Java tutorial
/* * Copyright (c) 2012 Data Harmonisation Panel * * All rights reserved. This program and the accompanying materials are made * available under the terms of the GNU Lesser General Public License as * published by the Free Software Foundation, either version 3 of the License, * or (at your option) any later version. * * You should have received a copy of the GNU Lesser General Public License * along with this distribution. If not, see <http://www.gnu.org/licenses/>. * * Contributors: * Data Harmonisation Panel <http://www.dhpanel.eu> */ package eu.esdihumboldt.hale.ui.scripting.mathematical; import java.util.ArrayList; import java.util.Collection; import java.util.Collections; import org.eclipse.jface.fieldassist.ControlDecoration; import org.eclipse.jface.fieldassist.FieldDecoration; import org.eclipse.jface.fieldassist.FieldDecorationRegistry; import org.eclipse.jface.layout.GridDataFactory; import org.eclipse.jface.layout.GridLayoutFactory; import org.eclipse.jface.layout.TableColumnLayout; import org.eclipse.jface.viewers.ArrayContentProvider; import org.eclipse.jface.viewers.ColumnWeightData; import org.eclipse.jface.viewers.TableViewer; import org.eclipse.jface.viewers.TableViewerColumn; import org.eclipse.jface.viewers.Viewer; import org.eclipse.jface.viewers.ViewerFilter; import org.eclipse.swt.SWT; import org.eclipse.swt.events.ModifyEvent; import org.eclipse.swt.events.ModifyListener; import org.eclipse.swt.events.MouseAdapter; import org.eclipse.swt.events.MouseEvent; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Text; import eu.esdihumboldt.hale.common.align.model.condition.impl.BindingCondition; import eu.esdihumboldt.hale.common.align.model.impl.PropertyEntityDefinition; import eu.esdihumboldt.hale.common.align.transformation.function.PropertyValue; import eu.esdihumboldt.hale.common.align.transformation.function.impl.PropertyValueImpl; import eu.esdihumboldt.hale.common.schema.model.constraint.type.Binding; import eu.esdihumboldt.hale.common.scripting.Script; import eu.esdihumboldt.hale.ui.HaleUI; import eu.esdihumboldt.hale.ui.common.definition.viewer.DefinitionLabelProvider; import eu.esdihumboldt.hale.ui.common.editors.AbstractEditor; /** * Editor for math scripts. * * @author Kai Schwierczek */ public class MathEditor extends AbstractEditor<String> { private final Composite composite; private Text textField; private TableViewer varTable; private Collection<PropertyEntityDefinition> variables = Collections.emptySet(); private boolean valid; private final Script script; private String currentValue = ""; private final ControlDecoration decorator; /** * Default constructor. * * @param parent the parent composite * @param script the script object */ public MathEditor(Composite parent, Script script) { this.script = script; composite = new Composite(parent, SWT.NONE); // left margin 5 for control decoration composite.setLayout(GridLayoutFactory.swtDefaults().margins(0, 0).create()); // input field textField = new Text(composite, SWT.SINGLE | SWT.BORDER); textField.setLayoutData(GridDataFactory.fillDefaults().grab(true, false).indent(7, 0).create()); // control decoration decorator = new ControlDecoration(textField, SWT.LEFT | SWT.TOP, composite); // set initial status decorator.hide(); // set image FieldDecoration fieldDecoration = FieldDecorationRegistry.getDefault() .getFieldDecoration(FieldDecorationRegistry.DEC_ERROR); decorator.setImage(fieldDecoration.getImage()); textField.addModifyListener(new ModifyListener() { @Override public void modifyText(ModifyEvent e) { // update value String newValue = textField.getText(); fireValueChanged(VALUE, currentValue, newValue); currentValue = newValue; validate(); } }); // variables Label label = new Label(composite, SWT.NONE); label.setText("Available variables (double click to insert)"); label.setLayoutData(new GridData(SWT.BEGINNING, SWT.CENTER, false, false)); // variables table Composite tableComposite = new Composite(composite, SWT.NONE); tableComposite.setLayoutData(GridDataFactory.fillDefaults().grab(true, true).create()); TableColumnLayout columnLayout = new TableColumnLayout(); tableComposite.setLayout(columnLayout); varTable = new TableViewer(tableComposite, SWT.BORDER | SWT.SINGLE | SWT.FULL_SELECTION); varTable.addFilter(new ViewerFilter() { @Override public boolean select(Viewer viewer, Object parentElement, Object element) { PropertyEntityDefinition def = (PropertyEntityDefinition) element; Class<?> binding = def.getDefinition().getPropertyType().getConstraint(Binding.class).getBinding(); return BindingCondition.isCompatibleClass(Double.class, true, binding, true); } }); TableViewerColumn column = new TableViewerColumn(varTable, SWT.NONE); columnLayout.setColumnData(column.getColumn(), new ColumnWeightData(1, false)); varTable.setContentProvider(ArrayContentProvider.getInstance()); varTable.setLabelProvider(new DefinitionLabelProvider(true, true) { /** * @see eu.esdihumboldt.hale.ui.common.definition.viewer.DefinitionLabelProvider#getText(java.lang.Object) */ @Override public String getText(Object element) { return MathEditor.this.script.getVariableName((PropertyEntityDefinition) element); } }); varTable.getTable().addMouseListener(new MouseAdapter() { /** * @see MouseAdapter#mouseDoubleClick(MouseEvent) */ @Override public void mouseDoubleClick(MouseEvent e) { int index = varTable.getTable().getSelectionIndex(); if (index >= 0) { String var = varTable.getTable().getItem(index).getText(); textField.insert(var); textField.setFocus(); } } }); validate(); } /** * Validates the current input against the currently available variables. */ private void validate() { String result = MathEditor.this.script.validate(currentValue, createPropertyValues(), HaleUI.getServiceProvider()); boolean oldValid = valid; valid = result == null; if (result == null) decorator.hide(); else { decorator.setDescriptionText(result); decorator.show(); } if (valid != oldValid) fireStateChanged(IS_VALID, oldValid, valid); } /** * Returns an {@link Iterable} for the current variables for use with the * {@link Script}. * * @return an {@link Iterable} for the current variables for use with the * {@link Script} */ protected Iterable<PropertyValue> createPropertyValues() { Collection<PropertyValue> result = new ArrayList<PropertyValue>(variables.size()); // using double results in no /0 exceptions because of stuff like // 1/(a-b) Double one = Double.valueOf(1); for (PropertyEntityDefinition property : variables) result.add(new PropertyValueImpl(one, property)); return result; } /** * @see eu.esdihumboldt.hale.ui.common.Editor#getControl() */ @Override public Control getControl() { return composite; } /** * @see eu.esdihumboldt.hale.ui.common.Editor#setValue(java.lang.Object) */ @Override public void setValue(String value) { textField.setText(value); currentValue = value; } /** * @see eu.esdihumboldt.hale.ui.common.Editor#getValue() */ @Override public String getValue() { return currentValue; } /** * @see eu.esdihumboldt.hale.ui.common.Editor#setAsText(java.lang.String) */ @Override public void setAsText(String text) { setValue(text); } /** * @see eu.esdihumboldt.hale.ui.common.Editor#getAsText() */ @Override public String getAsText() { return getValue(); } /** * @see eu.esdihumboldt.hale.ui.common.Editor#isValid() */ @Override public boolean isValid() { return valid; } /** * @see eu.esdihumboldt.hale.ui.common.editors.AbstractEditor#setVariables(java.util.Collection) */ @Override public void setVariables(Collection<PropertyEntityDefinition> properties) { variables = properties; varTable.setInput(variables); validate(); } /** * @see eu.esdihumboldt.hale.ui.common.Editor#getValueType() */ @Override public String getValueType() { return script.getId(); } }