org.eclipse.modisco.infra.discovery.ui/src/org/eclipse/modisco/infra/discovery/ui/internal/views/DiscoverersView.java - modisco/org.eclipse.modisco - Git at Google

 /*******************************************************************************
  * Copyright (c) 2011 Mia-Software and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v2.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v20.html
  *
  * Contributors:
  *    Nicolas Bros (Mia-Software) - initial API and implementation
  *******************************************************************************/
 package org.eclipse.modisco.infra.discovery.ui.internal.views;

 import java.util.Collection;
 import java.util.List;

 import org.eclipse.jface.action.Action;
 import org.eclipse.jface.action.IAction;
 import org.eclipse.jface.resource.ImageDescriptor;
 import org.eclipse.jface.viewers.ColumnLabelProvider;
 import org.eclipse.jface.viewers.IContentProvider;
 import org.eclipse.jface.viewers.ISelectionChangedListener;
 import org.eclipse.jface.viewers.IStructuredContentProvider;
 import org.eclipse.jface.viewers.IStructuredSelection;
 import org.eclipse.jface.viewers.SelectionChangedEvent;
 import org.eclipse.jface.viewers.TableViewer;
 import org.eclipse.jface.viewers.Viewer;
 import org.eclipse.modisco.facet.common.ui.internal.controls.PersistableColumn;
 import org.eclipse.modisco.infra.discovery.catalog.DiscovererDescription;
 import org.eclipse.modisco.infra.discovery.catalog.DiscovererParameter;
 import org.eclipse.modisco.infra.discovery.core.IDiscoveryManager;
 import org.eclipse.modisco.infra.discovery.ui.Activator;
 import org.eclipse.modisco.infra.discovery.ui.Messages;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.custom.SashForm;
 import org.eclipse.swt.events.ControlAdapter;
 import org.eclipse.swt.events.ControlEvent;
 import org.eclipse.swt.graphics.Image;
 import org.eclipse.swt.layout.FillLayout;
 import org.eclipse.swt.layout.GridData;
 import org.eclipse.swt.layout.GridLayout;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.swt.widgets.Control;
 import org.eclipse.swt.widgets.Group;
 import org.eclipse.ui.IMemento;
 import org.eclipse.ui.IViewSite;
 import org.eclipse.ui.PartInitException;
 import org.eclipse.ui.part.ViewPart;

 /** An Eclipse view that displays a list of available discoverers. */
 public class DiscoverersView extends ViewPart {

 	private TableViewer discoverersViewer;
 	private TableViewer parametersViewer;
 	private Composite parentComposite;
 	private Composite mainComposite;

 	private static final String NAME_COLUMN = "DiscoverersView_NameColumn"; //$NON-NLS-1$
 	private static final String TYPE_COLUMN = "DiscoverersView_DescriptionColumn"; //$NON-NLS-1$
 	private static final String INPUT_TYPE_COLUMN = "DiscoverersView_InputTypeColumn"; //$NON-NLS-1$
 	private static final String DECLARING_BUNDLE_COLUMN = "DiscoverersView_DeclaringBundleColumn"; //$NON-NLS-1$
 	private static final String PARAM_NAME_COLUMN = "DiscoverersView_ParamName"; //$NON-NLS-1$
 	private static final String PARAM_TYPE_COLUMN = "DiscoverersView_ParamType"; //$NON-NLS-1$
 	private static final String PARAM_DIRECTION_COLUMN = "DiscoverersView_ParamDirection"; //$NON-NLS-1$
 	private static final String PARAM_REQUIRED_COLUMN = "DiscoverersView_ParamRequired"; //$NON-NLS-1$
 	private static final String PARAM_DESCRIPTION_COLUMN = "DiscoverersView_ParamDescription"; //$NON-NLS-1$
 	private static final int NAME_COLUMN_WIDTH = 200;
 	private static final int TYPE_COLUMN_WIDTH = 150;
 	private static final int DECLARING_BUNDLE_COLUMN_WIDTH = 400;
 	private static final int INPUT_TYPE_COLUMN_WIDTH = 150;
 	private static final int PARAM_NAME_COLUMN_WIDTH = 160;
 	private static final int PARAM_TYPE_COLUMN_WIDTH = 100;
 	private static final int PARAM_DIRECTION_COLUMN_WIDTH = 60;
 	private static final int PARAM_REQUIRED_COLUMN_WIDTH = 60;
 	private static final int PARAM_DESCRIPTION_COLUMN_WIDTH = 400;

 	private static final String SASH_POSITION1 = "sashPosition1"; //$NON-NLS-1$
 	private static final String SASH_POSITION2 = "sashPosition2"; //$NON-NLS-1$
 	private static final String LAYOUT_ORIENTATION = "orientation"; //$NON-NLS-1$

 	private enum LayoutStyle {
 		Horizontal, Vertical
 	}

 	/** static because we want to save it before closing Eclipse */
 	private static LayoutStyle layoutStyle = DiscoverersView.LayoutStyle.Vertical;
 	private PersistableColumn nameColumn;
 	private PersistableColumn implClassColumn;
 	private PersistableColumn paramNameColumn;
 	private PersistableColumn paramTypeColumn;
 	private PersistableColumn paramDirectionColumn;
 	private PersistableColumn paramRequiredColumn;
 	private PersistableColumn paramDescColumn;
 	private PersistableColumn inputTypeColumn;
 	private PersistableColumn declaringBundleColumn;
 	private SashForm sashForm;
 	private static Integer sashPosition1;
 	private static Integer sashPosition2;

 	protected static LayoutStyle getLayoutStyle() {
 		return DiscoverersView.layoutStyle;
 	}

 	protected void changeLayoutStyle(final LayoutStyle newLayoutStyle) {
 		if (newLayoutStyle == DiscoverersView.layoutStyle) {
 			return;
 		}
 		DiscoverersView.layoutStyle = newLayoutStyle;
 		createMainComposite();
 	}

 	@Override
 	public void createPartControl(final Composite parent) {
 		this.parentComposite = parent;
 		parent.setLayout(gridLayoutWithNoMargins());
 		createMainComposite();
 		// automatic layout:
 		// parent.addControlListener(new ControlAdapter() {
 		// @Override
 		// public void controlResized(final ControlEvent e) {
 		// Point size = parent.getSize();
 		// if (size.x > size.y) {
 		// changeLayoutStyle(LayoutStyle.Horizontal);
 		// } else {
 		// changeLayoutStyle(LayoutStyle.Vertical);
 		// }
 		// }
 		// });
 	}

 	private void createMainComposite() {
 		if (this.mainComposite != null) {
 			this.mainComposite.dispose();
 		}
 		this.mainComposite = new Composite(this.parentComposite, SWT.NONE);
 		this.mainComposite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
 		this.mainComposite.setLayout(gridLayoutWithNoMargins());

 		final int direction;
 		if (DiscoverersView.layoutStyle == DiscoverersView.LayoutStyle.Horizontal) {
 			direction = SWT.HORIZONTAL;
 		} else {
 			direction = SWT.VERTICAL;
 		}

 		this.sashForm = new SashForm(this.mainComposite, SWT.SMOOTH | direction);
 		this.sashForm.setLayout(new FillLayout());
 		this.sashForm.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));

 		Control discoverersGroup = createDiscoverersGroup(this.sashForm);
 		createParametersGroup(this.sashForm);

 		discoverersGroup.addControlListener(new ControlAdapter() {
 			@Override
 			public void controlResized(final ControlEvent e) {
 				DiscoverersView.sashPosition1 = new Integer(DiscoverersView.this.sashForm
 						.getWeights()[0]);
 				DiscoverersView.sashPosition2 = new Integer(DiscoverersView.this.sashForm
 						.getWeights()[1]);
 			}
 		});

 		if (DiscoverersView.sashPosition1 != null && DiscoverersView.sashPosition2 != null) {
 			this.sashForm.setWeights(new int[] { DiscoverersView.sashPosition1.intValue(),
 					DiscoverersView.sashPosition2.intValue() });
 		}
 		this.parentComposite.layout();
 	}

 	private Group createDiscoverersGroup(final Composite parent) {
 		Group contextGroup = new Group(parent, SWT.NONE);
 		contextGroup.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
 		contextGroup.setText(Messages.DiscoverersView_title);
 		GridLayout groupLayout = new GridLayout();
 		contextGroup.setLayout(groupLayout);
 		createDiscoverersViewer(contextGroup);
 		return contextGroup;
 	}

 	private void createDiscoverersViewer(final Group contextGroup) {
 		this.discoverersViewer = new TableViewer(contextGroup, SWT.BORDER | SWT.H_SCROLL
 				| SWT.V_SCROLL | SWT.SINGLE | SWT.FULL_SELECTION);
 		this.discoverersViewer.getTable().setLinesVisible(true);
 		this.discoverersViewer.getTable().setHeaderVisible(true);
 		this.discoverersViewer.getTable().setLayoutData(
 				new GridData(SWT.FILL, SWT.FILL, true, true));

 		this.discoverersViewer.setContentProvider(getDiscoverersContentProvider());
 		createDiscovererNameColumn(this.discoverersViewer);
 		createDiscovererInputTypeColumn(this.discoverersViewer);
 		createDiscovererImplClassColumn(this.discoverersViewer);
 		createDiscovererDeclaringBundleColumn(this.discoverersViewer);
 		this.discoverersViewer.setInput(getDiscoverersInput());

 		this.discoverersViewer.addSelectionChangedListener(new ISelectionChangedListener() {
 			public void selectionChanged(final SelectionChangedEvent event) {
 				discovererSelectionChanged();
 			}
 		});
 	}

 	private void discovererSelectionChanged() {
 		IStructuredSelection selection = (IStructuredSelection) this.discoverersViewer
 				.getSelection();
 		Object firstElement = selection.getFirstElement();
 		if (firstElement instanceof DiscovererDescription) {
 			DiscovererDescription discovererDescription = (DiscovererDescription) firstElement;
 			this.parametersViewer.setInput(discovererDescription);
 		}
 	}

 	private void createParametersGroup(final Composite parent) {
 		Group contextGroup = new Group(parent, SWT.NONE);
 		contextGroup.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
 		contextGroup.setText(Messages.DiscoverersView_params);
 		GridLayout groupLayout = new GridLayout();
 		contextGroup.setLayout(groupLayout);
 		createParametersViewer(contextGroup);
 	}

 	private void createParametersViewer(final Group contextGroup) {
 		this.parametersViewer = new TableViewer(contextGroup, SWT.BORDER | SWT.H_SCROLL
 				| SWT.V_SCROLL | SWT.SINGLE | SWT.FULL_SELECTION);
 		this.parametersViewer.getTable().setLinesVisible(true);
 		this.parametersViewer.getTable().setHeaderVisible(true);
 		this.parametersViewer.getTable()
 				.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));

 		this.parametersViewer.setContentProvider(getParametersContentProvider());
 		createParameterNameColumn(this.parametersViewer);
 		createParameterTypeColumn(this.parametersViewer);
 		createParameterDirectionColumn(this.parametersViewer);
 		createParameterRequiredColumn(this.parametersViewer);
 		createParameterDescriptionColumn(this.parametersViewer);
 	}

 	private static IContentProvider getParametersContentProvider() {
 		return new IStructuredContentProvider() {
 			public Object[] getElements(final Object inputElement) {
 				DiscovererDescription discovererDescription = (DiscovererDescription) inputElement;
 				List<DiscovererParameter> parameterDefinitions = discovererDescription
 						.getParameterDefinitions();
 				return parameterDefinitions.toArray();
 			}

 			public void inputChanged(final Viewer viewer, final Object oldInput,
 					final Object newInput) {
 				// nothing
 			}

 			public void dispose() {
 				// nothing
 			}
 		};
 	}

 	private static GridLayout gridLayoutWithNoMargins() {
 		GridLayout gridLayout = new GridLayout();
 		gridLayout.marginWidth = 0;
 		gridLayout.marginHeight = 0;
 		return gridLayout;
 	}

 	@Override
 	public void setFocus() {
 		//
 	}

 	private void createDiscovererNameColumn(final TableViewer viewer) {
 		ColumnLabelProvider columnLabelProvider = new ColumnLabelProvider() {
 			private Image discovererImage;

 			@Override
 			public String getText(final Object element) {
 				DiscovererDescription discovererDescription = (DiscovererDescription) element;
 				return discovererDescription.getId();
 			}

 			@Override
 			public Image getImage(final Object element) {
 				if (this.discovererImage == null) {
 					this.discovererImage = Activator
 							.getImageDescriptor("icons/discoverer16x16.png").createImage(); //$NON-NLS-1$
 				}
 				return this.discovererImage;
 			}

 			@Override
 			public void dispose() {
 				super.dispose();
 				if (this.discovererImage != null) {
 					this.discovererImage.dispose();
 				}
 			}
 		};
 		this.nameColumn = new PersistableColumn(Messages.DiscoverersView_name,
 				DiscoverersView.NAME_COLUMN, DiscoverersView.NAME_COLUMN_WIDTH,
 				columnLabelProvider, viewer);
 	}

 	private void createDiscovererImplClassColumn(final TableViewer viewer) {
 		ColumnLabelProvider columnLabelProvider = new ColumnLabelProvider() {
 			@Override
 			public String getText(final Object element) {
 				DiscovererDescription discovererDescription = (DiscovererDescription) element;
 				return discovererDescription.getImplementationType().getName();
 			}
 		};
 		this.implClassColumn = new PersistableColumn(Messages.DiscoverersView_implClass,
 				DiscoverersView.TYPE_COLUMN, DiscoverersView.TYPE_COLUMN_WIDTH,
 				columnLabelProvider, viewer);
 	}

 	private void createDiscovererDeclaringBundleColumn(final TableViewer viewer) {
 		ColumnLabelProvider columnLabelProvider = new ColumnLabelProvider() {
 			@Override
 			public String getText(final Object element) {
 				DiscovererDescription discovererDescription = (DiscovererDescription) element;
 				return discovererDescription.getImplementationBundle().getSymbolicName();
 			}
 		};
 		this.declaringBundleColumn = new PersistableColumn(
 				Messages.DiscoverersView_declaringBundle, DiscoverersView.DECLARING_BUNDLE_COLUMN,
 				DiscoverersView.DECLARING_BUNDLE_COLUMN_WIDTH, columnLabelProvider, viewer);

 	}

 	private void createDiscovererInputTypeColumn(final TableViewer viewer) {
 		ColumnLabelProvider columnLabelProvider = new ColumnLabelProvider() {
 			@Override
 			public String getText(final Object element) {
 				DiscovererDescription discovererDescription = (DiscovererDescription) element;
 				return discovererDescription.getSourceType().getName();
 			}
 		};
 		this.inputTypeColumn = new PersistableColumn(Messages.DiscoverersView_inputType,
 				DiscoverersView.INPUT_TYPE_COLUMN, DiscoverersView.INPUT_TYPE_COLUMN_WIDTH,
 				columnLabelProvider, viewer);

 	}

 	private void createParameterNameColumn(final TableViewer viewer) {
 		ColumnLabelProvider columnLabelProvider = new ColumnLabelProvider() {
 			@Override
 			public String getText(final Object element) {
 				DiscovererParameter discoveryParameter = (DiscovererParameter) element;
 				return discoveryParameter.getId();
 			}
 		};
 		this.paramNameColumn = new PersistableColumn(Messages.DiscoverersView_name,
 				DiscoverersView.PARAM_NAME_COLUMN, DiscoverersView.PARAM_NAME_COLUMN_WIDTH,
 				columnLabelProvider, viewer);
 	}

 	private void createParameterTypeColumn(final TableViewer viewer) {
 		ColumnLabelProvider columnLabelProvider = new ColumnLabelProvider() {
 			@Override
 			public String getText(final Object element) {
 				DiscovererParameter discoveryParameter = (DiscovererParameter) element;
 				return discoveryParameter.getType().getSimpleName();
 			}
 		};
 		this.paramTypeColumn = new PersistableColumn(Messages.DiscoverersView_type,
 				DiscoverersView.PARAM_TYPE_COLUMN, DiscoverersView.PARAM_TYPE_COLUMN_WIDTH,
 				columnLabelProvider, viewer);
 	}

 	private void createParameterDirectionColumn(final TableViewer viewer) {
 		ColumnLabelProvider columnLabelProvider = new ColumnLabelProvider() {
 			@Override
 			public String getText(final Object element) {
 				DiscovererParameter discoveryParameter = (DiscovererParameter) element;
 				return discoveryParameter.getDirection().toString();
 			}
 		};
 		this.paramDirectionColumn = new PersistableColumn(Messages.DiscoverersView_direction,
 				DiscoverersView.PARAM_DIRECTION_COLUMN,
 				DiscoverersView.PARAM_DIRECTION_COLUMN_WIDTH, columnLabelProvider, viewer);
 	}

 	private void createParameterRequiredColumn(final TableViewer viewer) {
 		ColumnLabelProvider columnLabelProvider = new ColumnLabelProvider() {
 			@Override
 			public String getText(final Object element) {
 				DiscovererParameter discoveryParameter = (DiscovererParameter) element;
 				return Boolean.toString(discoveryParameter.isRequiredInput());
 			}
 		};
 		this.paramRequiredColumn = new PersistableColumn(Messages.DiscoverersView_required,
 				DiscoverersView.PARAM_REQUIRED_COLUMN, DiscoverersView.PARAM_REQUIRED_COLUMN_WIDTH,
 				columnLabelProvider, viewer);
 	}

 	private void createParameterDescriptionColumn(final TableViewer viewer) {
 		ColumnLabelProvider columnLabelProvider = new ColumnLabelProvider() {
 			@Override
 			public String getText(final Object element) {
 				DiscovererParameter discoveryParameter = (DiscovererParameter) element;
 				return discoveryParameter.getDescription();
 			}
 		};
 		this.paramDescColumn = new PersistableColumn(Messages.DiscoverersView_description,
 				DiscoverersView.PARAM_DESCRIPTION_COLUMN,
 				DiscoverersView.PARAM_DESCRIPTION_COLUMN_WIDTH, columnLabelProvider, viewer);
 	}

 	protected static IContentProvider getDiscoverersContentProvider() {
 		return new IStructuredContentProvider() {
 			public Object[] getElements(final Object inputElement) {
 				@SuppressWarnings("unchecked")
 				Collection<DiscovererDescription> discovererDescription = (Collection<DiscovererDescription>) inputElement;
 				return discovererDescription.toArray();
 			}

 			public void inputChanged(final Viewer viewer, final Object oldInput,
 					final Object newInput) {
 				// nothing
 			}

 			public void dispose() {
 				// nothing
 			}
 		};
 	}

 	protected static Object getDiscoverersInput() {
 		return IDiscoveryManager.INSTANCE.getDiscoverers();
 	}

 	private final Action horizontalLayoutAction = new Action(Messages.DiscoverersView_horizontal,
 			IAction.AS_RADIO_BUTTON) {
 		@Override
 		public ImageDescriptor getImageDescriptor() {
 			return Activator.getImageDescriptor("icons/th_horizontal.gif"); //$NON-NLS-1$
 		}

 		@Override
 		public void run() {
 			changeLayoutStyle(DiscoverersView.LayoutStyle.Horizontal);
 		}
 	};
 	private final Action verticalLayoutAction = new Action(Messages.DiscoverersView_vertical,
 			IAction.AS_RADIO_BUTTON) {
 		@Override
 		public ImageDescriptor getImageDescriptor() {
 			return Activator.getImageDescriptor("icons/th_vertical.gif"); //$NON-NLS-1$
 		}

 		@Override
 		public void run() {
 			changeLayoutStyle(DiscoverersView.LayoutStyle.Vertical);
 		}
 	};

 	@Override
 	public void init(final IViewSite site, final IMemento memento) throws PartInitException {
 		super.init(site, memento);
 		site.getActionBars().getToolBarManager().add(this.horizontalLayoutAction);
 		site.getActionBars().getToolBarManager().add(this.verticalLayoutAction);

 		if (memento != null) {
 			PersistableColumn.loadState(memento, DiscoverersView.NAME_COLUMN);
 			PersistableColumn.loadState(memento, DiscoverersView.TYPE_COLUMN);
 			PersistableColumn.loadState(memento, DiscoverersView.INPUT_TYPE_COLUMN);
 			PersistableColumn.loadState(memento, DiscoverersView.DECLARING_BUNDLE_COLUMN);
 			PersistableColumn.loadState(memento, DiscoverersView.PARAM_NAME_COLUMN);
 			PersistableColumn.loadState(memento, DiscoverersView.PARAM_TYPE_COLUMN);
 			PersistableColumn.loadState(memento, DiscoverersView.PARAM_DIRECTION_COLUMN);
 			PersistableColumn.loadState(memento, DiscoverersView.PARAM_REQUIRED_COLUMN);
 			PersistableColumn.loadState(memento, DiscoverersView.PARAM_DESCRIPTION_COLUMN);
 			DiscoverersView.sashPosition1 = memento.getInteger(DiscoverersView.SASH_POSITION1);
 			DiscoverersView.sashPosition2 = memento.getInteger(DiscoverersView.SASH_POSITION2);
 			String layout = memento.getString(DiscoverersView.LAYOUT_ORIENTATION);
 			if (layout != null) {
 				DiscoverersView.layoutStyle = DiscoverersView.LayoutStyle.valueOf(layout);
 			}
 		}
 		if (DiscoverersView.layoutStyle == DiscoverersView.LayoutStyle.Horizontal) {
 			this.horizontalLayoutAction.setChecked(true);
 		} else {
 			this.verticalLayoutAction.setChecked(true);
 		}

 	}

 	@Override
 	public void saveState(final IMemento memento) {
 		super.saveState(memento);
 		this.nameColumn.saveState(memento);
 		this.implClassColumn.saveState(memento);
 		this.inputTypeColumn.saveState(memento);
 		this.declaringBundleColumn.saveState(memento);
 		this.paramNameColumn.saveState(memento);
 		this.paramTypeColumn.saveState(memento);
 		this.paramDirectionColumn.saveState(memento);
 		this.paramRequiredColumn.saveState(memento);
 		this.paramDescColumn.saveState(memento);
 		memento.putInteger(DiscoverersView.SASH_POSITION1, this.sashForm.getWeights()[0]);
 		memento.putInteger(DiscoverersView.SASH_POSITION2, this.sashForm.getWeights()[1]);
 		memento.putString(DiscoverersView.LAYOUT_ORIENTATION, DiscoverersView.layoutStyle.name());
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2011 Mia-Software and others.
	* All rights reserved. This program and the accompanying materials
	* are made available under the terms of the Eclipse Public License v2.0
	* which accompanies this distribution, and is available at
	* http://www.eclipse.org/legal/epl-v20.html
	*
	* Contributors:
	* Nicolas Bros (Mia-Software) - initial API and implementation
	*******************************************************************************/
	package org.eclipse.modisco.infra.discovery.ui.internal.views;

	import java.util.Collection;
	import java.util.List;

	import org.eclipse.jface.action.Action;
	import org.eclipse.jface.action.IAction;
	import org.eclipse.jface.resource.ImageDescriptor;
	import org.eclipse.jface.viewers.ColumnLabelProvider;
	import org.eclipse.jface.viewers.IContentProvider;
	import org.eclipse.jface.viewers.ISelectionChangedListener;
	import org.eclipse.jface.viewers.IStructuredContentProvider;
	import org.eclipse.jface.viewers.IStructuredSelection;
	import org.eclipse.jface.viewers.SelectionChangedEvent;
	import org.eclipse.jface.viewers.TableViewer;
	import org.eclipse.jface.viewers.Viewer;
	import org.eclipse.modisco.facet.common.ui.internal.controls.PersistableColumn;
	import org.eclipse.modisco.infra.discovery.catalog.DiscovererDescription;
	import org.eclipse.modisco.infra.discovery.catalog.DiscovererParameter;
	import org.eclipse.modisco.infra.discovery.core.IDiscoveryManager;
	import org.eclipse.modisco.infra.discovery.ui.Activator;
	import org.eclipse.modisco.infra.discovery.ui.Messages;
	import org.eclipse.swt.SWT;
	import org.eclipse.swt.custom.SashForm;
	import org.eclipse.swt.events.ControlAdapter;
	import org.eclipse.swt.events.ControlEvent;
	import org.eclipse.swt.graphics.Image;
	import org.eclipse.swt.layout.FillLayout;
	import org.eclipse.swt.layout.GridData;
	import org.eclipse.swt.layout.GridLayout;
	import org.eclipse.swt.widgets.Composite;
	import org.eclipse.swt.widgets.Control;
	import org.eclipse.swt.widgets.Group;
	import org.eclipse.ui.IMemento;
	import org.eclipse.ui.IViewSite;
	import org.eclipse.ui.PartInitException;
	import org.eclipse.ui.part.ViewPart;

	/** An Eclipse view that displays a list of available discoverers. */
	public class DiscoverersView extends ViewPart {

	private TableViewer discoverersViewer;
	private TableViewer parametersViewer;
	private Composite parentComposite;
	private Composite mainComposite;

	private static final String NAME_COLUMN = "DiscoverersView_NameColumn"; //$NON-NLS-1$
	private static final String TYPE_COLUMN = "DiscoverersView_DescriptionColumn"; //$NON-NLS-1$
	private static final String INPUT_TYPE_COLUMN = "DiscoverersView_InputTypeColumn"; //$NON-NLS-1$
	private static final String DECLARING_BUNDLE_COLUMN = "DiscoverersView_DeclaringBundleColumn"; //$NON-NLS-1$
	private static final String PARAM_NAME_COLUMN = "DiscoverersView_ParamName"; //$NON-NLS-1$
	private static final String PARAM_TYPE_COLUMN = "DiscoverersView_ParamType"; //$NON-NLS-1$
	private static final String PARAM_DIRECTION_COLUMN = "DiscoverersView_ParamDirection"; //$NON-NLS-1$
	private static final String PARAM_REQUIRED_COLUMN = "DiscoverersView_ParamRequired"; //$NON-NLS-1$
	private static final String PARAM_DESCRIPTION_COLUMN = "DiscoverersView_ParamDescription"; //$NON-NLS-1$
	private static final int NAME_COLUMN_WIDTH = 200;
	private static final int TYPE_COLUMN_WIDTH = 150;
	private static final int DECLARING_BUNDLE_COLUMN_WIDTH = 400;
	private static final int INPUT_TYPE_COLUMN_WIDTH = 150;
	private static final int PARAM_NAME_COLUMN_WIDTH = 160;
	private static final int PARAM_TYPE_COLUMN_WIDTH = 100;
	private static final int PARAM_DIRECTION_COLUMN_WIDTH = 60;
	private static final int PARAM_REQUIRED_COLUMN_WIDTH = 60;
	private static final int PARAM_DESCRIPTION_COLUMN_WIDTH = 400;

	private static final String SASH_POSITION1 = "sashPosition1"; //$NON-NLS-1$
	private static final String SASH_POSITION2 = "sashPosition2"; //$NON-NLS-1$
	private static final String LAYOUT_ORIENTATION = "orientation"; //$NON-NLS-1$

	private enum LayoutStyle {
	Horizontal, Vertical
	}

	/** static because we want to save it before closing Eclipse */
	private static LayoutStyle layoutStyle = DiscoverersView.LayoutStyle.Vertical;
	private PersistableColumn nameColumn;
	private PersistableColumn implClassColumn;
	private PersistableColumn paramNameColumn;
	private PersistableColumn paramTypeColumn;
	private PersistableColumn paramDirectionColumn;
	private PersistableColumn paramRequiredColumn;
	private PersistableColumn paramDescColumn;
	private PersistableColumn inputTypeColumn;
	private PersistableColumn declaringBundleColumn;
	private SashForm sashForm;
	private static Integer sashPosition1;
	private static Integer sashPosition2;

	protected static LayoutStyle getLayoutStyle() {
	return DiscoverersView.layoutStyle;
	}

	protected void changeLayoutStyle(final LayoutStyle newLayoutStyle) {
	if (newLayoutStyle == DiscoverersView.layoutStyle) {
	return;
	}
	DiscoverersView.layoutStyle = newLayoutStyle;
	createMainComposite();
	}

	@Override
	public void createPartControl(final Composite parent) {
	this.parentComposite = parent;
	parent.setLayout(gridLayoutWithNoMargins());
	createMainComposite();
	// automatic layout:
	// parent.addControlListener(new ControlAdapter() {
	// @Override
	// public void controlResized(final ControlEvent e) {
	// Point size = parent.getSize();
	// if (size.x > size.y) {
	// changeLayoutStyle(LayoutStyle.Horizontal);
	// } else {
	// changeLayoutStyle(LayoutStyle.Vertical);
	// }
	// }
	// });
	}

	private void createMainComposite() {
	if (this.mainComposite != null) {
	this.mainComposite.dispose();
	}
	this.mainComposite = new Composite(this.parentComposite, SWT.NONE);
	this.mainComposite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
	this.mainComposite.setLayout(gridLayoutWithNoMargins());

	final int direction;
	if (DiscoverersView.layoutStyle == DiscoverersView.LayoutStyle.Horizontal) {
	direction = SWT.HORIZONTAL;
	} else {
	direction = SWT.VERTICAL;
	}

	this.sashForm = new SashForm(this.mainComposite, SWT.SMOOTH \| direction);
	this.sashForm.setLayout(new FillLayout());
	this.sashForm.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));

	Control discoverersGroup = createDiscoverersGroup(this.sashForm);
	createParametersGroup(this.sashForm);

	discoverersGroup.addControlListener(new ControlAdapter() {
	@Override
	public void controlResized(final ControlEvent e) {
	DiscoverersView.sashPosition1 = new Integer(DiscoverersView.this.sashForm
	.getWeights()[0]);
	DiscoverersView.sashPosition2 = new Integer(DiscoverersView.this.sashForm
	.getWeights()[1]);
	}
	});

	if (DiscoverersView.sashPosition1 != null && DiscoverersView.sashPosition2 != null) {
	this.sashForm.setWeights(new int[] { DiscoverersView.sashPosition1.intValue(),
	DiscoverersView.sashPosition2.intValue() });
	}
	this.parentComposite.layout();
	}

	private Group createDiscoverersGroup(final Composite parent) {
	Group contextGroup = new Group(parent, SWT.NONE);
	contextGroup.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
	contextGroup.setText(Messages.DiscoverersView_title);
	GridLayout groupLayout = new GridLayout();
	contextGroup.setLayout(groupLayout);
	createDiscoverersViewer(contextGroup);
	return contextGroup;
	}

	private void createDiscoverersViewer(final Group contextGroup) {
	this.discoverersViewer = new TableViewer(contextGroup, SWT.BORDER \| SWT.H_SCROLL
	\| SWT.V_SCROLL \| SWT.SINGLE \| SWT.FULL_SELECTION);
	this.discoverersViewer.getTable().setLinesVisible(true);
	this.discoverersViewer.getTable().setHeaderVisible(true);
	this.discoverersViewer.getTable().setLayoutData(
	new GridData(SWT.FILL, SWT.FILL, true, true));

	this.discoverersViewer.setContentProvider(getDiscoverersContentProvider());
	createDiscovererNameColumn(this.discoverersViewer);
	createDiscovererInputTypeColumn(this.discoverersViewer);
	createDiscovererImplClassColumn(this.discoverersViewer);
	createDiscovererDeclaringBundleColumn(this.discoverersViewer);
	this.discoverersViewer.setInput(getDiscoverersInput());

	this.discoverersViewer.addSelectionChangedListener(new ISelectionChangedListener() {
	public void selectionChanged(final SelectionChangedEvent event) {
	discovererSelectionChanged();
	}
	});
	}

	private void discovererSelectionChanged() {
	IStructuredSelection selection = (IStructuredSelection) this.discoverersViewer
	.getSelection();
	Object firstElement = selection.getFirstElement();
	if (firstElement instanceof DiscovererDescription) {
	DiscovererDescription discovererDescription = (DiscovererDescription) firstElement;
	this.parametersViewer.setInput(discovererDescription);
	}
	}

	private void createParametersGroup(final Composite parent) {
	Group contextGroup = new Group(parent, SWT.NONE);
	contextGroup.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
	contextGroup.setText(Messages.DiscoverersView_params);
	GridLayout groupLayout = new GridLayout();
	contextGroup.setLayout(groupLayout);
	createParametersViewer(contextGroup);
	}

	private void createParametersViewer(final Group contextGroup) {
	this.parametersViewer = new TableViewer(contextGroup, SWT.BORDER \| SWT.H_SCROLL
	\| SWT.V_SCROLL \| SWT.SINGLE \| SWT.FULL_SELECTION);
	this.parametersViewer.getTable().setLinesVisible(true);
	this.parametersViewer.getTable().setHeaderVisible(true);
	this.parametersViewer.getTable()
	.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));

	this.parametersViewer.setContentProvider(getParametersContentProvider());
	createParameterNameColumn(this.parametersViewer);
	createParameterTypeColumn(this.parametersViewer);
	createParameterDirectionColumn(this.parametersViewer);
	createParameterRequiredColumn(this.parametersViewer);
	createParameterDescriptionColumn(this.parametersViewer);
	}

	private static IContentProvider getParametersContentProvider() {
	return new IStructuredContentProvider() {
	public Object[] getElements(final Object inputElement) {
	DiscovererDescription discovererDescription = (DiscovererDescription) inputElement;
	List<DiscovererParameter> parameterDefinitions = discovererDescription
	.getParameterDefinitions();
	return parameterDefinitions.toArray();
	}

	public void inputChanged(final Viewer viewer, final Object oldInput,
	final Object newInput) {
	// nothing
	}

	public void dispose() {
	// nothing
	}
	};
	}

	private static GridLayout gridLayoutWithNoMargins() {
	GridLayout gridLayout = new GridLayout();
	gridLayout.marginWidth = 0;
	gridLayout.marginHeight = 0;
	return gridLayout;
	}

	@Override
	public void setFocus() {
	//
	}

	private void createDiscovererNameColumn(final TableViewer viewer) {
	ColumnLabelProvider columnLabelProvider = new ColumnLabelProvider() {
	private Image discovererImage;

	@Override
	public String getText(final Object element) {
	DiscovererDescription discovererDescription = (DiscovererDescription) element;
	return discovererDescription.getId();
	}

	@Override
	public Image getImage(final Object element) {
	if (this.discovererImage == null) {
	this.discovererImage = Activator
	.getImageDescriptor("icons/discoverer16x16.png").createImage(); //$NON-NLS-1$
	}
	return this.discovererImage;
	}

	@Override
	public void dispose() {
	super.dispose();
	if (this.discovererImage != null) {
	this.discovererImage.dispose();
	}
	}
	};
	this.nameColumn = new PersistableColumn(Messages.DiscoverersView_name,
	DiscoverersView.NAME_COLUMN, DiscoverersView.NAME_COLUMN_WIDTH,
	columnLabelProvider, viewer);
	}

	private void createDiscovererImplClassColumn(final TableViewer viewer) {
	ColumnLabelProvider columnLabelProvider = new ColumnLabelProvider() {
	@Override
	public String getText(final Object element) {
	DiscovererDescription discovererDescription = (DiscovererDescription) element;
	return discovererDescription.getImplementationType().getName();
	}
	};
	this.implClassColumn = new PersistableColumn(Messages.DiscoverersView_implClass,
	DiscoverersView.TYPE_COLUMN, DiscoverersView.TYPE_COLUMN_WIDTH,
	columnLabelProvider, viewer);
	}

	private void createDiscovererDeclaringBundleColumn(final TableViewer viewer) {
	ColumnLabelProvider columnLabelProvider = new ColumnLabelProvider() {
	@Override
	public String getText(final Object element) {
	DiscovererDescription discovererDescription = (DiscovererDescription) element;
	return discovererDescription.getImplementationBundle().getSymbolicName();
	}
	};
	this.declaringBundleColumn = new PersistableColumn(
	Messages.DiscoverersView_declaringBundle, DiscoverersView.DECLARING_BUNDLE_COLUMN,
	DiscoverersView.DECLARING_BUNDLE_COLUMN_WIDTH, columnLabelProvider, viewer);

	}

	private void createDiscovererInputTypeColumn(final TableViewer viewer) {
	ColumnLabelProvider columnLabelProvider = new ColumnLabelProvider() {
	@Override
	public String getText(final Object element) {
	DiscovererDescription discovererDescription = (DiscovererDescription) element;
	return discovererDescription.getSourceType().getName();
	}
	};
	this.inputTypeColumn = new PersistableColumn(Messages.DiscoverersView_inputType,
	DiscoverersView.INPUT_TYPE_COLUMN, DiscoverersView.INPUT_TYPE_COLUMN_WIDTH,
	columnLabelProvider, viewer);

	}

	private void createParameterNameColumn(final TableViewer viewer) {
	ColumnLabelProvider columnLabelProvider = new ColumnLabelProvider() {
	@Override
	public String getText(final Object element) {
	DiscovererParameter discoveryParameter = (DiscovererParameter) element;
	return discoveryParameter.getId();
	}
	};
	this.paramNameColumn = new PersistableColumn(Messages.DiscoverersView_name,
	DiscoverersView.PARAM_NAME_COLUMN, DiscoverersView.PARAM_NAME_COLUMN_WIDTH,
	columnLabelProvider, viewer);
	}

	private void createParameterTypeColumn(final TableViewer viewer) {
	ColumnLabelProvider columnLabelProvider = new ColumnLabelProvider() {
	@Override
	public String getText(final Object element) {
	DiscovererParameter discoveryParameter = (DiscovererParameter) element;
	return discoveryParameter.getType().getSimpleName();
	}
	};
	this.paramTypeColumn = new PersistableColumn(Messages.DiscoverersView_type,
	DiscoverersView.PARAM_TYPE_COLUMN, DiscoverersView.PARAM_TYPE_COLUMN_WIDTH,
	columnLabelProvider, viewer);
	}

	private void createParameterDirectionColumn(final TableViewer viewer) {
	ColumnLabelProvider columnLabelProvider = new ColumnLabelProvider() {
	@Override
	public String getText(final Object element) {
	DiscovererParameter discoveryParameter = (DiscovererParameter) element;
	return discoveryParameter.getDirection().toString();
	}
	};
	this.paramDirectionColumn = new PersistableColumn(Messages.DiscoverersView_direction,
	DiscoverersView.PARAM_DIRECTION_COLUMN,
	DiscoverersView.PARAM_DIRECTION_COLUMN_WIDTH, columnLabelProvider, viewer);
	}

	private void createParameterRequiredColumn(final TableViewer viewer) {
	ColumnLabelProvider columnLabelProvider = new ColumnLabelProvider() {
	@Override
	public String getText(final Object element) {
	DiscovererParameter discoveryParameter = (DiscovererParameter) element;
	return Boolean.toString(discoveryParameter.isRequiredInput());
	}
	};
	this.paramRequiredColumn = new PersistableColumn(Messages.DiscoverersView_required,
	DiscoverersView.PARAM_REQUIRED_COLUMN, DiscoverersView.PARAM_REQUIRED_COLUMN_WIDTH,
	columnLabelProvider, viewer);
	}

	private void createParameterDescriptionColumn(final TableViewer viewer) {
	ColumnLabelProvider columnLabelProvider = new ColumnLabelProvider() {
	@Override
	public String getText(final Object element) {
	DiscovererParameter discoveryParameter = (DiscovererParameter) element;
	return discoveryParameter.getDescription();
	}
	};
	this.paramDescColumn = new PersistableColumn(Messages.DiscoverersView_description,
	DiscoverersView.PARAM_DESCRIPTION_COLUMN,
	DiscoverersView.PARAM_DESCRIPTION_COLUMN_WIDTH, columnLabelProvider, viewer);
	}

	protected static IContentProvider getDiscoverersContentProvider() {
	return new IStructuredContentProvider() {
	public Object[] getElements(final Object inputElement) {
	@SuppressWarnings("unchecked")
	Collection<DiscovererDescription> discovererDescription = (Collection<DiscovererDescription>) inputElement;
	return discovererDescription.toArray();
	}

	public void inputChanged(final Viewer viewer, final Object oldInput,
	final Object newInput) {
	// nothing
	}

	public void dispose() {
	// nothing
	}
	};
	}

	protected static Object getDiscoverersInput() {
	return IDiscoveryManager.INSTANCE.getDiscoverers();
	}

	private final Action horizontalLayoutAction = new Action(Messages.DiscoverersView_horizontal,
	IAction.AS_RADIO_BUTTON) {
	@Override
	public ImageDescriptor getImageDescriptor() {
	return Activator.getImageDescriptor("icons/th_horizontal.gif"); //$NON-NLS-1$
	}

	@Override
	public void run() {
	changeLayoutStyle(DiscoverersView.LayoutStyle.Horizontal);
	}
	};
	private final Action verticalLayoutAction = new Action(Messages.DiscoverersView_vertical,
	IAction.AS_RADIO_BUTTON) {
	@Override
	public ImageDescriptor getImageDescriptor() {
	return Activator.getImageDescriptor("icons/th_vertical.gif"); //$NON-NLS-1$
	}

	@Override
	public void run() {
	changeLayoutStyle(DiscoverersView.LayoutStyle.Vertical);
	}
	};

	@Override
	public void init(final IViewSite site, final IMemento memento) throws PartInitException {
	super.init(site, memento);
	site.getActionBars().getToolBarManager().add(this.horizontalLayoutAction);
	site.getActionBars().getToolBarManager().add(this.verticalLayoutAction);

	if (memento != null) {
	PersistableColumn.loadState(memento, DiscoverersView.NAME_COLUMN);
	PersistableColumn.loadState(memento, DiscoverersView.TYPE_COLUMN);
	PersistableColumn.loadState(memento, DiscoverersView.INPUT_TYPE_COLUMN);
	PersistableColumn.loadState(memento, DiscoverersView.DECLARING_BUNDLE_COLUMN);
	PersistableColumn.loadState(memento, DiscoverersView.PARAM_NAME_COLUMN);
	PersistableColumn.loadState(memento, DiscoverersView.PARAM_TYPE_COLUMN);
	PersistableColumn.loadState(memento, DiscoverersView.PARAM_DIRECTION_COLUMN);
	PersistableColumn.loadState(memento, DiscoverersView.PARAM_REQUIRED_COLUMN);
	PersistableColumn.loadState(memento, DiscoverersView.PARAM_DESCRIPTION_COLUMN);
	DiscoverersView.sashPosition1 = memento.getInteger(DiscoverersView.SASH_POSITION1);
	DiscoverersView.sashPosition2 = memento.getInteger(DiscoverersView.SASH_POSITION2);
	String layout = memento.getString(DiscoverersView.LAYOUT_ORIENTATION);
	if (layout != null) {
	DiscoverersView.layoutStyle = DiscoverersView.LayoutStyle.valueOf(layout);
	}
	}
	if (DiscoverersView.layoutStyle == DiscoverersView.LayoutStyle.Horizontal) {
	this.horizontalLayoutAction.setChecked(true);
	} else {
	this.verticalLayoutAction.setChecked(true);
	}

	}

	@Override
	public void saveState(final IMemento memento) {
	super.saveState(memento);
	this.nameColumn.saveState(memento);
	this.implClassColumn.saveState(memento);
	this.inputTypeColumn.saveState(memento);
	this.declaringBundleColumn.saveState(memento);
	this.paramNameColumn.saveState(memento);
	this.paramTypeColumn.saveState(memento);
	this.paramDirectionColumn.saveState(memento);
	this.paramRequiredColumn.saveState(memento);
	this.paramDescColumn.saveState(memento);
	memento.putInteger(DiscoverersView.SASH_POSITION1, this.sashForm.getWeights()[0]);
	memento.putInteger(DiscoverersView.SASH_POSITION2, this.sashForm.getWeights()[1]);
	memento.putString(DiscoverersView.LAYOUT_ORIENTATION, DiscoverersView.layoutStyle.name());
	}
	}