/*******************************************************************************
 * Copyright (c) 2000, 2005 IBM Corporation 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/

package org.eclipse.ui.views.bookmarkexplorer;

import org.eclipse.core.resources.IMarker;
import org.eclipse.core.runtime.IPath;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.jface.viewers.ITableLabelProvider;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.osgi.util.NLS;
import org.eclipse.swt.graphics.Image;
import org.eclipse.ui.internal.ide.IDEWorkbenchPlugin;
import org.eclipse.ui.internal.views.bookmarkexplorer.BookmarkMessages;

/**
 * Provides labels for the bookmark navigator table
 */
class BookmarkLabelProvider extends LabelProvider implements
        ITableLabelProvider {

    private Image image;
    private ImageDescriptor desc;

    final static int COLUMN_ICON = 0;

    final static int COLUMN_DESCRIPTION = 1;

    final static int COLUMN_RESOURCE = 2;

    final static int COLUMN_FOLDER = 3;

    final static int COLUMN_LOCATION = 4;

    public BookmarkLabelProvider(BookmarkNavigator view) {
        desc = IDEWorkbenchPlugin.getIDEImageDescriptor("obj16/bkmrk_tsk.gif"); //$NON-NLS-1$
        image = JFaceResources.getResources().createImageWithDefault(desc);
    }

    /* (non-Javadoc)
     * Method declared on LabelProvider.
     */
    public void dispose() {
        if (image != null) {
            JFaceResources.getResources().destroyImage(desc);
            image = null;
        }
    }

    /* (non-Javadoc)
     * Method declared on LabelProvider.
     */
    public Image getImage(Object element) {
        return image;
    }

    public String getColumnText(Object element, int columnIndex) {
        if (!(element instanceof IMarker))
            return ""; //$NON-NLS-1$
        IMarker marker = (IMarker) element;

        switch (columnIndex) {
        case COLUMN_DESCRIPTION:
            return marker.getAttribute(IMarker.MESSAGE, ""); //$NON-NLS-1$
        case COLUMN_RESOURCE:
            return marker.getResource().getName();
        case COLUMN_FOLDER:
            return getContainerName(marker);
        case COLUMN_LOCATION: {
            int line = marker.getAttribute(IMarker.LINE_NUMBER, -1);
            if (line == -1)
                return ""; //$NON-NLS-1$
            return NLS.bind(BookmarkMessages.LineIndicator_text, String.valueOf(line));
        }
        }
        return ""; //$NON-NLS-1$ 
    }

    public Image getColumnImage(Object element, int index) {
        if (index == COLUMN_ICON)
            return image;
        return null;
    }

    /**
     * Returns the container name if it is defined, or empty string if not.
     */
    public static String getContainerName(IMarker marker) {
        IPath path = marker.getResource().getFullPath();
        int n = path.segmentCount() - 1;
        // n is the number of segments in container, not path
        if (n <= 0)
            return ""; //$NON-NLS-1$
        int len = 0;
        for (int i = 0; i < n; ++i)
            len += path.segment(i).length();
        // account for /'s
        if (n > 1)
            len += n - 1;
        StringBuffer sb = new StringBuffer(len);
        for (int i = 0; i < n; ++i) {
            if (i != 0)
                sb.append('/');
            sb.append(path.segment(i));
        }
        return sb.toString();
    }
}