter.next();
					if (ident != null) {
						// is this node in this simulation?
						final Identifiable node = graph.getNode(ident.getURI());
						if (node != null) {
							final String id = ident.getURI().toString();
							if (id != null) {
								nodesInSimulation.add(id);
							}
						} // if node in simulation
					}

				}// all currently displayed nodes

				final String[] newPrefs = new String[nodesInSimulation.size()];
				final Iterator<String> iter2 = nodesInSimulation.iterator();
				int icount = 0;
				while ((iter2 != null) && (iter2.hasNext())) {
					newPrefs[icount] = iter2.next();
					icount++;
				}

				section.put(LOCATION_PREFERENCE_KEY, newPrefs);
				if (masterSettings == null) {
					masterSettings = new DialogSettings(ROOT_KEY);
				}
				masterSettings.addSection(section);
				try {
					masterSettings.save(getPrefFileName());
				} catch (final IOException ioe) {
					org.eclipse.stem.ui.reports.Activator
							.logError("exception writing file ["
									+ ioe.getMessage() + "]", ioe);
				}

			} // for all simulations
		}// if not null

	}// savePreferenceState

	/**
	 * This method uses {@link DialogSettings} to load and update the monitorSet
	 * which contains (filters) the valid list of preferred {@link Identifiable}s
	 * to display from the the state of the previously saved preference state.
	 * for {@link Simulation}s that are running
	 * 
	 * @param runningSimulations
	 */
	private void updatePreferenceState(ISimulation sim) {
		// what type of viewer? TimeSeries, PhaseSpace etc
		if (masterSettings == null) {
			readMasterSettingsFromFile();
		}
		final String scenarioName = sim.getScenario().getURI().toString();
		IDialogSettings section = masterSettings.getSection(scenarioName);
		if (section == null) {
			section = new DialogSettings(scenarioName);
			masterSettings.addSection(section);
		}
		// now add the preferences to the monitorSet
		final String[] allIDs = section.getArray(LOCATION_PREFERENCE_KEY);
		if (allIDs != null) {
			for (final String element : allIDs) {
				monitorSet.add(element);
			}// for allIDs

		}// not null
	}// updatePreferenceState

	/**
	 * get the {@link DialogSettings} from the file
	 */
	public void readMasterSettingsFromFile() {
		masterSettings = new DialogSettings(ROOT_KEY);

		final String filename = getPrefFileName();
		final File f = new File(filename);
		if (f.exists()) {
			try {
				masterSettings.load(filename);
			} catch (final IOException ioe) {
				org.eclipse.stem.ui.reports.Activator.logError(
						"exception loading file [" + ioe.getMessage() + "]",
						ioe);
			}
		} else {
			// else create it
			try {
				masterSettings.save(filename);
			} catch (final IOException ioe) {
				org.eclipse.stem.ui.reports.Activator.logError(
						"exception creating file [" + ioe.getMessage() + "]",
						ioe);
			}
		} // else if f !exists
	}// read master setttings

	/**
	 * gets the preferences file name
	 * 
	 * @return file name containing the users preferences
	 */
	public String getPrefFileName() {
		final String controlCategory = rcf.getUniqueControlName();
		// Get the right preference file
		final String filename = PATH.append(
				controlCategory + "_" + REPORTVIEWPREFERENCES_FILENAME)
				.toOSString();
		return filename;
	}

} // ReportViewer