ComponentLocateCache.java

/* ====================================================================
 *
 * The ObjectStyle Group Software License, Version 1.0
 *
 * Copyright (c) 2006 The ObjectStyle Group,
 * and individual authors of the software.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        ObjectStyle Group (http://objectstyle.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
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 * 4. The names "ObjectStyle Group" and "Cayenne"
 *    must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact andrus@objectstyle.org.
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 * 5. Products derived from this software may not be called "ObjectStyle"
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 *
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 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the ObjectStyle Group.  For more
 * information on the ObjectStyle Group, please see
 * <http://objectstyle.org/>.
 *
 */
package org.objectstyle.wolips.locate.cache;

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

import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IResourceChangeEvent;
import org.eclipse.core.resources.IResourceChangeListener;
import org.eclipse.core.runtime.CoreException;
import org.objectstyle.wolips.locate.LocatePlugin;
import org.objectstyle.wolips.locate.result.LocalizedComponentsLocateResult;

public class ComponentLocateCache implements IResourceChangeListener {
	private Map<String, Map<String, LocalizedComponentsLocateResult>> projects = new HashMap<String, Map<String, LocalizedComponentsLocateResult>>();

	public ComponentLocateCache() {
		super();
	}

	public void forgetCacheForProject(IProject project) {
		String projectKey = project.getName();
		projects.remove(projectKey);
	}

	public void forgetCacheForFile(IResource resource) {
		Map<String, LocalizedComponentsLocateResult> projectHashMap = this.project(resource.getProject());
		if (projectHashMap == null) {
			return;
		}
		String key = LocatePlugin.getDefault().fileNameWithoutExtension(resource);
		projectHashMap.remove(key);
	}

	public LocalizedComponentsLocateResult getLocalizedComponentsLocateResult(IResource resource) {
		Map<String, LocalizedComponentsLocateResult> projectHashMap = this.project(resource.getProject());
		if (projectHashMap == null) {
			return null;
		}
		String key = LocatePlugin.getDefault().fileNameWithoutExtension(resource);
		LocalizedComponentsLocateResult localizedComponentsLocateResult = projectHashMap.get(key);
		return localizedComponentsLocateResult;
	}

	public LocalizedComponentsLocateResult getLocalizedComponentsLocateResult(IProject project, String filenameWithoutExtension) {
		Map<String, LocalizedComponentsLocateResult> projectHashMap = this.project(project);
		if (projectHashMap == null) {
			return null;
		}
		String key = LocatePlugin.getDefault().fileNameWithoutExtension(filenameWithoutExtension);
		LocalizedComponentsLocateResult localizedComponentsLocateResult = projectHashMap.get(key);
		return localizedComponentsLocateResult;
	}

	public void addToCache(IResource resource, LocalizedComponentsLocateResult localizedComponentsLocateResult) {
		addToCache(resource.getProject(), LocatePlugin.getDefault().fileNameWithoutExtension(resource), localizedComponentsLocateResult);
	}

	public void addToCache(IProject project, String filenameWithoutExtension, LocalizedComponentsLocateResult localizedComponentsLocateResult) {
		Map<String, LocalizedComponentsLocateResult> projectHashMap = this.project(project);
		if (projectHashMap == null) {
			projectHashMap = new HashMap<String, LocalizedComponentsLocateResult>();
			String projectsKey = project.getName();
			projects.put(projectsKey, projectHashMap);
		}
		projectHashMap.put(filenameWithoutExtension, localizedComponentsLocateResult);
	}

	private Map<String, LocalizedComponentsLocateResult> project(IProject project) {
		Map<String, LocalizedComponentsLocateResult> projectHashMap = projects.get(project.getName());
		return projectHashMap;
	}

	public void resourceChanged(IResourceChangeEvent event) {
		if (event.getDelta() != null && event.getType() == IResourceChangeEvent.PRE_CLOSE) {
			try {
				event.getDelta().accept(new PreCloseVisitor(this));
			} catch (CoreException e) {
				LocatePlugin.getDefault().log(e);
				projects = new HashMap<String, Map<String, LocalizedComponentsLocateResult>>();
			}
		}

		if (event.getDelta() != null && event.getType() == IResourceChangeEvent.POST_CHANGE) {
			try {
				event.getDelta().accept(new PreDeleteVisitor(this));
			} catch (CoreException e) {
				LocatePlugin.getDefault().log(e);
				projects = new HashMap<String, Map<String, LocalizedComponentsLocateResult>>();
			}
		}
	}
}