com.kdmanalytics.toif.ui.common.ResourceChangeMonitor.java Source code

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Here is the source code for com.kdmanalytics.toif.ui.common.ResourceChangeMonitor.java

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/*******************************************************************************
 * Copyright (c) 2016 KDM Analytics, Inc. All rights reserved. This program and
 * the accompanying materials are made available under the terms of the Open
 * Source Initiative OSI - Open Software License v3.0 which accompanies this
 * distribution, and is available at
 * http://www.opensource.org/licenses/osl-3.0.php/
 ******************************************************************************/

package com.kdmanalytics.toif.ui.common;

import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

import org.eclipse.core.resources.IContainer;
import org.eclipse.core.resources.IFile;
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.IResourceDeltaVisitor;
import org.eclipse.core.resources.IWorkspace;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.QualifiedName;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.ui.ISelectionListener;
import org.eclipse.ui.ISelectionService;
import org.eclipse.ui.IStartup;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.PlatformUI;

/**
 * This class monitors for changes in resources to provide appropriate warnings when in "Import"
 * mode.
 * 
 * @author Ken Duck
 *        
 */
public class ResourceChangeMonitor implements IStartup, IResourceChangeListener, ISelectionListener {

    /**
     * Track all cited resources that are currently selected
     */
    private Set<IFile> citedResource = new HashSet<IFile>();

    /*
     * (non-Javadoc)
     * 
     * @see org.eclipse.ui.IStartup#earlyStartup()
     */
    @Override
    public void earlyStartup() {
        IWorkspace workspace = ResourcesPlugin.getWorkspace();
        workspace.addResourceChangeListener(this, IResourceChangeEvent.POST_CHANGE);

        final ResourceChangeMonitor monitor = this;
        PlatformUI.getWorkbench().getDisplay().asyncExec(new Runnable() {

            public void run() {
                IWorkbenchWindow window = PlatformUI.getWorkbench().getActiveWorkbenchWindow();
                ISelectionService service = window.getSelectionService();
                service.addSelectionListener(monitor);
            }
        });

    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * org.eclipse.core.resources.IResourceChangeListener#resourceChanged(org.eclipse.core.resources.
     * IResourceChangeEvent)
     */
    @Override
    public void resourceChanged(IResourceChangeEvent event) {
        switch (event.getType()) {
        case IResourceChangeEvent.POST_CHANGE: {
            try {
                event.getDelta().accept(getDeltaPrinter(citedResource));
            } catch (CoreException e) {
                e.printStackTrace();
            }
            break;
        }
        }
    }

    /**
     * 
     * @param citedResource
     * @return
     */
    protected IResourceDeltaVisitor getDeltaPrinter(Set<IFile> citedResource) {
        return new ResourceChangeDeltaPrinter(citedResource);
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.eclipse.ui.ISelectionListener#selectionChanged(org.eclipse.ui.IWorkbenchPart,
     * org.eclipse.jface.viewers.ISelection)
     */
    @Override
    public void selectionChanged(IWorkbenchPart part, ISelection selection) {
        if (selection instanceof IStructuredSelection) {
            IStructuredSelection sel = (IStructuredSelection) selection;
            for (Iterator<?> it = sel.iterator(); it.hasNext();) {
                Object o = it.next();
                if (o instanceof IResource) {
                    setSelectedCitedResources((IResource) o);
                }
            }
        }
    }

    /**
     * 
     * @param resource
     */
    private void setSelectedCitedResources(IResource resource) {
        citedResource.clear();

        // Only works with open projects
        if (resource instanceof IProject) {
            if (!((IProject) resource).isOpen()) {
                return;
            }
        }
        try {
            if (resource instanceof IFile) {
                Map<QualifiedName, String> props = resource.getPersistentProperties();
                for (Map.Entry<QualifiedName, String> entry : props.entrySet()) {
                    String key = entry.getKey().toString();
                    if (key.startsWith(Activator.PLUGIN_ID) && key.endsWith(":citing")) {
                        citedResource.add((IFile) resource);
                    }
                }
            }
            if (resource instanceof IContainer) {
                IResource[] children = ((IContainer) resource).members();
                if (children != null) {
                    for (IResource child : children) {
                        setSelectedCitedResources(child);
                    }
                }
            }
        } catch (CoreException e) {
            e.printStackTrace();
        }
    }

}