de.rowlo.diffeclipse.folderscanner.EclipseFolderScannerForTree.java Source code

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Here is the source code for de.rowlo.diffeclipse.folderscanner.EclipseFolderScannerForTree.java

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/*******************************************************************************
 * Copyright (c) 2011 Robert Wloch 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:
 *     Robert Wloch - initial API and implementation
 *******************************************************************************/
package de.rowlo.diffeclipse.folderscanner;

import java.io.File;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.concurrent.atomic.AtomicBoolean;

import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Tree;

import de.rowlo.diffeclipse.model.tree.TreeModel;
import de.rowlo.diffeclipse.util.io.EclipseProductFileFilter;

/**
 * 
 * @author Robert Wloch (robert@rowlo.de)
 */
public class EclipseFolderScannerForTree extends Thread {
    private final AtomicBoolean shouldQuit = new AtomicBoolean();
    private Set<String> eclipseFiles = null;
    private String pathToEclipse = null;
    private final EclipseFolderScannerCaller scannerCaller;
    private final List<EclipseFolderScannerFilter> eclipseFolderScannerFilters = new ArrayList<EclipseFolderScannerFilter>();

    public EclipseFolderScannerForTree(final EclipseFolderScannerCaller textLocationEclipseHandler) {
        this.scannerCaller = textLocationEclipseHandler;
    }

    protected EclipseFolderScannerCaller getScannerCaller() {
        return scannerCaller;
    }

    protected String getPathToEclipse() {
        return pathToEclipse;
    }

    public void addEclipseFolderScannerFilter(EclipseFolderScannerFilter filter) {
        if (filter != null && !eclipseFolderScannerFilters.contains(filter)) {
            eclipseFolderScannerFilters.add(filter);
        }
    }

    public void removeEclipseFolderScannerFilter(EclipseFolderScannerFilter filter) {
        if (filter != null && eclipseFolderScannerFilters.contains(filter)) {
            eclipseFolderScannerFilters.remove(filter);
        }
    }

    public void quit() {
        shouldQuit.set(true);
    }

    @Override
    public void run() {
        shouldQuit.set(false);
        if (getScannerCaller() == null) {
            return;
        }
        Display display = getScannerCaller().getTreeViewer().getTree().getDisplay();
        display.syncExec(new Runnable() {
            @Override
            public void run() {
                eclipseFiles = new HashSet<String>();
                pathToEclipse = getScannerCaller().getLocation();
                File file = new File(pathToEclipse);
                if (file != null && file.isDirectory()) {
                    EclipseProductFileFilter filter = EclipseProductFileFilter.INSTANCE;
                    File[] essentialFiles = file.listFiles(filter);
                    boolean isEclipseProduct = filter.isEclipseProduct(essentialFiles);
                    if (isEclipseProduct && !shouldQuit.get()) {
                        scanEclipseProductFolder(file);
                    }
                }
                getScannerCaller().notifyListeners(pathToEclipse, eclipseFiles);
            }

        });
        getScannerCaller().folderScannerFinished();
    }

    protected void scanEclipseProductFolder(File file) {
        TreeModel root = TreeModel.createRoot();

        if (!shouldQuit.get()) {
            makeTreeModel(file, root);
        }

        if (!shouldQuit.get()) {
            updateTreeViewerInput(root);
        }
    }

    protected void makeTreeModel(File parent, TreeModel parentModel) {
        File[] children = parent.listFiles();
        if (shouldQuit.get() || children == null) {
            return;
        }
        for (File child : children) {
            if (shouldQuit.get()) {
                return;
            }
            TreeModel childModel = createTreeModelForFile(child, parentModel);
            if (childModel != null) {
                parentModel.children.add(childModel);
                if (!childModel.isFile()) {
                    makeTreeModel(child, childModel);
                }
            }
        }
    }

    protected TreeModel createTreeModelForFile(final File file, final TreeModel parent) {
        TreeModel result = null;
        if (file != null && file.exists()) {
            String name = file.getName();
            String filePath = file.getAbsolutePath();
            if (getPathToEclipse() != null) {
                String trimmedFilePath = filePath.substring(getPathToEclipse().length());
                eclipseFiles.add(trimmedFilePath);
            }
            boolean isFile = file.isFile();
            result = createTreeModel(name, filePath, isFile, parent);
        }
        result = applyFilter(result);
        return result;
    }

    protected TreeModel createTreeModel(String name, String filePath, boolean isFile, TreeModel parent) {
        return new TreeModel(name, filePath, isFile, parent);
    }

    protected TreeModel applyFilter(final TreeModel subject) {
        List<EclipseFolderScannerFilter> filters = new ArrayList<EclipseFolderScannerFilter>(
                eclipseFolderScannerFilters);
        for (EclipseFolderScannerFilter filter : filters) {
            if (!filter.apply(subject)) {
                return null;
            }
        }
        return subject;
    }

    protected void updateTreeViewerInput(final TreeModel input) {
        final TreeViewer treeViewer = scannerCaller.getTreeViewer();
        Tree tree = treeViewer.getTree();
        Shell shell = tree.getShell();
        Display display = shell.getDisplay();
        if (shouldQuit.get()) {
            return;
        }
        display.syncExec(new Runnable() {
            @Override
            public void run() {
                treeViewer.setInput(input);
            }
        });
    }
}