Java tutorial
/******************************************************************************* * Copyright (c) 2014 Fraunhofer IWU 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: * Fraunhofer IWU - initial API and implementation *******************************************************************************/ package net.enilink.komma.edit.ui.wizards; import java.util.Collection; import net.enilink.komma.core.IReference; import net.enilink.komma.core.IStatement; import net.enilink.komma.edit.refactor.Change; import net.enilink.komma.edit.refactor.Change.StatementChange; import net.enilink.komma.edit.refactor.Change.StatementChange.Type; import net.enilink.komma.edit.ui.KommaEditUIPlugin; import net.enilink.komma.edit.ui.provider.ExtendedImageRegistry; import org.eclipse.jface.viewers.ColumnLabelProvider; import org.eclipse.jface.viewers.ITreeContentProvider; import org.eclipse.jface.viewers.ITreeViewerListener; import org.eclipse.jface.viewers.TreeExpansionEvent; import org.eclipse.jface.viewers.TreeViewer; import org.eclipse.jface.viewers.TreeViewerColumn; import org.eclipse.jface.viewers.Viewer; import org.eclipse.jface.viewers.ViewerComparator; import org.eclipse.jface.wizard.WizardPage; import org.eclipse.swt.SWT; import org.eclipse.swt.graphics.Color; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Tree; public abstract class RefactorPreviewPage extends WizardPage { protected TreeViewer treeViewer; public RefactorPreviewPage(String pageName) { super(pageName); } /** * This method is called upon making the page visible to determine the set * of changes that are to be previewed. It needs to be implemented by * subclasses. * * @return The set of changes to preview. Should be generated using the * RefactoringProcessor. */ public abstract Collection<Change> collectChanges(); static class TreeLabelProvider extends ColumnLabelProvider { public static enum ColumnType { RESOURCE, PROPERTY, VALUE }; ColumnType column; Color addBg = new Color(Display.getDefault(), 240, 255, 240); Color removeBg = new Color(Display.getDefault(), 255, 240, 240); public TreeLabelProvider(ColumnType column) { this.column = column; } @Override public void dispose() { super.dispose(); addBg.dispose(); removeBg.dispose(); } @Override public Color getBackground(Object element) { if (element instanceof StatementChange) { if (((StatementChange) element).getType() == Type.ADD) { return addBg; } else { return removeBg; } } return null; } @Override public Image getImage(Object element) { if (element instanceof Change) { switch (column) { case RESOURCE: return ExtendedImageRegistry.getInstance() .getImage(KommaEditUIPlugin.INSTANCE.getImage("full/obj16/OWLFile.png")); default: return null; } } return null; } @Override public String getText(Object element) { if (element instanceof Change) { switch (column) { case RESOURCE: return ((Change) element).getModel().toString(); default: return null; } } if (element instanceof StatementChange) { IStatement st = ((StatementChange) element).getStatement(); switch (column) { case RESOURCE: return st.getSubject().toString(); case PROPERTY: return st.getPredicate().toString(); case VALUE: return st.getObject().toString(); default: return null; } } return null; } }; @Override public void createControl(Composite parent) { Composite composite = new Composite(parent, SWT.NONE); composite.setLayout(new GridLayout()); final Tree tree = new Tree(composite, SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL | SWT.FULL_SELECTION); tree.setHeaderVisible(true); tree.setLinesVisible(true); GridData treeGridData = new GridData(SWT.FILL, SWT.FILL, true, true); tree.setLayoutData(treeGridData); treeViewer = new TreeViewer(tree); treeViewer.setContentProvider(new ITreeContentProvider() { @Override public void inputChanged(Viewer viewer, Object oldInput, Object newInput) { } @SuppressWarnings("unchecked") @Override public Object[] getElements(Object inputElement) { if (inputElement instanceof Collection) { return ((Collection<Change>) inputElement).toArray(); } return getChildren(inputElement); } @Override public Object[] getChildren(Object parentElement) { if (parentElement instanceof Change) { return ((Change) parentElement).getStatementChanges().toArray(); } return null; } @Override public Object getParent(Object element) { return null; } @Override public boolean hasChildren(Object element) { if (element instanceof Change) { return true; } return false; } @Override public void dispose() { } }); treeViewer.addTreeListener(new ITreeViewerListener() { @Override public void treeCollapsed(final TreeExpansionEvent event) { getShell().getDisplay().asyncExec(new Runnable() { @Override public void run() { treeViewer.update(event.getElement(), null); } }); } @Override public void treeExpanded(final TreeExpansionEvent event) { getShell().getDisplay().asyncExec(new Runnable() { @Override public void run() { treeViewer.update(event.getElement(), null); } }); } }); treeViewer.setComparator(new ViewerComparator() { @Override public int compare(Viewer viewer, Object o1, Object o2) { if (o1 instanceof Change && o2 instanceof Change) { return ((Change) o1).getModel().toString().compareTo(((Change) o2).getModel().toString()); } if (o1 instanceof StatementChange && o2 instanceof StatementChange) { return compare(((StatementChange) o1).getStatement().getSubject(), ((StatementChange) o2).getStatement().getSubject()); } return o1.hashCode() - o2.hashCode(); } private int compare(IReference s1, IReference s2) { // blank nodes at bottom if (s1.getURI() == null) { return (s2.getURI() == null ? s1.toString().compareTo(s2.toString()) : 1); } if (s2.getURI() == null) { return -1; } // compare the URIs return s1.toString().compareTo(s2.toString()); } }); TreeViewerColumn column = new TreeViewerColumn(treeViewer, SWT.LEFT); column.getColumn().setText("Resource"); column.getColumn().setWidth(350); column.setLabelProvider(new TreeLabelProvider(TreeLabelProvider.ColumnType.RESOURCE)); column = new TreeViewerColumn(treeViewer, SWT.LEFT); column.getColumn().setText("Property"); column.getColumn().setWidth(350); column.setLabelProvider(new TreeLabelProvider(TreeLabelProvider.ColumnType.PROPERTY)); column = new TreeViewerColumn(treeViewer, SWT.LEFT); column.getColumn().setAlignment(SWT.LEFT); column.getColumn().setText("Value"); column.getColumn().setWidth(350); column.setLabelProvider(new TreeLabelProvider(TreeLabelProvider.ColumnType.VALUE)); setDescription("Preview and confirm the pending changes."); setControl(composite); setPageComplete(false); } @Override public void setVisible(boolean visible) { super.setVisible(visible); if (visible) { treeViewer.setInput(collectChanges()); setPageComplete(true); } } }