effectsmanager.java

定要上载质量高而定要上载质量高而定要上载质量高而定要上载质量高而定要上载质量高而

/*
 * Created on Mar 15, 2005
 */
package org.flexdock.docking.drag.effects;

import java.awt.Graphics2D;
import java.awt.Polygon;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.flexdock.docking.Dockable;
import org.flexdock.docking.DockingPort;
import org.flexdock.util.OsInfo;
import org.flexdock.util.ResourceManager;
import org.flexdock.util.Utilities;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;

/**
 * 
 * @author Christopher Butler
 */
public class EffectsManager {
    private static final String CONFIG_URI = "org/flexdock/docking/drag/effects/drag-effects.xml";
    private static final Object LOCK = new Object();
    
    private static DragPreview DEFAULT_PREVIEW;
    private static DragPreview CUSTOM_PREVIEW;
    private static RubberBand DEFAULT_RUBBERBAND;
    private static RubberBand CUSTOM_RUBBERBAND;
    
    static {
        prime();
    }
    
    public static void prime() {
        Document config = ResourceManager.getDocument(CONFIG_URI);
        DEFAULT_PREVIEW = loadDefaultPreview(config);
        DEFAULT_RUBBERBAND = loadSystemRubberband(config);
    }
    
    public static RubberBand getRubberBand() {
        synchronized(LOCK) {
            return CUSTOM_RUBBERBAND==null? DEFAULT_RUBBERBAND: CUSTOM_RUBBERBAND;	
        }
    }
    
    public static DragPreview getPreview(Dockable dockable, DockingPort target) {
        synchronized(LOCK) {
            return CUSTOM_PREVIEW==null? DEFAULT_PREVIEW: CUSTOM_PREVIEW;	
        }
    }	
    
    public static RubberBand setRubberBand(String implClass) {
        RubberBand rb = createRubberBand(implClass);
        if(implClass!=null && rb==null)
            return null;
        
        setRubberBand(rb);
        return rb;
    }
    
    public static void setRubberBand(RubberBand rubberBand) {
        synchronized(LOCK) {
            CUSTOM_RUBBERBAND = rubberBand;	
        }		
    }
    
    public DragPreview setPreview(String implClass) {
        DragPreview preview = createPreview(implClass);
        if(implClass!=null && preview==null)
            return null;
        
        setPreview(preview);
        return preview;
    }
    
    public static void setPreview(DragPreview preview) {
        synchronized(LOCK) {
            CUSTOM_PREVIEW = preview;	
        }		
    }
    
    private static final Document loadConfig() {
        return ResourceManager.getDocument(CONFIG_URI);
    }
    
    private static RubberBand createRubberBand(String implClass) {
        boolean failSilent = !Boolean.getBoolean(RubberBand.DEBUG_OUTPUT);
        return (RubberBand)Utilities.createInstance(implClass, RubberBand.class, failSilent);
    }
    
    private static DragPreview createPreview(String implClass) {
        return (DragPreview)Utilities.createInstance(implClass, DragPreview.class);
    }
    
    
    
    private static HashMap loadRubberBandInfoByOS(Document config) {
        HashMap map = new HashMap();
        
        Element root = (Element)config.getElementsByTagName("rubber-bands").item(0);
        map.put("default", root.getAttribute("default"));
        NodeList nodes = root.getElementsByTagName("os");
        
        for(int i=0; i<nodes.getLength(); i++) {
            Element osElem = (Element)nodes.item(i);
            String osName = osElem.getAttribute("name");
            NodeList items = osElem.getElementsByTagName("rubber-band");
            ArrayList classes = new ArrayList(items.getLength());
            map.put(osName, classes);
            for(int j=0; j<items.getLength(); j++) {
                Element classElem = (Element)items.item(j);
                String className = classElem.getAttribute("class");
                classes.add(className);
            }
        }
        return map;
    }
    
    private static RubberBand loadSystemRubberband(Document config) {
        List osList = OsInfo.getInstance().getOsNames();
        HashMap info = loadRubberBandInfoByOS(config);
        
        for(Iterator it=osList.iterator(); it.hasNext();) {
            String osName = (String)it.next();
            List classes = (List)info.get(osName);
            if(classes==null)
                continue;
            
            for(Iterator it2=classes.iterator(); it2.hasNext();) {
                String implClass = (String)it2.next();
                RubberBand rb = createRubberBand(implClass);
                if(rb!=null)
                    return rb;
            }
        }
        
        String implClass = (String)info.get("default");
        RubberBand rb = createRubberBand(implClass);
        return rb==null? new RubberBand(): rb;
    }
    
    private static DragPreview loadDefaultPreview(Document config) {
        Element root = (Element)config.getElementsByTagName("drag-previews").item(0);
        String previewClass = root.getAttribute("default");
        DragPreview preview = createPreview(previewClass);
        if(preview!=null)
            return preview;
        // unable to load the preview class.  return a no-op preview delegate instead.
        return new DefaultPreview() {
            public void drawPreview(Graphics2D g, Polygon poly, Dockable dockable, Map dragInfo) {
                // noop
            }
        };
    }
    
}