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.cayenne.modeler.util; import org.apache.cayenne.map.DbAttribute; import org.apache.cayenne.modeler.Application; import org.apache.cayenne.modeler.util.combo.AutoCompletion; import org.apache.commons.lang.StringUtils; import javax.swing.AbstractCellEditor; import javax.swing.BorderFactory; import javax.swing.DefaultComboBoxModel; import javax.swing.DefaultListCellRenderer; import javax.swing.ImageIcon; import javax.swing.JComboBox; import javax.swing.JComponent; import javax.swing.JLabel; import javax.swing.JList; import javax.swing.JPanel; import javax.swing.JTable; import javax.swing.ListCellRenderer; import javax.swing.event.PopupMenuEvent; import javax.swing.event.PopupMenuListener; import javax.swing.table.TableCellEditor; import javax.swing.text.JTextComponent; import java.awt.BorderLayout; import java.awt.Component; import java.awt.Font; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.KeyAdapter; import java.awt.event.KeyEvent; import java.util.ArrayList; import java.util.List; import java.util.regex.Pattern; /** * This class used as cell editor, when you need to * choose path in comboBox and use autocompletion. */ @SuppressWarnings("WeakerAccess") public abstract class PathChooserComboBoxCellEditor extends AbstractCellEditor implements TableCellEditor, ActionListener, PopupMenuListener { protected JComboBox<String> comboBoxPathChooser; protected int previousEmbeddedLevel = 0; protected EntityTreeModel treeModel; protected int row; private JTable table; protected abstract void enterPressed(JTable table); protected abstract EntityTreeModel createTreeModelForComboBox(int indexInTable); protected abstract Object getCurrentNodeToInitializeCombo(CayenneTableModel model, int row); protected abstract String getPathToInitializeCombo(CayenneTableModel model, int row); protected void initializeCombo(CayenneTableModel model, int row, final JTable table) { Object currentNode = getCurrentNodeToInitializeCombo(model, row); String dbAttributePath = getPathToInitializeCombo(model, row); List<String> nodeChildren = getChildren(currentNode, dbAttributePath); this.table = table; comboBoxPathChooser = Application.getWidgetFactory().createComboBox(nodeChildren, false); comboBoxPathChooser.getEditor().getEditorComponent().addKeyListener(new KeyAdapter() { @Override public void keyReleased(KeyEvent event) { if (event.getKeyCode() == KeyEvent.VK_ENTER) { enterPressed(table); return; } parsePathString(event.getKeyChar()); } }); AutoCompletion.enable(comboBoxPathChooser, true, true); ((JComponent) comboBoxPathChooser.getEditor().getEditorComponent()).setBorder(null); comboBoxPathChooser.setBorder(BorderFactory.createEmptyBorder(0, 5, 0, 0)); comboBoxPathChooser.setRenderer(new PathChooserComboBoxCellRenderer()); comboBoxPathChooser.addActionListener(this); comboBoxPathChooser.addPopupMenuListener(this); } private void setComboModelAccordingToPath(String pathString) { List<String> currentNodeChildren = new ArrayList<>(); currentNodeChildren.addAll(getChildren(getCurrentNode(pathString), pathString)); comboBoxPathChooser.setModel(new DefaultComboBoxModel<>(currentNodeChildren.toArray(new String[0]))); comboBoxPathChooser.setSelectedItem(pathString); if (!pathString.isEmpty()) { comboBoxPathChooser.showPopup(); } } protected void parsePathString(char lastEnteredCharacter) { JTextComponent editorComponent = (JTextComponent) (comboBoxPathChooser).getEditor().getEditorComponent(); String pathString = editorComponent.getText(); if (pathString != null && pathString.isEmpty()) { setComboModelAccordingToPath(""); previousEmbeddedLevel = 0; return; } if (lastEnteredCharacter == '.') { processDotEntered(); previousEmbeddedLevel = StringUtils.countMatches(pathString, "."); return; } int currentEmbeddedLevel = StringUtils.countMatches(pathString, "."); if (previousEmbeddedLevel != currentEmbeddedLevel) { previousEmbeddedLevel = currentEmbeddedLevel; String[] pathStrings = pathString.split(Pattern.quote(".")); String lastStringInPath = pathStrings[pathStrings.length - 1]; String saveDbAttributePath = pathString; pathString = pathString.replaceAll(lastStringInPath + "$", ""); List<String> currentNodeChildren = new ArrayList<>(); currentNodeChildren.addAll(getChildren(getCurrentNode(pathString), pathString)); comboBoxPathChooser.setModel(new DefaultComboBoxModel<>(currentNodeChildren.toArray(new String[0]))); comboBoxPathChooser.setSelectedItem(saveDbAttributePath); } } protected void processDotEntered() { JTextComponent editorComponent = (JTextComponent) (comboBoxPathChooser).getEditor().getEditorComponent(); String dbAttributePath = editorComponent.getText(); if (".".equals(dbAttributePath)) { setComboModelAccordingToPath(""); return; } char secondFromEndCharacter = dbAttributePath.charAt(dbAttributePath.length() - 2); if (secondFromEndCharacter == '.') { // two dots entered one by one , we replace it by one dot editorComponent.setText(dbAttributePath.substring(0, dbAttributePath.length() - 1)); return; } String[] pathStrings = dbAttributePath.split(Pattern.quote(".")); String lastStringInPath = pathStrings[pathStrings.length - 1]; //we will check if lastStringInPath is correct name of DbAttribute or DbRelationship //for appropriate previous node in path. if it is not we won't add entered dot to dbAttributePath String dbAttributePathForPreviousNode; if (pathStrings.length == 1) { //previous root is treeModel.getRoot() dbAttributePathForPreviousNode = ""; } else { dbAttributePathForPreviousNode = dbAttributePath.replaceAll('.' + lastStringInPath + ".$", ""); } List<String> potentialVariantsToChoose = getChildren(getCurrentNode(dbAttributePathForPreviousNode), ""); if (potentialVariantsToChoose.contains(lastStringInPath) && !(getCurrentNode(dbAttributePath) instanceof DbAttribute)) { setComboModelAccordingToPath(dbAttributePath); } else { editorComponent.setText(dbAttributePath.substring(0, dbAttributePath.length() - 1)); } } /** * find current node by path * * @param pathString db path * @return last node in path which matches DbRelationship or DbAttribute */ protected Object getCurrentNode(String pathString) { //case for new attribute if (pathString == null || pathString.isEmpty()) { return treeModel.getRoot(); } String[] pathStrings = pathString.split(Pattern.quote(".")); Object root = treeModel.getRoot(); for (String rootChildText : pathStrings) { for (int j = 0; j < treeModel.getChildCount(root); j++) { Object child = treeModel.getChild(root, j); String objectName = ModelerUtil.getObjectName(child); if (objectName.equals(rootChildText)) { root = child; break; } } } return root; } /** * @param node for which we will find children * @param pathString string which will be added to each child to make right autocomplete * @return list with children , which will be used to autocomplete */ protected List<String> getChildren(Object node, String pathString) { List<String> currentNodeChildren = new ArrayList<>(); for (int j = 0; j < treeModel.getChildCount(node); j++) { Object child = treeModel.getChild(node, j); String relationshipName = ModelerUtil.getObjectName(child); currentNodeChildren.add(pathString + relationshipName); } return currentNodeChildren; } @Override public void actionPerformed(ActionEvent e) { //for some reason comboBoxPathChooser don't load selected item text, so we made it by hand if (comboBoxPathChooser.getSelectedIndex() != (-1)) { ((JTextComponent) (comboBoxPathChooser).getEditor().getEditorComponent()) .setText(comboBoxPathChooser.getSelectedItem().toString()); } } @Override public void popupMenuWillBecomeInvisible(PopupMenuEvent e) { if (comboBoxPathChooser.getSelectedIndex() != -1 && !((JTextComponent) (comboBoxPathChooser).getEditor().getEditorComponent()).getText().isEmpty()) { enterPressed(table); } } @Override public void popupMenuWillBecomeVisible(PopupMenuEvent e) { } @Override public void popupMenuCanceled(PopupMenuEvent e) { } private final class PathChooserComboBoxCellRenderer extends DefaultListCellRenderer { private final ImageIcon rightArrow = ModelerUtil.buildIcon("scroll_right.gif"); @SuppressWarnings("unchecked") @Override public Component getListCellRendererComponent(JList<?> list, Object value, int index, boolean isSelected, boolean cellHasFocus) { JPanel panel = new JPanel(new BorderLayout()); JLabel label = new JLabel((String) value); label.setFont(new Font("Verdana", Font.PLAIN, 12)); panel.add(label); Object currentNode = getCurrentNode((String) value); if (treeModel.isLeaf(currentNode)) { ListCellRenderer leafRenderer = CellRenderers.listRenderer(); return leafRenderer.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus); } else { DefaultListCellRenderer nonLeafTextRenderer = new DefaultListCellRenderer(); Component text = nonLeafTextRenderer.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus); panel.setBackground(text.getBackground()); panel.add(new JLabel(rightArrow), BorderLayout.EAST); return panel; } } } }