Java tutorial
/** * Copyright (C) 2012 BonitaSoft S.A. * BonitaSoft, 31 rue Gustave Eiffel - 38000 Grenoble * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 2.0 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package org.bonitasoft.studio.contract.ui.expression; import java.util.Collection; import java.util.Collections; import java.util.HashSet; import java.util.List; import java.util.Set; import org.bonitasoft.studio.common.ExpressionConstants; import org.bonitasoft.studio.common.emf.tools.ExpressionHelper; import org.bonitasoft.studio.contract.core.expression.ContractInputExpressionProvider; import org.bonitasoft.studio.contract.i18n.Messages; import org.bonitasoft.studio.expression.editor.provider.IExpressionEditor; import org.bonitasoft.studio.expression.editor.provider.IExpressionProvider; import org.bonitasoft.studio.expression.editor.provider.SelectionAwareExpressionEditor; import org.bonitasoft.studio.expression.editor.viewer.ExpressionViewer; import org.bonitasoft.studio.model.expression.Expression; import org.bonitasoft.studio.model.expression.ExpressionPackage; import org.bonitasoft.studio.model.process.ContractInput; import org.eclipse.core.databinding.UpdateValueStrategy; import org.eclipse.core.databinding.conversion.Converter; import org.eclipse.core.databinding.conversion.IConverter; import org.eclipse.core.databinding.observable.value.IObservableValue; import org.eclipse.emf.databinding.EMFDataBindingContext; import org.eclipse.emf.databinding.EMFObservables; import org.eclipse.emf.ecore.EObject; import org.eclipse.emf.ecore.util.EcoreUtil; import org.eclipse.jface.databinding.swt.SWTObservables; import org.eclipse.jface.databinding.viewers.IViewerObservableValue; import org.eclipse.jface.databinding.viewers.ViewersObservables; import org.eclipse.jface.layout.GridDataFactory; import org.eclipse.jface.layout.GridLayoutFactory; import org.eclipse.jface.viewers.ISelectionChangedListener; import org.eclipse.jface.viewers.SelectionChangedEvent; import org.eclipse.jface.viewers.TableViewer; import org.eclipse.jface.viewers.ViewerFilter; import org.eclipse.swt.SWT; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Text; /** * @author Romain Bioteau * */ public class ContractInputExpressionEditor extends SelectionAwareExpressionEditor implements IExpressionEditor { private ContractInputTableViewer viewer; private Expression editorInputExpression; private Text typeText; private final ContractInputExpressionProvider contractInputExpressionProvider; public ContractInputExpressionEditor(final ContractInputExpressionProvider contractInputExpressionProvider) { this.contractInputExpressionProvider = contractInputExpressionProvider; } @Override public Control createExpressionEditor(final Composite parent, final EMFDataBindingContext ctx) { final Composite mainComposite = new Composite(parent, SWT.NONE); mainComposite.setLayoutData(GridDataFactory.fillDefaults().grab(true, true).create()); mainComposite.setLayout(GridLayoutFactory.fillDefaults().numColumns(1).create()); viewer = new ContractInputTableViewer(mainComposite, SWT.FULL_SELECTION | SWT.BORDER | SWT.SINGLE | SWT.V_SCROLL); viewer.getTable().setLayoutData(GridDataFactory.fillDefaults().grab(true, true).create()); viewer.initialize(); viewer.addPostSelectionChangedListener(new ISelectionChangedListener() { @Override public void selectionChanged(final SelectionChangedEvent event) { if (!event.getSelection().isEmpty()) { ContractInputExpressionEditor.this.fireSelectionChanged(); } } }); createReturnTypeComposite(parent); return mainComposite; } protected void createReturnTypeComposite(final Composite parent) { final Composite typeComposite = new Composite(parent, SWT.NONE); typeComposite.setLayoutData(GridDataFactory.fillDefaults().grab(true, false).create()); final GridLayout gl = new GridLayout(2, false); gl.marginWidth = 0; gl.marginHeight = 0; typeComposite.setLayout(gl); final Label typeLabel = new Label(typeComposite, SWT.NONE); typeLabel.setText(Messages.returnType); typeLabel.setLayoutData(GridDataFactory.fillDefaults().align(SWT.FILL, SWT.CENTER).create()); typeText = new Text(typeComposite, SWT.BORDER | SWT.READ_ONLY); typeText.setLayoutData(GridDataFactory.fillDefaults().grab(true, false).align(SWT.FILL, SWT.CENTER) .indent(10, 0).create()); } private void updateViewerInput(final EObject context) { final Set<ContractInput> input = new HashSet<ContractInput>(); final IExpressionProvider provider = getContractInputExpressionProvider(); final Set<Expression> expressions = provider.getExpressions(context); for (final Expression expression : expressions) { if (editorInputExpression.isReturnTypeFixed()) { if (compatibleReturnType(editorInputExpression, expression)) { input.add(getContractInputFromExpression(expression)); } } else { input.add(getContractInputFromExpression(expression)); } } viewer.setInput(input); } public ContractInput getContractInputFromExpression(final Expression expression) { return (ContractInput) expression.getReferencedElements().get(0); } protected IExpressionProvider getContractInputExpressionProvider() { return contractInputExpressionProvider; } @Override public void bindExpression(final EMFDataBindingContext dataBindingContext, final EObject context, final Expression inputExpression, final ViewerFilter[] filters, final ExpressionViewer expressionViewer) { editorInputExpression = inputExpression; updateViewerInput(context); final IObservableValue contentObservable = EMFObservables.observeValue(inputExpression, ExpressionPackage.Literals.EXPRESSION__CONTENT); final IObservableValue nameObservable = EMFObservables.observeValue(inputExpression, ExpressionPackage.Literals.EXPRESSION__NAME); final IObservableValue returnTypeObservable = EMFObservables.observeValue(inputExpression, ExpressionPackage.Literals.EXPRESSION__RETURN_TYPE); final IObservableValue referenceObservable = EMFObservables.observeValue(inputExpression, ExpressionPackage.Literals.EXPRESSION__REFERENCED_ELEMENTS); final IViewerObservableValue observeSingleSelection = ViewersObservables.observeSingleSelection(viewer); dataBindingContext.bindValue(observeSingleSelection, EMFObservables.observeValue(inputExpression, ExpressionPackage.Literals.EXPRESSION__TYPE), selectionToTypeStrategy(), new UpdateValueStrategy(UpdateValueStrategy.POLICY_NEVER)); dataBindingContext.bindValue(observeSingleSelection, nameObservable, selectionToInputNameStrategy(), new UpdateValueStrategy(UpdateValueStrategy.POLICY_NEVER)); dataBindingContext.bindValue(observeSingleSelection, contentObservable, selectionToInputNameStrategy(), new UpdateValueStrategy(UpdateValueStrategy.POLICY_NEVER)); dataBindingContext.bindValue(observeSingleSelection, returnTypeObservable, selectionToReturnTypeStrategy(), new UpdateValueStrategy(UpdateValueStrategy.POLICY_NEVER)); dataBindingContext.bindValue(observeSingleSelection, referenceObservable, selectionToContractInputStrategy(), contractInputToSelectionStrategy()); dataBindingContext.bindValue(SWTObservables.observeText(typeText, SWT.Modify), returnTypeObservable); } protected UpdateValueStrategy selectionToTypeStrategy() { final UpdateValueStrategy strategy = new UpdateValueStrategy(); final IConverter converter = new Converter(ContractInput.class, String.class) { @Override public Object convert(final Object input) { return ExpressionConstants.CONTRACT_INPUT_TYPE; } }; strategy.setConverter(converter); return strategy; } protected UpdateValueStrategy contractInputToSelectionStrategy() { final UpdateValueStrategy referencedDataToSelection = new UpdateValueStrategy(); final IConverter referencetoDataConverter = new Converter(List.class, ContractInput.class) { @SuppressWarnings("unchecked") @Override public Object convert(final Object inputList) { final List<ContractInput> list = (List<ContractInput>) inputList; if (!list.isEmpty()) { final ContractInput contractInput = list.get(0); final Collection<ContractInput> inputs = (Collection<ContractInput>) viewer.getInput(); for (final ContractInput input : inputs) { if (EcoreUtil.equals(input, contractInput)) { return input; } } } return null; } }; referencedDataToSelection.setConverter(referencetoDataConverter); return referencedDataToSelection; } protected UpdateValueStrategy selectionToContractInputStrategy() { final UpdateValueStrategy strategy = new UpdateValueStrategy(); final IConverter referenceConverter = new Converter(ContractInput.class, List.class) { @Override public Object convert(final Object data) { if (data != null) { return Collections.singletonList(data); } else { return Collections.emptyList(); } } }; strategy.setConverter(referenceConverter); return strategy; } protected UpdateValueStrategy selectionToReturnTypeStrategy() { final UpdateValueStrategy strategy = new UpdateValueStrategy(); final IConverter returnTypeConverter = new Converter(ContractInput.class, String.class) { @Override public Object convert(final Object input) { return ExpressionHelper.getContractInputReturnType((ContractInput) input); } }; strategy.setConverter(returnTypeConverter); return strategy; } protected UpdateValueStrategy selectionToInputNameStrategy() { final UpdateValueStrategy strategy = new UpdateValueStrategy(); final IConverter nameConverter = new Converter(ContractInput.class, String.class) { @Override public Object convert(final Object data) { return ((ContractInput) data).getName(); } }; strategy.setConverter(nameConverter); return strategy; } @Override public boolean canFinish() { return !viewer.getSelection().isEmpty(); } protected TableViewer getViewer() { return viewer; } protected Expression getExpression() { return editorInputExpression; } }