icongrouploader.java~2~

具有不同语法高亮的编辑器实例

/*
 * IconGroupLoader.java - Loads icon groups from an XML file.
 */
package org.fife.rtext;

import java.io.FileInputStream;
import java.util.HashMap;
import java.util.Map;

import javax.xml.parsers.*;
import javax.xml.transform.*;
import javax.xml.transform.dom.*;
import javax.xml.transform.stream.*;
import org.w3c.dom.*;
import org.xml.sax.InputSource;

import org.fife.io.UnicodeReader;
import org.fife.ui.rtextarea.IconGroup;


/**
 * A class that knows how to parse an XML file defining icon groups.  RText
 * uses this class to define its available icon groups.
 *
 * @author Robert Futrell
 * @version 0.6
 */
class IconGroupLoader {

	public static final String DEFAULT_ICON_GROUP_NAME = "Office 2003 Icons";

	private RText owner;
	private HashMap iconGroupMap;

	// Constants to use when specifying icon styles.
	private static final String WINDOWS_98_ICONS		= "Windows 98 Icons";
	private static final String OFFICE_2003_ICONS	= "Office 2003 Icons";

	public static final IconGroup WIN98_ICON_GROUP      = new IconGroup(WINDOWS_98_ICONS, "org/fife/plaf/OfficeXP/images/");
	public static final IconGroup OFFICE2003_ICON_GROUP = new IconGroup(OFFICE_2003_ICONS, "org/fife/plaf/Office2003/images/");

	private static final String ROOT_ELEMENT		= "IconGroups";
	private static final String GROUP				= "group";
	private static final String NAME				= "name";
	private static final String PATH				= "path";
	private static final String LARGEICONSUBDIR		= "largeIconSubDir";
	private static final String EXTENSION			= "extension";
	private static final String JAR				= "jar";


/*****************************************************************************/


	/**
	 * Constructor.
	 *
	 * @param owner The RText instance.
	 */
	private IconGroupLoader(RText owner) {
		this.owner = owner;
		iconGroupMap = new HashMap(3);
	}


/*****************************************************************************/


	/**
	 * Reads all icon groups from the specified XML file.
	 *
	 * @param iconGroupFile The file from which to read.
	 * @return A map of icon groups.  The key to each icon group is that
	 *         icon group's name.  If no icon groups are available (which is
	 *         an error), an empty map is returned.
	 */
	private Map doLoad(String iconGroupFile) {

		DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
		DocumentBuilder db = null;
		Document doc = null;
		try {
			db = dbf.newDocumentBuilder();
			InputSource is = new InputSource(new UnicodeReader(
						new FileInputStream(iconGroupFile), "UTF-8"));
			is.setEncoding("UTF-8");
			doc = db.parse(is);//db.parse(file);
		} catch (Exception e) {
			e.printStackTrace();
			owner.displayException(e);
			return iconGroupMap; // Will be empty.
		}

		// Traverse the XML tree.
		initializeFromXMLFile(doc);

		// Add default icon groups.
		iconGroupMap.put(WIN98_ICON_GROUP.getName(), WIN98_ICON_GROUP);
		iconGroupMap.put(OFFICE2003_ICON_GROUP.getName(),
											OFFICE2003_ICON_GROUP);

		return iconGroupMap;

	}


/*****************************************************************************/


	/**
	 * Parses the XML document containing icon group definitions, adding them
	 * to this icon group loader's icon group map.
	 *
	 * @param node The root node of the parsed XML document.
	 * @return <code>true</code> if the initialization went okay;
	 *         <code>false</code> if an error occured.
	 */
	private boolean initializeFromXMLFile(Node node) {

		if (node==null)
			return false;

		int type = node.getNodeType();
		switch (type) {

			// Handle document nodes.
			case Node.DOCUMENT_NODE:
				boolean rc = initializeFromXMLFile(
							((Document)node).getDocumentElement());
				if (rc==false)
					return false;
				break;

			// Handle element nodes.
			case Node.ELEMENT_NODE:

				String nodeName = node.getNodeName();

				if (nodeName.equals(ROOT_ELEMENT)) {
					NodeList childNodes = node.getChildNodes();
					int childCount = childNodes==null ? 0 :
										childNodes.getLength();
					for (int i=0; i<childCount; i++) {
						rc = initializeFromXMLFile(childNodes.item(i));
						// Just because one icon group is specified
						// with invalid XML doesn't mean they all are.
						//if (rc==false)
						//	return false;
					}
				}

				else if (nodeName.equals(GROUP)) {
					NamedNodeMap attributes = node.getAttributes();
					if (attributes==null)
						return false;
					String name = null;
					String path = ""; // Default to an empty path.
					String largeIconSubDir = null;
					String extension = null;
					String jar = null;
					int count = attributes.getLength();
					for (int i=0; i<count; i++) {
						Node node2 = attributes.item(i);
						nodeName = node2.getNodeName();
						String nodeValue = node2.getNodeValue();
						if (nodeName.equals(NAME))
							name = nodeValue;
						else if (nodeName.equals(PATH))
							path = nodeValue;
						else if (nodeName.equals(LARGEICONSUBDIR))
							largeIconSubDir = nodeValue;
						else if (nodeName.equals(EXTENSION))
							extension = nodeValue;
						else if (nodeName.equals(JAR))
							jar = owner.getInstallLocation() +
									"/" + nodeValue;
					}
					if (name==null)
						return false;
					IconGroup group = new IconGroup(name, path,
									largeIconSubDir, extension, jar);
					iconGroupMap.put(group.getName(), group);
				}

				break;

			// Whitespace nodes.
			case Node.TEXT_NODE:
				break;

			// An error occured?
			default:
				System.err.println("... ERROR!!!");
				return false;

		}

		// Everything went okay.
		return true;

	}


/*****************************************************************************/


	/**
	 * Reads all icon groups from the specified XML file and returns a map
	 * of them.
	 *
	 * @param RText The RText instance.
	 * @param iconGroupFile The file from which to read.
	 * @return A map of icon groups.  The key to each icon group is that
	 *         icon group's name.
	 */
	public static Map loadIconGroups(RText rtext, String iconGroupFile) {
		IconGroupLoader loader = new IconGroupLoader(rtext);
		return loader.doLoad(iconGroupFile);
	}


/*****************************************************************************/

}