ccw.launching.ClojureElementViewerFilter.java Source code

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Here is the source code for ccw.launching.ClojureElementViewerFilter.java

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/*******************************************************************************
 * Copyright (c) 2009 Laurent PETIT.
 * 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: 
 *    Laurent PETIT - initial API and implementation
 *******************************************************************************/
package ccw.launching;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.IPackageFragmentRoot;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerFilter;

public class ClojureElementViewerFilter extends ViewerFilter {
    private final IProject project;

    public ClojureElementViewerFilter(IProject project) {
        this.project = project;
    }

    @Override
    public boolean select(Viewer viewer, Object parentElement, Object element) {
        IResource resource = (IResource) element;
        IJavaProject javaProject = JavaCore.create(project);

        if (javaProject == null) {
            return true;
        }

        if (contains(project.getFolder("classes"), resource)) {
            return false;
        }

        IPackageFragmentRoot[] froots;
        try {
            froots = javaProject.getAllPackageFragmentRoots();
        } catch (JavaModelException e) {
            return true;
        }

        for (IPackageFragmentRoot froot : froots) {
            IResource frootResource = froot.getResource();
            if (frootResource == null) {
                continue; // Continue to test following fragment roots
            } else if (contains(resource, froot.getResource())) {
                return true;
            } else if (contains(froot.getResource(), resource)) {
                if (resource.getType() == IResource.FILE) {
                    return "clj".equals(((IFile) resource).getFileExtension());
                } else {
                    return true;
                }
            } else {
                continue; // Continue to test following fragment roots
            }
        }
        return false;

    }

    /** 
     * @return true if <code>container</code> contains or is equal 
     *         to <code>containee</code> 
     */
    private boolean contains(IResource container, IResource containee) {
        return container.getFullPath().isPrefixOf(containee.getFullPath());
    }
}