Java tutorial
/* * JBoss, Home of Professional Open Source * Copyright 2005, JBoss Inc., and individual contributors as indicated * by the @authors tag. See the copyright.txt in the distribution for a * full listing of individual contributors. * * This is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as * published by the Free Software Foundation; either version 2.1 of * the License, or (at your option) any later version. * * This software 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this software; if not, write to the Free * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA * 02110-1301 USA, or see the FSF site: http://www.fsf.org. */ package org.jbpm.gd.jpdl.properties; import java.io.ByteArrayInputStream; import java.io.IOException; import java.io.InputStreamReader; import java.io.StringWriter; import java.util.ArrayList; import java.util.List; import org.dom4j.Attribute; import org.dom4j.Document; import org.dom4j.DocumentException; import org.dom4j.Element; import org.dom4j.io.OutputFormat; import org.dom4j.io.SAXReader; import org.dom4j.io.XMLWriter; import org.eclipse.core.resources.IFile; import org.eclipse.core.runtime.CoreException; import org.eclipse.core.runtime.IPath; import org.eclipse.core.runtime.IStatus; import org.eclipse.core.runtime.Status; import org.eclipse.draw2d.ColorConstants; import org.eclipse.jface.dialogs.StatusDialog; import org.eclipse.swt.events.KeyAdapter; import org.eclipse.swt.events.KeyEvent; import org.eclipse.swt.graphics.Point; import org.eclipse.swt.layout.FormAttachment; import org.eclipse.swt.layout.FormData; import org.eclipse.swt.layout.FormLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Text; import org.eclipse.ui.IEditorPart; import org.eclipse.ui.PlatformUI; import org.eclipse.ui.forms.widgets.FormToolkit; import org.eclipse.ui.part.FileEditorInput; import org.jbpm.gd.jpdl.Logger; import org.jbpm.gd.jpdl.Plugin; import org.jbpm.gd.jpdl.model.Variable; import org.jbpm.gd.jpdl.model.VariableContainer; import org.jbpm.gd.jpdl.taskform.Field; import org.jbpm.gd.jpdl.taskform.FieldType; import org.jbpm.gd.jpdl.taskform.FormGenerator; public class TaskFormGenerationDialog extends StatusDialog { private static final String pluginId = Plugin.getDefault().getBundle().getSymbolicName(); private static final IStatus okStatus = new Status(Status.INFO, pluginId, 0, "Press OK to generate a form in the specified filename.", null); private static final IStatus noFileNameStatus = new Status(Status.ERROR, pluginId, 0, "Please specify a correct filename.", null); String taskName; FormToolkit toolkit; VariableContainerConfigurationComposite fieldComposite; VariableContainer fieldContainer; VariableContainerConfigurationComposite buttonComposite; VariableContainer buttonContainer; Label fileNameLabel; Text fileNameText; Composite fieldArea; Composite buttonArea; public TaskFormGenerationDialog(Shell parentShell, String taskName) { super(parentShell); toolkit = new FormToolkit(parentShell.getDisplay()); fieldContainer = new VariableContainerImpl(); buttonContainer = new VariableContainerImpl(); this.taskName = taskName; } public boolean close() { toolkit.dispose(); return super.close(); } protected Point getInitialSize() { return new Point(550, 475); } protected Control createDialogArea(Composite parent) { Composite area = (Composite) super.createDialogArea(parent); area.setLayout(new FormLayout()); fieldArea = toolkit.createComposite(area); fieldArea.setBackground(ColorConstants.menuBackground); fieldArea.setLayout(new FormLayout()); buttonArea = toolkit.createComposite(area); buttonArea.setBackground(ColorConstants.menuBackground); buttonArea.setLayout(new FormLayout()); Composite formFileArea = toolkit.createComposite(area); formFileArea.setBackground(ColorConstants.menuBackground); formFileArea.setLayout(new FormLayout()); fieldArea.setLayoutData(createFieldAreaLayoutData()); buttonArea.setLayoutData(createButtonAreaLayoutData()); formFileArea.setLayoutData(createFormFileAreaLayoutData()); createFieldComposite(fieldArea); createButtonComposite(buttonArea); createFormFileField(formFileArea); getShell().setText("Generate Task Form"); return area; } protected Button createButton(Composite parent, int id, String label, boolean defaultButton) { return super.createButton(parent, id, label, false); } private FormData createFieldAreaLayoutData() { FormData result = new FormData(); result.top = new FormAttachment(0, 10); result.left = new FormAttachment(0, 10); result.right = new FormAttachment(100, -10); result.height = 175; return result; } private FormData createButtonAreaLayoutData() { FormData result = new FormData(); result.top = new FormAttachment(fieldArea, 0); result.left = new FormAttachment(0, 10); result.right = new FormAttachment(100, -10); result.height = 125; return result; } private FormData createFormFileAreaLayoutData() { FormData result = new FormData(); result.top = new FormAttachment(buttonArea, 0); result.left = new FormAttachment(0, 0); result.right = new FormAttachment(100, 0); result.bottom = new FormAttachment(100, 0); return result; } private void createFieldComposite(Composite area) { String[] columnTitles = new String[] { "Variable Name", "Label", "Read", "Write", "Required" }; fieldComposite = VariableContainerConfigurationComposite.create(toolkit, area, false, columnTitles); fieldComposite.setVariableContainer(fieldContainer); fieldComposite.setBackground(ColorConstants.menuBackground); fieldComposite.setMessage("Define the form fields:"); fieldComposite.setVariableDefaultName("field"); } private void createButtonComposite(Composite area) { String[] columnTitles = new String[] { "Transition Name", "Label" }; buttonComposite = VariableContainerConfigurationComposite.create(toolkit, area, true, columnTitles); buttonComposite.setVariableContainer(buttonContainer); buttonComposite.setBackground(ColorConstants.menuBackground); buttonComposite.setMessage("Define the form buttons:"); buttonComposite.setVariableDefaultName("button"); } private void createFormFileField(Composite area) { fileNameLabel = toolkit.createLabel(area, "File name:"); fileNameLabel.setBackground(ColorConstants.menuBackground); createFileText(area); fileNameLabel.setLayoutData(createFileNameLabelLayoutData()); fileNameText.setLayoutData(createFileNameTextLayoutData()); } private FormData createFileNameLabelLayoutData() { FormData result = new FormData(); result.left = new FormAttachment(0, 15); result.top = new FormAttachment(0, 12); return result; } private FormData createFileNameTextLayoutData() { FormData result = new FormData(); result.top = new FormAttachment(0, 10); result.left = new FormAttachment(fileNameLabel, 5); result.right = new FormAttachment(100, -77); return result; } private void createFileText(Composite area) { fileNameText = toolkit.createText(area, ""); if (taskName == null || "".equals(taskName)) { taskName = "default"; } int i = taskName.length(); fileNameText.setText(taskName + ".xhtml"); fileNameText.setSelection(0, i); fileNameText.addKeyListener(new KeyAdapter() { public void keyReleased(KeyEvent e) { checkFileName(); } }); checkFileName(); } private void checkFileName() { String fileName = fileNameText.getText(); if (fileName == null || "".equals(fileName)) { updateStatus(noFileNameStatus); } else { updateStatus(okStatus); } } protected void okPressed() { generateForm(); super.okPressed(); } private void generateForm() { createTaskFormFile(); updateFormsXmlFile(); refreshProcessFolder(); } private void refreshProcessFolder() { try { getInputFile().getParent().refreshLocal(1, null); } catch (CoreException e) { Logger.logError("Problem while refreshing process folder.", e); } } private boolean isEmpty(String str) { return str == null || "".equals(str); } private void createTaskFormFile() { Variable[] fieldVars = fieldContainer.getVariables(); List fields = new ArrayList(); for (int i = 0; i < fieldVars.length; i++) { Field field = new Field(); field.setVariableName(fieldVars[i].getName()); field.setLabel( isEmpty(fieldVars[i].getMappedName()) ? fieldVars[i].getName() : fieldVars[i].getMappedName()); field.setReadOnly(!fieldVars[i].isWritable() && fieldVars[i].isReadable()); field.setFieldType(FieldType.getFieldTypes()[0]); fields.add(field); } Variable[] buttonVariables = buttonContainer.getVariables(); List buttons = new ArrayList(); buttons.add(org.jbpm.gd.jpdl.taskform.Button.BUTTON_SAVE); buttons.add(org.jbpm.gd.jpdl.taskform.Button.BUTTON_CANCEL); for (int i = 0; i < buttonVariables.length; i++) { String name = "name"; String label; if (!isEmpty(buttonVariables[i].getName())) { name = buttonVariables[i].getName(); } if (!isEmpty(buttonVariables[i].getMappedName())) { label = buttonVariables[i].getMappedName(); } else { label = name; } buttons.add(org.jbpm.gd.jpdl.taskform.Button.createTransitionButton(name, label)); } getFile(fileNameText.getText(), FormGenerator.getForm(fields, buttons)); } private void updateFormsXmlFile() { IFile file = getInputFile(); IPath path = file.getProjectRelativePath(); file = file.getProject().getFile(path.removeLastSegments(1).append("forms.xml")); try { if (!file.exists()) { file.create(new ByteArrayInputStream("<forms/>".getBytes()), true, null); } } catch (CoreException e) { Logger.logError("Could not create forms.xml", e); } Document document = getDocument(file); addForm(document); saveDocument(file, document); } private void saveDocument(IFile formFile, Document document) { try { StringWriter stringWriter = new StringWriter(); XMLWriter xmlWriter = new XMLWriter(stringWriter, OutputFormat.createPrettyPrint()); xmlWriter.write(document); formFile.setContents(new ByteArrayInputStream(stringWriter.getBuffer().toString().getBytes()), true, true, null); } catch (IOException e) { Logger.logError("Problem writing xml document to file", e); } catch (CoreException e) { Logger.logError("Problem writing xml document to file", e); } } private Element getElementFor(String taskName, Document document) { List list = document.getRootElement().elements("form"); for (int i = 0; i < list.size(); i++) { Element element = (Element) list.get(i); String candidate = element.attributeValue("task"); if (candidate != null && candidate.equals(taskName)) { return element; } } return null; } private void addForm(Document document) { Element element = getElementFor(taskName, document); if (element == null) { element = document.getRootElement().addElement("form"); element.addAttribute("task", taskName); } Attribute form = element.attribute("form"); if (form == null) { element.addAttribute("form", fileNameText.getText()); } else { form.setValue(fileNameText.getText()); } } private Document getDocument(IFile file) { try { return new SAXReader().read(new InputStreamReader(file.getContents())); } catch (DocumentException e) { Logger.logError("Problem creating DOM document from forms.xml", e); } catch (CoreException e) { Logger.logError("Problem getting the contents from forms.xml", e); } return null; } private IFile getInputFile() { IEditorPart editorPart = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage() .getActiveEditor(); return ((FileEditorInput) editorPart.getEditorInput()).getFile(); } private IFile getFile(String name, String initialContents) { IFile file = getInputFile(); IPath path = file.getProjectRelativePath(); file = file.getProject().getFile(path.removeLastSegments(1).append(name)); try { if (!file.exists()) { file.create(new ByteArrayInputStream(initialContents.getBytes()), true, null); } else { file.setContents(new ByteArrayInputStream(initialContents.getBytes()), true, true, null); } } catch (CoreException e) { Logger.logError("Could not create " + name, e); } return file; } private class VariableContainerImpl implements VariableContainer { ArrayList variables = new ArrayList(); public void addVariable(Variable variable) { variables.add(variable); } public Variable[] getVariables() { return (Variable[]) variables.toArray(new Variable[variables.size()]); } public void removeVariable(Variable variable) { variables.remove(variable); } } }