com.safi.workshop.sqlexplorer.sqleditor.AbstractSQLScanner.java Source code

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Here is the source code for com.safi.workshop.sqlexplorer.sqleditor.AbstractSQLScanner.java

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package com.safi.workshop.sqlexplorer.sqleditor;

/*
 * Copyright (C) 2002-2004 Andrea Mazzolini
 * andreamazzolini@users.sourceforge.net
 *
 * This program 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
 */

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.jface.preference.PreferenceConverter;
import org.eclipse.jface.resource.StringConverter;
import org.eclipse.jface.text.TextAttribute;
import org.eclipse.jface.text.rules.BufferedRuleBasedScanner;
import org.eclipse.jface.text.rules.IRule;
import org.eclipse.jface.text.rules.Token;
import org.eclipse.jface.util.PropertyChangeEvent;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.RGB;

public abstract class AbstractSQLScanner extends BufferedRuleBasedScanner {

    private IColorManager fColorManager;
    private IPreferenceStore fPreferenceStore;

    private Map fTokenMap = new HashMap();
    private String[] fPropertyNamesColor;
    private String[] fPropertyNamesStyle;

    /**
     * Returns the list of preference keys which define the tokens used in the rules of this
     * scanner.
     */
    abstract protected String[] getTokenProperties();

    /**
     * Creates the list of rules controlling this scanner.
     */
    abstract protected List createRules();

    /**
     * Creates an abstract Java scanner.
     */
    public AbstractSQLScanner(IColorManager manager, IPreferenceStore store) {
        super();
        fColorManager = manager;
        fPreferenceStore = store;
    }

    /**
     * Must be called after the constructor has been called.
     */
    public final void initialize() {

        fPropertyNamesColor = getTokenProperties();
        int length = fPropertyNamesColor.length;
        fPropertyNamesStyle = new String[length];
        for (int i = 0; i < length; i++) {
            fPropertyNamesStyle[i] = fPropertyNamesColor[i] + "_bold"; //$NON-NLS-1$
            addToken(fPropertyNamesColor[i], fPropertyNamesStyle[i]);
        }

        initializeRules();
    }

    private void addToken(String colorKey, String styleKey) {
        // System.out.println("AddToken "+colorKey+" "+styleKey);
        RGB rgb = PreferenceConverter.getColor(fPreferenceStore, colorKey);
        if (fColorManager instanceof IColorManagerExtension) {
            IColorManagerExtension ext = (IColorManagerExtension) fColorManager;
            ext.unbindColor(colorKey);
            ext.bindColor(colorKey, rgb);
        }

        boolean bold = fPreferenceStore.getBoolean(styleKey);
        fTokenMap.put(colorKey,
                new Token(new TextAttribute(fColorManager.getColor(colorKey), null, bold ? SWT.BOLD : SWT.NORMAL)));
    }

    protected Token getToken(String key) {
        return (Token) fTokenMap.get(key);
    }

    private void initializeRules() {
        List rules = createRules();
        if (rules != null) {
            IRule[] result = new IRule[rules.size()];
            rules.toArray(result);
            setRules(result);
        }
    }

    private int indexOf(String property) {
        if (property != null) {
            int length = fPropertyNamesColor.length;
            for (int i = 0; i < length; i++) {
                if (property.equals(fPropertyNamesColor[i]) || property.equals(fPropertyNamesStyle[i]))
                    return i;
            }
        }
        return -1;
    }

    public boolean affectsBehavior(PropertyChangeEvent event) {
        return indexOf(event.getProperty()) >= 0;
    }

    public void adaptToPreferenceChange(PropertyChangeEvent event) {
        String p = event.getProperty();
        int index = indexOf(p);
        Token token = getToken(fPropertyNamesColor[index]);
        if (fPropertyNamesColor[index].equals(p))
            adaptToColorChange(token, event);
        else
            adaptToStyleChange(token, event);
    }

    private void adaptToColorChange(Token token, PropertyChangeEvent event) {
        RGB rgb = null;

        Object value = event.getNewValue();
        if (value instanceof RGB)
            rgb = (RGB) value;
        else if (value instanceof String)
            rgb = StringConverter.asRGB((String) value);

        if (rgb != null) {

            String property = event.getProperty();

            if (fColorManager instanceof IColorManagerExtension) {
                IColorManagerExtension ext = (IColorManagerExtension) fColorManager;
                ext.unbindColor(property);
                ext.bindColor(property, rgb);
            }

            Object data = token.getData();
            if (data instanceof TextAttribute) {
                TextAttribute oldAttr = (TextAttribute) data;
                token.setData(new TextAttribute(fColorManager.getColor(property), oldAttr.getBackground(),
                        oldAttr.getStyle()));
            }
        }
    }

    private void adaptToStyleChange(Token token, PropertyChangeEvent event) {
        boolean bold = false;
        Object value = event.getNewValue();
        if (value instanceof Boolean)
            bold = ((Boolean) value).booleanValue();
        else if (value instanceof String) {
            String s = (String) value;
            if (IPreferenceStore.TRUE.equals(s))
                bold = true;
            else if (IPreferenceStore.FALSE.equals(s))
                bold = false;
        }

        Object data = token.getData();
        if (data instanceof TextAttribute) {
            TextAttribute oldAttr = (TextAttribute) data;
            boolean isBold = (oldAttr.getStyle() == SWT.BOLD);
            if (isBold != bold)
                token.setData(new TextAttribute(oldAttr.getForeground(), oldAttr.getBackground(),
                        bold ? SWT.BOLD : SWT.NORMAL));
        }
    }
}