Java tutorial
/* * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you 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.apache.isis.viewer.wicket.ui.components.collectioncontents.ajaxtable; import java.util.Iterator; import java.util.List; import java.util.Map; import org.apache.wicket.ajax.AjaxRequestTarget; import org.apache.wicket.event.Broadcast; import org.apache.wicket.extensions.markup.html.repeater.data.sort.SortOrder; import org.apache.wicket.extensions.markup.html.repeater.data.table.DataTable; import org.apache.wicket.extensions.markup.html.repeater.data.table.IColumn; import org.apache.wicket.extensions.markup.html.repeater.data.table.ISortableDataProvider; import org.apache.wicket.extensions.markup.html.repeater.data.table.NoRecordsToolbar; import org.apache.wicket.markup.ComponentTag; import org.apache.wicket.markup.repeater.IItemFactory; import org.apache.wicket.markup.repeater.IItemReuseStrategy; import org.apache.wicket.markup.repeater.Item; import org.apache.wicket.markup.repeater.OddEvenItem; import org.apache.wicket.model.IModel; import org.apache.wicket.util.lang.Generics; import org.apache.isis.core.metamodel.adapter.ObjectAdapter; import org.apache.isis.core.metamodel.spec.ObjectSpecification; import org.apache.isis.viewer.wicket.model.hints.IsisSelectorEvent; import org.apache.isis.viewer.wicket.model.hints.UiHintContainer; import org.apache.isis.viewer.wicket.model.models.EntityModel; import org.apache.isis.viewer.wicket.ui.util.CssClassAppender; public class IsisAjaxFallbackDataTable<T, S> extends DataTable<T, S> { private static final long serialVersionUID = 1L; static final String UIHINT_PAGE_NUMBER = "pageNumber"; private final ISortableDataProvider<T, S> dataProvider; private IsisAjaxFallbackHeadersToolbar<S> headersToolbar; private IsisAjaxNavigationToolbar navigationToolbar; public IsisAjaxFallbackDataTable(final String id, final List<? extends IColumn<T, S>> columns, final ISortableDataProvider<T, S> dataProvider, final int rowsPerPage) { super(id, columns, dataProvider, rowsPerPage); this.dataProvider = dataProvider; setOutputMarkupId(true); setVersioned(false); setItemReuseStrategy(new PreserveModelReuseStrategy()); } @Override protected void onInitialize() { super.onInitialize(); buildGui(); } private void buildGui() { headersToolbar = new IsisAjaxFallbackHeadersToolbar<>(this, this.dataProvider); addTopToolbar(headersToolbar); navigationToolbar = new IsisAjaxNavigationToolbar(this); addBottomToolbar(navigationToolbar); addBottomToolbar(new NoRecordsToolbar(this)); } @Override protected Item<T> newRowItem(final String id, final int index, final IModel<T> model) { return new OddEvenItem<T>(id, index, model) { @Override protected void onComponentTag(ComponentTag tag) { super.onComponentTag(tag); if (model instanceof EntityModel) { EntityModel entityModel = (EntityModel) model; final ObjectAdapter objectAdapter = entityModel.getObject(); final ObjectSpecification typeOfSpecification = entityModel.getTypeOfSpecification(); String cssClass = typeOfSpecification.getCssClass(objectAdapter); CssClassAppender.appendCssClassTo(tag, cssClass); } } }; } static class PreserveModelReuseStrategy implements IItemReuseStrategy { private static final long serialVersionUID = 1L; private static IItemReuseStrategy instance = new PreserveModelReuseStrategy(); /** * @return static instance */ public static IItemReuseStrategy getInstance() { return instance; } /** * @see org.apache.wicket.markup.repeater.IItemReuseStrategy#getItems(org.apache.wicket.markup.repeater.IItemFactory, * java.util.Iterator, java.util.Iterator) */ @Override public <T> Iterator<Item<T>> getItems(final IItemFactory<T> factory, final Iterator<IModel<T>> newModels, Iterator<Item<T>> existingItems) { final Map<IModel<T>, Item<T>> modelToItem = Generics.newHashMap(); while (existingItems.hasNext()) { final Item<T> item = existingItems.next(); modelToItem.put(item.getModel(), item); } return new Iterator<Item<T>>() { private int index = 0; @Override public boolean hasNext() { return newModels.hasNext(); } @Override public Item<T> next() { final IModel<T> model = newModels.next(); final Item<T> oldItem = modelToItem.get(model); final IModel<T> model2 = oldItem != null ? oldItem.getModel() : model; return factory.newItem(index++, model2); } @Override public void remove() { throw new UnsupportedOperationException(); } }; } } public void honourHints() { headersToolbar.honourSortOrderHints(); navigationToolbar.honourSortOrderHints(); honourPageNumberHint(); } private void honourPageNumberHint() { UiHintContainer uiHintContainer = getUiHintContainer(); if (uiHintContainer == null) { return; } final String pageNumberStr = uiHintContainer.getHint(this, UIHINT_PAGE_NUMBER); if (pageNumberStr != null) { try { long pageNumber = Long.parseLong(pageNumberStr); if (pageNumber >= 0) { // dataTable is clever enough to deal with too-large numbers this.setCurrentPage(pageNumber); } } catch (Exception ex) { // ignore. } } uiHintContainer.setHint(this, UIHINT_PAGE_NUMBER, "" + getCurrentPage()); // don't broadcast (no AjaxRequestTarget, still configuring initial setup) } public void setPageNumberHintAndBroadcast(AjaxRequestTarget target) { final UiHintContainer uiHintContainer = getUiHintContainer(); if (uiHintContainer == null) { return; } uiHintContainer.setHint(this, IsisAjaxFallbackDataTable.UIHINT_PAGE_NUMBER, "" + getCurrentPage()); } public void setSortOrderHintAndBroadcast(SortOrder order, String property, AjaxRequestTarget target) { final UiHintContainer uiHintContainer = getUiHintContainer(); if (uiHintContainer == null) { return; } // first clear all SortOrder hints... for (SortOrder eachSortOrder : SortOrder.values()) { uiHintContainer.clearHint(this, eachSortOrder.name()); } // .. then set this one uiHintContainer.setHint(this, order.name(), property); } private UiHintContainer getUiHintContainer() { return UiHintContainer.Util.hintContainerOf(this, EntityModel.class); } }