WOTagLibResourceChangeListener.java

/*
 * ====================================================================
 * 
 * The ObjectStyle Group Software License, Version 1.0
 * 
 * Copyright (c) 2007 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.
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 * 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.
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 * 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" nor
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package org.objectstyle.wolips.jdt.ui.tags;

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.resources.IResourceDelta;
import org.eclipse.core.resources.IResourceDeltaVisitor;
import org.eclipse.core.runtime.CoreException;
import org.objectstyle.wolips.core.resources.types.project.ProjectAdapter;
import org.objectstyle.wolips.jdt.JdtPlugin;

/**
 * Tracking changes in resources and synchronizes webobjects project file
 */
public abstract class WOTagLibResourceChangeListener implements IResourceChangeListener, IResourceDeltaVisitor {

	/**
	 * Constructor for ResourceChangeListener.
	 */
	public WOTagLibResourceChangeListener() {
		super();
	}

	public final void resourceChanged(IResourceChangeEvent event) {
		try {
			event.getDelta().accept(this);
		} catch (CoreException e) {
			JdtPlugin.getDefault().getPluginLogger().log(e);
		}
	}
	
	public final boolean visit(IResourceDelta delta) throws CoreException {
		IResource resource = delta.getResource();
		return examineResource(resource, delta.getKind());
	}

	private final boolean examineResource(IResource resource, int kindOfChange) {
		if (!resource.isAccessible() && kindOfChange != IResourceDelta.REMOVED)
			return false;
		if (resource.isDerived())
			return false;
		switch (resource.getType()) {
		case IResource.ROOT:
			// further investigation of resource delta needed
			return true;
		case IResource.PROJECT:
			ProjectAdapter project = (ProjectAdapter) resource.getAdapter(ProjectAdapter.class);
			if (project == null) {
				return false;
			}
			if (project.isApplication() || project.isFramework()) {
				return true;
			} // no webobjects project
			return false;
		case IResource.FOLDER:
			return false;
		case IResource.FILE:
			if (resource.getName().equals(TagLib.FILENAME)) {
				this.update(resource.getProject());
			}
		}
		return false;
	}

	public abstract void update(IProject project);

}