org.eclipse.osbp.vaaclipse.theme/src/org/eclipse/osbp/vaaclipse/theme/ThemeEngineImpl.java

/*******************************************************************************
 * Copyright (c) 2012 Rushan R. Gilmullin and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     Rushan R. Gilmullin - initial API and implementation
 *******************************************************************************/
 package org.eclipse.osbp.vaaclipse.theme;

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

import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExtension;
import org.eclipse.core.runtime.IExtensionPoint;
import org.eclipse.core.runtime.IExtensionRegistry;
import org.eclipse.core.runtime.RegistryFactory;
import org.eclipse.osbp.vaaclipse.publicapi.theme.Theme;
import org.eclipse.osbp.vaaclipse.publicapi.theme.ThemeContribution;
import org.eclipse.osbp.vaaclipse.publicapi.theme.ThemeEngine;

/**
 * @author rushan
 *
 */
public class ThemeEngineImpl implements ThemeEngine {
	private Map<String, ThemeImpl> themes = new HashMap<String, ThemeImpl>();
	private Map<String, ThemeImpl> themesByWebId = new HashMap<String, ThemeImpl>();
	private Map<String, ThemeContributionImpl> contributionsByWebId = new HashMap<String, ThemeContributionImpl>();

	public void activate() {
		IExtensionRegistry registry = RegistryFactory.getRegistry();
		IExtensionPoint extPoint = registry
				.getExtensionPoint("org.eclipse.osbp.vaaclipse.theme");

		Map<Theme, List<String>> inherited = new HashMap<Theme, List<String>>();
		// add themes
		for (IExtension e : extPoint.getExtensions()) {
			for (IConfigurationElement ce : e.getConfigurationElements()) {
				if (ce.getName().equals("theme")) {
					String themeId = ce.getAttribute("id");
					if (!themes.containsKey(themeId)) {
						String label = ce.getAttribute("label");
						String description = ce.getAttribute("description");

						ThemeImpl theme = new ThemeImpl(themeId, label);
						setupThemeEntry(theme, ce);

						List<String> inheritedList = new ArrayList<String>();
						for (IConfigurationElement inheritedThemeEl : ce
								.getChildren("inheritedTheme")) {
							String refid = inheritedThemeEl
									.getAttribute("refid");
							if (refid != null) {
								inheritedList.add(refid);
							}
						}

						inherited.put(theme, inheritedList);

						theme.setDescription(description);
						themes.put(themeId, theme);
						themesByWebId.put(theme.getWebId(), theme);
					}
				}
			}
		}

		// add inherited themes
		for (ThemeImpl theme : themes.values()) {
			List<String> inheritedThemes = inherited.get(theme);
			for (String inheritedThemeId : inheritedThemes) {
				ThemeImpl inheritedTheme = themes.get(inheritedThemeId);
				if (inheritedTheme != null)
					theme.addInheritedTheme(inheritedTheme);
			}
		}

		// add user contributions
		for (IExtension e : extPoint.getExtensions()) {
			for (IConfigurationElement ce : e.getConfigurationElements()) {
				if (ce.getName().equals("themecontribution")) {
					IConfigurationElement[] cces = ce.getChildren("themeid");
					if (cces.length > 0) {
						String contributionId = ce.getAttribute("id");
						ThemeContributionImpl contribution = new ThemeContributionImpl(
								contributionId);
						setupThemeEntry(contribution, ce);

						String insertPosition = ce
								.getAttribute("insertPosition");
						if (insertPosition != null)
							contribution.setInsertPosition(insertPosition);

						for (int i = 0; i < cces.length; i++) {
							String themeId = cces[i].getAttribute("refid");
							if (themeId != null && themeId.length() > 0) {
								ThemeImpl theme = themes.get(themeId);
								if (theme != null) {
									theme.addContribution(contribution);
								}
							}
						}

						contributionsByWebId.put(contribution.getWebId(),
								contribution);
					}
				}
			}
		}

		for (ThemeImpl theme : themes.values()) {
			try {
				theme.prepareTheme();
			} catch (Exception e1) {
				e1.printStackTrace();
			}
		}
	}

	private void setupThemeEntry(ThemeEntryImpl themeEntry,
			IConfigurationElement ce) {
		String cssUri = ce.getAttribute("cssUri");
		if (cssUri != null) {
			if (!cssUri.startsWith("platform:/plugin/")) {
				cssUri = "platform:/plugin/" + ce.getContributor().getName()
						+ "/" + cssUri;
			}
		}

		themeEntry.setCssUri(cssUri);

		for (IConfigurationElement resourceEl : ce
				.getChildren("resourceLocationUri")) {
			String resourceLocationUri = resourceEl.getAttribute("uri");
			if (resourceLocationUri != null) {
				themeEntry.addResourceUri(resourceLocationUri);
			}
		}
	}

	@Override
	public Theme getTheme(String themeId) {
		return themes.get(themeId);
	}

	@Override
	public Theme getThemeByWebId(String themeWebId) {
		return themesByWebId.get(themeWebId);
	}

	@Override
	public ThemeContribution getThemeContributionByWebId(
			String contributionWebId) {
		return contributionsByWebId.get(contributionWebId);
	}
}