Java tutorial
/* Copyright (C) 2006 Christian Schneider * * This file is part of Nomad. * * Nomad is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * Nomad 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with Nomad; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ package net.sf.nmedit.jtheme.store2; import java.awt.Image; import java.io.IOException; import java.io.Serializable; import java.io.StringWriter; import javax.swing.ImageIcon; import javax.xml.transform.Transformer; import javax.xml.transform.TransformerConfigurationException; import javax.xml.transform.TransformerException; import javax.xml.transform.TransformerFactory; import javax.xml.transform.stream.StreamResult; import net.sf.nmedit.jpatch.PModule; import net.sf.nmedit.jpatch.PModuleDescriptor; import net.sf.nmedit.jtheme.JTContext; import net.sf.nmedit.jtheme.JTException; import net.sf.nmedit.jtheme.component.JTComponent; import net.sf.nmedit.jtheme.component.JTImage; import net.sf.nmedit.jtheme.image.AbstractImageResource; import net.sf.nmedit.jtheme.image.ImageResource; import net.sf.nmedit.jtheme.image.SVGImageResource; import net.sf.nmedit.jtheme.image.SVGStringRessource; import net.sf.nmedit.jtheme.image.ToolkitImageResource; import net.sf.nmedit.jtheme.store.DefaultStorageContext; import net.sf.nmedit.jtheme.store.StorageContext; import net.sf.nmedit.nmutils.graphics.GraphicsToolkit; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.jdom.Attribute; import org.jdom.Element; import org.jdom.Namespace; import org.jdom.transform.JDOMSource; public class ImageElement extends AbstractElement implements Serializable { /** * */ private static final long serialVersionUID = 1462274961082257283L; private String src; private String id; private transient ImageResource imageResource; // TODO serialization protected boolean reducible = false; private static Log getLogger() { return LogFactory.getLog(ImageElement.class); } public void initializeElement(StorageContext context) { if (id != null) { imageResource = context.getCachedImage(id); } } public static ImageResource getImageResource(StorageContext context, Element element) { String href = getXlinkHref(element); if (href == null) return null; ImageResource ir; if (href.endsWith("svg")) ir = new SVGImageResource(href, context.getContextClassLoader()); else ir = new ToolkitImageResource(href, context.getContextClassLoader()); ir.setImageCache(context.getImageCache()); return ir; } private static final String SVG_NS = "http://www.w3.org/2000/svg"; private transient Namespace cachedSvgNameSpace; private Namespace svgns() { if (cachedSvgNameSpace == null) cachedSvgNameSpace = Namespace.getNamespace(SVG_NS); return cachedSvgNameSpace; } private static final String XLINK_NS = "http://www.w3.org/1999/xlink"; private static Namespace xlinkns = Namespace.getNamespace(XLINK_NS); public static String getXlinkHref(Element e) { return e.getAttributeValue("href", xlinkns); } public void renderImage(StorageContext context) { render(); } private Image render() { if (imageResource == null) return null; Image image = imageResource.getImage(width, height); if (image == null) { Log log = LogFactory.getLog(getClass()); if (log.isWarnEnabled()) log.warn("Could not open image [width=" + width + ",height=" + height + "] from:" + imageResource); return null; } return image; } @Override public JTComponent createComponent(JTContext context, PModuleDescriptor descriptor, PModule module) throws JTException { Image image = render(); if (image == null) return null; JTImage jtimg = (JTImage) context.createComponent(JTContext.TYPE_IMAGE); setName(jtimg); this.reducible = jtimg.isReducible(); jtimg.setIcon(new ImageIcon(image)); setLocation(jtimg); if (width >= 0 && height >= 0) { setSize(jtimg); } else { jtimg.setSize(GraphicsToolkit.getImageSize(image)); } return jtimg; } @Override public boolean isReducible() { return reducible; } public static AbstractElement createElement(StorageContext context, Element element) { ImageElement e = new ImageElement(); e.initElement(context, element); e.lookupImage(context, element); return e; } private AbstractImageResource createResource(StorageContext context, String src) { AbstractImageResource ir; if (src.endsWith(".svg")) ir = new SVGImageResource(src, context.getContextClassLoader()); else ir = new ToolkitImageResource(src, context.getContextClassLoader()); ir.setImageCache(context.getImageCache()); return ir; } @Override protected void initAttributes(StorageContext context, Attribute att) { if ("href".equals(att.getName()) && xlinkns.equals(att.getNamespace())) { src = att.getValue(); } else { super.initAttributes(context, att); } } protected void lookupImage(StorageContext context, Element e) { if (imageResource != null) return; if (src != null) { if (context instanceof DefaultStorageContext) { DefaultStorageContext dsc = (DefaultStorageContext) context; imageResource = dsc.getCachedImage(src); if (src.startsWith("url(#") && src.endsWith(")")) { String id = src.substring(5, src.length() - 1); imageResource = dsc.getImageResourceById(id); this.id = id; } else if (imageResource == null) { AbstractImageResource air = createResource(context, src); imageResource = air; imageResource.setImageCache(context.getImageCache()); this.id = air.getResolvedURL().toString(); dsc.putImage(id, air); } } else { imageResource = createResource(context, src); } } else { Element svg = e.getChild("svg", svgns()); if (svg != null) { imageResource = new SVGStringRessource(element2txt(svg)); imageResource.setImageCache(context.getImageCache()); if (context instanceof DefaultStorageContext) { DefaultStorageContext dsc = (DefaultStorageContext) context; this.id = context.generateId(); dsc.putImage(id, imageResource); } } } } public static Image getImage(String href, StorageContext context) { if (href.startsWith("url(#") && href.endsWith(")")) { if (context instanceof DefaultStorageContext) { DefaultStorageContext c = (DefaultStorageContext) context; String id = href.substring(5, href.length() - 1); ImageResource ir = c.getImageResourceById(id); return ir == null ? null : ir.getImage(-1, -1); } return null; } else return context.getImage(href); } public static ImageResource svgElement2img(Element element) { String svg = element2txt(element); if (svg == null) return null; return new SVGStringRessource(svg); } public static String element2txt(Element el) { TransformerFactory tf = TransformerFactory.newInstance(); // set all necessary features for your transformer -> see OutputKeys Transformer t; try { t = tf.newTransformer(); } catch (TransformerConfigurationException e) { return null; } StringWriter sw = new StringWriter(); try { t.transform(new JDOMSource(el), new StreamResult(sw)); } catch (TransformerException e) { Log log = getLogger(); if (log.isWarnEnabled()) { log.warn("element2txt failed", e); } return null; } return sw.toString(); } private void writeObject(java.io.ObjectOutputStream out) throws IOException { out.defaultWriteObject(); } private void readObject(java.io.ObjectInputStream in) throws IOException, ClassNotFoundException { in.defaultReadObject(); } }