Application: gvSIG desktop

package org.gvsig.expressionevaluator.swing.impl;

import java.awt.Color;

import java.awt.Dimension;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.KeyAdapter;

import java.awt.event.KeyEvent;

import java.util.Objects;

import javax.swing.JEditorPane;

import javax.swing.JMenuItem;

import javax.swing.JOptionPane;

import javax.swing.JPopupMenu;

import javax.swing.JScrollPane;

import javax.swing.Timer;

import javax.swing.event.DocumentEvent;

import javax.swing.event.DocumentListener;

import javax.swing.text.JTextComponent;

import org.apache.commons.lang3.StringUtils;

import org.gvsig.expressionevaluator.Expression;

import org.gvsig.expressionevaluator.ExpressionEvaluatorLocator;

import org.gvsig.expressionevaluator.ExpressionEvaluatorManager;

import org.gvsig.expressionevaluator.ExpressionRuntimeException;

import org.gvsig.expressionevaluator.ExpressionSyntaxException;

import org.gvsig.expressionevaluator.MutableSymbolTable;

import org.gvsig.expressionevaluator.swing.ExpressionBuilderConfig;

import org.gvsig.tools.ToolsLocator;

import org.gvsig.tools.i18n.I18nManager;

import org.gvsig.tools.swing.api.ToolsSwingLocator;

import org.gvsig.tools.swing.api.ToolsSwingManager;

import org.gvsig.tools.swing.api.windowmanager.Dialog;

import org.gvsig.tools.swing.api.windowmanager.WindowManager;

import org.gvsig.tools.swing.api.windowmanager.WindowManager_v2;

/**

 *

 * @author jjdelcerro

 */

@SuppressWarnings("UseSpecificCatch")

public abstract class AbstractAutomaticExpressionChecker {

    private static final Color COLOR_ERROR = new Color(255,225,232);

    private JTextComponent text;

    private ExpressionBuilderConfig config;

    private Color color_ok;

    private Timer timerExpression;

    private JMenuItem menuItemShowPreview;

    private JMenuItem menuItemShowTip;

    private JMenuItem menuItemShowMessage;

    private String message;

    protected String tip;

    private String preview;

    private DocumentListener doclistener;

    private KeyAdapter keylistener;

    private ActionListener timelistener;

    public AbstractAutomaticExpressionChecker(ExpressionBuilderConfig config, JTextComponent theText) {

        this.text = theText;

        this.config = config;

        this.initComponents();

    }

    private void initComponents() {

        final I18nManager i18n = ToolsLocator.getI18nManager();

        final ToolsSwingManager toolsSwingManager = ToolsSwingLocator.getToolsSwingManager();

        this.color_ok = this.text.getBackground();

        toolsSwingManager.setDefaultPopupMenu(this.text);

        toolsSwingManager.addClearButton(this.text);

        JPopupMenu popupMenu = this.text.getComponentPopupMenu();

        this.menuItemShowTip = new JMenuItem(i18n.getTranslation("_Show_tip"));

        this.menuItemShowTip.addActionListener(new ActionListener() {

            @Override

            public void actionPerformed(ActionEvent e) {

                if( StringUtils.isBlank(tip) ) {

                    return;

                }

                JOptionPane.showMessageDialog(

                        text.getParent(), 

                        tip, 

                        i18n.getTranslation("Tip"), 

                        JOptionPane.INFORMATION_MESSAGE

                );

            }

        });

        popupMenu.add(this.menuItemShowTip);

        this.menuItemShowPreview = new JMenuItem(i18n.getTranslation("_Show_preview"));

        this.menuItemShowPreview.addActionListener(new ActionListener() {

            @Override

            public void actionPerformed(ActionEvent e) {

                showMessageDialog(

                        i18n.getTranslation("_Preview_value"),

                        preview

                );

            }

        });

        popupMenu.add(this.menuItemShowPreview);

        this.menuItemShowMessage = new JMenuItem(i18n.getTranslation("_Show_message"));

        this.menuItemShowMessage.addActionListener(new ActionListener() {

            @Override

            public void actionPerformed(ActionEvent e) {

                showMessageDialog(

                        i18n.getTranslation("_Message"),

                        message

                );

            }

        });

        popupMenu.add(this.menuItemShowMessage);

        this.timelistener = new ActionListener() {

            @Override

            public void actionPerformed(ActionEvent e) {

                doCheckExpression();

            }

        };

        this.doclistener = new DocumentListener() {

            @Override

            public void insertUpdate(DocumentEvent e) {

                timerExpression.restart();

            }

            @Override

            public void removeUpdate(DocumentEvent e) {

                timerExpression.restart();

            }

            @Override

            public void changedUpdate(DocumentEvent e) {

                timerExpression.restart();

            }

        };

        this.keylistener = new KeyAdapter() {

            @Override

            public void keyPressed(KeyEvent e) {

                if (e.getKeyCode() == KeyEvent.VK_C && e.isControlDown()) {

                    doCheckExpression();

                }

            }

        };

        this.timerExpression = new Timer(3000, this.timelistener);

        this.timerExpression.setRepeats(false);

        this.text.getDocument().addDocumentListener(this.doclistener);

        this.text.addKeyListener(this.keylistener);

    }

    private void doCheckExpression() {

        if( this.text == null || this.config == null ) {

            return;

        }

        Expression expression = this.getExpression();

        this.setTip(null);

        this.setPreview(null);

        this.setMessage(JOptionPane.INFORMATION_MESSAGE, null);

        if (expression == null) {

            return;

        }

        try {

            expression.getCode();

            this.setMessage(JOptionPane.INFORMATION_MESSAGE, "");

        } catch (ExpressionSyntaxException ex) {

            this.setMessage(JOptionPane.ERROR_MESSAGE, ex.getDescription());

            return;

        } catch (Exception ex) {

            this.setMessage(JOptionPane.ERROR_MESSAGE, "Syntax error in expression");

            return;

        }

        if (this.config.getPreviewSymbolTable() == null) {

            try {

                ExpressionEvaluatorManager theManager = ExpressionEvaluatorLocator.getManager();

                MutableSymbolTable symbolTable = theManager.createSymbolTable();

                Object theValue = expression.execute(symbolTable);

                this.setPreview(theValue);

            } catch (Exception ex) {

                this.setMessage(JOptionPane.INFORMATION_MESSAGE, "");

            }

        } else {

            try {

                Object theValue = expression.execute(this.config.getPreviewSymbolTable());

                this.setPreview(theValue);

            } catch (ExpressionRuntimeException ex) {

                this.setTip(ex.getTip());

                this.setMessage(JOptionPane.ERROR_MESSAGE, "Runtime error. " + ex.getMessage());

            } catch (Exception ex) {

                this.setMessage(JOptionPane.ERROR_MESSAGE, "Runtime error. " + ex.getMessage());

            }

        }

    }

    protected boolean isTipEnabled() {

        return !StringUtils.isBlank(this.tip);

    }

    protected boolean isPreviewEnabled() {

        return !StringUtils.isBlank(this.preview);

    }

    protected boolean isMessageEnabled() {

        return !StringUtils.isBlank(this.message);

    }

    protected String getTip() {

        return this.tip;

    }

    protected String getMessage() {

        return this.message;

    }

    protected String getPreview() {

        return this.preview; 

    }

    protected void showMessageDialog() {

        final I18nManager i18n = ToolsLocator.getI18nManager();

        if( this.isMessageEnabled() ) {

            this.showMessageDialog(

                    i18n.getTranslation("_Message"),

                    this.getMessage()

            );

        } else if( this.isPreviewEnabled()) {

            this.showMessageDialog(

                    i18n.getTranslation("_Preview_value"),

                    this.getPreview()

            );

        }

    }

    protected void showMessageDialog(String title, String msg) {

        final I18nManager i18n = ToolsLocator.getI18nManager();

        final ToolsSwingManager toolsSwingManager = ToolsSwingLocator.getToolsSwingManager();

        JEditorPane textMessage = new JEditorPane();

        JScrollPane scroll = new JScrollPane(textMessage);

        scroll.setPreferredSize(new Dimension(500, 300));

        toolsSwingManager.setDefaultPopupMenu(textMessage);

        textMessage.setContentType("text/html");

        textMessage.setText("<html>"+msg+"</html>");

        textMessage.setCaretPosition(0);

        WindowManager_v2 winmgr = (WindowManager_v2) ToolsSwingLocator.getWindowManager();

        Dialog dialog = winmgr.createDialog(

                scroll,

                title, 

                null,

                WindowManager_v2.BUTTONS_OK

        );

        dialog.show(WindowManager.MODE.DIALOG);        

    }

    protected void setPreview(Object value) {

        this.preview = Objects.toString(value, null);

        this.text.setToolTipText(

                "<html>" + 

                StringUtils.abbreviate(Objects.toString(this.preview,""),100) + 

                "</html>"

        );

        this.menuItemShowPreview.setEnabled(this.isPreviewEnabled());

        this.text.setBackground(color_ok);

    }

    protected void setMessage(int mode, String text) {

        this.message = text;

        if( StringUtils.isBlank(text) ) {

            this.text.setToolTipText("");

            this.menuItemShowMessage.setEnabled(false);

        } else {

            this.text.setToolTipText(

                    "<html>" + 

                    StringUtils.abbreviate(Objects.toString(text,""),100) + 

                    "</html>"

            );

            this.menuItemShowMessage.setEnabled(true);

        }

        switch (mode) {

            case JOptionPane.INFORMATION_MESSAGE:

                this.text.setBackground(color_ok);

                break;

            case JOptionPane.WARNING_MESSAGE:

            case JOptionPane.ERROR_MESSAGE:

            default:

                this.text.setBackground(COLOR_ERROR);

                break;

        }

    }

    protected void setTip(String theTip) {

        this.tip = theTip;

        this.menuItemShowTip.setEnabled(this.isTipEnabled());

    }

    protected abstract Expression getExpression();

}