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/*
 * Tentackle - http://www.tentackle.org.
 *
 * This library 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 library 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 library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

package org.tentackle.fx.rdc;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import javafx.collections.ObservableList;
import javafx.scene.control.TreeItem;
import org.tentackle.pdo.PersistentDomainObject;

/**
 * Tree item for a PDO.
 *
 * @author harald
 * @param  the pdo type
 */
public class PdoTreeItem> extends TreeItem {

  private T pdo;
  private GuiProvider provider;
  private boolean childrenLoaded;

  /**
   * Creates a tree item for a PDO.
   *
   * @param pdo the pdo
   */
  public PdoTreeItem(T pdo) {
    super(pdo);
    this.pdo = pdo;
  }

  /**
   * Returns the PDO represented by this item.
   *
   * @return the PDO
   */
  public T getPdo() {
    return pdo;
  }

  /**
   * Sets the pdo.
* Can be used to reload the pdo, for example. * * @param pdo the pdo */ public void setPdo(T pdo) { setValue(pdo); this.pdo = pdo; provider = null; // force reload } @Override public boolean isLeaf() { return !getGuiProvider().providesTreeChildObjects(); } @Override public ObservableList> getChildren() { if (!childrenLoaded) { childrenLoaded = true; List> childList = new ArrayList<>(); PdoTreeItem parentItem = getParentPdoItem(); for (PersistentDomainObject child: getGuiProvider().getTreeChildObjects(parentItem == null ? null : parentItem.getPdo())) { @SuppressWarnings("unchecked") TreeItem treeItem = GuiProviderFactory.getInstance().createGuiProvider(child).createTreeItem(); childList.add(treeItem); } super.getChildren().setAll(childList); } return super.getChildren(); } /** * Gets the parent PdoTreeItem. * * @param

the parent PDO type * @return the parent, null if no parent or parent is no PdoTreeItem */ @SuppressWarnings("unchecked") public

> PdoTreeItem

getParentPdoItem() { TreeItem parent = getParent(); return parent instanceof PdoTreeItem ? (PdoTreeItem) parent : null; } /** * Gets the parent item's pdo. * * @param

the parent PDO type * @param parentPdoClass the entity class of the parent PDO * @return the parent pdo, null if no parent or parent is no PdoTreeItem or not pointing to an instance of {@code parentPdoClass} */ @SuppressWarnings({"unchecked", "rawtypes"}) public

> P getParentPdo(Class

parentPdoClass) { TreeItem parent = getParent(); if (parent instanceof PdoTreeItem) { PersistentDomainObject parentPdo = ((PdoTreeItem) parent).getPdo(); if (parentPdo != null && parentPdoClass.isAssignableFrom(parentPdo.getClass())) { return (P) parentPdo; } } return null; } /** * Lazily gets the GUI provider for the PDO. * * @return the provider, never null */ public GuiProvider getGuiProvider() { if (provider == null) { provider = GuiProviderFactory.getInstance().createGuiProvider(pdo); } return provider; } /** * Expands this and all child tree items. */ public void expand() { if (isExpanded()) { collapse(); } expand(new HashSet<>()); } /** * Collapses this and all child tree items. */ public void collapse() { collapse(new HashSet<>()); } /** * Recursively expands given item and all child items. * * @param pdoSet holds already expanded PDOs to detect recursion loops */ protected void expand(Set pdoSet) { if (getGuiProvider().providesTreeChildObjects()) { if (pdoSet.add(getPdo())) { setExpanded(true); for (TreeItem childItem : getChildren()) { ((PdoTreeItem) childItem).expand(pdoSet); } } } } /** * Recursively collapses given item and all child items. * * @param pdoSet holds already collapsed PDOs to detect recursion loops */ protected void collapse(Set pdoSet) { if (pdoSet.add(getPdo())) { setExpanded(false); for (TreeItem childItem : getChildren()) { ((PdoTreeItem) childItem).collapse(pdoSet); } } } }





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