Java tutorial
/* Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.activiti.explorer.ui.form; import java.util.HashMap; import java.util.List; import java.util.Map; import org.activiti.engine.form.FormProperty; import org.activiti.engine.form.FormType; import org.activiti.explorer.ExplorerApp; import com.vaadin.data.Validator.InvalidValueException; import com.vaadin.ui.Alignment; import com.vaadin.ui.Component; import com.vaadin.ui.Field; import com.vaadin.ui.Form; import com.vaadin.ui.VerticalLayout; /** * A component capable of rendering a form based on form-properties and * extracting values filled in into the writable fields. * * @author Frederik Heremans */ public class FormPropertiesComponent extends VerticalLayout { private static final long serialVersionUID = 1L; protected FormPropertyRendererManager formPropertyRendererManager; protected List<FormProperty> formProperties; protected Map<FormProperty, Component> propertyComponents; protected Form form; public FormPropertiesComponent() { this.formPropertyRendererManager = ExplorerApp.get().getFormPropertyRendererManager(); setSizeFull(); initForm(); } public List<FormProperty> getFormProperties() { return formProperties; } public void setFormProperties(List<FormProperty> formProperties) { this.formProperties = formProperties; form.removeAllProperties(); // Clear current components in the grid if (formProperties != null) { for (FormProperty formProperty : formProperties) { FormPropertyRenderer renderer = getRenderer(formProperty); // Be able to get the Form from any Renderer. renderer.setForm(form); Field editorComponent = renderer.getPropertyField(formProperty); if (editorComponent != null) { // Get label for editor component. form.addField(formProperty.getId(), editorComponent); } } } } /** * Returns all values filled in in the writable fields on the form. * * @throws InvalidValueException when a validation error occurs. */ public Map<String, String> getFormPropertyValues() throws InvalidValueException { // Commit the form to ensure validation is executed form.commit(); Map<String, String> formPropertyValues = new HashMap<String, String>(); // Get values from fields defined for each form property for (FormProperty formProperty : formProperties) { if (formProperty.isWritable()) { Field field = form.getField(formProperty.getId()); FormPropertyRenderer renderer = getRenderer(formProperty); String fieldValue = renderer.getFieldValue(formProperty, field); formPropertyValues.put(formProperty.getId(), fieldValue); } } return formPropertyValues; } public void setFormEnabled(boolean enabled) { if (enabled) { form.setEnabled(enabled); } } protected void initForm() { form = new Form(); form.setSizeFull(); addComponent(form); setComponentAlignment(form, Alignment.TOP_CENTER); } protected FormPropertyRenderer getRenderer(FormProperty formProperty) { FormType formPropertyType = formProperty.getType(); if (formPropertyType == null) { return formPropertyRendererManager.getTypeLessFormPropertyRenderer(); } else { return formPropertyRendererManager.getPropertyRendererForType(formProperty.getType()); } } }