com.liferay.ide.ui.wizard.ExternalFileSelectionDialog.java Source code

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Here is the source code for com.liferay.ide.ui.wizard.ExternalFileSelectionDialog.java

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/*******************************************************************************
 * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 *
 *******************************************************************************/

package com.liferay.ide.ui.wizard;

import java.io.File;

import org.eclipse.core.runtime.IStatus;
import org.eclipse.jdt.internal.ui.dialogs.StatusInfo;
import org.eclipse.jdt.internal.ui.viewsupport.BasicElementLabels;
import org.eclipse.jdt.internal.ui.viewsupport.FilteredElementTreeSelectionDialog;
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerComparator;
import org.eclipse.jface.viewers.ViewerFilter;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.ISharedImages;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.dialogs.ISelectionStatusValidator;

/**
 * @author Greg Amerson
 */
@SuppressWarnings("restriction")
public class ExternalFileSelectionDialog extends FilteredElementTreeSelectionDialog {

    protected static class FileContentProvider implements ITreeContentProvider {
        private final Object[] EMPTY = new Object[0];

        public void dispose() {
        }

        public Object[] getChildren(Object parentElement) {
            if (parentElement instanceof File) {
                File[] children = ((File) parentElement).listFiles();

                if (children != null) {
                    return children;
                }
            }

            return EMPTY;
        }

        public Object[] getElements(Object element) {
            return getChildren(element);
        }

        public Object getParent(Object element) {
            if (element instanceof File) {
                return ((File) element).getParentFile();
            }

            return null;
        }

        public boolean hasChildren(Object element) {
            return getChildren(element).length > 0;
        }

        public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
        }

    }

    protected static class FileLabelProvider extends LabelProvider {
        private final Image IMG_FILE = PlatformUI.getWorkbench().getSharedImages()
                .getImage(ISharedImages.IMG_OBJ_FILE);

        private final Image IMG_FOLDER = PlatformUI.getWorkbench().getSharedImages()
                .getImage(ISharedImages.IMG_OBJ_FOLDER);

        public Image getImage(Object element) {
            if (element instanceof File) {
                File curr = (File) element;

                if (curr.isDirectory()) {
                    return IMG_FOLDER;
                } else {
                    return IMG_FILE;
                }
            }

            return null;
        }

        public String getText(Object element) {
            if (element instanceof File) {
                return BasicElementLabels.getResourceName(((File) element).getName());
            }

            return super.getText(element);
        }
    }

    protected static class FileSelectionValidator implements ISelectionStatusValidator {
        protected boolean fAcceptFolders;
        protected boolean fMultiSelect;

        public FileSelectionValidator(boolean multiSelect, boolean acceptFolders) {
            fMultiSelect = multiSelect;
            fAcceptFolders = acceptFolders;
        }

        public IStatus validate(Object[] selection) {
            int nSelected = selection.length;

            if (nSelected == 0 || (nSelected > 1 && !fMultiSelect)) {
                return new StatusInfo(IStatus.ERROR, ""); //$NON-NLS-1$
            }

            for (int i = 0; i < selection.length; i++) {
                Object curr = selection[i];

                if (curr instanceof File) {
                    File file = (File) curr;

                    if (!fAcceptFolders && !file.isFile()) {
                        return new StatusInfo(IStatus.ERROR, ""); //$NON-NLS-1$
                    }
                }
            }

            return new StatusInfo();
        }
    }

    protected static class FileViewerComparator extends ViewerComparator {
        public int category(Object element) {
            if (element instanceof File) {
                if (((File) element).isFile()) {
                    return 1;
                }
            }

            return 0;
        }
    }

    public ExternalFileSelectionDialog(Shell parent, ViewerFilter filter, boolean multiSelect,
            boolean acceptFolders) {
        super(parent, new FileLabelProvider(), new FileContentProvider(), true);

        setComparator(new FileViewerComparator());

        addFilter(filter);

        setValidator(new FileSelectionValidator(multiSelect, acceptFolders));

        setHelpAvailable(false);
    }

    @Override
    protected TreeViewer doCreateTreeViewer(Composite parent, int style) {
        TreeViewer viewer = super.doCreateTreeViewer(parent, style);

        viewer.setAutoExpandLevel(5);

        return viewer;
    }

}