Java tutorial
/* * Copyright 2017 Marcus Portmann * * 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 guru.mmp.application.web.template.pages; //~--- non-JDK imports -------------------------------------------------------- import guru.mmp.application.codes.Code; import guru.mmp.application.codes.ICodesService; import guru.mmp.application.web.WebApplicationException; import guru.mmp.application.web.pages.WebPageSecurity; import guru.mmp.application.web.template.TemplateSecurity; import guru.mmp.application.web.template.components.Dialog; import guru.mmp.application.web.template.components.PagingNavigator; import guru.mmp.application.web.template.data.CodeDataProvider; import guru.mmp.common.util.StringUtil; import org.apache.wicket.PageReference; import org.apache.wicket.ajax.AjaxRequestTarget; import org.apache.wicket.ajax.markup.html.AjaxLink; import org.apache.wicket.markup.html.WebMarkupContainer; import org.apache.wicket.markup.html.basic.Label; import org.apache.wicket.markup.html.link.Link; import org.apache.wicket.markup.repeater.Item; import org.apache.wicket.markup.repeater.ReuseIfModelsEqualStrategy; import org.apache.wicket.markup.repeater.data.DataView; import org.apache.wicket.model.IModel; import org.apache.wicket.model.Model; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import javax.inject.Inject; import java.util.UUID; //~--- JDK imports ------------------------------------------------------------ /** * The <code>CodeAdministrationPage</code> class implements the * "Code Administration" page for the Web Application Template. * * @author Marcus Portmann */ @WebPageSecurity(TemplateSecurity.FUNCTION_CODE_CODE_ADMINISTRATION) class CodeAdministrationPage extends TemplateWebPage { /* Logger */ private static final Logger logger = LoggerFactory.getLogger(CodeAdministrationPage.class); private static final long serialVersionUID = 1000000; /* Codes Service */ @Inject private ICodesService codesService; /** * Constructs a new <code>CodeAdministrationPage</code>. * * @param previousPage the previous page * @param codeCategoryId the Universally Unique Identifier (UUID) used to uniquely identify the * code category the codes are associated with * @param codeCategoryName the name of the code category */ CodeAdministrationPage(PageReference previousPage, UUID codeCategoryId, String codeCategoryName) { super("Codes", codeCategoryName); try { /* * The table container, which allows the table and its associated navigator to be updated * using AJAX. */ WebMarkupContainer tableContainer = new WebMarkupContainer("tableContainer"); tableContainer.setOutputMarkupId(true); add(tableContainer); // The dialog used to confirm the removal of a code RemoveDialog removeDialog = new RemoveDialog(tableContainer); add(removeDialog); // The "addLink" link Link<Void> addLink = new Link<Void>("addLink") { private static final long serialVersionUID = 1000000; @Override public void onClick() { AddCodePage page = new AddCodePage(getPageReference(), codeCategoryId); setResponsePage(page); } }; tableContainer.add(addLink); // The "backLink" link Link<Void> backLink = new Link<Void>("backLink") { private static final long serialVersionUID = 1000000; @Override public void onClick() { setResponsePage(previousPage.getPage()); } }; tableContainer.add(backLink); // The code data view CodeDataProvider dataProvider = new CodeDataProvider(codeCategoryId); DataView<Code> dataView = new DataView<Code>("code", dataProvider) { private static final long serialVersionUID = 1000000; @Override protected void populateItem(Item<Code> item) { Code code = item.getModelObject(); String name = StringUtil.truncate(code.getName(), 25); String value = StringUtil.truncate(code.getValue(), 30); item.add(new Label("name", Model.of(name))); item.add(new Label("value", Model.of(value))); // The "updateLink" link Link<Void> updateLink = new Link<Void>("updateLink") { private static final long serialVersionUID = 1000000; @Override public void onClick() { UpdateCodePage page = new UpdateCodePage(getPageReference(), item.getModel()); setResponsePage(page); } }; item.add(updateLink); // The "removeLink" link AjaxLink<Void> removeLink = new AjaxLink<Void>("removeLink") { private static final long serialVersionUID = 1000000; @Override public void onClick(AjaxRequestTarget target) { removeDialog.show(target, item.getModel()); } }; item.add(removeLink); } }; dataView.setItemsPerPage(10); dataView.setItemReuseStrategy(ReuseIfModelsEqualStrategy.getInstance()); tableContainer.add(dataView); tableContainer.add(new PagingNavigator("navigator", dataView)); } catch (Throwable e) { throw new WebApplicationException("Failed to initialise the CodeAdministrationPage", e); } } /** * The <code>RemoveDialog</code> class implements a dialog that allows the removal * of a code to be confirmed. */ private class RemoveDialog extends Dialog { private static final long serialVersionUID = 1000000; private UUID categoryId; private String id; private Label nameLabel; /** * Constructs a new <code>RemoveDialog</code>. * * @param tableContainer the table container, which allows the code table and its * associated navigator to be updated using AJAX */ RemoveDialog(WebMarkupContainer tableContainer) { super("removeDialog"); nameLabel = new Label("name", Model.of("")); nameLabel.setOutputMarkupId(true); add(nameLabel); // The "removeLink" link AjaxLink<Void> removeLink = new AjaxLink<Void>("removeLink") { private static final long serialVersionUID = 1000000; @Override public void onClick(AjaxRequestTarget target) { try { codesService.deleteCode(categoryId, id); target.add(tableContainer); CodeAdministrationPage.this .info("Successfully removed the code " + nameLabel.getDefaultModelObjectAsString()); } catch (Throwable e) { logger.error(String.format("Failed to remove the code (%s) for the code category (%s): %s", id, categoryId, e.getMessage()), e); CodeAdministrationPage.this .error("Failed to remove the code " + nameLabel.getDefaultModelObjectAsString()); } target.add(getAlerts()); hide(target); } }; add(removeLink); } /** * Show the dialog using Ajax. * * @param target the AJAX request target * @param codeModel the model for the code being removed */ public void show(AjaxRequestTarget target, IModel<Code> codeModel) { Code code = codeModel.getObject(); if (code != null) { id = code.getId(); categoryId = code.getCategoryId(); nameLabel.setDefaultModelObject(code.getName()); target.add(nameLabel); super.show(target); } } } }